ceph: ioctls

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

diff --git a/fs/ceph/ioctl.c b/fs/ceph/ioctl.c
new file mode 100644 (file)
index 0000000..ccbd0d6
--- /dev/null
+++ b/fs/ceph/ioctl.c
@@ -0,0 +1,72 @@
+#include "ioctl.h"
+#include "super.h"
+#include "ceph_debug.h"
+
+int ceph_debug_ioctl = -1;
+#define DOUT_MASK DOUT_MASK_IOCTL
+#define DOUT_VAR ceph_debug_ioctl
+#define DOUT_PREFIX "ioctl: "
+
+
+/*
+ * ioctls
+ */
+
+static long ceph_ioctl_get_layout(struct file *file, void __user *arg)
+{
+       struct ceph_inode_info *ci = ceph_inode(file->f_dentry->d_inode);
+       int err;
+
+       err = ceph_do_getattr(file->f_dentry, CEPH_STAT_MASK_LAYOUT);
+       if (!err) {
+               if (copy_to_user(arg, &ci->i_layout, sizeof(ci->i_layout)))
+                       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 ceph_mds_client *mdsc = &ceph_sb_to_client(inode->i_sb)->mdsc;
+       char *path;
+       int pathlen;
+       struct ceph_mds_request *req;
+       struct ceph_mds_request_head *reqh;
+       u64 pathbase;
+       struct ceph_file_layout layout;
+       int err;
+
+       /* copy and validate */
+       if (copy_from_user(&layout, arg, sizeof(layout)))
+               return -EFAULT;
+
+       /* set */
+       path = ceph_build_path(file->f_dentry, &pathlen, &pathbase, 0);
+       if (IS_ERR(path))
+               return PTR_ERR(path);
+       req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LSETLAYOUT,
+                                      pathbase, path, 0, NULL,
+                                      file->f_dentry, USE_ANY_MDS);
+       kfree(path);
+       reqh = req->r_request->front.iov_base;
+       reqh->args.setlayout.layout = layout;
+       ceph_mdsc_lease_release(mdsc, inode, NULL, CEPH_LOCK_ICONTENT);
+       err = ceph_mdsc_do_request(mdsc, req);
+       ceph_mdsc_put_request(req);
+       return err;
+}
+
+long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+       dout(10, "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..537c27b
--- /dev/null
+++ b/fs/ceph/ioctl.h
@@ -0,0 +1,12 @@
+#ifndef FS_CEPH_IOCTL_H
+#define FS_CEPH_IOCTL_H
+
+#include <linux/ioctl.h>
+#include "types.h"
+
+#define CEPH_IOCTL_MAGIC 0x97
+
+#define CEPH_IOC_GET_LAYOUT _IOR(CEPH_IOCTL_MAGIC, 1, struct ceph_file_layout)
+#define CEPH_IOC_SET_LAYOUT _IOW(CEPH_IOCTL_MAGIC, 2, struct ceph_file_layout)
+
+#endif