OpenVZ Forum


Home » Mailing lists » Devel » [PATCH v3, RESEND 00/16] make rpc_pipefs be mountable multiple time
[PATCH v3, RESEND 14/16] sunrpc: make rpc_pipefs be mountable multiple times [message #42056 is a reply to message #42046] Tue, 08 February 2011 18:42 Go to previous messageGo to previous message
Kirill A. Shutemov is currently offline  Kirill A. Shutemov
Messages: 37
Registered: January 2011
Member
To support containers, allow multiple independent instances of
rpc_pipefs. Use '-o newinstance' to create new of the filesystem.
The same semantics as with devpts.

Signed-off-by: Kirill A. Shutemov <kas@openvz.org>
Reviewed-by: Rob Landley <rlandley@parallels.com>
---
net/sunrpc/rpc_pipe.c | 80 ++++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 79 insertions(+), 1 deletions(-)

diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index 1261f27..f824f33 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -19,6 +19,7 @@
#include <linux/nsproxy.h>
#include <linux/mnt_namespace.h>
#include <linux/fs_struct.h>
+#include <linux/parser.h>

#include <asm/ioctls.h>
#include <linux/fs.h>
@@ -41,6 +42,49 @@ static struct kmem_cache *rpc_inode_cachep __read_mostly;

#define RPC_UPCALL_TIMEOUT (30*HZ)

+struct rpc_mount_opts {
+ int newinstance;
+};
+
+enum {
+ Opt_newinstance,
+
+ Opt_err
+};
+
+static const match_table_t tokens = {
+ {Opt_newinstance, "newinstance"},
+
+ {Opt_err, NULL}
+};
+
+static int
+parse_mount_options(char *data, struct rpc_mount_opts *opts)
+{
+ char *p;
+
+ opts->newinstance = 0;
+
+ while ((p = strsep(&data, ",")) != NULL) {
+ substring_t args[MAX_OPT_ARGS];
+ int token;
+
+ if (!*p)
+ continue;
+
+ token = match_token(p, tokens, args);
+ switch (token) {
+ case Opt_newinstance:
+ opts->newinstance = 1;
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
static void rpc_purge_list(struct rpc_inode *rpci, struct list_head *head,
void (*destroy_msg)(struct rpc_pipe_msg *), int err)
{
@@ -1093,11 +1137,45 @@ rpc_fill_super(struct super_block *sb, void *data, int silent)
return 0;
}

+static int
+compare_rpc_mnt_sb(struct super_block *s, void *p)
+{
+ if (init_rpc_pipefs)
+ return init_rpc_pipefs->mnt_sb == s;
+ return 0;
+}
+
static struct dentry *
rpc_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
{
- return mount_single(fs_type, flags, data, rpc_fill_super);
+ int error;
+ struct rpc_mount_opts opts;
+ struct super_block *s;
+
+ error = parse_mount_options(data, &opts);
+ if (error)
+ return ERR_PTR(error);
+
+ if (opts.newinstance)
+ s = sget(fs_type, NULL, set_anon_super, NULL);
+ else
+ s = sget(fs_type, compare_rpc_mnt_sb, set_anon_super, NULL);
+
+ if (IS_ERR(s))
+ return ERR_CAST(s);
+
+ if (!s->s_root) {
+ s->s_flags = flags;
+ error = rpc_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
+ if (error) {
+ deactivate_locked_super(s);
+ return ERR_PTR(error);
+ }
+ s->s_flags |= MS_ACTIVE;
+ }
+
+ return dget(s->s_root);
}

static void rpc_kill_sb(struct super_block *sb)
--
1.7.4

_______________________________________________
Containers mailing list
Containers@lists.linux-foundation.org
https://lists.linux-foundation.org/mailman/listinfo/containe rs

Report message to a moderator

[Message index]
 
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Previous Topic: [PATCH v3, RESEND 04/16] sunrpc: tag svc_serv with rpc_pipefs mount point
Next Topic: [PATCH 0/1, v5] cgroup/freezer: add per freezer duty ratio control
Goto Forum:
  

[ Syndicate this forum (XML) ] [ RSS ] [ PDF ]

Current Time: Thu Jul 31 10:27:40 GMT 2025

Total time taken to generate the page: 0.57269 seconds
Powered by FUDforum Powered by Virtuozzo Containers