Commit Graph

19374 Commits

Author SHA1 Message Date
Linus Torvalds fbc1487019 Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs
* 'for-linus' of git://oss.sgi.com/xfs/xfs:
  xfs: log IO completion workqueue is a high priority queue
  xfs: prevent reading uninitialized stack memory
2010-09-10 18:19:26 -07:00
Dave Chinner 51749e47e1 xfs: log IO completion workqueue is a high priority queue
The workqueue implementation in 2.6.36-rcX has changed, resulting
in the workqueues no longer having dedicated threads for work
processing. This has caused severe livelocks under heavy parallel
create workloads because the log IO completions have been getting
held up behind metadata IO completions.  Hence log commits would
stall, memory allocation would stall because pages could not be
cleaned, and lock contention on the AIL during inode IO completion
processing was being seen to slow everything down even further.

By making the log Io completion workqueue a high priority workqueue,
they are queued ahead of all data/metadata IO completions and
processed before the data/metadata completions. Hence the log never
gets stalled, and operations needed to clean memory can continue as
quickly as possible. This avoids the livelock conditions and allos
the system to keep running under heavy load as per normal.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
2010-09-10 10:16:54 -05:00
Roland McGrath 9aea5a65aa execve: make responsive to SIGKILL with large arguments
An execve with a very large total of argument/environment strings
can take a really long time in the execve system call.  It runs
uninterruptibly to count and copy all the strings.  This change
makes it abort the exec quickly if sent a SIGKILL.

Note that this is the conservative change, to interrupt only for
SIGKILL, by using fatal_signal_pending().  It would be perfectly
correct semantics to let any signal interrupt the string-copying in
execve, i.e. use signal_pending() instead of fatal_signal_pending().
We'll save that change for later, since it could have user-visible
consequences, such as having a timer set too quickly make it so that
an execve can never complete, though it always happened to work before.

Signed-off-by: Roland McGrath <roland@redhat.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-09-10 08:10:26 -07:00
Roland McGrath 7993bc1f46 execve: improve interactivity with large arguments
This adds a preemption point during the copying of the argument and
environment strings for execve, in copy_strings().  There is already
a preemption point in the count() loop, so this doesn't add any new
points in the abstract sense.

When the total argument+environment strings are very large, the time
spent copying them can be much more than a normal user time slice.
So this change improves the interactivity of the rest of the system
when one process is doing an execve with very large arguments.

Signed-off-by: Roland McGrath <roland@redhat.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-09-10 08:10:26 -07:00
Roland McGrath 1b528181b2 setup_arg_pages: diagnose excessive argument size
The CONFIG_STACK_GROWSDOWN variant of setup_arg_pages() does not
check the size of the argument/environment area on the stack.
When it is unworkably large, shift_arg_pages() hits its BUG_ON.
This is exploitable with a very large RLIMIT_STACK limit, to
create a crash pretty easily.

Check that the initial stack is not too large to make it possible
to map in any executable.  We're not checking that the actual
executable (or intepreter, for binfmt_elf) will fit.  So those
mappings might clobber part of the initial stack mapping.  But
that is just userland lossage that userland made happen, not a
kernel problem.

