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Subject[PATCH 3/3] replacement patch for pipefs and sockfs
Hi Andrew,
I sent a set of 3 patches to you a week or so ago. This patch is a
replacement for the third one in the set. Either one will work, but I think
this is a better approach. The main differences here are:

1) pipefs declares its drop_inode function to be generic_delete_inode, which
obviates the need to have the fs make certain that i_nlink is properly set
at drop_inode time.

2) this makes also makes sockfs use unique i_ino values.

Signed-off-by: Jeff Layton <jlayton@redhat.com>

diff --git a/fs/pipe.c b/fs/pipe.c
index 68090e8..9b3cb34 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -871,6 +871,8 @@ static struct inode * get_pipe_inode(void)
inode->i_uid = current->fsuid;
inode->i_gid = current->fsgid;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+ inode->i_ino = iunique(pipe_mnt->mnt_sb, 1);
+ insert_inode_hash(inode);

return inode;

@@ -1003,6 +1005,11 @@ int do_pipe(int *fd)
return error;
}

+static struct super_operations pipefs_sops = {
+ .statfs = simple_statfs,
+ .drop_inode = generic_delete_inode,
+};
+
/*
* pipefs should _never_ be mounted by userland - too much of security hassle,
* no real gain from having the whole whorehouse mounted. So we don't need
@@ -1013,7 +1020,7 @@ static int pipefs_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data,
struct vfsmount *mnt)
{
- return get_sb_pseudo(fs_type, "pipe:", NULL, PIPEFS_MAGIC, mnt);
+ return get_sb_pseudo(fs_type, "pipe:", &pipefs_sops, PIPEFS_MAGIC, mnt);
}

static struct file_system_type pipe_fs_type = {
diff --git a/net/socket.c b/net/socket.c
index 4e39631..20193a8 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -284,6 +284,7 @@ static int init_inodecache(void)
static struct super_operations sockfs_ops = {
.alloc_inode = sock_alloc_inode,
.destroy_inode =sock_destroy_inode,
+ .drop_inode = generic_delete_inode,
.statfs = simple_statfs,
};

@@ -495,6 +496,8 @@ static struct socket *sock_alloc(void)
inode->i_mode = S_IFSOCK | S_IRWXUGO;
inode->i_uid = current->fsuid;
inode->i_gid = current->fsgid;
+ inode->i_ino = iunique(sock_mnt->mnt_sb, 1);
+ insert_inode_hash(inode);

get_cpu_var(sockets_in_use)++;
put_cpu_var(sockets_in_use);
-
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