Christoph Lameter pointed out that ram disk pages also clutter the LRU
lists.  When vmscan finds them dirty and tries to clean them, the ram disk
writeback function just redirties the page so that it goes back onto the
active list.  Round and round she goes...

With the ram disk driver [rd.c] replaced by the newer 'brd.c', this is no
longer the case, as ram disk pages are no longer maintained on the lru.
[This makes them unmigratable for defrag or memory hot remove, but that
can be addressed by a separate patch series.] However, the ramfs pages
behave like ram disk pages used to, so:

Define new address_space flag [shares address_space flags member with
mapping's gfp mask] to indicate that the address space contains all
unevictable pages.  This will provide for efficient testing of ramfs pages
in page_evictable().

Also provide wrapper functions to set/test the unevictable state to
minimize #ifdefs in ramfs driver and any other users of this facility.

Set the unevictable state on address_space structures for new ramfs
inodes.  Test the unevictable state in page_evictable() to cull
unevictable pages.

These changes depend on [CONFIG_]UNEVICTABLE_LRU.

[riel@redhat.com: undo the brd.c part]
Signed-off-by: NLee Schermerhorn <lee.schermerhorn@hp.com>
Signed-off-by: NRik van Riel <riel@redhat.com>
Debugged-by: NNick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Report unevictable pages per zone and system wide.

Kosaki Motohiro added support for memory controller unevictable
statistics.

[riel@redhat.com: fix printk in show_free_areas()]
[akpm@linux-foundation.org: fix units in /proc/vmstats]
Signed-off-by: NLee Schermerhorn <lee.schermerhorn@hp.com>
Signed-off-by: NRik van Riel <riel@redhat.com>
Signed-off-by: NKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Debugged-by: NHiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Split the LRU lists in two, one set for pages that are backed by real file
systems ("file") and one for pages that are backed by memory and swap
("anon").  The latter includes tmpfs.

The advantage of doing this is that the VM will not have to scan over lots
of anonymous pages (which we generally do not want to swap out), just to
find the page cache pages that it should evict.

This patch has the infrastructure and a basic policy to balance how much
we scan the anon lists and how much we scan the file lists.  The big
policy changes are in separate patches.

[lee.schermerhorn@hp.com: collect lru meminfo statistics from correct offset]
[kosaki.motohiro@jp.fujitsu.com: prevent incorrect oom under split_lru]
[kosaki.motohiro@jp.fujitsu.com: fix pagevec_move_tail() doesn't treat unevictable page]
[hugh@veritas.com: memcg swapbacked pages active]
[hugh@veritas.com: splitlru: BDI_CAP_SWAP_BACKED]
[akpm@linux-foundation.org: fix /proc/vmstat units]
[nishimura@mxp.nes.nec.co.jp: memcg: fix handling of shmem migration]
[kosaki.motohiro@jp.fujitsu.com: adjust Quicklists field of /proc/meminfo]
[kosaki.motohiro@jp.fujitsu.com: fix style issue of get_scan_ratio()]
Signed-off-by: NRik van Riel <riel@redhat.com>
Signed-off-by: NLee Schermerhorn <Lee.Schermerhorn@hp.com>
Signed-off-by: NKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: NHugh Dickins <hugh@veritas.com>
Signed-off-by: NDaisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Fix block kernel-doc warnings:

Warning(linux-2.6.27-git4//fs/block_dev.c:1272): No description found for parameter 'path'
Warning(linux-2.6.27-git4//block/blk-core.c:1021): No description found for parameter 'cpu'
Warning(linux-2.6.27-git4//block/blk-core.c:1021): No description found for parameter 'part'
Warning(/var/linsrc/linux-2.6.27-git4//block/genhd.c:544): No description found for parameter 'partno'
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NJens Axboe <jens.axboe@oracle.com>

With extended devt, finding out the partition number becomes a bit
more challenging as subtracting the minor number from that of the
parent device doesn't work anymore.  The only thing left is parsing
the partition name which is brittle and not exactly universal (some
have '-' between the device name and partition number while others
don't).  This patch introduced partition attribute which contains the
partition number of the device.  This should make finding partitions
and its index easier.