Signed-off-by: Roland McGrath <roland@redhat.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-09-10 08:10:26 -07:00
Linus Torvalds ff3cb3fec3 Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block
* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  block: Range check cpu in blk_cpu_to_group
  scatterlist: prevent invalid free when alloc fails
  writeback: Fix lost wake-up shutting down writeback thread
  writeback: do not lose wakeup events when forking bdi threads
  cciss: fix reporting of max queue depth since init
  block: switch s390 tape_block and mg_disk to elevator_change()
  block: add function call to switch the IO scheduler from a driver
  fs/bio-integrity.c: return -ENOMEM on kmalloc failure
  bio-integrity.c: remove dependency on __GFP_NOFAIL
  BLOCK: fix bio.bi_rw handling
  block: put dev->kobj in blk_register_queue fail path
  cciss: handle allocation failure
  cfq-iosched: Documentation help for new tunables
  cfq-iosched: blktrace print per slice sector stats
  cfq-iosched: Implement tunable group_idle
  cfq-iosched: Do group share accounting in IOPS when slice_idle=0
  cfq-iosched: Do not idle if slice_idle=0
  cciss: disable doorbell reset on reset_devices
  blkio: Fix return code for mkdir calls
2010-09-10 07:26:27 -07:00
Dan Rosenberg a122eb2fdf xfs: prevent reading uninitialized stack memory
The XFS_IOC_FSGETXATTR ioctl allows unprivileged users to read 12
bytes of uninitialized stack memory, because the fsxattr struct
declared on the stack in xfs_ioc_fsgetxattr() does not alter (or zero)
the 12-byte fsx_pad member before copying it back to the user.  This
patch takes care of it.

Signed-off-by: Dan Rosenberg <dan.j.rosenberg@gmail.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Alex Elder <aelder@sgi.com>
2010-09-10 07:39:28 -05:00
Jorge Boncompte [DTI2] eee743fd7e minix: fix regression in minix_mkdir()
Commit 9eed1fb721 ("minix: replace inode uid,gid,mode init with helper")
broke directory creation on minix filesystems.

Fix it by passing the needed mode flag to inode init helper.

Signed-off-by: Jorge Boncompte [DTI2] <jorge@dti2.net>
Cc: Dmitry Monakhov <dmonakhov@openvz.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: <stable@kernel.org>		[2.6.35.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-09-09 18:57:25 -07:00
James Bottomley 3ab04d5cf9 vfs: take O_NONBLOCK out of the O_* uniqueness test
O_NONBLOCK on parisc has a dual value:

#define O_NONBLOCK	000200004 /* HPUX has separate NDELAY & NONBLOCK */

It is caught by the O_* bits uniqueness check and leads to a parisc
compile error.  The fix would be to take O_NONBLOCK out.

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Cc: Jamie Lokier <jamie@shareable.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-09-09 18:57:25 -07:00
Jan Sembera ee3aebdd8f binfmt_misc: fix binfmt_misc priority
Commit 74641f584d ("alpha: binfmt_aout fix") (May 2009) introduced a
regression - binfmt_misc is now consulted after binfmt_elf, which will
unfortunately break ia32el.  ia32 ELF binaries on ia64 used to be matched
using binfmt_misc and executed using wrapper.  As 32bit binaries are now
matched by binfmt_elf before bindmt_misc kicks in, the wrapper is ignored.

The fix increases precedence of binfmt_misc to the original state.

Signed-off-by: Jan Sembera <jsembera@suse.cz>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Richard Henderson <rth@twiddle.net
Cc: <stable@kernel.org>		[2.6.everything.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-09-09 18:57:24 -07:00
Takashi Iwai ed430fec75 proc: export uncached bit properly in /proc/kpageflags
Fix the left-over old ifdef for PG_uncached in /proc/kpageflags.  Now it's
used by x86, too.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-09-09 18:57:23 -07:00
Jeff Moyer 7a801ac6f5 O_DIRECT: fix the splitting up of contiguous I/O
commit c2c6ca4 (direct-io: do not merge logically non-contiguous requests)
introduced a bug whereby all O_DIRECT I/Os were submitted a page at a time
to the block layer.  The problem is that the code expected
dio->block_in_file to correspond to the current page in the dio.  In fact,
it corresponds to the previous page submitted via submit_page_section.
This was purely an oversight, as the dio->cur_page_fs_offset field was
introduced for just this purpose.  This patch simply uses the correct
variable when calculating whether there is a mismatch between contiguous
logical blocks and contiguous physical blocks (as described in the
comments).

I also switched the if conditional following this check to an else if, to
ensure that we never call dio_bio_submit twice for the same dio (in
theory, this should not happen, anyway).

