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  1. 07 3月, 2013 1 次提交
  3. 06 3月, 2013 1 次提交
  5. 05 3月, 2013 10 次提交
  7. 03 3月, 2013 1 次提交
  9. 02 3月, 2013 2 次提交
    • P
      btrfs: fixup/remove module.h usage as required · 180e001c
      由 Paul Gortmaker 提交于 
      We want to avoid module.h where posible, since it in turn includes
nearly all of header space.  This means removing it where it is not
required, and using export.h where we are only exporting symbols via
EXPORT_SYMBOL and friends.
Signed-off-by: NPaul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: NChris Mason <chris.mason@fusionio.com>
      180e001c
    • J
      Btrfs: delete inline extents when we find them during logging · 124fe663
      由 Josef Bacik 提交于 
      Apparently when we do inline extents we allow the data to overlap the last chunk
of the btrfs_file_extent_item, which means that we can possibly have a
btrfs_file_extent_item that isn't actually as large as a btrfs_file_extent_item.
This messes with us when we try to overwrite the extent when logging new extents
since we expect for it to be the right size.  To fix this just delete the item
and try to do the insert again which will give us the proper sized
btrfs_file_extent_item.  This fixes a panic where map_private_extent_buffer
would blow up because we're trying to write past the end of the leaf.  Thanks,

Cc: stable@vger.kernel.org
Signed-off-by: NJosef Bacik <jbacik@fusionio.com>
      124fe663
  11. 01 3月, 2013 14 次提交
  13. 27 2月, 2013 5 次提交
    • Q
      btrfs: cleanup for open-coded alignment · fda2832f
      由 Qu Wenruo 提交于 
      Though most of the btrfs codes are using ALIGN macro for page alignment,
there are still some codes using open-coded alignment like the
following:
------
        u64 mask = ((u64)root->stripesize - 1);
        u64 ret = (val + mask) & ~mask;
------
Or even hidden one:
------
        num_bytes = (end - start + blocksize) & ~(blocksize - 1);
------

Sometimes these open-coded alignment is not so easy to understand for
newbie like me.

This commit changes the open-coded alignment to the ALIGN macro for a
better readability.

Also there is a previous patch from David Sterba with similar changes,
but the patch is for 3.2 kernel and seems not merged.
http://www.spinics.net/lists/linux-btrfs/msg12747.html

Cc: David Sterba <dave@jikos.cz>
Signed-off-by: NQu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: NJosef Bacik <jbacik@fusionio.com>
      fda2832f
    • L
      Btrfs: do not change inode flags in rename · 8c4ce81e
      由 Liu Bo 提交于 
      Before we forced to change a file's NOCOW and COMPRESS flag due to
the parent directory's, but this ends up a bad idea, because it
confuses end users a lot about file's NOCOW status, eg. if someone
change a file to NOCOW via 'chattr' and then rename it in the current
directory which is without NOCOW attribute, the file will lose the
NOCOW flag silently.

This diables 'change flags in rename', so from now on we'll only
inherit flags from the parent directory on creation stage while in
other places we can use 'chattr' to set NOCOW or COMPRESS flags.
Reported-by: NMarios Titas <redneb8888@gmail.com>
Signed-off-by: NLiu Bo <bo.li.liu@oracle.com>
Reviewed-by: NDavid Sterba <dsterba@suse.cz>
Signed-off-by: NJosef Bacik <jbacik@fusionio.com>
      8c4ce81e
    • L
      Btrfs: use reserved space for creating a snapshot · 2382c5cc
      由 Liu Bo 提交于 
      While inserting dir index and updating inode for a snapshot, we'd
add delayed items which consume trans->block_rsv, if we don't have
any space reserved in this trans handle, we either just return or
reserve space again.

But before creating pending snapshots during committing transaction,
we've done a release on this trans handle, so we don't have space reserved
in it at this stage.

What we're using is block_rsv of pending snapshots which has already
reserved well enough space for both inserting dir index and updating
inode, so we need to set trans handle to indicate that we have space
now.
Signed-off-by: NLiu Bo <bo.li.liu@oracle.com>
Reviewed-by: NMiao Xie <miaox@cn.fujitsu.com>
Signed-off-by: NJosef Bacik <jbacik@fusionio.com>
      2382c5cc
    • A
      clear chunk_alloc flag on retryable failure · a81cb9a2
      由 Alexandre Oliva 提交于 
      I've experienced filesystem freezes with permanent spikes in the active
process count for quite a while, particularly on filesystems whose
available raw space has already been fully allocated to chunks.

