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vfs: define struct filename and have getname() return it

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getname() is intended to copy pathname strings from userspace into a
kernel buffer. The result is just a string in kernel space. It would
however be quite helpful to be able to attach some ancillary info to
the string.

For instance, we could attach some audit-related info to reduce the
amount of audit-related processing needed. When auditing is enabled,
we could also call getname() on the string more than once and not
need to recopy it from userspace.

This patchset converts the getname()/putname() interfaces to return
a struct instead of a string. For now, the struct just tracks the
string in kernel space and the original userland pointer for it.

Later, we'll add other information to the struct as it becomes
convenient.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Jeff Layton
2012-10-10 15:25:28 -04:00
committed by Al Viro
parent 8e377d1507
commit 91a27b2a75
40 changed files with 218 additions and 175 deletions
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4
fs/filesystems.c
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@@ -124,7 +124,7 @@ EXPORT_SYMBOL(unregister_filesystem);
static int fs_index(const char __user * __name)
{
struct file_system_type * tmp;
char * name;
struct filename *name;
int err, index;
name = getname(__name);
@@ -135,7 +135,7 @@ static int fs_index(const char __user * __name)
err = -EINVAL;
read_lock(&file_systems_lock);
for (tmp=file_systems, index=0 ; tmp ; tmp=tmp->next, index++) {
if (strcmp(tmp->name,name) == 0) {
if (strcmp(tmp->name, name->name) == 0) {
err = index;
break;
}