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Subject[PATCH v2 2/5] NFS: blocklayout pipe creation per network namespace context introduced
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This patch implements blocklayout pipe creation and registration per each
existent network namespace.
This was achived by registering NFS per-net operations, responsible for
blocklayout pipe allocation/register and unregister/destruction instead of
initialization and destruction of static "bl_device_pipe" pipe (this one was
removed).
Note, than pointer to network blocklayout pipe is stored in per-net "nfs_net"
structure, because allocating of one more per-net structure for blocklayout
module looks redundant.
This patch also changes dev_remove() function prototype (and all it's callers,
where it' requied) by adding network namespace pointer parameter, which is used
to discover proper blocklayout pipe for rpc_queue_upcall() call.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>

---
fs/nfs/blocklayout/blocklayout.c | 54 +++++++++++++++++++++++------------
fs/nfs/blocklayout/blocklayout.h | 3 +-
fs/nfs/blocklayout/blocklayoutdev.c | 5 +++
fs/nfs/blocklayout/blocklayoutdm.c | 7 +++--
fs/nfs/inode.c | 1 +
fs/nfs/netns.h | 1 +
6 files changed, 47 insertions(+), 24 deletions(-)
diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index 489f95c..ce76d05 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -46,7 +46,6 @@ MODULE_LICENSE("GPL");
MODULE_AUTHOR("Andy Adamson <andros@citi.umich.edu>");
MODULE_DESCRIPTION("The NFSv4.1 pNFS Block layout driver");

-struct rpc_pipe *bl_device_pipe;
wait_queue_head_t bl_wq;

static void print_page(struct page *page)
@@ -1011,6 +1010,37 @@ static void nfs4blocklayout_unregister_net(struct net *net,
}
}

+static int nfs4blocklayout_net_init(struct net *net)
+{
+ struct nfs_net *nn = net_generic(net, nfs_net_id);
+ struct dentry *dentry;
+
+ 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)
{
struct vfsmount *mnt;
@@ -1029,24 +1059,12 @@ static int __init nfs4blocklayout_init(void)
ret = PTR_ERR(mnt);
goto out_remove;
}
- bl_device_pipe = rpc_mkpipe_data(&bl_upcall_ops, 0);
- if (IS_ERR(bl_device_pipe)) {
- ret = PTR_ERR(bl_device_pipe);
- goto out_putrpc;
- }
- bl_device_pipe->dentry = nfs4blocklayout_register_net(&init_net,
- bl_device_pipe);
- if (IS_ERR(bl_device_pipe->dentry)) {
- ret = PTR_ERR(bl_device_pipe->dentry);
- goto out_destroy_pipe;
- }
+ ret = register_pernet_subsys(&nfs4blocklayout_net_ops);
+ if (ret)
+ goto out_remove;
out:
return ret;

-out_destroy_pipe:
- rpc_destroy_pipe_data(bl_device_pipe);
-out_putrpc:
- rpc_put_mount();
out_remove:
pnfs_unregister_layoutdriver(&blocklayout_type);
return ret;
@@ -1057,10 +1075,8 @@ static void __exit nfs4blocklayout_exit(void)
dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n",
__func__);

+ unregister_pernet_subsys(&nfs4blocklayout_net_ops);
pnfs_unregister_layoutdriver(&blocklayout_type);
- nfs4blocklayout_unregister_net(&init_net, bl_device_pipe);
- rpc_destroy_pipe_data(bl_device_pipe);
- rpc_put_mount();
}

MODULE_ALIAS("nfs-layouttype4-3");
diff --git a/fs/nfs/blocklayout/blocklayout.h b/fs/nfs/blocklayout/blocklayout.h
index 046b513..10e0a62 100644
--- a/fs/nfs/blocklayout/blocklayout.h
+++ b/fs/nfs/blocklayout/blocklayout.h
@@ -37,6 +37,7 @@
#include <linux/sunrpc/rpc_pipe_fs.h>

#include "../pnfs.h"
+#include "../netns.h"

#define PAGE_CACHE_SECTORS (PAGE_CACHE_SIZE >> SECTOR_SHIFT)
#define PAGE_CACHE_SECTOR_SHIFT (PAGE_CACHE_SHIFT - SECTOR_SHIFT)
@@ -50,6 +51,7 @@ struct pnfs_block_dev {
struct list_head bm_node;
struct nfs4_deviceid bm_mdevid; /* associated devid */
struct block_device *bm_mdev; /* meta device itself */
+ struct net *net;
};

enum exstate4 {
@@ -159,7 +161,6 @@ struct bl_msg_hdr {
u16 totallen; /* length of entire message, including hdr itself */
};