This problem and solution were suggested by H. Peter Anvin.
Signed-off-by: NTejun Heo <tj@kernel.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: NJens Axboe <jens.axboe@oracle.com>

If the HUGE_FILE feature flag is not set, don't allow the creation of
large files, instead of automatically enabling the feature flag.
Recent versions of mke2fs will set the HUGE_FILE flag automatically
anyway for ext4 filesystems.
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>

The multiblock allocator needs to be able to release blocks (and issue
a blkdev discard request) when the transaction which freed those
blocks is committed.  Previously this was done via a polling mechanism
when blocks are allocated or freed.  A much better way of doing things
is to create a jbd2 callback function and attaching the list of blocks
to be freed directly to the transaction structure.
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>

These mount options don't actually do anything any more, so remove
them.
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>

Signed-off-by: NManish Katiyar <mkatiyar@gmail.com>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>

There are some newlines missing in ext4_check_descriptors, which
cause the printk level to be printed out when the next printk call
is made:

[  778.847265] EXT4-fs: ext4_check_descriptors: Block bitmap for group 0
not in group (block 1509949442)!<3>EXT4-fs: group descriptors corrupted!
[  802.646630] EXT4-fs: ext4_check_descriptors: Inode bitmap for group 0
not in group (block 9043971)!<3>EXT4-fs: group descriptors corrupted!
Signed-off-by: NEric Sesterhenn <snakebyte@gmx.de>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>

This patchs adds the CONFIG_AIO option which allows to remove support
for asynchronous I/O operations, that are not necessarly used by
applications, particularly on embedded devices. As this is a
size-reduction option, it depends on CONFIG_EMBEDDED. It allows to
save ~7 kilobytes of kernel code/data:

   text	   data	    bss	    dec	    hex	filename
1115067	 119180	 217088	1451335	 162547	vmlinux
1108025	 119048	 217088	1444161	 160941	vmlinux.new
  -7042    -132       0   -7174   -1C06 +/-

This patch has been originally written by Matt Mackall
<mpm@selenic.com>, and is part of the Linux Tiny project.

[randy.dunlap@oracle.com: build fix]
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Zach Brown <zach.brown@oracle.com>
Signed-off-by: NMatt Mackall <mpm@selenic.com>
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Cannot assume writes will fully complete, so this conversion goes the easy
way and always brings the page uptodate before the write.

[dhowells@redhat.com: style tweaks]
Signed-off-by: NNick Piggin <npiggin@suse.de>
Acked-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

de_thread() checks if the old leader was the ->child_reaper, this is not
possible any longer.  With the previous patch ->group_leader itself will
change ->child_reaper on exit.

Henceforth find_new_reaper() is the only function (apart from
initialization) which plays with ->child_reaper.
Signed-off-by: NOleg Nesterov <oleg@tv-sign.ru>
Acked-by: NSerge Hallyn <serue@us.ibm.com>
Acked-by: NPavel Emelyanov <xemul@openvz.org>
Acked-by: NSukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Move it into sysrq.c, along with the rest of the sysrq implementation.
Signed-off-by: NAlexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

We currently follow blindly what the partition table lies about the
disk, and let the kernel create block devices which can not be accessed.
Trying to identify the device leads to kernel logs full of:
  sdb: rw=0, want=73392, limit=28800
  attempt to access beyond end of device

Here is an example of a broken partition table, where sda2 starts
behind the end of the disk, and sdb3 is larger than the entire disk:
  Disk /dev/sdb: 14 MB, 14745600 bytes
  1 heads, 29 sectors/track, 993 cylinders, total 28800 sectors
     Device Boot      Start         End      Blocks   Id  System
  /dev/sdb1              29        7800        3886   83  Linux
  /dev/sdb2           37801       45601        3900+  83  Linux
  /dev/sdb3           15602       73402       28900+  83  Linux
  /dev/sdb4           23403       28796        2697   83  Linux

The kernel creates these completely invalid devices, which can not be
accessed, or may lead to other unpredictable failures:
  grep . /sys/class/block/sdb*/{start,size}
  /sys/class/block/sdb/size:28800
  /sys/class/block/sdb1/start:29
  /sys/class/block/sdb1/size:7772
  /sys/class/block/sdb2/start:37801
  /sys/class/block/sdb2/size:7801
  /sys/class/block/sdb3/start:15602
  /sys/class/block/sdb3/size:57801
  /sys/class/block/sdb4/start:23403
  /sys/class/block/sdb4/size:5394

