ceph: ioctls
A few Ceph ioctls for getting and setting file layout (striping) parameters, and learning the identity and network address of the OSD a given region of a file is stored on. Signed-off-by: Sage Weil <sage@newdream.net>
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Sage Weil
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8f4e91dee2
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@ -182,6 +182,7 @@ Code Seq# Include File Comments
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<http://www.proximity.com.au/~brian/winradio/>
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0x90 00 drivers/cdrom/sbpcd.h
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0x93 60-7F linux/auto_fs.h
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0x97 00-7F fs/ceph/ioctl.h Ceph file system
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0x99 00-0F 537-Addinboard driver
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<mailto:buk@buks.ipn.de>
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0xA0 all linux/sdp/sdp.h Industrial Device Project
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@ -0,0 +1,157 @@
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#include <linux/in.h>
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#include "ioctl.h"
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#include "super.h"
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#include "ceph_debug.h"
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/*
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* ioctls
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*/
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/*
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* get and set the file layout
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*/
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static long ceph_ioctl_get_layout(struct file *file, void __user *arg)
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{
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struct ceph_inode_info *ci = ceph_inode(file->f_dentry->d_inode);
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struct ceph_ioctl_layout l;
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int err;
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err = ceph_do_getattr(file->f_dentry->d_inode, CEPH_STAT_CAP_LAYOUT);
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if (!err) {
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l.stripe_unit = ceph_file_layout_su(ci->i_layout);
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l.stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
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l.object_size = ceph_file_layout_object_size(ci->i_layout);
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l.data_pool = le32_to_cpu(ci->i_layout.fl_pg_pool);
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if (copy_to_user(arg, &l, sizeof(l)))
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return -EFAULT;
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}
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return err;
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}
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static long ceph_ioctl_set_layout(struct file *file, void __user *arg)
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{
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struct inode *inode = file->f_dentry->d_inode;
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struct inode *parent_inode = file->f_dentry->d_parent->d_inode;
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struct ceph_mds_client *mdsc = &ceph_sb_to_client(inode->i_sb)->mdsc;
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struct ceph_mds_request *req;
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struct ceph_ioctl_layout l;
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int err, i;
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/* copy and validate */
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if (copy_from_user(&l, arg, sizeof(l)))
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return -EFAULT;
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if ((l.object_size & ~PAGE_MASK) ||
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(l.stripe_unit & ~PAGE_MASK) ||
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!l.stripe_unit ||
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(l.object_size &&
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(unsigned)l.object_size % (unsigned)l.stripe_unit))
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return -EINVAL;
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/* make sure it's a valid data pool */
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if (l.data_pool > 0) {
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mutex_lock(&mdsc->mutex);
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err = -EINVAL;
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for (i = 0; i < mdsc->mdsmap->m_num_data_pg_pools; i++)
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if (mdsc->mdsmap->m_data_pg_pools[i] == l.data_pool) {
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err = 0;
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break;
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}
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mutex_unlock(&mdsc->mutex);
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if (err)
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return err;
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}
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req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETLAYOUT,
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USE_AUTH_MDS);
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if (IS_ERR(req))
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return PTR_ERR(req);
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req->r_inode = igrab(inode);
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req->r_inode_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL;
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req->r_args.setlayout.layout.fl_stripe_unit =
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cpu_to_le32(l.stripe_unit);
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req->r_args.setlayout.layout.fl_stripe_count =
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cpu_to_le32(l.stripe_count);
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req->r_args.setlayout.layout.fl_object_size =
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cpu_to_le32(l.object_size);
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req->r_args.setlayout.layout.fl_pg_pool = cpu_to_le32(l.data_pool);
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req->r_args.setlayout.layout.fl_pg_preferred = cpu_to_le32((s32)-1);
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err = ceph_mdsc_do_request(mdsc, parent_inode, req);
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ceph_mdsc_put_request(req);
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return err;
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}
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/*
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* Return object name, size/offset information, and location (OSD
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* number, network address) for a given file offset.
