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SUNRPC: Add a field to track the number of kernel users of an rpc_pipe 

This allows us to correctly deduce when we need to remove the pipe.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2007-06-08 14:14:53 -04:00
parent 62e1761cef
commit 03a1256f06
2 changed files with 9 additions and 4 deletions
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1
include/linux/sunrpc/rpc_pipe_fs.h
View File

@ -27,6 +27,7 @@ struct rpc_inode {
int pipelen;
int nreaders;
int nwriters;
int nkern_readwriters;
wait_queue_head_t waitq;
#define RPC_PIPE_WAIT_FOR_OPEN 1
int flags;

12
net/sunrpc/rpc_pipe.c
View File

@ -737,6 +737,7 @@ rpc_mkpipe(struct dentry *parent, const char *name, void *private, struct rpc_pi
dput (dentry);
dentry = ERR_PTR(-EBUSY);
}
rpci->nkern_readwriters++;
goto out;
}
inode = rpc_get_inode(dir->i_sb, S_IFIFO | S_IRUSR | S_IWUSR);
@ -749,6 +750,7 @@ rpc_mkpipe(struct dentry *parent, const char *name, void *private, struct rpc_pi
rpci->private = private;
rpci->flags = flags;
rpci->ops = ops;
rpci->nkern_readwriters = 1;
inode_dir_notify(dir, DN_CREATE);
dget(dentry);
out:
@ -773,10 +775,12 @@ rpc_unlink(struct dentry *dentry)
parent = dget_parent(dentry);
dir = parent->d_inode;
mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
rpc_close_pipes(dentry->d_inode);
error = simple_unlink(dir, dentry);
if (!error)
d_delete(dentry);
if (--RPC_I(dentry->d_inode)->nkern_readwriters == 0) {
rpc_close_pipes(dentry->d_inode);
error = simple_unlink(dir, dentry);
if (!error)
d_delete(dentry);
}
dput(dentry);
mutex_unlock(&dir->i_mutex);
dput(parent);