While looking into this, I found a pretty obvious error in
do_chunk_alloc: it sets space_info->chunk_alloc, but if
btrfs_alloc_chunk returns an error other than ENOSPC, it returns leaving
that flag set, which causes any other threads waiting for
space_info->chunk_alloc to become zero to spin indefinitely.

I haven't double-checked that this patch fixes the failure I've observed
fully (it's not exactly trivial to trigger), but it surely is a bug and
the fix is trivial, so...  Please put it in :-)

What I saw in that function also happens to explain why in some cases I
see filesystems allocate a huge number of chunks that remain unused
(leading to the scenario above, of not having more chunks to allocate).
It happens for data and metadata, but not necessarily both.  I'm
guessing some thread sets the force_alloc flag on the corresponding
space_info, and then several threads trying to get disk space end up
attempting to allocate a new chunk concurrently.  All of them will see
the force_alloc flag and bump their local copy of force up to the level
they see first, and they won't clear it even if another thread succeeds
in allocating a chunk, thus clearing the force flag.  Then each thread
that observed the force flag will, on its turn, force the allocation of
a new chunk.  And any threads that come in while it does that will see
the force flag still set and pick it up, and so on.  This sounds like a
problem to me, but...  what should the correct behavior be?  Clear
force_flag once we copy it to a local force?  Reset force to the
incoming value on every loop?  Set the flag to our incoming force if we
have it at first, clear our local flag, and move it from the space_info
when we determined that we are the thread that's going to perform the
allocation?

btrfs: clear chunk_alloc flag on retryable failure

From: Alexandre Oliva <oliva@gnu.org>

If btrfs_alloc_chunk fails with e.g. ENOMEM, we exit do_chunk_alloc
without clearing chunk_alloc in space_info.  As a result, any further
calls to do_chunk_alloc on that filesystem will start busy-waiting for
chunk_alloc to be cleared, but it never will be.  This patch adjusts
do_chunk_alloc so that it clears this flag in case of an error.
Signed-off-by: NAlexandre Oliva <oliva@gnu.org>
Signed-off-by: NJosef Bacik <jbacik@fusionio.com>
      a81cb9a2
    • J
      Btrfs: fix backref walking race with tree deletions · ca60ebfa
      由 Jan Schmidt 提交于 
      When a subvolume is removed, we remove the root item from the root tree,
while the tree blocks and backrefs remain for a while. When backref walking
comes across one of those orphan tree blocks, it can find a backref for a
no longer existing root. This is all good, we only must tolerate
__resolve_indirect_ref returning an error and continue with the good refs
found.
Reported-by: NAlex Lyakas <alex.btrfs@zadarastorage.com>
Signed-off-by: NJan Schmidt <list.btrfs@jan-o-sch.net>
Signed-off-by: NJosef Bacik <jbacik@fusionio.com>
      ca60ebfa
  15. 26 2月, 2013 1 次提交
    • J
      Btrfs: make sure NODATACOW also gets NODATASUM set · f2bdf9a8
      由 Josef Bacik 提交于 
      A user reported hitting the BUG_ON() in btrfs_finished_ordered_io() where we had
csums on a NOCOW extent.  This can happen if we have NODATACOW set but not
NODATASUM set, which can happen in two cases, either we mount with -o nodatacow
and then write into preallocated space, or chattr +C a directory and move a file
into that directory.  Liu has fixed the move case in a different place, but this
fixes the mount -o nodatacow case.  Thanks,
Signed-off-by: NJosef Bacik <jbacik@fusionio.com>
      f2bdf9a8
  17. 21 2月, 2013 5 次提交
    • M
      Btrfs: fix remount vs autodefrag · dc81cdc5
      由 Miao Xie 提交于 
      If we remount the fs to close the auto defragment or make the fs R/O,
we should stop the auto defragment.
Signed-off-by: NMiao Xie <miaox@cn.fujitsu.com>
Signed-off-by: NChris Mason <chris.mason@fusionio.com>
      dc81cdc5
    • M
      Btrfs: fix wrong outstanding_extents when doing DIO write · 172a5049
      由 Miao Xie 提交于 
      When running the 083th case of xfstests on the filesystem with
"compress-force=lzo", the following WARNINGs were triggered.
  WARNING: at fs/btrfs/inode.c:7908
  WARNING: at fs/btrfs/inode.c:7909
  WARNING: at fs/btrfs/inode.c:7911
  WARNING: at fs/btrfs/extent-tree.c:4510
  WARNING: at fs/btrfs/extent-tree.c:4511

This problem was introduced by the patch "Btrfs: fix deadlock due
to unsubmitted". In this patch, there are two bugs which caused
the above problem.