I've tested this by running blktrace and verifying that a 64KB I/O was
submitted as a single I/O.  I also ran the patched kernel through
xfstests' aio tests using xfs, ext4 (with 1k and 4k block sizes) and btrfs
and verified that there were no regressions as compared to an unpatched
kernel.

Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Acked-by: Josef Bacik <jbacik@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: <stable@kernel.org>		[2.6.35.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-09-09 18:57:22 -07:00
Stefan Bader 39aa3cb3e8 mm: Move vma_stack_continue into mm.h
So it can be used by all that need to check for that.

Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-09-09 09:05:06 -07:00
Linus Torvalds cad46744a3 Merge branch 'fixes' of git://oss.oracle.com/git/tma/linux-2.6
* 'fixes' of git://oss.oracle.com/git/tma/linux-2.6:
  ocfs2: Fix orphan add in ocfs2_create_inode_in_orphan
  ocfs2: split out ocfs2_prepare_orphan_dir() into locking and prep functions
  ocfs2: allow return of new inode block location before allocation of the inode
  ocfs2: use ocfs2_alloc_dinode_update_counts() instead of open coding
  ocfs2: split out inode alloc code from ocfs2_mknod_locked
  Ocfs2: Fix a regression bug from mainline commit(6b933c8e6f).
  ocfs2: Fix deadlock when allocating page
  ocfs2: properly set and use inode group alloc hint
  ocfs2: Use the right group in nfs sync check.
  ocfs2: Flush drive's caches on fdatasync
  ocfs2: make __ocfs2_page_mkwrite handle file end properly.
  ocfs2: Fix incorrect checksum validation error
  ocfs2: Fix metaecc error messages
2010-09-09 08:57:02 -07:00
Linus Torvalds c8c727db41 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse:
  fuse: fix lock annotations
  fuse: flush background queue on connection close
2010-09-08 11:12:59 -07:00
Mark Fasheh 97b8f4a9df ocfs2: Fix orphan add in ocfs2_create_inode_in_orphan
ocfs2_create_inode_in_orphan() is used by reflink to create the newly
reflinked inode simultaneously in the orphan dir. This allows us to easily
handle partially-reflinked files during recovery cleanup.

We have a problem though - the orphan dir stringifies inode # to determine
a unique name under which the orphan entry dirent can be created. Since
ocfs2_create_inode_in_orphan() needs the space allocated in the orphan dir
before it can allocate the inode, we currently call into the orphan code:

       /*
        * We give the orphan dir the root blkno to fake an orphan name,
        * and allocate enough space for our insertion.
        */
       status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
                                         osb->root_blkno,
                                         orphan_name, &orphan_insert);

Using osb->root_blkno might work fine on unindexed directories, but the
orphan dir can have an index.  When it has that index, the above code fails
to allocate the proper index entry.  Later, when we try to remove the file
from the orphan dir (using the actual inode #), the reflink operation will
fail.

To fix this, I created a function ocfs2_alloc_orphaned_file() which uses the
newly split out orphan and inode alloc code to figure out what the inode
block number will be (once allocated) and then prepare the orphan dir from
that data.

Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Tao Ma <tao.ma@oracle.com>
2010-09-08 14:26:00 +08:00
Mark Fasheh dd43bcde23 ocfs2: split out ocfs2_prepare_orphan_dir() into locking and prep functions
We do this because ocfs2_create_inode_in_orphan() wants to order locking of
the orphan dir with respect to locking of the inode allocator *before*
making any changes to the directory.

Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Tao Ma <tao.ma@oracle.com>
2010-09-08 14:26:00 +08:00
Mark Fasheh e49e27674d ocfs2: allow return of new inode block location before allocation of the inode
This allows code which needs to know the eventual block number of an inode
but can't allocate it yet due to transaction or lock ordering. For example,
ocfs2_create_inode_in_orphan() currently gives a junk blkno for preparation
of the orphan dir because it can't yet know where the actual inode is placed
- that code is actually in ocfs2_mknod_locked. This is a problem when the
orphan dirs are indexed as the junk inode number will create an index entry
which goes unused (and fails the later removal from the orphan dir).  Now
with these interfaces, ocfs2_create_inode_in_orphan() can run the block
group search (and get back the inode block number) *before* any actual
allocation occurs.

Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Tao Ma <tao.ma@oracle.com>
2010-09-08 14:25:59 +08:00
Mark Fasheh d51349829c ocfs2: use ocfs2_alloc_dinode_update_counts() instead of open coding
ocfs2_search_chain() makes the same updates as
ocfs2_alloc_dinode_update_counts to the alloc inode. Instead of open coding
the bitmap update, use our helper function.

Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Tao Ma <tao.ma@oracle.com>
2010-09-08 14:25:58 +08:00
Mark Fasheh 021960cab3 ocfs2: split out inode alloc code from ocfs2_mknod_locked
Do this by splitting the bulk of the function away from the inode allocation
code at the very tom of ocfs2_mknod_locked(). Existing callers don't need to
change and won't see any difference. The new function created,
__ocfs2_mknod_locked() will be used shortly.

Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Tao Ma <tao.ma@oracle.com>
2010-09-08 14:25:58 +08:00
Tristan Ye 81c8c82b5a Ocfs2: Fix a regression bug from mainline commit(6b933c8e6f).
The patch is to fix the regression bug brought from commit 6b933c8...( 'ocfs2:
Avoid direct write if we fall back to buffered I/O'):

http://oss.oracle.com/bugzilla/show_bug.cgi?id=1285

The commit 6b933c8e6f changed __generic_file_aio_write
to generic_file_buffered_write, which didn't call filemap_{write,wait}_range to  flush
the pagecaches when we were falling O_DIRECT writes back to buffered ones. it did hurt
the O_DIRECT semantics somehow in extented odirect writes.

This patch tries to guarantee O_DIRECT writes of 'fall back to buffered' to be correctly
flushed.

Signed-off-by: Tristan Ye <tristan.ye@oracle.com>
Signed-off-by: Tao Ma <tao.ma@oracle.com>
2010-09-08 14:25:57 +08:00
Jan Kara 9b4c0ff32c ocfs2: Fix deadlock when allocating page
We cannot call grab_cache_page() when holding filesystem locks or with
a transaction started as grab_cache_page() calls page allocation with
GFP_KERNEL flag and thus page reclaim can recurse back into the filesystem
causing deadlocks or various assertion failures. We have to use
find_or_create_page() instead and pass it GFP_NOFS as we do with other
allocations.

Acked-by: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Tao Ma <tao.ma@oracle.com>
2010-09-08 14:25:57 +08:00
Mark Fasheh b2b6ebf5f7 ocfs2: properly set and use inode group alloc hint
We were setting ac->ac_last_group in ocfs2_claim_suballoc_bits from
res->sr_bg_blkno.  Unfortunately, res->sr_bg_blkno is going to be zero under
normal (non-fragmented) circumstances. The discontig block group patches
effectively turned off that feature. Fix this by correctly calculating what
the next group hint should be.

Acked-by: Tao Ma <tao.ma@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Tested-by: Goldwyn Rodrigues <rgoldwyn@suse.de>
Signed-off-by: Tao Ma <tao.ma@oracle.com>
2010-09-08 14:25:56 +08:00
Tao Ma 889f004a8c ocfs2: Use the right group in nfs sync check.
We have added discontig block group now, and now an inode
can be allocated in an discontig block group. So get
it in ocfs2_get_suballoc_slot_bit.

The old ocfs2_test_suballoc_bit gets group block no
from the allocation inode which is wrong. Fix it by
passing the right group.

Acked-by: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Tao Ma <tao.ma@oracle.com>
2010-09-08 14:25:56 +08:00
Jan Kara 04eda1a180 ocfs2: Flush drive's caches on fdatasync
When 'barrier' mount option is specified, we have to issue a cache flush
during fdatasync(2). We have to do this even if inode doesn't have
I_DIRTY_DATASYNC set because we still have to get written *data* to disk so
that they are not lost in case of crash.

