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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
Download patch file Download diff file Expand all files Collapse all files

19
kernel/sysctl_binary.c
View file

@ -1321,13 +1321,11 @@ static ssize_t binary_sysctl(const int *name, int nlen,
void __user *oldval, size_t oldlen, void __user *newval, size_t newlen)
{
const struct bin_table *table = NULL;
struct nameidata nd;
struct vfsmount *mnt;
struct file *file;
ssize_t result;
char *pathname;
int flags;
int acc_mode;
pathname = sysctl_getname(name, nlen, &table);
result = PTR_ERR(pathname);
@ -1337,28 +1335,17 @@ static ssize_t binary_sysctl(const int *name, int nlen,
/* How should the sysctl be accessed? */
if (oldval && oldlen && newval && newlen) {
flags = O_RDWR;
acc_mode = MAY_READ | MAY_WRITE;
} else if (newval && newlen) {
flags = O_WRONLY;
acc_mode = MAY_WRITE;
} else if (oldval && oldlen) {
flags = O_RDONLY;
acc_mode = MAY_READ;
} else {
result = 0;
goto out_putname;
}
mnt = current->nsproxy->pid_ns->proc_mnt;
result = vfs_path_lookup(mnt->mnt_root, mnt, pathname, 0, &nd);
if (result)
goto out_putname;
result = may_open(&nd.path, acc_mode, flags);
if (result)
goto out_putpath;
file = dentry_open(nd.path.dentry, nd.path.mnt, flags, current_cred());
file = file_open_root(mnt->mnt_root, mnt, pathname, flags);
result = PTR_ERR(file);
if (IS_ERR(file))
goto out_putname;
@ -1370,10 +1357,6 @@ out_putname:
putname(pathname);
out:
return result;
out_putpath:
path_put(&nd.path);
goto out_putname;
}