Commit Graph

231 Commits

Author SHA1 Message Date
Mark Fasheh ce598979be btrfs: Don't BUG_ON errors from btrfs_create_subvol_root()
This is called from only one place - create_subvol() which passes errors
safely back out to it's caller, btrfs_mksubvol where they are handled.

Additionally, btrfs_create_subvol_root() itself bug's needlessly from error
return of btrfs_update_inode(). Since create_subvol() was fixed to catch
errors we can bubble this one up too.

Signed-off-by: Mark Fasheh <mfasheh@suse.com>
2012-03-22 01:45:36 +01:00
Jeff Mahoney d0082371cf btrfs: drop gfp_t from lock_extent
lock_extent and unlock_extent are always called with GFP_NOFS, drop the
 argument and use GFP_NOFS consistently.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
2012-03-22 01:45:35 +01:00
Linus Torvalds 855a85f704 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs
Quoth Chris:
 "This is later than I wanted because I got backed up running through
  btrfs bugs from the Oracle QA teams.  But they are all bug fixes that
  we've queued and tested since rc1.

  Nothing in particular stands out, this just reflects bug fixing and QA
  done in parallel by all the btrfs developers.  The most user visible
  of these is:

    Btrfs: clear the extent uptodate bits during parent transid failures

  Because that helps deal with out of date drives (say an iscsi disk
  that has gone away and come back).  The old code wasn't always
  properly retrying the other mirror for this type of failure."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs: (24 commits)
  Btrfs: fix compiler warnings on 32 bit systems
  Btrfs: increase the global block reserve estimates
  Btrfs: clear the extent uptodate bits during parent transid failures
  Btrfs: add extra sanity checks on the path names in btrfs_mksubvol
  Btrfs: make sure we update latest_bdev
  Btrfs: improve error handling for btrfs_insert_dir_item callers
  Btrfs: be less strict on finding next node in clear_extent_bit
  Btrfs: fix a bug on overcommit stuff
  Btrfs: kick out redundant stuff in convert_extent_bit
  Btrfs: skip states when they does not contain bits to clear
  Btrfs: check return value of lookup_extent_mapping() correctly
  Btrfs: fix deadlock on page lock when doing auto-defragment
  Btrfs: fix return value check of extent_io_ops
  btrfs: honor umask when creating subvol root
  btrfs: silence warning in raid array setup
  btrfs: fix structs where bitfields and spinlock/atomic share 8B word
  btrfs: delalloc for page dirtied out-of-band in fixup worker
  Btrfs: fix memory leak in load_free_space_cache()
  btrfs: don't check DUP chunks twice
  Btrfs: fix trim 0 bytes after a device delete
  ...
2012-02-24 09:02:53 -08:00
Chris Mason 16780cabb8 Btrfs: add extra sanity checks on the path names in btrfs_mksubvol
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2012-02-23 10:43:45 -05:00
Miao Xie 600a45e1d5 Btrfs: fix deadlock on page lock when doing auto-defragment
When I ran xfstests circularly on a auto-defragment btrfs, the deadlock
happened.

Steps to reproduce:
[tty0]
 # export MOUNT_OPTIONS="-o autodefrag"
 # export TEST_DEV=<partition1>
 # export TEST_DIR=<mountpoint1>
 # export SCRATCH_DEV=<partition2>
 # export SCRATCH_MNT=<mountpoint2>
 # while [ 1 ]
 > do
 > ./check 091 127 263
 > sleep 1
 > done
[tty1]
 # while [ 1 ]
 > do
 > echo 3 > /proc/sys/vm/drop_caches
 > done

Several hours later, the test processes will hang on, and the deadlock will
happen on page lock.

The reason is that:
  Auto defrag task		Flush thread			Test task
				btrfs_writepages()
				  add ordered extent
				  (including page 1, 2)
				  set page 1 writeback
				  set page 2 writeback
				endio_fn()
				  end page 2 writeback
								release page 2
lock page 1
alloc and lock page 2
page 2 is not uptodate
  btrfs_readpage()
    start ordered extent()
    btrfs_writepages()
      try  to lock page 1

so deadlock happens.