Acked-by: Tao Ma <tao.ma@oracle.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Singed-off-by: Tao Ma <tao.ma@oracle.com>
2010-09-08 14:25:55 +08:00
Tao Ma f63afdb2c3 ocfs2: make __ocfs2_page_mkwrite handle file end properly.
__ocfs2_page_mkwrite now is broken in handling file end.
1. the last page should be the page contains i_size - 1.
2. the len in the last page is also calculated wrong.
So change them accordingly.

Acked-by: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Tao Ma <tao.ma@oracle.com>
2010-09-08 14:25:55 +08:00
Sunil Mushran f5ce5a08a4 ocfs2: Fix incorrect checksum validation error
For local mounts, ocfs2_read_locked_inode() calls ocfs2_read_blocks_sync() to
read the inode off the disk. The latter first checks to see if that block is
cached in the journal, and, if so, returns that block. That is ok.

But ocfs2_read_locked_inode() goes wrong when it tries to validate the checksum
of such blocks. Blocks that are cached in the journal may not have had their
checksum computed as yet. We should not validate the checksums of such blocks.

Fixes ossbz#1282
http://oss.oracle.com/bugzilla/show_bug.cgi?id=1282

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Cc: stable@kernel.org
Singed-off-by: Tao Ma <tao.ma@oracle.com>
2010-09-08 14:25:54 +08:00
Sunil Mushran dc696aced9 ocfs2: Fix metaecc error messages
Like tools, the checksum validate function now prints the values in hex.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Singed-off-by: Tao Ma <tao.ma@oracle.com>
2010-09-08 14:25:53 +08:00
Linus Torvalds 4f63e3c5be Merge branch 'for-2.6.36' of git://linux-nfs.org/~bfields/linux
* 'for-2.6.36' of git://linux-nfs.org/~bfields/linux:
  nfsd4: mask out non-access bits in nfs4_access_to_omode
2010-09-07 19:21:02 -07:00
Linus Torvalds fa2925cf90 Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs
* 'for-linus' of git://oss.sgi.com/xfs/xfs:
  xfs: Make fiemap work with sparse files
  xfs: prevent 32bit overflow in space reservation
  xfs: Disallow 32bit project quota id
  xfs: improve buffer cache hash scalability
2010-09-07 15:44:28 -07:00
Linus Torvalds 3c5dff7b5e Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs:
  9p: potential ERR_PTR() dereference
2010-09-07 14:38:21 -07:00
Linus Torvalds d3de0eb164 Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6:
  sysfs: checking for NULL instead of ERR_PTR
2010-09-07 14:04:59 -07:00
Linus Torvalds 4848d71569 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ryusuke/nilfs2
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ryusuke/nilfs2:
  nilfs2: fix leak of shadow dat inode in error path of load_nilfs
2010-09-07 14:01:50 -07:00
Valerie Aurora 7a2e8a8faa VFS: Sanity check mount flags passed to change_mnt_propagation()
Sanity check the flags passed to change_mnt_propagation().  Exactly
one flag should be set.  Return EINVAL otherwise.

Userspace can pass in arbitrary combinations of MS_* flags to mount().
do_change_type() is called if any of MS_SHARED, MS_PRIVATE, MS_SLAVE,
or MS_UNBINDABLE is set.  do_change_type() clears MS_REC and then
calls change_mnt_propagation() with the rest of the user-supplied
flags.  change_mnt_propagation() clearly assumes only one flag is set
but do_change_type() does not check that this is true.  For example,
mount() with flags MS_SHARED | MS_RDONLY does not actually make the
mount shared or read-only but does clear MNT_UNBINDABLE.

