pnfsblock: add device operations
authorJim Rees <rees@umich.edu>
Sun, 31 Jul 2011 00:52:42 +0000 (20:52 -0400)
committerTrond Myklebust <Trond.Myklebust@netapp.com>
Sun, 31 Jul 2011 16:18:16 +0000 (12:18 -0400)
Signed-off-by: Jim Rees <rees@umich.edu>
Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Benny Halevy <bhalevy@tonian.com>
[upcall bugfixes]
Signed-off-by: Peng Tao <peng_tao@emc.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
fs/nfs/blocklayout/Makefile
fs/nfs/blocklayout/blocklayout.c
fs/nfs/blocklayout/blocklayout.h
fs/nfs/blocklayout/blocklayoutdev.c [new file with mode: 0644]
fs/nfs/client.c
include/linux/nfs.h

index 5cfadf6ebc90d64c95c658b6413b4c7be5b17ca5..5bf3409084d2021c32ce0f73f5fc666fb85ab208 100644 (file)
@@ -2,4 +2,4 @@
 # Makefile for the pNFS block layout driver kernel module
 #
 obj-$(CONFIG_PNFS_BLOCK) += blocklayoutdriver.o
-blocklayoutdriver-objs := blocklayout.o extents.o
+blocklayoutdriver-objs := blocklayout.o extents.o blocklayoutdev.o
index 8dde3723482ed4cd09fffdf707970ddec9f1f5b7..c83878441047ff6572d83d31a2a4674a2c1afea6 100644 (file)
@@ -31,6 +31,8 @@
  */
 #include <linux/module.h>
 #include <linux/init.h>
+#include <linux/mount.h>
+#include <linux/namei.h>
 
 #include "blocklayout.h"
 
@@ -40,6 +42,9 @@ MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Andy Adamson <andros@citi.umich.edu>");
 MODULE_DESCRIPTION("The NFSv4.1 pNFS Block layout driver");
 
+struct dentry *bl_device_pipe;
+wait_queue_head_t bl_wq;
+
 static enum pnfs_try_status
 bl_read_pagelist(struct nfs_read_data *rdata)
 {
@@ -176,13 +181,49 @@ static struct pnfs_layoutdriver_type blocklayout_type = {
        .pg_write_ops                   = &bl_pg_write_ops,
 };
 
+static const struct rpc_pipe_ops bl_upcall_ops = {
+       .upcall         = bl_pipe_upcall,
+       .downcall       = bl_pipe_downcall,
+       .destroy_msg    = bl_pipe_destroy_msg,
+};
+
 static int __init nfs4blocklayout_init(void)
 {
+       struct vfsmount *mnt;
+       struct path path;
        int ret;
 
        dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__);
 
        ret = pnfs_register_layoutdriver(&blocklayout_type);
+       if (ret)
+               goto out;
+
+       init_waitqueue_head(&bl_wq);
+
+       mnt = rpc_get_mount();
+       if (IS_ERR(mnt)) {
+               ret = PTR_ERR(mnt);
+               goto out_remove;
+       }
+
+       ret = vfs_path_lookup(mnt->mnt_root,
+                             mnt,
+                             NFS_PIPE_DIRNAME, 0, &path);
+       if (ret)
+               goto out_remove;
+
+       bl_device_pipe = rpc_mkpipe(path.dentry, "blocklayout", NULL,
+                                   &bl_upcall_ops, 0);
+       if (IS_ERR(bl_device_pipe)) {
+               ret = PTR_ERR(bl_device_pipe);
+               goto out_remove;
+       }
+out:
+       return ret;
+
+out_remove:
+       pnfs_unregister_layoutdriver(&blocklayout_type);
        return ret;
 }
 
@@ -192,6 +233,7 @@ static void __exit nfs4blocklayout_exit(void)
               __func__);
 
        pnfs_unregister_layoutdriver(&blocklayout_type);
+       rpc_unlink(bl_device_pipe);
 }
 
 MODULE_ALIAS("nfs-layouttype4-3");
index 98e2f60c21431041697d80c674e3797b5e6445a7..dd25f1b3fe1ec21a4903a078ed2de7aaa5f7f5e7 100644 (file)
 
 #include <linux/device-mapper.h>
 #include <linux/nfs_fs.h>
+#include <linux/sunrpc/rpc_pipe_fs.h>
+
 #include "../pnfs.h"
 
+struct pnfs_block_dev {
+       struct list_head                bm_node;
+       struct nfs4_deviceid            bm_mdevid;    /* associated devid */
+       struct block_device             *bm_mdev;     /* meta device itself */
+};
+
 enum exstate4 {
        PNFS_BLOCK_READWRITE_DATA       = 0,
        PNFS_BLOCK_READ_DATA            = 1,
@@ -88,5 +96,37 @@ static inline struct pnfs_block_layout *BLK_LO2EXT(struct pnfs_layout_hdr *lo)
        return container_of(lo, struct pnfs_block_layout, bl_layout);
 }
 
