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[PATCH] sanitize unshare_files/reset_files_struct

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* let unshare_files() give caller the displaced files_struct
* don't bother with grabbing reference only to drop it in the
  caller if it hadn't been shared in the first place
* in that form unshare_files() is trivially implemented via
  unshare_fd(), so we eliminate the duplicate logics in fork.c
* reset_files_struct() is not just only called for current;
  it will break the system if somebody ever calls it for anything
  else (we can't modify ->files of somebody else).  Lose the
  task_struct * argument.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2008-04-22 05:31:30 -04:00
parent fd8328be87
commit 3b1253880b
5 changed files with 34 additions and 47 deletions
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3
include/linux/fs.h
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@ -2033,9 +2033,6 @@ static inline ino_t parent_ino(struct dentry *dentry)
return res;
}
/* kernel/fork.c */
extern int unshare_files(void);
/* Transaction based IO helpers */
/*