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>
diff --git a/fs/ceph/ioctl.c b/fs/ceph/ioctl.c
new file mode 100644
index 0000000..e4f99ef
--- /dev/null
+++ b/fs/ceph/ioctl.c
@@ -0,0 +1,157 @@
+#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;
+}