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bury struct proc_ns in fs/proc

Browse source 
a) make get_proc_ns() return a pointer to struct ns_common
b) mirror ns_ops in dentry->d_fsdata of ns dentries, so that
is_mnt_ns_file() could get away with fewer dereferences.

That way struct proc_ns becomes invisible outside of fs/proc/*.c

Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Al Viro 2014-11-01 03:13:17 -04:00
commit f77c80142e
6 changed files with 15 additions and 27 deletions
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13
fs/namespace.c
View file

@ -1570,16 +1570,7 @@ static bool is_mnt_ns_file(struct dentry *dentry)
{
/* Is this a proxy for a mount namespace? */
struct inode *inode = dentry->d_inode;
struct proc_ns *ei;
if (!proc_ns_inode(inode))
return false;
ei = get_proc_ns(inode);
if (ei->ns_ops != &mntns_operations)
return false;
return true;
return proc_ns_inode(inode) && dentry->d_fsdata == &mntns_operations;
}
struct mnt_namespace *to_mnt_ns(struct ns_common *ns)
@ -1596,7 +1587,7 @@ static bool mnt_ns_loop(struct dentry *dentry)
if (!is_mnt_ns_file(dentry))
return false;
mnt_ns = to_mnt_ns(get_proc_ns(dentry->d_inode)->ns);
mnt_ns = to_mnt_ns(get_proc_ns(dentry->d_inode));
return current->nsproxy->mnt_ns->seq >= mnt_ns->seq;
}