tree 430d89096a9b56ffb8e80bd4febde39e1d05ad4c
parent 0ccb286346c4c0644be17f04a9eb23ad99262882
author Al Viro <viro@zeniv.linux.org.uk> 1394812967 -0400
committer Al Viro <viro@zeniv.linux.org.uk> 1396408752 -0400

mark struct file that had write access grabbed by open()

new flag in ->f_mode - FMODE_WRITER.  Set by do_dentry_open() in case
when it has grabbed write access, checked by __fput() to decide whether
it wants to drop the sucker.  Allows to stop bothering with mnt_clone_write()
in alloc_file(), along with fewer special_file() checks.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>