Fix this bug by unlocking the page which is in writeback, and re-locking it
after the writeback end.

Signed-off-by: Miao Xie <miax@cn.fujitsu.com>
2012-02-16 17:23:16 +01:00
Linus Torvalds 67d2433ee7 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  Btrfs: fix reservations in btrfs_page_mkwrite
  Btrfs: advance window_start if we're using a bitmap
  btrfs: mask out gfp flags in releasepage
  Btrfs: fix enospc error caused by wrong checks of the chunk
  Btrfs: do not defrag a file partially
  Btrfs: fix warning for 32-bit build of fs/btrfs/check-integrity.c
  Btrfs: use cluster->window_start when allocating from a cluster bitmap
  Btrfs: Check for NULL page in extent_range_uptodate
  btrfs: Fix busyloops in transaction waiting code
  Btrfs: make sure a bitmap has enough bytes
  Btrfs: fix uninit warning in backref.c
2012-01-28 17:00:19 -08:00
Liu Bo 7ec31b548a Btrfs: do not defrag a file partially
xfstests 218 complains that btrfs defrags a file partially:
 After: 1
 Write backwards sync, but contiguous - should defrag to 1 extent
 Before: 10
-After: 1
+After: 2

To fix this, we need to set max_to_defrag count properly.

Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2012-01-26 15:01:12 -05:00
Linus Torvalds d65773b22b Merge branch 'btrfs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
* 'btrfs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  btrfs: take allocation of ->tree_root into open_ctree()
  btrfs: let ->s_fs_info point to fs_info, not root...
  btrfs: consolidate failure exits in btrfs_mount() a bit
  btrfs: make free_fs_info() call ->kill_sb() unconditional
  btrfs: merge free_fs_info() calls on fill_super failures
  btrfs: kill pointless reassignment of ->s_fs_info in btrfs_fill_super()
  btrfs: make open_ctree() return int
  btrfs: sanitizing ->fs_info, part 5
  btrfs: sanitizing ->fs_info, part 4
  btrfs: sanitizing ->fs_info, part 3
  btrfs: sanitizing ->fs_info, part 2
  btrfs: sanitizing ->fs_info, part 1
  btrfs: fix a deadlock in btrfs_scan_one_device()
  btrfs: fix mount/umount race
  btrfs: get ->kill_sb() of its own
  btrfs: preparation to fixing mount/umount race
2012-01-17 15:52:51 -08:00
Linus Torvalds f9156c7288 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs: (62 commits)
  Btrfs: use larger system chunks
  Btrfs: add a delalloc mutex to inodes for delalloc reservations
  Btrfs: space leak tracepoints
  Btrfs: protect orphan block rsv with spin_lock
  Btrfs: add allocator tracepoints
  Btrfs: don't call btrfs_throttle in file write
  Btrfs: release space on error in page_mkwrite
  Btrfs: fix btrfsck error 400 when truncating a compressed
  Btrfs: do not use btrfs_end_transaction_throttle everywhere
  Btrfs: add balance progress reporting
  Btrfs: allow for resuming restriper after it was paused
  Btrfs: allow for canceling restriper
  Btrfs: allow for pausing restriper
  Btrfs: add skip_balance mount option
  Btrfs: recover balance on mount
  Btrfs: save balance parameters to disk
  Btrfs: soft profile changing mode (aka soft convert)
  Btrfs: implement online profile changing
  Btrfs: do not reduce profile in do_chunk_alloc()
  Btrfs: virtual address space subset filter
  ...