Signed-off-by: Valerie Aurora <vaurora@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-09-07 13:46:20 -07:00
Miklos Szeredi b9ca67b2dd fuse: fix lock annotations
Sparse doesn't understand lock annotations of the form
__releases(&foo->lock).  Change them to __releases(foo->lock).  Same
for __acquires().

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2010-09-07 13:42:41 +02:00
Miklos Szeredi 595afaf9e6 fuse: flush background queue on connection close
David Bartly reported that fuse can hang in fuse_get_req_nofail() when
the connection to the filesystem server is no longer active.

If bg_queue is not empty then flush_bg_queue() called from
request_end() can put more requests on to the pending queue.  If this
happens while ending requests on the processing queue then those
background requests will be queued to the pending list and never
ended.

Another problem is that fuse_dev_release() didn't wake up processes
sleeping on blocked_waitq.

Solve this by:

 a) flushing the background queue before calling end_requests() on the
    pending and processing queues

 b) setting blocked = 0 and waking up processes waiting on
    blocked_waitq()

Thanks to David for an excellent bug report.

Reported-by: David Bartley <andareed@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
CC: stable@kernel.org
2010-09-07 13:42:41 +02:00
Dan Carpenter 57f9bdac25 sysfs: checking for NULL instead of ERR_PTR
d_path() returns an ERR_PTR and it doesn't return NULL.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Cc: stable <stable@kernel.org>
Reviewed-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-09-03 17:26:28 -07:00
Alex Elder cb7a93412a Merge branch '2.6.36-xfs-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/dgc/xfsdev 2010-09-03 09:02:32 -05:00
Tao Ma 9af2546508 xfs: Make fiemap work with sparse files
In xfs_vn_fiemap, we set bvm_count to fi_extent_max + 1 and want
to return fi_extent_max extents, but actually it won't work for
a sparse file. The reason is that in xfs_getbmap we will
calculate holes and set it in 'out', while out is malloced by
bmv_count(fi_extent_max+1) which didn't consider holes. So in the
worst case, if 'out' vector looks like
[hole, extent, hole, extent, hole, ... hole, extent, hole],
we will only return half of fi_extent_max extents.

This patch add a new parameter BMV_IF_NO_HOLES for bvm_iflags.
So with this flags, we don't use our 'out' in xfs_getbmap for
a hole. The solution is a bit ugly by just don't increasing
index of 'out' vector. I felt that it is not easy to skip it
at the very beginning since we have the complicated check and
some function like xfs_getbmapx_fix_eof_hole to adjust 'out'.

Cc: Dave Chinner <david@fromorbit.com>
Signed-off-by: Tao Ma <tao.ma@oracle.com>
Signed-off-by: Alex Elder <aelder@sgi.com>
2010-09-03 09:02:11 -05:00
Dave Chinner 72656c46f5 xfs: prevent 32bit overflow in space reservation
If we attempt to preallocate more than 2^32 blocks of space in a
single syscall, the transaction block reservation will overflow
leading to a hangs in the superblock block accounting code. This
is trivially reproduced with xfs_io. Fix the problem by capping the
allocation reservation to the maximum number of blocks a single
xfs_bmapi() call can allocate (2^21 blocks).

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
2010-09-03 12:19:33 +10:00
J. Bruce Fields 8f34a430ac nfsd4: mask out non-access bits in nfs4_access_to_omode
This fixes an unnecessary BUG().

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2010-09-02 15:25:09 -04:00
Arkadiusz Mi?kiewicz 23963e54ce xfs: Disallow 32bit project quota id
Currently on-disk structure is able to keep only 16bit project quota
id, so disallow 32bit ones. This fixes a problem where parts of
kernel structures holding project quota id are 32bit while parts
(on-disk) are 16bit variables which causes project quota member
files to be inaccessible for some operations (like mv/rm).

