linux.git/fs/file.c, branch v2.6.30

[PATCH] merge locate_fd() and get_unused_fd()

2008-08-01T15:25:23+00:00

	New primitive: alloc_fd(start, flags).  get_unused_fd() and
get_unused_fd_flags() become wrappers on top of it.

Signed-off-by: Al Viro

[PATCH] fix RLIM_NOFILE handling

2008-07-27T00:53:45+00:00

* dup2() should return -EBADF on exceeded sysctl_nr_open
* dup() should *not* return -EINVAL even if you have rlimit set to 0;
  it should get -EMFILE instead.

Check for orig_start exceeding rlimit taken to sys_fcntl().
Failing expand_files() in dup{2,3}() now gets -EMFILE remapped to -EBADF.
Consequently, remaining checks for rlimit are taken to expand_files().

Signed-off-by: Al Viro

[PATCH] avoid multiplication overflows and signedness issues for max_fds

2008-05-16T21:22:52+00:00

Limit sysctl_nr_open - we don't want ->max_fds to exceed MAX_INT and
we don't want size calculation for ->fd[] to overflow.

Signed-off-by: Al Viro

[PATCH] dup_fd() part 4 - race fix

2008-05-16T21:22:46+00:00

Parent _can_ be a clone task, contrary to the comment.  Moreover,
more files could be opened while we allocate a copy, in which case
we end up copying only part into new descriptor table.  Since what
we get _is_ affected by all changes in the old range, we can get
rather weird effects - e.g.
	dup2(0, 1024); close(0);
in parallel with fork() resulting in child that sees the effect of
close(), but not that of dup2() done just before that close().

What we need is to recalculate the open_count after having reacquired
->file_lock and if external fdtable we'd just allocated is too small for
it, free the sucker and redo allocation.

Signed-off-by: Al Viro

[PATCH] dup_fd() - part 3

2008-05-16T21:22:39+00:00

merge alloc_files() into dup_fd(), leave setting newf->fdt until the end

Signed-off-by: Al Viro

[PATCH] dup_fd() part 2

2008-05-16T21:22:33+00:00

use alloc_fdtable() instead of expand_files(), get rid of pointless
grabbing newf->file_lock, kill magic in copy_fdtable() that used to
be there only to skip copying when called from dup_fd().

Signed-off-by: Al Viro

[PATCH] dup_fd() fixes, part 1

2008-05-16T21:22:26+00:00

Move the sucker to fs/file.c in preparation to the rest

Signed-off-by: Al Viro

[PATCH] take init_files to fs/file.c

2008-05-16T21:22:20+00:00

Signed-off-by: Al Viro

[PATCH] fix sysctl_nr_open bugs

2008-05-01T17:08:57+00:00

* if luser with root sets it to something that is not a multiple of
  BITS_PER_LONG, the system is screwed.
* if it gets decreased at the wrong time, we can get expand_files()
  returning success and _not_ increasing the size of table as asked.

Signed-off-by: Al Viro

[PATCH] split linux/file.h

2008-05-01T17:08:16+00:00

Initial splitoff of the low-level stuff; taken to fdtable.h

Signed-off-by: Al Viro