With this patch, we ignore partitions which start behind the end of the disk,
and limit partitions to the end of the disk if they pretend to be larger:
  grep . /sys/class/block/sdb*/{start,size}
  /sys/class/block/sdb/size:28800
  /sys/class/block/sdb1/start:29
  /sys/class/block/sdb1/size:7772
  /sys/class/block/sdb3/start:15602
  /sys/class/block/sdb3/size:13198
  /sys/class/block/sdb4/start:23403
  /sys/class/block/sdb4/size:5394

These warnings are printed to the kernel log:
  sdb: p2 ignored, start 37801 is behind the end of the disk
  sdb: p3 size 57801 limited to end of disk
Signed-off-by: NKay Sievers <kay.sievers@vrfy.org>
Cc: Herton Ronaldo Krzesinski <herton@mandriva.com.br>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

I missed this when I did the arm26 removal.
Reported-by: NRobert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: NAdrian Bunk <bunk@kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Don't repeat BINFMT_ELF definition, simply multiply COMPAT and BINFMT_ELF.
Signed-off-by: NAlexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

These auxvec entries are the only ones left unhandled out of the current
base implementation. This syncs up binfmt_elf_fdpic with linux/auxvec.h
and current binfmt_elf.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>
Acked-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

binfmt_elf_fdpic seems to have grabbed a hard-coded hack from an ancient
version of binfmt_elf in order to try and fix up initial stack alignment
on multi-threaded x86, which while in addition to being unused, was also
pushed down beyond the first set of operations on the stack pointer,
negating the entire purpose.

These days, we have an architecture independent arch_align_stack(), so we
switch to using that instead. Move the initial alignment up before the
initial stores while we're at it.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Commit 483fad1c ("ELF loader support for
auxvec base platform string") introduced AT_BASE_PLATFORM, but only
implemented it for binfmt_elf.

Given that AT_VECTOR_SIZE_BASE is unconditionally enlarged for us, and
it's only optionally added in for the platforms that set
ELF_BASE_PLATFORM, wire it up for binfmt_elf_fdpic, too.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>
Acked-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Remove CVS keywords that weren't updated for a long time from comments.
Signed-off-by: NAdrian Bunk <bunk@kernel.org>
Acked-by: NJan Kara <jack@suse.cz>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

In case of error, the function open_xa_dir returns an ERR pointer, but
never returns a NULL pointer.  So a NULL test that comes after an IS_ERR
test should be deleted.

The semantic match that finds this problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@match_bad_null_test@
expression x, E;
statement S1,S2;
@@
x = open_xa_dir(...)
... when != x = E
(
*  if (x == NULL && ...) S1 else S2
|
*  if (x == NULL || ...) S1 else S2
)
// </smpl>
Signed-off-by: NJulien Brunel <brunel@diku.dk>
Signed-off-by: NJulia Lawall <julia@diku.dk>
Cc: Jeff Mahoney <jeffm@suse.com>
Cc: Jan Kara <jack@ucw.cz>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Remove CVS keywords that weren't updated for a long time from comments.
Signed-off-by: NAdrian Bunk <bunk@kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Fix a stack corruption caused by a corrupted hfs filesystem.  If the
catalog name length is corrupted the memcpy overwrites the catalog btree
structure.  Since the field is limited to HFS_NAMELEN bytes in the
structure and the file format, we throw an error if it is too long.

Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: NEric Sesterhenn <snakebyte@gmx.de>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

While testing more corrupted images with hfsplus, i came across
one which triggered the following bug:

[15840.675016] BUG: unable to handle kernel paging request at fffffffb
[15840.675016] IP: [<c0116a4f>] kmap+0x15/0x56
[15840.675016] *pde = 00008067 *pte = 00000000
[15840.675016] Oops: 0000 [#1] PREEMPT DEBUG_PAGEALLOC
[15840.675016] Modules linked in:
[15840.675016]
[15840.675016] Pid: 11575, comm: ln Not tainted (2.6.27-rc4-00123-gd3ee1b40-dirty #29)
[15840.675016] EIP: 0060:[<c0116a4f>] EFLAGS: 00010202 CPU: 0
[15840.675016] EIP is at kmap+0x15/0x56
[15840.675016] EAX: 00000246 EBX: fffffffb ECX: 00000000 EDX: cab919c0
[15840.675016] ESI: 000007dd EDI: cab0bcf4 EBP: cab0bc98 ESP: cab0bc94
[15840.675016]  DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068
[15840.675016] Process ln (pid: 11575, ti=cab0b000 task=cab919c0 task.ti=cab0b000)
[15840.675016] Stack: 00000000 cab0bcdc c0231cfb 00000000 cab0bce0 00000800 ca9290c0 fffffffb
[15840.675016]        cab145d0 cab919c0 cab15998 22222222 22222222 22222222 00000001 cab15960
[15840.675016]        000007dd cab0bcf4 cab0bd04 c022cb3a cab0bcf4 cab15a6c ca9290c0 00000000
[15840.675016] Call Trace:
[15840.675016]  [<c0231cfb>] ? hfsplus_block_allocate+0x6f/0x2d3
[15840.675016]  [<c022cb3a>] ? hfsplus_file_extend+0xc4/0x1db
[15840.675016]  [<c022ce41>] ? hfsplus_get_block+0x8c/0x19d
[15840.675016]  [<c06adde4>] ? sub_preempt_count+0x9d/0xab
[15840.675016]  [<c019ece6>] ? __block_prepare_write+0x147/0x311
[15840.675016]  [<c0161934>] ? __grab_cache_page+0x52/0x73
[15840.675016]  [<c019ef4f>] ? block_write_begin+0x79/0xd5
[15840.675016]  [<c022cdb5>] ? hfsplus_get_block+0x0/0x19d
[15840.675016]  [<c019f22a>] ? cont_write_begin+0x27f/0x2af
[15840.675016]  [<c022cdb5>] ? hfsplus_get_block+0x0/0x19d
[15840.675016]  [<c0139ebe>] ? tick_program_event+0x28/0x4c
[15840.675016]  [<c013bd35>] ? trace_hardirqs_off+0xb/0xd
[15840.675016]  [<c022b723>] ? hfsplus_write_begin+0x2d/0x32
[15840.675016]  [<c022cdb5>] ? hfsplus_get_block+0x0/0x19d
[15840.675016]  [<c0161988>] ? pagecache_write_begin+0x33/0x107
[15840.675016]  [<c01879e5>] ? __page_symlink+0x3c/0xae
[15840.675016]  [<c019ad34>] ? __mark_inode_dirty+0x12f/0x137
[15840.675016]  [<c0187a70>] ? page_symlink+0x19/0x1e
[15840.675016]  [<c022e6eb>] ? hfsplus_symlink+0x41/0xa6
[15840.675016]  [<c01886a9>] ? vfs_symlink+0x99/0x101
[15840.675016]  [<c018a2f6>] ? sys_symlinkat+0x6b/0xad
[15840.675016]  [<c018a348>] ? sys_symlink+0x10/0x12
[15840.675016]  [<c01038bd>] ? sysenter_do_call+0x12/0x31
[15840.675016]  =======================
[15840.675016] Code: 00 00 75 10 83 3d 88 2f ec c0 02 75 07 89 d0 e8 12 56 05 00 5d c3 55 ba 06 00 00 00 89 e5 53 89 c3 b8 3d eb 7e c0 e8 16 74 00 00 <8b> 03 c1 e8 1e 69 c0 d8 02 00 00 05 b8 69 8e c0 2b 80 c4 02 00
[15840.675016] EIP: [<c0116a4f>] kmap+0x15/0x56 SS:ESP 0068:cab0bc94
[15840.675016] ---[ end trace 4fea40dad6b70e5f ]---

This happens because the return value of read_mapping_page() is passed on
to kmap unchecked.  The bug is triggered after the first
read_mapping_page() in hfsplus_block_allocate(), this patch fixes all
three usages in this functions but leaves the ones further down in the
file unchanged.
Signed-off-by: NEric Sesterhenn <snakebyte@gmx.de>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