Fix up trivial conflict in fs/btrfs/ioctl.c due to the use of the new
mnt_drop_write_file() helper.
2012-01-17 15:49:54 -08:00
Josef Bacik f248679e86 Btrfs: add a delalloc mutex to inodes for delalloc reservations
I was using i_mutex for this, but we're getting bogus lockdep warnings by doing
that and theres no real way to get rid of those, so just stop using i_mutex to
protect delalloc metadata reservations and use a delalloc mutex instead.  This
shouldn't be contended often at all, only if you are writing and mmap writing to
the file at the same time.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
2012-01-16 15:29:43 -05:00
Chris Mason 9785dbdf26 Merge branch 'for-chris' of git://git.jan-o-sch.net/btrfs-unstable into integration 2012-01-16 15:26:31 -05:00
Chris Mason d756bd2d93 Merge branch 'for-chris' of git://repo.or.cz/linux-btrfs-devel into integration
Conflicts:
	fs/btrfs/volumes.c

Signed-off-by: Chris Mason <chris.mason@oracle.com>
2012-01-16 15:26:17 -05:00
Ilya Dryomov 19a39dce3b Btrfs: add balance progress reporting
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2012-01-16 22:04:49 +02:00
Ilya Dryomov de322263d3 Btrfs: allow for resuming restriper after it was paused
Recognize BTRFS_BALANCE_RESUME flag passed from userspace.  We use the
same heuristics used when recovering balance after a crash to try to
start where we left off last time.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2012-01-16 22:04:49 +02:00
Ilya Dryomov a7e99c691a Btrfs: allow for canceling restriper
Implement an ioctl for canceling restriper.  Currently we wait until
relocation of the current block group is finished, in future this can be
done by triggering a commit.  Balance item is deleted and no memory
about the interrupted balance is kept.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2012-01-16 22:04:49 +02:00
Ilya Dryomov 837d5b6e46 Btrfs: allow for pausing restriper
Implement an ioctl for pausing restriper.  This pauses the relocation,
but balance is still considered to be "in progress": balance item is
not deleted, other volume operations cannot be started, etc.  If paused
in the middle of profile changing operation we will continue making
allocations with the target profile.

Add a hook to close_ctree() to pause restriper and free its data
structures on unmount.  (It's safe to unmount when restriper is in
"paused" state, we will resume with the same parameters on the next
mount)

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2012-01-16 22:04:49 +02:00
Ilya Dryomov f43ffb60fd Btrfs: add basic infrastructure for selective balancing
This allows to have a separate set of filters for each chunk type
(data,meta,sys).  The code however is generic and switch on chunk type
is only done once.

This commit also adds a type filter: it allows to balance for example
meta and system chunks w/o touching data ones.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2012-01-16 22:04:47 +02:00
Ilya Dryomov c9e9f97bdf Btrfs: add basic restriper infrastructure
Add basic restriper infrastructure: extended balancing ioctl and all
related ioctl data structures, add data structure for tracking
restriper's state to fs_info, etc.  The semantics of the old balancing
ioctl are fully preserved.

Explicitly disallow any volume operations when balance is in progress.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2012-01-16 22:04:47 +02:00
Li Zefan 4da6f1a332 Btrfs: reserve metadata space in btrfs_ioctl_setflags()
Check and reserve space for btrfs_update_inode().

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
2012-01-11 10:26:39 +08:00
Li Zefan f062abf089 Btrfs: remove BUG_ON()s in btrfs_ioctl_setflags()
We can recover from errors and return -errno to user space.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
2012-01-11 10:26:38 +08:00
Al Viro 815745cf3e btrfs: let ->s_fs_info point to fs_info, not root...
the latter can be obtained from the former (by looking as ->tree_root)
just as cheaply as we currently are doing the other way round.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-08 19:35:37 -05:00
Jan Schmidt 4692cf58aa Btrfs: new backref walking code
The old backref iteration code could only safely be used on commit roots.
Besides this limitation, it had bugs in finding the roots for these
references. This commit replaces large parts of it by btrfs_find_all_roots()
which a) really finds all roots and the correct roots, b) works correctly
under heavy file system load, c) considers delayed refs.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
2012-01-05 10:49:43 +01:00
Al Viro 2a79f17e4a vfs: mnt_drop_write_file()
new helper (wrapper around mnt_drop_write()) to be used in pair with
mnt_want_write_file().