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*/
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static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
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{
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struct ceph_ioctl_dataloc dl;
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struct inode *inode = file->f_dentry->d_inode;
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struct ceph_inode_info *ci = ceph_inode(inode);
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struct ceph_osd_client *osdc = &ceph_client(inode->i_sb)->osdc;
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u64 len = 1, olen;
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u64 tmp;
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struct ceph_object_layout ol;
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union ceph_pg pgid;
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/* copy and validate */
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if (copy_from_user(&dl, arg, sizeof(dl)))
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return -EFAULT;
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down_read(&osdc->map_sem);
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ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, &len,
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&dl.object_no, &dl.object_offset, &olen);
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dl.file_offset -= dl.object_offset;
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dl.object_size = ceph_file_layout_object_size(ci->i_layout);
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dl.block_size = ceph_file_layout_su(ci->i_layout);
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/* block_offset = object_offset % block_size */
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tmp = dl.object_offset;
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dl.block_offset = do_div(tmp, dl.block_size);
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snprintf(dl.object_name, sizeof(dl.object_name), "%llx.%08llx",
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ceph_ino(inode), dl.object_no);
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ceph_calc_object_layout(&ol, dl.object_name, &ci->i_layout,
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osdc->osdmap);
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pgid.pg64 = le64_to_cpu(ol.ol_pgid);
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dl.osd = ceph_calc_pg_primary(osdc->osdmap, pgid);
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if (dl.osd >= 0) {
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struct ceph_entity_addr *a =
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ceph_osd_addr(osdc->osdmap, dl.osd);
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if (a)
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memcpy(&dl.osd_addr, &a->in_addr, sizeof(dl.osd_addr));
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} else {
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memset(&dl.osd_addr, 0, sizeof(dl.osd_addr));
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}
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up_read(&osdc->map_sem);
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/* send result back to user */
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if (copy_to_user(arg, &dl, sizeof(dl)))
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return -EFAULT;
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return 0;
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}
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long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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dout("ioctl file %p cmd %u arg %lu\n", file, cmd, arg);
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switch (cmd) {
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case CEPH_IOC_GET_LAYOUT:
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return ceph_ioctl_get_layout(file, (void __user *)arg);
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case CEPH_IOC_SET_LAYOUT:
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return ceph_ioctl_set_layout(file, (void __user *)arg);
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case CEPH_IOC_GET_DATALOC:
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return ceph_ioctl_get_dataloc(file, (void __user *)arg);
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}
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return -ENOTTY;
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}
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@ -0,0 +1,39 @@
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#ifndef FS_CEPH_IOCTL_H
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#define FS_CEPH_IOCTL_H
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#include <linux/ioctl.h>
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#include <linux/types.h>
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#define CEPH_IOCTL_MAGIC 0x97
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/* just use u64 to align sanely on all archs */
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struct ceph_ioctl_layout {
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__u64 stripe_unit, stripe_count, object_size;
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__u64 data_pool;
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};
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#define CEPH_IOC_GET_LAYOUT _IOR(CEPH_IOCTL_MAGIC, 1, \
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struct ceph_ioctl_layout)
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#define CEPH_IOC_SET_LAYOUT _IOW(CEPH_IOCTL_MAGIC, 2, \
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struct ceph_ioctl_layout)
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/*
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* Extract identity, address of the OSD and object storing a given
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* file offset.
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*/
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struct ceph_ioctl_dataloc {
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__u64 file_offset; /* in+out: file offset */
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__u64 object_offset; /* out: offset in object */
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__u64 object_no; /* out: object # */
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__u64 object_size; /* out: object size */
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char object_name[64]; /* out: object name */
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__u64 block_offset; /* out: offset in block */
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__u64 block_size; /* out: block length */
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__s64 osd; /* out: osd # */
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struct sockaddr_storage osd_addr; /* out: osd address */
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};
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#define CEPH_IOC_GET_DATALOC _IOWR(CEPH_IOCTL_MAGIC, 3, \
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struct ceph_ioctl_dataloc)
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#endif
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