When an hfsplus image gets corrupted it might happen that the catalog
namelength field gets b0rked.  If we mount such an image the memcpy() in
hfsplus_cat_build_key_uni() writes more than the 255 that fit in the name
field.  Depending on the size of the overwritten data, we either only get
memory corruption or also trigger an oops like this:

[  221.628020] BUG: unable to handle kernel paging request at c82b0000
[  221.629066] IP: [<c022d4b1>] hfsplus_find_cat+0x10d/0x151
[  221.629066] *pde = 0ea29163 *pte = 082b0160
[  221.629066] Oops: 0002 [#1] PREEMPT DEBUG_PAGEALLOC
[  221.629066] Modules linked in:
[  221.629066]
[  221.629066] Pid: 4845, comm: mount Not tainted (2.6.27-rc4-00123-gd3ee1b40-dirty #28)
[  221.629066] EIP: 0060:[<c022d4b1>] EFLAGS: 00010206 CPU: 0
[  221.629066] EIP is at hfsplus_find_cat+0x10d/0x151
[  221.629066] EAX: 00000029 EBX: 00016210 ECX: 000042c2 EDX: 00000002
[  221.629066] ESI: c82d70ca EDI: c82b0000 EBP: c82d1bcc ESP: c82d199c
[  221.629066]  DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068
[  221.629066] Process mount (pid: 4845, ti=c82d1000 task=c8224060 task.ti=c82d1000)
[  221.629066] Stack: c080b3c4 c82aa8f8 c82d19c2 00016210 c080b3be c82d1bd4 c82aa8f0 00000300
[  221.629066]        01000000 750008b1 74006e00 74006900 65006c00 c82d6400 c013bd35 c8224060
[  221.629066]        00000036 00000046 c82d19f0 00000082 c8224548 c8224060 00000036 c0d653cc
[  221.629066] Call Trace:
[  221.629066]  [<c013bd35>] ? trace_hardirqs_off+0xb/0xd
[  221.629066]  [<c013bca3>] ? trace_hardirqs_off_caller+0x14/0x9b
[  221.629066]  [<c013bd35>] ? trace_hardirqs_off+0xb/0xd
[  221.629066]  [<c013bca3>] ? trace_hardirqs_off_caller+0x14/0x9b
[  221.629066]  [<c013bd35>] ? trace_hardirqs_off+0xb/0xd
[  221.629066]  [<c0107aa3>] ? native_sched_clock+0x82/0x96
[  221.629066]  [<c01302d2>] ? __kernel_text_address+0x1b/0x27
[  221.629066]  [<c010487a>] ? dump_trace+0xca/0xd6
[  221.629066]  [<c0109e32>] ? save_stack_address+0x0/0x2c
[  221.629066]  [<c0109eaf>] ? save_stack_trace+0x1c/0x3a
[  221.629066]  [<c013b571>] ? save_trace+0x37/0x8d
[  221.629066]  [<c013b62e>] ? add_lock_to_list+0x67/0x8d
[  221.629066]  [<c013ea1c>] ? validate_chain+0x8a4/0x9f4
[  221.629066]  [<c013553d>] ? down+0xc/0x2f
[  221.629066]  [<c013f1f6>] ? __lock_acquire+0x68a/0x6e0
[  221.629066]  [<c013bd35>] ? trace_hardirqs_off+0xb/0xd
[  221.629066]  [<c013bca3>] ? trace_hardirqs_off_caller+0x14/0x9b
[  221.629066]  [<c013bd35>] ? trace_hardirqs_off+0xb/0xd
[  221.629066]  [<c0107aa3>] ? native_sched_clock+0x82/0x96
[  221.629066]  [<c013da5d>] ? mark_held_locks+0x43/0x5a
