# Makefile for the pNFS block layout driver kernel module
#
obj-$(CONFIG_PNFS_BLOCK) += blocklayoutdriver.o
-blocklayoutdriver-objs := blocklayout.o blocklayoutdev.o blocklayoutdm.o \
- extent_tree.o
+
+blocklayoutdriver-y += blocklayout.o extent_tree.o rpc_pipefs.o
.pg_write_ops = &bl_pg_write_ops,
};
-static const struct rpc_pipe_ops bl_upcall_ops = {
- .upcall = rpc_pipe_generic_upcall,
- .downcall = bl_pipe_downcall,
- .destroy_msg = bl_pipe_destroy_msg,
-};
-
-static struct dentry *nfs4blocklayout_register_sb(struct super_block *sb,
- struct rpc_pipe *pipe)
-{
- struct dentry *dir, *dentry;
-
- dir = rpc_d_lookup_sb(sb, NFS_PIPE_DIRNAME);
- if (dir == NULL)
- return ERR_PTR(-ENOENT);
- dentry = rpc_mkpipe_dentry(dir, "blocklayout", NULL, pipe);
- dput(dir);
- return dentry;
-}
-
-static void nfs4blocklayout_unregister_sb(struct super_block *sb,
- struct rpc_pipe *pipe)
-{
- if (pipe->dentry)
- rpc_unlink(pipe->dentry);
-}
-
-static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
- void *ptr)
-{
- struct super_block *sb = ptr;
- struct net *net = sb->s_fs_info;
- struct nfs_net *nn = net_generic(net, nfs_net_id);
- struct dentry *dentry;
- int ret = 0;
-
- if (!try_module_get(THIS_MODULE))
- return 0;
-
- if (nn->bl_device_pipe == NULL) {
- module_put(THIS_MODULE);
- return 0;
- }
-
- switch (event) {
- case RPC_PIPEFS_MOUNT:
- dentry = nfs4blocklayout_register_sb(sb, nn->bl_device_pipe);
- if (IS_ERR(dentry)) {
- ret = PTR_ERR(dentry);
- break;
- }
- nn->bl_device_pipe->dentry = dentry;
- break;
- case RPC_PIPEFS_UMOUNT:
- if (nn->bl_device_pipe->dentry)
- nfs4blocklayout_unregister_sb(sb, nn->bl_device_pipe);
- break;
- default:
- ret = -ENOTSUPP;
- break;
- }
- module_put(THIS_MODULE);
- return ret;
-}
-
-static struct notifier_block nfs4blocklayout_block = {
- .notifier_call = rpc_pipefs_event,
-};
-
-static struct dentry *nfs4blocklayout_register_net(struct net *net,
- struct rpc_pipe *pipe)
-{
- struct super_block *pipefs_sb;
- struct dentry *dentry;
-
- pipefs_sb = rpc_get_sb_net(net);
- if (!pipefs_sb)
- return NULL;
- dentry = nfs4blocklayout_register_sb(pipefs_sb, pipe);
- rpc_put_sb_net(net);
- return dentry;
-}
-
-static void nfs4blocklayout_unregister_net(struct net *net,
- struct rpc_pipe *pipe)
-{
- struct super_block *pipefs_sb;
-
- pipefs_sb = rpc_get_sb_net(net);
- if (pipefs_sb) {
- nfs4blocklayout_unregister_sb(pipefs_sb, pipe);
- rpc_put_sb_net(net);
- }
-}
-
-static int nfs4blocklayout_net_init(struct net *net)
-{
- struct nfs_net *nn = net_generic(net, nfs_net_id);
- struct dentry *dentry;
-
- init_waitqueue_head(&nn->bl_wq);
- nn->bl_device_pipe = rpc_mkpipe_data(&bl_upcall_ops, 0);
- if (IS_ERR(nn->bl_device_pipe))
- return PTR_ERR(nn->bl_device_pipe);
- dentry = nfs4blocklayout_register_net(net, nn->bl_device_pipe);
- if (IS_ERR(dentry)) {
- rpc_destroy_pipe_data(nn->bl_device_pipe);
- return PTR_ERR(dentry);
- }
- nn->bl_device_pipe->dentry = dentry;