-extern struct rpc_pipe *bl_device_pipe;
extern wait_queue_head_t bl_wq;

#define BL_DEVICE_UMOUNT 0x0 /* Umount--delete devices */
diff --git a/fs/nfs/blocklayout/blocklayoutdev.c b/fs/nfs/blocklayout/blocklayoutdev.c
index 949b624..94ed978 100644
--- a/fs/nfs/blocklayout/blocklayoutdev.c
+++ b/fs/nfs/blocklayout/blocklayoutdev.c
@@ -120,6 +120,8 @@ nfs4_blk_decode_device(struct nfs_server *server,
DECLARE_WAITQUEUE(wq, current);
struct bl_dev_msg *reply = &bl_mount_reply;
int offset, len, i, rc;
+ struct net *net = server->nfs_client->net;
+ struct nfs_net *nn = net_generic(net, nfs_net_id);

dprintk("%s CREATING PIPEFS MESSAGE\n", __func__);
dprintk("%s: deviceid: %s, mincount: %d\n", __func__, dev->dev_id.data,
@@ -146,7 +148,7 @@ nfs4_blk_decode_device(struct nfs_server *server,

dprintk("%s CALLING USERSPACE DAEMON\n", __func__);
add_wait_queue(&bl_wq, &wq);
- rc = rpc_queue_upcall(bl_device_pipe, &msg);
+ rc = rpc_queue_upcall(nn->bl_device_pipe, &msg);
if (rc < 0) {
remove_wait_queue(&bl_wq, &wq);
rv = ERR_PTR(rc);
@@ -181,6 +183,7 @@ nfs4_blk_decode_device(struct nfs_server *server,

rv->bm_mdev = bd;
memcpy(&rv->bm_mdevid, &dev->dev_id, sizeof(struct nfs4_deviceid));
+ rv->net = net;
dprintk("%s Created device %s with bd_block_size %u\n",
__func__,
bd->bd_disk->disk_name,
diff --git a/fs/nfs/blocklayout/blocklayoutdm.c b/fs/nfs/blocklayout/blocklayoutdm.c
index 631f254..970490f 100644
--- a/fs/nfs/blocklayout/blocklayoutdm.c
+++ b/fs/nfs/blocklayout/blocklayoutdm.c
@@ -38,7 +38,7 @@

#define NFSDBG_FACILITY NFSDBG_PNFS_LD

-static void dev_remove(dev_t dev)
+static void dev_remove(struct net *net, dev_t dev)
{
struct rpc_pipe_msg msg;
struct bl_dev_msg bl_umount_request;
@@ -48,6 +48,7 @@ static void dev_remove(dev_t dev)
};
uint8_t *dataptr;
DECLARE_WAITQUEUE(wq, current);
+ struct nfs_net *nn = net_generic(net, nfs_net_id);

dprintk("Entering %s\n", __func__);

@@ -66,7 +67,7 @@ static void dev_remove(dev_t dev)
msg.len = sizeof(bl_msg) + bl_msg.totallen;

add_wait_queue(&bl_wq, &wq);
- if (rpc_queue_upcall(bl_device_pipe, &msg) < 0) {
+ if (rpc_queue_upcall(nn->bl_device_pipe, &msg) < 0) {
remove_wait_queue(&bl_wq, &wq);
goto out;
}
@@ -93,7 +94,7 @@ static void nfs4_blk_metadev_release(struct pnfs_block_dev *bdev)
printk(KERN_ERR "%s nfs4_blkdev_put returns %d\n",
__func__, rv);

- dev_remove(bdev->bm_mdev->bd_dev);
+ dev_remove(bdev->net, bdev->bm_mdev->bd_dev);
}

void bl_free_block_dev(struct pnfs_block_dev *bdev)
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 9590da3..60cf71a 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -1552,6 +1552,7 @@ static void nfsiod_stop(void)
}

int nfs_net_id;
+EXPORT_SYMBOL_GPL(nfs_net_id);

static int nfs_net_init(struct net *net)
{
diff --git a/fs/nfs/netns.h b/fs/nfs/netns.h
index 8c1f130..39ae4ca 100644
--- a/fs/nfs/netns.h
+++ b/fs/nfs/netns.h
@@ -6,6 +6,7 @@

struct nfs_net {
struct cache_detail *nfs_dns_resolve;
+ struct rpc_pipe *bl_device_pipe;
};

extern int nfs_net_id;


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