[  221.629066]  [<c013dc3a>] ? trace_hardirqs_on+0xb/0xd
[  221.629066]  [<c013dbf4>] ? trace_hardirqs_on_caller+0xf4/0x12f
[  221.629066]  [<c06abec8>] ? _spin_unlock_irqrestore+0x42/0x58
[  221.629066]  [<c013555c>] ? down+0x2b/0x2f
[  221.629066]  [<c022aa68>] ? hfsplus_iget+0xa0/0x154
[  221.629066]  [<c022b0b9>] ? hfsplus_fill_super+0x280/0x447
[  221.629066]  [<c0107aa3>] ? native_sched_clock+0x82/0x96
[  221.629066]  [<c013bca3>] ? trace_hardirqs_off_caller+0x14/0x9b
[  221.629066]  [<c013bca3>] ? trace_hardirqs_off_caller+0x14/0x9b
[  221.629066]  [<c013f1f6>] ? __lock_acquire+0x68a/0x6e0
[  221.629066]  [<c041c9e4>] ? string+0x2b/0x74
[  221.629066]  [<c041cd16>] ? vsnprintf+0x2e9/0x512
[  221.629066]  [<c010487a>] ? dump_trace+0xca/0xd6
[  221.629066]  [<c0109eaf>] ? save_stack_trace+0x1c/0x3a
[  221.629066]  [<c0109eaf>] ? save_stack_trace+0x1c/0x3a
[  221.629066]  [<c013b571>] ? save_trace+0x37/0x8d
[  221.629066]  [<c013b62e>] ? add_lock_to_list+0x67/0x8d
[  221.629066]  [<c013ea1c>] ? validate_chain+0x8a4/0x9f4
[  221.629066]  [<c01354d3>] ? up+0xc/0x2f
[  221.629066]  [<c013f1f6>] ? __lock_acquire+0x68a/0x6e0
[  221.629066]  [<c013bd35>] ? trace_hardirqs_off+0xb/0xd
[  221.629066]  [<c013bca3>] ? trace_hardirqs_off_caller+0x14/0x9b
[  221.629066]  [<c013bd35>] ? trace_hardirqs_off+0xb/0xd
[  221.629066]  [<c0107aa3>] ? native_sched_clock+0x82/0x96
[  221.629066]  [<c041cfb7>] ? snprintf+0x1b/0x1d
[  221.629066]  [<c01ba466>] ? disk_name+0x25/0x67
[  221.629066]  [<c0183960>] ? get_sb_bdev+0xcd/0x10b
[  221.629066]  [<c016ad92>] ? kstrdup+0x2a/0x4c
[  221.629066]  [<c022a7b3>] ? hfsplus_get_sb+0x13/0x15
[  221.629066]  [<c022ae39>] ? hfsplus_fill_super+0x0/0x447
[  221.629066]  [<c0183583>] ? vfs_kern_mount+0x3b/0x76
[  221.629066]  [<c0183602>] ? do_kern_mount+0x32/0xba
[  221.629066]  [<c01960d4>] ? do_new_mount+0x46/0x74
[  221.629066]  [<c0196277>] ? do_mount+0x175/0x193
[  221.629066]  [<c013dbf4>] ? trace_hardirqs_on_caller+0xf4/0x12f
[  221.629066]  [<c01663b2>] ? __get_free_pages+0x1e/0x24
[  221.629066]  [<c06ac07b>] ? lock_kernel+0x19/0x8c
[  221.629066]  [<c01962e6>] ? sys_mount+0x51/0x9b
[  221.629066]  [<c01962f9>] ? sys_mount+0x64/0x9b
[  221.629066]  [<c01038bd>] ? sysenter_do_call+0x12/0x31
[  221.629066]  =======================
[  221.629066] Code: 89 c2 c1 e2 08 c1 e8 08 09 c2 8b 85 e8 fd ff ff 66 89 50 06 89 c7 53 83 c7 08 56 57 68 c4 b3 80 c0 e8 8c 5c ef ff 89 d9 c1 e9 02 <f3> a5 89 d9 83 e1 03 74 02 f3 a4 83 c3 06 8b 95 e8 fd ff ff 0f
[  221.629066] EIP: [<c022d4b1>] hfsplus_find_cat+0x10d/0x151 SS:ESP 0068:c82d199c
[  221.629066] ---[ end trace e417a1d67f0d0066 ]---