- return 0;
-}
-
-static void nfs4blocklayout_net_exit(struct net *net)
-{
- struct nfs_net *nn = net_generic(net, nfs_net_id);
-
- nfs4blocklayout_unregister_net(net, nn->bl_device_pipe);
- rpc_destroy_pipe_data(nn->bl_device_pipe);
- nn->bl_device_pipe = NULL;
-}
-
-static struct pernet_operations nfs4blocklayout_net_ops = {
- .init = nfs4blocklayout_net_init,
- .exit = nfs4blocklayout_net_exit,
-};
-
static int __init nfs4blocklayout_init(void)
{
int ret;
ret = pnfs_register_layoutdriver(&blocklayout_type);
if (ret)
goto out;
-
- ret = rpc_pipefs_notifier_register(&nfs4blocklayout_block);
- if (ret)
- goto out_remove;
- ret = register_pernet_subsys(&nfs4blocklayout_net_ops);
+ ret = bl_init_pipefs();
if (ret)
- goto out_notifier;
-out:
- return ret;
+ goto out_unregister;
+ return 0;
-out_notifier:
- rpc_pipefs_notifier_unregister(&nfs4blocklayout_block);
-out_remove:
+out_unregister:
pnfs_unregister_layoutdriver(&blocklayout_type);
+out:
return ret;
}
dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n",
__func__);
- rpc_pipefs_notifier_unregister(&nfs4blocklayout_block);
- unregister_pernet_subsys(&nfs4blocklayout_net_ops);
+ bl_cleanup_pipefs();
pnfs_unregister_layoutdriver(&blocklayout_type);
}
#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_downcall(struct file *, const char __user *, size_t);
-void bl_pipe_destroy_msg(struct rpc_pipe_msg *);
-
-struct nfs4_deviceid_node *bl_alloc_deviceid_node(struct nfs_server *server,
- struct pnfs_device *pdev, gfp_t gfp_mask);
-void bl_free_deviceid_node(struct nfs4_deviceid_node *d);
-
-/* blocklayoutdm.c */
-void bl_dm_remove(struct net *net, dev_t dev);
-
/* extent_tree.c */
int ext_tree_insert(struct pnfs_block_layout *bl,
struct pnfs_block_extent *new);
int ext_tree_prepare_commit(struct nfs4_layoutcommit_args *arg);
void ext_tree_mark_committed(struct nfs4_layoutcommit_args *arg, int status);
+/* rpc_pipefs.c */
+struct nfs4_deviceid_node *bl_alloc_deviceid_node(struct nfs_server *server,
+ struct pnfs_device *pdev, gfp_t gfp_mask);
+void bl_free_deviceid_node(struct nfs4_deviceid_node *d);
+
+int __init bl_init_pipefs(void);
+void __exit bl_cleanup_pipefs(void);
+
#endif /* FS_NFS_NFS4BLOCKLAYOUT_H */
+++ /dev/null
-/*
- * 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
-
-ssize_t bl_pipe_downcall(struct file *filp, const char __user *src,
- size_t mlen)
-{
- struct nfs_net *nn = net_generic(filp->f_dentry->d_sb->s_fs_info,
- nfs_net_id);
-
- if (mlen != sizeof (struct bl_dev_msg))
- return -EINVAL;
-
- if (copy_from_user(&nn->bl_mount_reply, src, mlen) != 0)
- return -EFAULT;
-
- wake_up(&nn->bl_wq);
-
- return mlen;
-}
-
-void bl_pipe_destroy_msg(struct rpc_pipe_msg *msg)
-{
- struct bl_pipe_msg *bl_pipe_msg = container_of(msg, struct bl_pipe_msg, msg);
-
- if (msg->errno >= 0)
- return;
- wake_up(bl_pipe_msg->bl_wq);
-}
-
-/*
- * Decodes pnfs_block_deviceaddr4 which is XDR encoded in dev->dev_addr_buf.
