| commit | d093166dbab62418c468481891cdfbc70e3c73f9 | |
| author | Al Viro <viro@zeniv.linux.org.uk> | |
| Mon, 30 Mar 2009 11:20:30 +0000 (30 07:20 -0400) | ||
| committer | Greg Kroah-Hartman <gregkh@suse.de> | |
| Fri, 8 May 2009 22:45:08 +0000 (8 15:45 -0700) | ||
| tree | b1670550e00462bd9e68c7933c0f0e839da786f2 | treesnapshot (tar.gz zip) |
| parent | 83e8c55f17f8d55f755b8983e1192cf1e1f711cd | commitdiff |
New locking/refcounting for fs_struct
commit 498052bba55ecaff58db6a1436b0e25bfd75a7ff upstream.
* all changes of current->fs are done under task_lock and write_lock of
old fs->lock
* refcount is not atomic anymore (same protection)
* its decrements are done when removing reference from current; at the
same time we decide whether to free it.
* put_fs_struct() is gone
* new field - ->in_exec. Set by check_unsafe_exec() if we are trying to do
execve() and only subthreads share fs_struct. Cleared when finishing exec
(success and failure alike). Makes CLONE_FS fail with -EAGAIN if set.
* check_unsafe_exec() may fail with -EAGAIN if another execve() from subthread
is in progress.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
commit 498052bba55ecaff58db6a1436b0e25bfd75a7ff upstream.
* all changes of current->fs are done under task_lock and write_lock of
old fs->lock
* refcount is not atomic anymore (same protection)
* its decrements are done when removing reference from current; at the
same time we decide whether to free it.
* put_fs_struct() is gone
* new field - ->in_exec. Set by check_unsafe_exec() if we are trying to do
execve() and only subthreads share fs_struct. Cleared when finishing exec
(success and failure alike). Makes CLONE_FS fail with -EAGAIN if set.
* check_unsafe_exec() may fail with -EAGAIN if another execve() from subthread
is in progress.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>