+struct bl_dev_msg {
+       int status;
+       uint32_t major, minor;
+};
+
+struct bl_msg_hdr {
+       u8  type;
+       u16 totallen; /* length of entire message, including hdr itself */
+};
+
+extern struct dentry *bl_device_pipe;
+extern wait_queue_head_t bl_wq;
+
+#define BL_DEVICE_UMOUNT               0x0 /* Umount--delete devices */
+#define BL_DEVICE_MOUNT                0x1 /* Mount--create devices*/
+#define BL_DEVICE_REQUEST_INIT         0x0 /* Start request */
+#define BL_DEVICE_REQUEST_PROC         0x1 /* User level process succeeds */
+#define BL_DEVICE_REQUEST_ERR          0x2 /* User level process fails */
+
+/* blocklayoutdev.c */
+ssize_t bl_pipe_upcall(struct file *, struct rpc_pipe_msg *,
+                      char __user *, size_t);
+ssize_t bl_pipe_downcall(struct file *, const char __user *, size_t);
+void bl_pipe_destroy_msg(struct rpc_pipe_msg *);
+struct block_device *nfs4_blkdev_get(dev_t dev);
+int nfs4_blkdev_put(struct block_device *bdev);
+struct pnfs_block_dev *nfs4_blk_decode_device(struct nfs_server *server,
+                                               struct pnfs_device *dev,
+                                               struct list_head *sdlist);
+int nfs4_blk_process_layoutget(struct pnfs_layout_hdr *lo,
+                               struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
+
 void bl_put_extent(struct pnfs_block_extent *be);
 #endif /* FS_NFS_NFS4BLOCKLAYOUT_H */
diff --git a/fs/nfs/blocklayout/blocklayoutdev.c b/fs/nfs/blocklayout/blocklayoutdev.c
new file mode 100644 (file)
index 0000000..7e1377f
--- /dev/null
@@ -0,0 +1,191 @@
+/*
+ *  linux/fs/nfs/blocklayout/blocklayoutdev.c
+ *
+ *  Device operations for the pnfs nfs4 file layout driver.
+ *
+ *  Copyright (c) 2006 The Regents of the University of Michigan.
+ *  All rights reserved.
+ *
+ *  Andy Adamson <andros@citi.umich.edu>
+ *  Fred Isaman <iisaman@umich.edu>
+ *
+ * permission is granted to use, copy, create derivative works and
+ * redistribute this software and such derivative works for any purpose,
+ * so long as the name of the university of michigan is not used in
+ * any advertising or publicity pertaining to the use or distribution
+ * of this software without specific, written prior authorization.  if
+ * the above copyright notice or any other identification of the
+ * university of michigan is included in any copy of any portion of
+ * this software, then the disclaimer below must also be included.
+ *
+ * this software is provided as is, without representation from the
+ * university of michigan as to its fitness for any purpose, and without
+ * warranty by the university of michigan of any kind, either express
+ * or implied, including without limitation the implied warranties of
+ * merchantability and fitness for a particular purpose.  the regents
+ * of the university of michigan shall not be liable for any damages,
+ * including special, indirect, incidental, or consequential damages,
+ * with respect to any claim arising out or in connection with the use
+ * of the software, even if it has been or is hereafter advised of the
+ * possibility of such damages.
+ */
+#include <linux/module.h>
+#include <linux/buffer_head.h> /* __bread */
+
+#include <linux/genhd.h>
+#include <linux/blkdev.h>
+#include <linux/hash.h>
+
+#include "blocklayout.h"
+
+#define NFSDBG_FACILITY         NFSDBG_PNFS_LD
+
+/* Open a block_device by device number. */
+struct block_device *nfs4_blkdev_get(dev_t dev)
+{
+       struct block_device *bd;
+
+       dprintk("%s enter\n", __func__);
+       bd = blkdev_get_by_dev(dev, FMODE_READ, NULL);
+       if (IS_ERR(bd))
+               goto fail;
+       return bd;
+fail:
+       dprintk("%s failed to open device : %ld\n",
+                       __func__, PTR_ERR(bd));
+       return NULL;
+}
+
+/*
+ * Release the block device
+ */
+int nfs4_blkdev_put(struct block_device *bdev)
+{
+       dprintk("%s for device %d:%d\n", __func__, MAJOR(bdev->bd_dev),
+                       MINOR(bdev->bd_dev));
+       return blkdev_put(bdev, FMODE_READ);
+}
+
+/*
+ * Shouldn't there be a rpc_generic_upcall() to do this for us?
+ */
+ssize_t bl_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg,
+                      char __user *dst, size_t buflen)
+{