- */
-struct nfs4_deviceid_node *
-bl_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *dev,
- gfp_t gfp_mask)
-{
- struct pnfs_block_dev *rv;
- struct block_device *bd;
- struct bl_pipe_msg bl_pipe_msg;
- struct rpc_pipe_msg *msg = &bl_pipe_msg.msg;
- struct bl_msg_hdr bl_msg = {
- .type = BL_DEVICE_MOUNT,
- .totallen = dev->mincount,
- };
- uint8_t *dataptr;
- DECLARE_WAITQUEUE(wq, current);
- int offset, len, i, rc;
- struct net *net = server->nfs_client->cl_net;
- struct nfs_net *nn = net_generic(net, nfs_net_id);
- struct bl_dev_msg *reply = &nn->bl_mount_reply;
-
- dprintk("%s CREATING PIPEFS MESSAGE\n", __func__);
- dprintk("%s: deviceid: %s, mincount: %d\n", __func__, dev->dev_id.data,
- dev->mincount);
-
- bl_pipe_msg.bl_wq = &nn->bl_wq;
- memset(msg, 0, sizeof(*msg));
- msg->data = kzalloc(sizeof(bl_msg) + dev->mincount, gfp_mask);
- if (!msg->data)
- goto out;
-
- memcpy(msg->data, &bl_msg, sizeof(bl_msg));
- dataptr = (uint8_t *) msg->data;
- len = dev->mincount;
- offset = sizeof(bl_msg);
- for (i = 0; len > 0; i++) {
- memcpy(&dataptr[offset], page_address(dev->pages[i]),
- len < PAGE_CACHE_SIZE ? len : PAGE_CACHE_SIZE);
- len -= PAGE_CACHE_SIZE;
- offset += PAGE_CACHE_SIZE;
- }
- msg->len = sizeof(bl_msg) + dev->mincount;
-
- dprintk("%s CALLING USERSPACE DAEMON\n", __func__);
- add_wait_queue(&nn->bl_wq, &wq);
- rc = rpc_queue_upcall(nn->bl_device_pipe, msg);
- if (rc < 0) {
- remove_wait_queue(&nn->bl_wq, &wq);
- goto out;
- }
-
- set_current_state(TASK_UNINTERRUPTIBLE);
- schedule();
- __set_current_state(TASK_RUNNING);
- remove_wait_queue(&nn->bl_wq, &wq);
-
- if (reply->status != BL_DEVICE_REQUEST_PROC) {
- printk(KERN_WARNING "%s failed to decode device: %d\n",
- __func__, reply->status);
- goto out;
- }
-
- bd = blkdev_get_by_dev(MKDEV(reply->major, reply->minor),
- FMODE_READ, NULL);
- if (IS_ERR(bd)) {
- printk(KERN_WARNING "%s failed to open device %d:%d (%ld)\n",
- __func__, reply->major, reply->minor,
- PTR_ERR(bd));
- goto out;
- }
-
- rv = kzalloc(sizeof(*rv), gfp_mask);
- if (!rv)
- goto out;
-
- nfs4_init_deviceid_node(&rv->d_node, server, &dev->dev_id);
- rv->d_bdev = bd;
-
- dprintk("%s Created device %s with bd_block_size %u\n",
- __func__,
- bd->bd_disk->disk_name,
- bd->bd_block_size);
-
- kfree(msg->data);
- return &rv->d_node;
-
-out:
- kfree(msg->data);
- return NULL;
-}
-
-void
-bl_free_deviceid_node(struct nfs4_deviceid_node *d)
-{
- struct pnfs_block_dev *dev =
- container_of(d, struct pnfs_block_dev, d_node);
- struct net *net = d->nfs_client->cl_net;
-
- blkdev_put(dev->d_bdev, FMODE_READ);
- bl_dm_remove(net, dev->d_bdev->bd_dev);
-
- kfree(dev);
-}
+++ /dev/null
-/*
- * linux/fs/nfs/blocklayout/blocklayoutdm.c
- *
- * Module for the NFSv4.1 pNFS block layout driver.
- *
- * Copyright (c) 2007 The Regents of the University of Michigan.
- * All rights reserved.