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-03 22:52:40 -05:00
Al Viro a561be7100 switch a bunch of places to mnt_want_write_file()
it's both faster (in case when file has been opened for write) and cleaner.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-03 22:52:35 -05:00
Arne Jansen 66d7e7f09f Btrfs: mark delayed refs as for cow
Add a for_cow parameter to add_delayed_*_ref and pass the appropriate value
from every call site. The for_cow parameter will later on be used to
determine if a ref will change anything with respect to qgroups.

Delayed refs coming from relocation are always counted as for_cow, as they
don't change subvol quota.

Also pass in the fs_info for later use.

btrfs_find_all_roots() will use this as an optimization, as changes that are
for_cow will not change anything with respect to which root points to a
certain leaf. Thus, we don't need to add the current sequence number to
those delayed refs.

Signed-off-by: Arne Jansen <sensille@gmx.net>
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
2011-12-22 16:22:27 +01:00
Chris Mason 567a45e917 Merge branch 'for-chris' of http://git.kernel.org/pub/scm/linux/kernel/git/josef/btrfs-work into integration
Conflicts:
	fs/btrfs/inode.c

Signed-off-by: Chris Mason <chris.mason@oracle.com>
2011-12-15 13:43:49 -05:00
Josef Bacik 660d3f6cde Btrfs: fix how we do delalloc reservations and how we free reservations on error
Running xfstests 269 with some tracing my scripts kept spitting out errors about
releasing bytes that we didn't actually have reserved.  This took me down a huge
rabbit hole and it turns out the way we deal with reserved_extents is wrong,
we need to only be setting it if the reservation succeeds, otherwise the free()
method will come in and unreserve space that isn't actually reserved yet, which
can lead to other warnings and such.  The math was all working out right in the
end, but it caused all sorts of other issues in addition to making my scripts
yell and scream and generally make it impossible for me to track down the
original issue I was looking for.  The other problem is with our error handling
in the reservation code.  There are two cases that we need to deal with

1) We raced with free.  In this case free won't free anything because csum_bytes
is modified before we dro the lock in our reservation path, so free rightly
doesn't release any space because the reservation code may be depending on that
reservation.  However if we fail, we need the reservation side to do the free at
that point since that space is no longer in use.  So as it stands the code was
doing this fine and it worked out, except in case #2

2) We don't race with free.  Nobody comes in and changes anything, and our
reservation fails.  In this case we didn't reserve anything anyway and we just
need to clean up csum_bytes but not free anything.  So we keep track of
csum_bytes before we drop the lock and if it hasn't changed we know we can just
decrement csum_bytes and carry on.

Because of the case where we can race with free()'s since we have to drop our
spin_lock to do the reservation, I'm going to serialize all reservations with
the i_mutex.  We already get this for free in the heavy use paths, truncate and
file write all hold the i_mutex, just needed to add it to page_mkwrite and
various ioctl/balance things.  With this patch my space leak scripts no longer
scream bloody murder.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
2011-12-15 11:04:22 -05:00
Li Zefan 306424cc88 Btrfs: fix ctime update of on-disk inode
To reproduce the bug:

    # touch /mnt/tmp
    # stat /mnt/tmp | grep Change
    Change: 2011-12-09 09:32:23.412105981 +0800
    # chattr +i /mnt/tmp
    # stat /mnt/tmp | grep Change
    Change: 2011-12-09 09:32:43.198105295 +0800
    # umount /mnt
    # mount /dev/loop1 /mnt
    # stat /mnt/tmp | grep Change
    Change: 2011-12-09 09:32:23.412105981 +0800

We should update ctime of in-memory inode before calling
btrfs_update_inode().