Signed-off-by: Arkadiusz Mi?kiewicz <arekm@maven.pl>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
2010-09-02 10:29:08 -05:00
Dave Chinner 9bc08a45fb xfs: improve buffer cache hash scalability
When doing large parallel file creates on a 16p machines, large amounts of
time is being spent in _xfs_buf_find(). A system wide profile with perf top
shows this:

          1134740.00 19.3% _xfs_buf_find
           733142.00 12.5% __ticket_spin_lock

The problem is that the hash contains 45,000 buffers, and the hash table width
is only 256 buffers. That means we've got around 200 buffers per chain, and
searching it is quite expensive. The hash table size needs to increase.

Secondly, every time we do a lookup, we promote the buffer we find to the head
of the hash chain. This is causing cachelines to be dirtied and causes
invalidation of cachelines across all CPUs that may have walked the hash chain
recently. hence every walk of the hash chain is effectively a cold cache walk.
Remove the promotion to avoid this invalidation.

The results are:

          1045043.00 21.2% __ticket_spin_lock
           326184.00  6.6% _xfs_buf_find

A 70% drop in the CPU usage when looking up buffers. Unfortunately that does
not result in an increase in performance underthis workload as contention on
the inode_lock soaks up most of the reduction in CPU usage.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
2010-09-02 15:14:38 +10:00
Dan Carpenter 8f587df479 9p: potential ERR_PTR() dereference
p9_client_walk() can return error values if we run out of space or there
is a problem with the network.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2010-08-30 10:35:28 -05:00
Ryusuke Konishi 4afc31345e nilfs2: fix leak of shadow dat inode in error path of load_nilfs
If load_nilfs() gets an error while doing recovery, it will fail to
free the shadow inode of dat (nilfs->ns_gc_dat).

This fixes the leak issue.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2010-08-30 10:18:03 +09:00
Linus Torvalds 30c0f6a049 Merge branch 'for-linus' of git://git.infradead.org/users/eparis/notify
* 'for-linus' of git://git.infradead.org/users/eparis/notify:
  fsnotify: drop two useless bools in the fnsotify main loop
  fsnotify: fix list walk order
  fanotify: Return EPERM when a process is not privileged
  fanotify: resize pid and reorder structure
  fanotify: drop duplicate pr_debug statement
  fanotify: flush outstanding perm requests on group destroy
  fsnotify: fix ignored mask handling between inode and vfsmount marks
  fanotify: add MAINTAINERS entry
  fsnotify: reset used_inode and used_vfsmount on each pass
  fanotify: do not dereference inode_mark when it is unset
2010-08-28 14:11:04 -07:00
Linus Torvalds e933424c48 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ecryptfs/ecryptfs-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ecryptfs/ecryptfs-2.6:
  eCryptfs: Fix encrypted file name lookup regression
  ecryptfs: properly mark init functions
  fs/ecryptfs: Return -ENOMEM on memory allocation failure
2010-08-28 14:10:43 -07:00
Linus Torvalds 997396a73a Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client:
  ceph: fix get_ticket_handler() error handling
  ceph: don't BUG on ENOMEM during mds reconnect
  ceph: ceph_mdsc_build_path() returns an ERR_PTR
  ceph: Fix warnings
  ceph: ceph_get_inode() returns an ERR_PTR
  ceph: initialize fields on new dentry_infos
  ceph: maintain i_head_snapc when any caps are dirty, not just for data
  ceph: fix osd request lru adjustment when sending request
  ceph: don't improperly set dir complete when holding EXCL cap
  mm: exporting account_page_dirty
  ceph: direct requests in snapped namespace based on nonsnap parent
  ceph: queue cap snap writeback for realm children on snap update
  ceph: include dirty xattrs state in snapped caps
  ceph: fix xattr cap writeback
  ceph: fix multiple mds session shutdown
2010-08-28 14:07:20 -07:00
Linus Torvalds 2547d1d20f Merge branch 'for-2.6.36' of git://linux-nfs.org/~bfields/linux
* 'for-2.6.36' of git://linux-nfs.org/~bfields/linux:
  nfsd: fix NULL dereference in nfsd_statfs()
  nfsd4: fix downgrade/lock logic
  nfsd4: typo fix in find_any_file
  nfsd4: bad BUG() in preprocess_stateid_op
2010-08-28 14:05:55 -07:00
J. Bruce Fields b76b4014f9 writeback: Fix lost wake-up shutting down writeback thread
Setting the task state here may cause us to miss the wake up from
kthread_stop(), so we need to recheck kthread_should_stop() or risk
sleeping forever in the following schedule().