- *
- * Fred Isaman <iisaman@umich.edu>
- * Andy Adamson <andros@citi.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/genhd.h> /* gendisk - used in a dprintk*/
-#include <linux/sched.h>
-#include <linux/hash.h>
-
-#include "blocklayout.h"
-
-#define NFSDBG_FACILITY NFSDBG_PNFS_LD
-
-void bl_dm_remove(struct net *net, dev_t dev)
-{
- struct bl_pipe_msg bl_pipe_msg;
- struct rpc_pipe_msg *msg = &bl_pipe_msg.msg;
- struct bl_dev_msg bl_umount_request;
- struct bl_msg_hdr bl_msg = {
- .type = BL_DEVICE_UMOUNT,
- .totallen = sizeof(bl_umount_request),
- };
- uint8_t *dataptr;
- DECLARE_WAITQUEUE(wq, current);
- struct nfs_net *nn = net_generic(net, nfs_net_id);
-
- dprintk("Entering %s\n", __func__);
-
- bl_pipe_msg.bl_wq = &nn->bl_wq;
- memset(msg, 0, sizeof(*msg));
- msg->len = sizeof(bl_msg) + bl_msg.totallen;
- msg->data = kzalloc(msg->len, GFP_NOFS);
- if (!msg->data)
- goto out;
-
- memset(&bl_umount_request, 0, sizeof(bl_umount_request));
- bl_umount_request.major = MAJOR(dev);
- bl_umount_request.minor = MINOR(dev);
-
- memcpy(msg->data, &bl_msg, sizeof(bl_msg));
- dataptr = (uint8_t *) msg->data;
- memcpy(&dataptr[sizeof(bl_msg)], &bl_umount_request, sizeof(bl_umount_request));
-
- add_wait_queue(&nn->bl_wq, &wq);
- if (rpc_queue_upcall(nn->bl_device_pipe, msg) < 0) {
- remove_wait_queue(&nn->bl_wq, &wq);
- goto out;
- }
-
- set_current_state(TASK_UNINTERRUPTIBLE);
- schedule();
- __set_current_state(TASK_RUNNING);
- remove_wait_queue(&nn->bl_wq, &wq);
-
-out:
- kfree(msg->data);
-}
--- /dev/null
+/*
+ * Copyright (c) 2006,2007 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/genhd.h>
+#include <linux/blkdev.h>
+
+#include "blocklayout.h"
+
+#define NFSDBG_FACILITY NFSDBG_PNFS_LD
+
+static void bl_dm_remove(struct net *net, dev_t dev)
+{
+ struct bl_pipe_msg bl_pipe_msg;
+ struct rpc_pipe_msg *msg = &bl_pipe_msg.msg;
+ struct bl_dev_msg bl_umount_request;
+ struct bl_msg_hdr bl_msg = {
+ .type = BL_DEVICE_UMOUNT,
+ .totallen = sizeof(bl_umount_request),
+ };
+ uint8_t *dataptr;
+ DECLARE_WAITQUEUE(wq, current);
+ struct nfs_net *nn = net_generic(net, nfs_net_id);
+
+ dprintk("Entering %s\n", __func__);
+
+ bl_pipe_msg.bl_wq = &nn->bl_wq;
+ memset(msg, 0, sizeof(*msg));
+ msg->len = sizeof(bl_msg) + bl_msg.totallen;
+ msg->data = kzalloc(msg->len, GFP_NOFS);
+ if (!msg->data)
+ goto out;
+
+ memset(&bl_umount_request, 0, sizeof(bl_umount_request));
+ bl_umount_request.major = MAJOR(dev);
+ bl_umount_request.minor = MINOR(dev);
+
+ memcpy(msg->data, &bl_msg, sizeof(bl_msg));
+ dataptr = (uint8_t *) msg->data;
+ memcpy(&dataptr[sizeof(bl_msg)], &bl_umount_request, sizeof(bl_umount_request));
+
+ add_wait_queue(&nn->bl_wq, &wq);
+ if (rpc_queue_upcall(nn->bl_device_pipe, msg) < 0) {
+ remove_wait_queue(&nn->bl_wq, &wq);
+ goto out;
+ }
+
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule();
+ __set_current_state(TASK_RUNNING);
+ remove_wait_queue(&nn->bl_wq, &wq);
+
+out:
+ kfree(msg->data);
+}
+
+/*
+ * Decodes pnfs_block_deviceaddr4 which is XDR encoded in dev->dev_addr_buf.