+       char *data = (char *)msg->data + msg->copied;
+       size_t mlen = min(msg->len - msg->copied, buflen);
+       unsigned long left;
+
+       left = copy_to_user(dst, data, mlen);
+       if (left == mlen) {
+               msg->errno = -EFAULT;
+               return -EFAULT;
+       }
+
+       mlen -= left;
+       msg->copied += mlen;
+       msg->errno = 0;
+       return mlen;
+}
+
+static struct bl_dev_msg bl_mount_reply;
+
+ssize_t bl_pipe_downcall(struct file *filp, const char __user *src,
+                        size_t mlen)
+{
+       if (mlen != sizeof (struct bl_dev_msg))
+               return -EINVAL;
+
+       if (copy_from_user(&bl_mount_reply, src, mlen) != 0)
+               return -EFAULT;
+
+       wake_up(&bl_wq);
+
+       return mlen;
+}
+
+void bl_pipe_destroy_msg(struct rpc_pipe_msg *msg)
+{
+       if (msg->errno >= 0)
+               return;
+       wake_up(&bl_wq);
+}
+
+/*
+ * Decodes pnfs_block_deviceaddr4 which is XDR encoded in dev->dev_addr_buf.
+ */
+struct pnfs_block_dev *
+nfs4_blk_decode_device(struct nfs_server *server,
+                      struct pnfs_device *dev,
+                      struct list_head *sdlist)
+{
+       struct pnfs_block_dev *rv = NULL;
+       struct block_device *bd = NULL;
+       struct rpc_pipe_msg msg;
+       struct bl_msg_hdr bl_msg = {
+               .type = BL_DEVICE_MOUNT,
+               .totallen = dev->mincount,
+       };
+       uint8_t *dataptr;
+       DECLARE_WAITQUEUE(wq, current);
+       struct bl_dev_msg *reply = &bl_mount_reply;
+
+       dprintk("%s CREATING PIPEFS MESSAGE\n", __func__);
+       dprintk("%s: deviceid: %s, mincount: %d\n", __func__, dev->dev_id.data,
+               dev->mincount);
+
+       memset(&msg, 0, sizeof(msg));
+       msg.data = kzalloc(sizeof(bl_msg) + dev->mincount, GFP_NOFS);
+       if (!msg.data) {
+               rv = ERR_PTR(-ENOMEM);
+               goto out;
+       }
+
+       memcpy(msg.data, &bl_msg, sizeof(bl_msg));
+       dataptr = (uint8_t *) msg.data;
+       memcpy(&dataptr[sizeof(bl_msg)], dev->area, dev->mincount);
+       msg.len = sizeof(bl_msg) + dev->mincount;
+
+       dprintk("%s CALLING USERSPACE DAEMON\n", __func__);
+       add_wait_queue(&bl_wq, &wq);
+       if (rpc_queue_upcall(bl_device_pipe->d_inode, &msg) < 0) {
+               remove_wait_queue(&bl_wq, &wq);
+               goto out;
+       }
+
+       set_current_state(TASK_UNINTERRUPTIBLE);
+       schedule();
+       __set_current_state(TASK_RUNNING);
+       remove_wait_queue(&bl_wq, &wq);
+
+       if (reply->status != BL_DEVICE_REQUEST_PROC) {
+               dprintk("%s failed to open device: %d\n",
+                       __func__, reply->status);
+               rv = ERR_PTR(-EINVAL);
+               goto out;
+       }
+
+       bd = nfs4_blkdev_get(MKDEV(reply->major, reply->minor));
+       if (IS_ERR(bd)) {
+               dprintk("%s failed to open device : %ld\n",
+                       __func__, PTR_ERR(bd));
+               goto out;
+       }
+
+       rv = kzalloc(sizeof(*rv), GFP_NOFS);
+       if (!rv) {
+               rv = ERR_PTR(-ENOMEM);
+               goto out;
+       }
+
+       rv->bm_mdev = bd;
+       memcpy(&rv->bm_mdevid, &dev->dev_id, sizeof(struct nfs4_deviceid));
+       dprintk("%s Created device %s with bd_block_size %u\n",
+               __func__,
+               bd->bd_disk->disk_name,
+               bd->bd_block_size);
+
+out:
+       kfree(msg.data);
+       return rv;
+}
index de00a373f085ea83a8a902c54e173365e8f92637..5833fbbf59b05532638cedc7aea694c137b4e534 100644 (file)
@@ -105,7 +105,7 @@ struct rpc_program nfs_program = {
        .nrvers                 = ARRAY_SIZE(nfs_version),
        .version                = nfs_version,
        .stats                  = &nfs_rpcstat,
-       .pipe_dir_name          = "/nfs",
+       .pipe_dir_name          = NFS_PIPE_DIRNAME,
 };
 
 struct rpc_stat nfs_rpcstat = {
index f387919bbc59777fcdf5b246458472054407dc71..8c6ee44914cb4c7dc464167a2163625ac6c6f8f8 100644 (file)
@@ -29,6 +29,8 @@
 #define NFS_MNT_VERSION                1
 #define NFS_MNT3_VERSION       3
 
+#define NFS_PIPE_DIRNAME "/nfs"
+
 /*
  * NFS stats. The good thing with these values is that NFSv3 errors are
  * a superset of NFSv2 errors (with the exception of NFSERR_WFLUSH which