linux.git/fs/proc/task_mmu.c, branch v2.6.26

Fix pagemap_read() use of struct mm_walk

2008-07-05T20:13:44+00:00

Fix some issues in pagemap_read noted by Alexey:

- initialize pagemap_walk.mm to "mm" , so the code starts working as
  advertised

- initialize ->private to "&pm" so it wouldn't immediately oops in
  pagemap_pte_hole()

- unstatic struct pagemap_walk, so two threads won't fsckup each other
  (including those started by root, including flipping ->mm when you don't
  have permissions)

- pagemap_read() contains two calls to ptrace_may_attach(), second one
  looks unneeded.

- avoid possible kmalloc(0) and integer wraparound.

Cc: Alexey Dobriyan 
Cc: Matt Mackall 
Signed-off-by: Andrew Morton 
[ Personally, I'd just remove the functionality entirely  - Linus ]
Signed-off-by: Linus Torvalds

Fix clear_refs_write() use of struct mm_walk

2008-07-05T20:07:56+00:00

Don't use a static entry, so as to prevent races during concurrent use
of this function.

Reported-by: Alexey Dobriyan 
Cc: Matt Mackall 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

pagemap: fix large pages in pagemap

2008-06-13T01:05:41+00:00

We were walking right into huge page areas in the pagemap walker, and
calling the pmds pmd_bad() and clearing them.

That leaked huge pages.  Bad.

This patch at least works around that for now.  It ignores huge pages in
the pagemap walker for the time being, and won't leak those pages.

Signed-off-by: Dave Hansen 
Acked-by: Matt Mackall 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

pagemap: pass mm into pagewalkers

2008-06-13T01:05:41+00:00

We need this at least for huge page detection for now, because powerpc
needs the vm_area_struct to be able to determine whether a virtual address
is referring to a huge page (its pmd_huge() doesn't work).

It might also come in handy for some of the other users.

Signed-off-by: Dave Hansen 
Acked-by: Matt Mackall 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

pagemap: fix bug in add_to_pagemap, require aligned-length reads of /proc/pid/pagemap

2008-06-06T18:29:11+00:00

Fix a bug in add_to_pagemap.  Previously, since pm->out was a char *,
put_user was only copying 1 byte of every PFN, resulting in the top 7
bytes of each PFN not being copied.  By requiring that reads be a multiple
of 8 bytes, I can make pm->out and pm->end u64*s instead of char*s, which
makes put_user work properly, and also simplifies the logic in
add_to_pagemap a bit.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Thomas Tuttle 
Cc: Matt Mackall 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

fs/proc/task_mmu.c: remove duplicated include files

2008-05-08T17:56:22+00:00

Removed duplicated include files  and  in
fs/proc/task_mmu.c.

Signed-off-by: Huang Weiyi 
Signed-off-by: Linus Torvalds

procfs task exe symlink

2008-04-29T15:06:17+00:00

The kernel implements readlink of /proc/pid/exe by getting the file from
the first executable VMA.  Then the path to the file is reconstructed and
reported as the result.

Because of the VMA walk the code is slightly different on nommu systems.
This patch avoids separate /proc/pid/exe code on nommu systems.  Instead of
walking the VMAs to find the first executable file-backed VMA we store a
reference to the exec'd file in the mm_struct.

That reference would prevent the filesystem holding the executable file
from being unmounted even after unmapping the VMAs.  So we track the number
of VM_EXECUTABLE VMAs and drop the new reference when the last one is
unmapped.  This avoids pinning the mounted filesystem.

[akpm@linux-foundation.org: improve comments]
[yamamoto@valinux.co.jp: fix dup_mmap]
Signed-off-by: Matt Helsley 
Cc: Oleg Nesterov 
Cc: David Howells 
Cc:"Eric W. Biederman" 
Cc: Christoph Hellwig 
Cc: Al Viro 
Cc: Hugh Dickins 
Signed-off-by: YAMAMOTO Takashi 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

smaps: account swap entries

2008-04-28T15:58:22+00:00

Show the amount of swap for each vma.  This can be used to see where all the
swap goes.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Peter Zijlstra 
Acked-by: Matt Mackall 
Acked-by: KOSAKI Motohiro 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

make swap_pte_to_pagemap_entry() static

2008-04-28T15:58:18+00:00

Make the needlessly global swap_pte_to_pagemap_entry() static.

Signed-off-by: Adrian Bunk 
Acked-by: Matt Mackall 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Change pagemap output format to allow for future reporting of huge pages

2008-03-23T00:03:10+00:00

Change pagemap output format to allow for future reporting of huge pages.

(Format comment and minor cleanups: mpm@selenic.com)

Signed-off-by: Hans Rosenfeld 
Signed-off-by: Matt Mackall 
Signed-off-by: Linus Torvalds