Since hfsplus_cat_build_key_uni() returns void and only has one callsite,
the check is performed at the callsite.
Signed-off-by: NEric Sesterhenn <snakebyte@gmx.de>
Reviewed-by: NPekka Enberg <penberg@cs.helsinki.fi>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Check whether the file system was to be mounted read only anyway before
warning about changing the mount to read only.
Signed-off-by: NMike Crowe <mac@mcrowe.com>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Does compile-time byteswapping rather than runtime.

Noticed by sparse:
fs/befs/super.c:29:6: warning: cast to restricted __le32
fs/befs/super.c:29:6: warning: cast from restricted fs32
fs/befs/super.c:31:11: warning: cast to restricted __be32
fs/befs/super.c:31:11: warning: cast from restricted fs32
fs/befs/super.c:31:11: warning: cast to restricted __be32
fs/befs/super.c:31:11: warning: cast from restricted fs32
fs/befs/super.c:31:11: warning: cast to restricted __be32
fs/befs/super.c:31:11: warning: cast from restricted fs32
fs/befs/super.c:31:11: warning: cast to restricted __be32
fs/befs/super.c:31:11: warning: cast from restricted fs32
fs/befs/super.c:31:11: warning: cast to restricted __be32
fs/befs/super.c:31:11: warning: cast from restricted fs32
fs/befs/super.c:31:11: warning: cast to restricted __be32
fs/befs/super.c:31:11: warning: cast from restricted fs32
fs/befs/linuxvfs.c:811:7: warning: cast to restricted __le32
fs/befs/linuxvfs.c:811:7: warning: cast from restricted fs32
fs/befs/linuxvfs.c:812:7: warning: cast to restricted __be32
fs/befs/linuxvfs.c:812:7: warning: cast from restricted fs32
fs/befs/linuxvfs.c:812:7: warning: cast to restricted __be32
fs/befs/linuxvfs.c:812:7: warning: cast from restricted fs32
fs/befs/linuxvfs.c:812:7: warning: cast to restricted __be32
fs/befs/linuxvfs.c:812:7: warning: cast from restricted fs32
fs/befs/linuxvfs.c:812:7: warning: cast to restricted __be32
fs/befs/linuxvfs.c:812:7: warning: cast from restricted fs32
fs/befs/linuxvfs.c:812:7: warning: cast to restricted __be32
fs/befs/linuxvfs.c:812:7: warning: cast from restricted fs32
fs/befs/linuxvfs.c:812:7: warning: cast to restricted __be32
fs/befs/linuxvfs.c:812:7: warning: cast from restricted fs32
Signed-off-by: NHarvey Harrison <harvey.harrison@gmail.com>
Cc: "Sergey S. Kostyliov" <rathamahata@php4.ru>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

A very large directory with many read failures (either due to storage
problems, or due to invalid size & blocks from corruption) will generate a
printk storm as the filesystem continues to try to read all the blocks.
This flood of messages can tie up the box until it is complete - which may
be a very long time, especially for very large corrupted values.

This is fixed by only reporting the corruption once each time we try to
read the directory.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: NEric Sandeen <sandeen@redhat.com>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
Cc: Eugene Teo <eugeneteo@kernel.sg>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

We could run into ENOSPC error on ext2, even when there is free blocks on
the filesystem.

The problem is triggered in the case the goal block group has 0 free
blocks , and the rest block groups are skipped due to the check of
"free_blocks < windowsz/2".  Current code could fall back to non
reservation allocation to prevent early ENOSPC after examing all the block
groups with reservation on , but this code was bypassed if the reservation
window is turned off already, which is true in this case.

This patch fixed two issues:
1) We don't need to turn off block reservation if the goal block group has
0 free blocks left and continue search for the rest of block groups.

Current code the intention is to turn off the block reservation if the
goal allocation group has a few (some) free blocks left (not enough for
make the desired reservation window),to try to allocation in the goal
block group, to get better locality.  But if the goal blocks have 0 free
blocks, it should leave the block reservation on, and continues search for
the next block groups,rather than turn off block reservation completely.

2) we don't need to check the window size if the block reservation is off.

The problem was originally found and fixed in ext4.
Signed-off-by: NMingming Cao <cmm@us.ibm.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Add a miscellaneous device to the autofs4 module for routing ioctls.  This
provides the ability to obtain an ioctl file handle for an autofs mount
point that is possibly covered by another mount.