+ */
+struct nfs4_deviceid_node *
+bl_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *dev,
+ gfp_t gfp_mask)
+{
+ struct pnfs_block_dev *rv;
+ struct block_device *bd;
+ struct bl_pipe_msg bl_pipe_msg;
+ struct rpc_pipe_msg *msg = &bl_pipe_msg.msg;
+ struct bl_msg_hdr bl_msg = {
+ .type = BL_DEVICE_MOUNT,
+ .totallen = dev->mincount,
+ };
+ uint8_t *dataptr;
+ DECLARE_WAITQUEUE(wq, current);
+ int offset, len, i, rc;
+ struct net *net = server->nfs_client->cl_net;
+ struct nfs_net *nn = net_generic(net, nfs_net_id);
+ struct bl_dev_msg *reply = &nn->bl_mount_reply;
+
+ dprintk("%s CREATING PIPEFS MESSAGE\n", __func__);
+ dprintk("%s: deviceid: %s, mincount: %d\n", __func__, dev->dev_id.data,
+ dev->mincount);
+
+ bl_pipe_msg.bl_wq = &nn->bl_wq;
+ memset(msg, 0, sizeof(*msg));
+ msg->data = kzalloc(sizeof(bl_msg) + dev->mincount, gfp_mask);
+ if (!msg->data)
+ goto out;
+
+ memcpy(msg->data, &bl_msg, sizeof(bl_msg));
+ dataptr = (uint8_t *) msg->data;
+ len = dev->mincount;
+ offset = sizeof(bl_msg);
+ for (i = 0; len > 0; i++) {
+ memcpy(&dataptr[offset], page_address(dev->pages[i]),
+ len < PAGE_CACHE_SIZE ? len : PAGE_CACHE_SIZE);
+ len -= PAGE_CACHE_SIZE;
+ offset += PAGE_CACHE_SIZE;
+ }
+ msg->len = sizeof(bl_msg) + dev->mincount;
+
+ dprintk("%s CALLING USERSPACE DAEMON\n", __func__);
+ add_wait_queue(&nn->bl_wq, &wq);
+ rc = rpc_queue_upcall(nn->bl_device_pipe, msg);
+ if (rc < 0) {
+ remove_wait_queue(&nn->bl_wq, &wq);
+ goto out;
+ }
+
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule();
+ __set_current_state(TASK_RUNNING);
+ remove_wait_queue(&nn->bl_wq, &wq);
+
+ if (reply->status != BL_DEVICE_REQUEST_PROC) {
+ printk(KERN_WARNING "%s failed to decode device: %d\n",
+ __func__, reply->status);
+ goto out;
+ }
+
+ bd = blkdev_get_by_dev(MKDEV(reply->major, reply->minor),
+ FMODE_READ, NULL);
+ if (IS_ERR(bd)) {
+ printk(KERN_WARNING "%s failed to open device %d:%d (%ld)\n",
+ __func__, reply->major, reply->minor,
+ PTR_ERR(bd));
+ goto out;
+ }
+
+ rv = kzalloc(sizeof(*rv), gfp_mask);
+ if (!rv)
+ goto out;
+
+ nfs4_init_deviceid_node(&rv->d_node, server, &dev->dev_id);
+ rv->d_bdev = bd;
+
+ dprintk("%s Created device %s with bd_block_size %u\n",
+ __func__,
+ bd->bd_disk->disk_name,
+ bd->bd_block_size);
+
+ kfree(msg->data);
+ return &rv->d_node;
+
+out:
+ kfree(msg->data);
+ return NULL;
+}
+
+void
+bl_free_deviceid_node(struct nfs4_deviceid_node *d)
+{
+ struct pnfs_block_dev *dev =
+ container_of(d, struct pnfs_block_dev, d_node);
+ struct net *net = d->nfs_client->cl_net;
+
+ blkdev_put(dev->d_bdev, FMODE_READ);
+ bl_dm_remove(net, dev->d_bdev->bd_dev);
+
+ kfree(dev);
+}
+
+static ssize_t bl_pipe_downcall(struct file *filp, const char __user *src,
+ size_t mlen)
+{
+ struct nfs_net *nn = net_generic(filp->f_dentry->d_sb->s_fs_info,
+ nfs_net_id);
+
+ if (mlen != sizeof (struct bl_dev_msg))
+ return -EINVAL;
+
+ if (copy_from_user(&nn->bl_mount_reply, src, mlen) != 0)
+ return -EFAULT;
+
+ wake_up(&nn->bl_wq);
+
+ return mlen;
+}
+
+static void bl_pipe_destroy_msg(struct rpc_pipe_msg *msg)
+{
+ struct bl_pipe_msg *bl_pipe_msg =
+ container_of(msg, struct bl_pipe_msg, msg);
+
+ if (msg->errno >= 0)
+ return;
+ wake_up(bl_pipe_msg->bl_wq);
+}
+
+static const struct rpc_pipe_ops bl_upcall_ops = {
+ .upcall = rpc_pipe_generic_upcall,
+ .downcall = bl_pipe_downcall,
+ .destroy_msg = bl_pipe_destroy_msg,
+};
+
