ceph: ioctls

A few Ceph ioctls for getting and setting file layout (striping)
parameters.

Signed-off-by: Sage Weil <sage@newdream.net>

diff --git a/fs/ceph/ioctl.c b/fs/ceph/ioctl.c
new file mode 100644 (file)
index 0000000..bf5a9d9
--- /dev/null
+++ b/fs/ceph/ioctl.c
@@ -0,0 +1,98 @@
+#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;
+}
+
+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);
+       }
+       return -ENOTTY;
+}

diff --git a/fs/ceph/ioctl.h b/fs/ceph/ioctl.h
new file mode 100644 (file)
index 0000000..56f5e2c
--- /dev/null
+++ b/fs/ceph/ioctl.h
@@ -0,0 +1,20 @@
+#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)
+
+#endif