The actual problem with autofs is that it can't reconnect to existing
mounts.  Immediately one things of just adding the ability to remount
autofs file systems would solve it, but alas, that can't work.  This is
because autofs direct mounts and the implementation of "on demand mount
and expire" of nested mount trees have the file system mounted on top of
the mount trigger dentry.

To resolve this a miscellaneous device node for routing ioctl commands to
these mount points has been implemented in the autofs4 kernel module and a
library added to autofs.  This provides the ability to open a file
descriptor for these over mounted autofs mount points.

Please refer to Documentation/filesystems/autofs4-mount-control.txt for a
discussion of the problem, implementation alternatives considered and a
description of the interface.

[akpm@linux-foundation.org: coding-style fixes]
[akpm@linux-foundation.org: build fix]
Signed-off-by: NIan Kent <raven@themaw.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Track the uid and gid of the last process to request a mount for on an
autofs dentry.

[akpm@linux-foundation.org: fix tpyo in comment]
Signed-off-by: NIan Kent <raven@themaw.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Usage of the AUTOFS_TYPE_* defines is a little confusing and appears
inconsistent.
Signed-off-by: NIan Kent <raven@themaw.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

The netlink transport code has not worked for a while and the miscdev
transport is a simpler solution.  This patch removes the netlink code and
makes the miscdev transport the only eCryptfs kernel to userspace
transport.
Signed-off-by: NTyler Hicks <tyhicks@linux.vnet.ibm.com>
Cc: Michael Halcrow <mhalcrow@us.ibm.com>
Cc: Dustin Kirkland <kirkland@canonical.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Convert ecryptfs to use write_begin/write_end
Signed-off-by: NNick Piggin <npiggin@suse.de>
Signed-off-by: NBadari Pulavarty <pbadari@us.ibm.com>
Acked-by: NMichael Halcrow <mhalcrow@us.ibm.com>
Cc: Dave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

The retry block in ecryptfs_readdir() has been in the eCryptfs code base
for a while, apparently for no good reason.  This loop could potentially
run without terminating.  This patch removes the loop, instead erroring
out if vfs_readdir() on the lower file fails.
Signed-off-by: NMichael Halcrow <mhalcrow@us.ibm.com>
Reported-by: NAl Viro <viro@ZinIV.linux.org.uk>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

binfmt_script and binfmt_misc disallow recursion to avoid stack overflow
using sh_bang and misc_bang.  It causes problem in some cases:

$ echo '#!/bin/ls' > /tmp/t0
$ echo '#!/tmp/t0' > /tmp/t1
$ echo '#!/tmp/t1' > /tmp/t2
$ chmod +x /tmp/t*
$ /tmp/t2
zsh: exec format error: /tmp/t2

Similar problem with binfmt_misc.

This patch introduces field 'recursion_depth' into struct linux_binprm to
track recursion level in binfmt_misc and binfmt_script.  If recursion
level more then BINPRM_MAX_RECURSION it generates -ENOEXEC.

[akpm@linux-foundation.org: make linux_binprm.recursion_depth a uint]
Signed-off-by: NKirill A. Shutemov <kirill@shutemov.name>
Cc: Pavel Emelyanov <xemul@openvz.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

This change is Alpha-specific.  It adds field 'taso' into struct
linux_binprm to remember if the application is TASO.  Previously, field
sh_bang was used for this purpose.
Signed-off-by: NKirill A. Shutemov <kirill@shutemov.name>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Pavel Emelyanov <xemul@openvz.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Add the missing MODULE_LICENSE("GPL").
Reported-by: NAdrian Bunk <bunk@kernel.org>
Signed-off-by: NAdrian Bunk <bunk@kernel.org>
Cc: Matthew Wilcox <matthew@wil.cx>
Cc: Grant Grundler <grundler@parisc-linux.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

struct stat / compat_stat is the same on all architectures, so
cp_compat_stat should be, too.

Turns out it is, except that various architectures have slightly and some
high2lowuid/high2lowgid or the direct assignment instead of the
SET_UID/SET_GID that expands to the correct one anyway.

This patch replaces the arch-specific cp_compat_stat implementations with
a common one based on the x86-64 one.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Acked-by: David S. Miller <davem@davemloft.net> [ sparc bits ]
Acked-by: Kyle McMartin <kyle@mcmartin.ca> [ parisc bits ]
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>