+static struct dentry *nfs4blocklayout_register_sb(struct super_block *sb,
+ struct rpc_pipe *pipe)
+{
+ struct dentry *dir, *dentry;
+
+ dir = rpc_d_lookup_sb(sb, NFS_PIPE_DIRNAME);
+ if (dir == NULL)
+ return ERR_PTR(-ENOENT);
+ dentry = rpc_mkpipe_dentry(dir, "blocklayout", NULL, pipe);
+ dput(dir);
+ return dentry;
+}
+
+static void nfs4blocklayout_unregister_sb(struct super_block *sb,
+ struct rpc_pipe *pipe)
+{
+ if (pipe->dentry)
+ rpc_unlink(pipe->dentry);
+}
+
+static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
+ void *ptr)
+{
+ struct super_block *sb = ptr;
+ struct net *net = sb->s_fs_info;
+ struct nfs_net *nn = net_generic(net, nfs_net_id);
+ struct dentry *dentry;
+ int ret = 0;
+
+ if (!try_module_get(THIS_MODULE))
+ return 0;
+
+ if (nn->bl_device_pipe == NULL) {
+ module_put(THIS_MODULE);
+ return 0;
+ }
+
+ switch (event) {
+ case RPC_PIPEFS_MOUNT:
+ dentry = nfs4blocklayout_register_sb(sb, nn->bl_device_pipe);
+ if (IS_ERR(dentry)) {
+ ret = PTR_ERR(dentry);
+ break;
+ }
+ nn->bl_device_pipe->dentry = dentry;
+ break;
+ case RPC_PIPEFS_UMOUNT:
+ if (nn->bl_device_pipe->dentry)
+ nfs4blocklayout_unregister_sb(sb, nn->bl_device_pipe);
+ break;
+ default:
+ ret = -ENOTSUPP;
+ break;
+ }
+ module_put(THIS_MODULE);
+ return ret;
+}
+
+static struct notifier_block nfs4blocklayout_block = {
+ .notifier_call = rpc_pipefs_event,
+};
+
+static struct dentry *nfs4blocklayout_register_net(struct net *net,
+ struct rpc_pipe *pipe)
+{
+ struct super_block *pipefs_sb;
+ struct dentry *dentry;
+
+ pipefs_sb = rpc_get_sb_net(net);
+ if (!pipefs_sb)
+ return NULL;
+ dentry = nfs4blocklayout_register_sb(pipefs_sb, pipe);
+ rpc_put_sb_net(net);
+ return dentry;
+}
+
+static void nfs4blocklayout_unregister_net(struct net *net,
+ struct rpc_pipe *pipe)
+{
+ struct super_block *pipefs_sb;
+
+ pipefs_sb = rpc_get_sb_net(net);
+ if (pipefs_sb) {
+ nfs4blocklayout_unregister_sb(pipefs_sb, pipe);
+ rpc_put_sb_net(net);
+ }
+}
+
+static int nfs4blocklayout_net_init(struct net *net)
+{
+ struct nfs_net *nn = net_generic(net, nfs_net_id);
+ struct dentry *dentry;
+
+ init_waitqueue_head(&nn->bl_wq);
+ nn->bl_device_pipe = rpc_mkpipe_data(&bl_upcall_ops, 0);
+ if (IS_ERR(nn->bl_device_pipe))
+ return PTR_ERR(nn->bl_device_pipe);
+ dentry = nfs4blocklayout_register_net(net, nn->bl_device_pipe);
+ if (IS_ERR(dentry)) {
+ rpc_destroy_pipe_data(nn->bl_device_pipe);
+ return PTR_ERR(dentry);
+ }
+ nn->bl_device_pipe->dentry = dentry;
+ return 0;
+}
+
+static void nfs4blocklayout_net_exit(struct net *net)
+{
+ struct nfs_net *nn = net_generic(net, nfs_net_id);
+
+ nfs4blocklayout_unregister_net(net, nn->bl_device_pipe);
+ rpc_destroy_pipe_data(nn->bl_device_pipe);
+ nn->bl_device_pipe = NULL;
+}
+
+static struct pernet_operations nfs4blocklayout_net_ops = {
+ .init = nfs4blocklayout_net_init,
+ .exit = nfs4blocklayout_net_exit,
+};
+
+int __init bl_init_pipefs(void)
+{
+ int ret;
+
+ ret = rpc_pipefs_notifier_register(&nfs4blocklayout_block);
+ if (ret)
+ goto out;
+ ret = register_pernet_subsys(&nfs4blocklayout_net_ops);
+ if (ret)
+ goto out_unregister_notifier;
+ return 0;
+
+out_unregister_notifier:
+ rpc_pipefs_notifier_unregister(&nfs4blocklayout_block);
+out:
+ return ret;
+}
+
+void __exit bl_cleanup_pipefs(void)
+{
+ rpc_pipefs_notifier_unregister(&nfs4blocklayout_block);
+ unregister_pernet_subsys(&nfs4blocklayout_net_ops);
+}
projects / karo-tx-linux.git / commitdiff