Symptom was an indefinite hang on an NFSv4 mount.  (NFSv4 may create
multiple mounts in a temporary namespace while traversing the mount
path, and since the temporary namespace is immediately destroyed, it may
end up destroying a mount very soon after it was created, possibly
making this race more likely.)

INFO: task mount.nfs4:4314 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
mount.nfs4    D 0000000000000000  2880  4314   4313 0x00000000
 ffff88001ed6da28 0000000000000046 ffff88001ed6dfd8 ffff88001ed6dfd8
 ffff88001ed6c000 ffff88001ed6c000 ffff88001ed6c000 ffff88001e5003a0
 ffff88001ed6dfd8 ffff88001e5003a8 ffff88001ed6c000 ffff88001ed6dfd8
Call Trace:
 [<ffffffff8196090d>] schedule_timeout+0x1cd/0x2e0
 [<ffffffff8106a31c>] ? mark_held_locks+0x6c/0xa0
 [<ffffffff819639a0>] ? _raw_spin_unlock_irq+0x30/0x60
 [<ffffffff8106a5fd>] ? trace_hardirqs_on_caller+0x14d/0x190
 [<ffffffff819671fe>] ? sub_preempt_count+0xe/0xd0
 [<ffffffff8195fc80>] wait_for_common+0x120/0x190
 [<ffffffff81033c70>] ? default_wake_function+0x0/0x20
 [<ffffffff8195fdcd>] wait_for_completion+0x1d/0x20
 [<ffffffff810595fa>] kthread_stop+0x4a/0x150
 [<ffffffff81061a60>] ? thaw_process+0x70/0x80
 [<ffffffff810cc68a>] bdi_unregister+0x10a/0x1a0
 [<ffffffff81229dc9>] nfs_put_super+0x19/0x20
 [<ffffffff810ee8c4>] generic_shutdown_super+0x54/0xe0
 [<ffffffff810ee9b6>] kill_anon_super+0x16/0x60
 [<ffffffff8122d3b9>] nfs4_kill_super+0x39/0x90
 [<ffffffff810eda45>] deactivate_locked_super+0x45/0x60
 [<ffffffff810edfb9>] deactivate_super+0x49/0x70
 [<ffffffff81108294>] mntput_no_expire+0x84/0xe0
 [<ffffffff811084ef>] release_mounts+0x9f/0xc0
 [<ffffffff81108575>] put_mnt_ns+0x65/0x80
 [<ffffffff8122cc56>] nfs_follow_remote_path+0x1e6/0x420
 [<ffffffff8122cfbf>] nfs4_try_mount+0x6f/0xd0
 [<ffffffff8122d0c2>] nfs4_get_sb+0xa2/0x360
 [<ffffffff810edcb8>] vfs_kern_mount+0x88/0x1f0
 [<ffffffff810ede92>] do_kern_mount+0x52/0x130
 [<ffffffff81963d9a>] ? _lock_kernel+0x6a/0x170
 [<ffffffff81108e9e>] do_mount+0x26e/0x7f0
 [<ffffffff81106b3a>] ? copy_mount_options+0xea/0x190
 [<ffffffff811094b8>] sys_mount+0x98/0xf0
 [<ffffffff810024d8>] system_call_fastpath+0x16/0x1b
1 lock held by mount.nfs4/4314:
 #0:  (&type->s_umount_key#24){+.+...}, at: [<ffffffff810edfb1>] deactivate_super+0x41/0x70

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Acked-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2010-08-28 08:52:10 +02:00