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open-style analog of vfs_path_lookup()

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new function: file_open_root(dentry, mnt, name, flags) opens the file
vfs_path_lookup would arrive to.

Note that name can be empty; in that case the usual requirement that
dentry should be a directory is lifted.

open-coded equivalents switched to it, may_open() got down exactly
one caller and became static.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2011-03-11 12:08:24 -05:00
parent 5b6ca027d8
commit 73d049a40f
7 changed files with 77 additions and 84 deletions
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21
fs/nfsctl.c
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@@ -22,30 +22,17 @@
static struct file *do_open(char *name, int flags)
{
struct nameidata nd;
struct vfsmount *mnt;
int error;
struct file *file;
mnt = do_kern_mount("nfsd", 0, "nfsd", NULL);
if (IS_ERR(mnt))
return (struct file *)mnt;
error = vfs_path_lookup(mnt->mnt_root, mnt, name, 0, &nd);
file = file_open_root(mnt->mnt_root, mnt, name, flags);
mntput(mnt); /* drop do_kern_mount reference */
if (error)
return ERR_PTR(error);
if (flags == O_RDWR)
error = may_open(&nd.path, MAY_READ|MAY_WRITE, flags);
else
error = may_open(&nd.path, MAY_WRITE, flags);
if (!error)
return dentry_open(nd.path.dentry, nd.path.mnt, flags,
current_cred());
path_put(&nd.path);
return ERR_PTR(error);
return file;
}
static struct {