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Simplify exec_permission_lite(), part 3

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Don't call down to the generic inode_permission() function just to
call the inode-specific permission function - just do it directly.

The generic inode_permission() code does things like checking MAY_WRITE
and devcgroup_inode_permission(), neither of which are relevant for the
light pathname walk permission checks (we always do just MAY_EXEC, and
the inode is never a special device).

Reviewed-by: James Morris <jmorris@namei.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2009-08-28 11:08:31 -07:00
parent f1ac9f6bfe
commit cb9179ead0
1 changed files with 6 additions and 2 deletions
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8
fs/namei.c
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@ -434,8 +434,12 @@ static int exec_permission_lite(struct inode *inode)
{
umode_t mode = inode->i_mode;
if (inode->i_op->permission)
return inode_permission(inode, MAY_EXEC);
if (inode->i_op->permission) {
int ret = inode->i_op->permission(inode, MAY_EXEC);
if (!ret)
goto ok;
return ret;
}
if (current_fsuid() == inode->i_uid)
mode >>= 6;