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expose a low-level variant of fd_install() for binder

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Similar situation to that of __alloc_fd(); do not use unless you
really have to.  You should not touch any descriptor table other
than your own; it's a sure sign of a really bad API design.

As with __alloc_fd(), you *must* use a first-class reference to
struct files_struct; something obtained by get_files_struct(some task)
(let alone direct task->files) will not do.  It must be either
current->files, or obtained by get_files_struct(current) by the
owner of that sucker and given to you.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2012-08-15 21:06:33 -04:00
parent 56007cae94
commit f869e8a7f7
3 changed files with 18 additions and 13 deletions
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2
include/linux/fdtable.h
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@@ -121,6 +121,8 @@ struct files_struct *dup_fd(struct files_struct *, int *);
extern int __alloc_fd(struct files_struct *files,
unsigned start, unsigned end, unsigned flags);
extern void __fd_install(struct files_struct *files,
unsigned int fd, struct file *file);
extern struct kmem_cache *files_cachep;