The 1st one is a off-by-one bug, if the DIO write return 0, it is
also a short write, we need release the reserved space for it. But
we didn't do it in that patch. Fix it by change "ret > 0" to
"ret >= 0".

The 2nd one is ->outstanding_extents was increased twice when
a short write happened. As we know, ->outstanding_extents is
a counter to keep track of the number of extent items we may
use duo to delalloc, when we reserve the free space for a
delalloc write, we assume that the write will introduce just
one extent item, so we increase ->outstanding_extents by 1 at
that time. And then we will increase it every time we split the
write, it is done at the beginning of btrfs_get_blocks_direct().
So when a short write happens, we needn't increase
->outstanding_extents again. But this patch done.

In order to fix the 2nd problem, I re-write the logic for
->outstanding_extents operation. We don't increase it at the
beginning of btrfs_get_blocks_direct(), instead, we just
increase it when the split actually happens.
Reported-by: NMitch Harder <mitch.harder@sabayonlinux.org>
Signed-off-by: NMiao Xie <miaox@cn.fujitsu.com>
Signed-off-by: NChris Mason <chris.mason@fusionio.com>
      172a5049
    • L
      Btrfs: snapshot-aware defrag · 38c227d8
      由 Liu Bo 提交于 
      This comes from one of btrfs's project ideas,
As we defragment files, we break any sharing from other snapshots.
The balancing code will preserve the sharing, and defrag needs to grow this
as well.

Now we're able to fill the blank with this patch, in which we make full use of
backref walking stuff.

Here is the basic idea,
o  set the writeback ranges started by defragment with flag EXTENT_DEFRAG
o  at endio, after we finish updating fs tree, we use backref walking to find
   all parents of the ranges and re-link them with the new COWed file layout by
   adding corresponding backrefs.
Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com>
Signed-off-by: NLiu Bo <bo.li.liu@oracle.com>
Signed-off-by: NChris Mason <chris.mason@fusionio.com>
      38c227d8
    • C
      Btrfs: fix max chunk size on raid5/6 · 86db2578
      由 Chris Mason 提交于 
      We try to limit the size of a chunk to 10GB, which keeps the unit of
work reasonable during balance and resize operations.  The limit checks
were taking into account the number of copies of the data we had but
what they really should be doing is comparing against the logical
size of the chunk we're creating.

This moves the code around a little to use the count of data stripes
from raid5/6.
Signed-off-by: NChris Mason <chris.mason@fusionio.com>
      86db2578
    • Z
      btrfs: limit fallocate extent reservation to 256MB · 24542bf7
      由 Zach Brown 提交于 
      Very large fallocate requests are cpu bound and result in extents with a
repeating pattern of ever decreasing size:

$ time fallocate -l 1T file
real	0m13.039s

( an excerpt of the extents from btrfs-debug-tree: )
  prealloc data disk byte 1536292564992 nr 397312
  prealloc data disk byte 1536292962304 nr 196608
  prealloc data disk byte 1536293158912 nr 98304
  prealloc data disk byte 1536293257216 nr 49152
  prealloc data disk byte 1536293306368 nr 24576
  prealloc data disk byte 1536293330944 nr 12288
  prealloc data disk byte 1536293343232 nr 8192
  prealloc data disk byte 1536293351424 nr 4096
  prealloc data disk byte 1536293355520 nr 4096
  prealloc data disk byte 1536293359616 nr 4096

The excessive cpu use comes from __btrfs_prealloc_file_range() trying to
allocate the entire remaining size after each extent is allocated.
btrfs_reserve_extent() repeatedly cuts this requested size in half until
it gets down to the size that the allocators can return.  We limit the
problem for now by capping each reservation at 256 meg.

The small extents come from a masking bug when decreasing the requested
reservation size.  The high 32bits are cleared and the remaining low
bits might happen to reserve a small size.   Fix this by using
round_down() which properly casts the mask.

After these fixes huge fallocate requests are fast and result in nice
large extents:

$ time fallocate -l 1T file
real	0m0.082s

  prealloc data disk byte 1112425889792 nr 268435456
  prealloc data disk byte 1112694325248 nr 268435456
  prealloc data disk byte 1112962760704 nr 268435456
Reported-by: NEric Sandeen <sandeen@redhat.com>
Signed-off-by: NZach Brown <zab@redhat.com>
Signed-off-by: NChris Mason <chris.mason@fusionio.com>
      24542bf7