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2011-12-15 10:50:37 -05:00
Mike Fleetwood ece7d20e8b Btrfs: Don't error on resizing FS to same size
It seems overly harsh to fail a resize of a btrfs file system to the
same size when a shrink or grow would succeed.  User app GParted trips
over this error.  Allow it by bypassing the shrink or grow operation.

Signed-off-by: Mike Fleetwood <mike.fleetwood@googlemail.com>
2011-11-30 18:46:04 +01:00
Arnd Hannemann 5bb1468238 Btrfs: prefix resize related printks with btrfs:
For the user it is confusing to find something like:
[10197.627710] new size for /dev/mapper/vg0-usr_share is 3221225472
in kernel log, because it doesn't point directly to btrfs.

This patch prefixes those messages with "btrfs:" like other btrfs
related printks.

Signed-off-by: Arnd Hannemann <arnd@arndnet.de>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2011-11-20 07:42:16 -05:00
Jeff Mahoney 745c4d8e16 btrfs: Fix up 32/64-bit compatibility for new ioctls
This patch casts to unsigned long before casting to a pointer and fixes
 the following warnings:
fs/btrfs/extent_io.c:2289:20: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
fs/btrfs/ioctl.c:2933:37: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
fs/btrfs/ioctl.c:2937:21: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
fs/btrfs/ioctl.c:3020:21: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
fs/btrfs/scrub.c:275:4: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
fs/btrfs/backref.c:686:27: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2011-11-20 07:42:13 -05:00
Chris Mason 740c3d226c Btrfs: fix the new inspection ioctls for 32 bit compat
The new ioctls to follow backrefs are not clean for 32/64 bit
compat.  This reworks them for u64s everywhere.  They are brand new, so
there are no problems with changing the interface now.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
2011-11-06 03:08:49 -05:00
Chris Mason 806468f8bf Merge git://git.jan-o-sch.net/btrfs-unstable into integration
Conflicts:
	fs/btrfs/Makefile
	fs/btrfs/extent_io.c
	fs/btrfs/extent_io.h
	fs/btrfs/scrub.c

Signed-off-by: Chris Mason <chris.mason@oracle.com>
2011-11-06 03:07:10 -05:00
David Sterba 6c41761fc6 btrfs: separate superblock items out of fs_info
fs_info has now ~9kb, more than fits into one page. This will cause
mount failure when memory is too fragmented. Top space consumers are
super block structures super_copy and super_for_commit, ~2.8kb each.
Allocate them dynamically. fs_info will be ~3.5kb. (measured on x86_64)

Add a wrapper for freeing fs_info and all of it's dynamically allocated
members.

Signed-off-by: David Sterba <dsterba@suse.cz>
2011-11-06 03:04:01 -05:00
David Sterba a81d3b1ba2 Merge branch 'hotfixes-20111024/josef/for-chris' into btrfs-next-stable 2011-10-24 14:47:58 +02:00
David Sterba afd582ac8f Merge remote-tracking branch 'remotes/josef/for-chris' into btrfs-next-stable 2011-10-24 14:47:57 +02:00
Lukas Czerner f4c697e640 btrfs: return EINVAL if start > total_bytes in fitrim ioctl
We should retirn EINVAL if the start is beyond the end of the file
system in the btrfs_ioctl_fitrim(). Fix that by adding the appropriate
check for it.

Also in the btrfs_trim_fs() it is possible that len+start might overflow
if big values are passed. Fix it by decrementing the len so that start+len
is equal to the file system size in the worst case.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
2011-10-20 18:10:40 +02:00
Li Zefan 008873eafb Btrfs: honor extent thresh during defragmentation
We won't defrag an extent, if it's bigger than the threshold we
specified and there's no small extent before it, but actually
the code doesn't work this way.

There are three bugs:

- When should_defrag_range() decides we should keep on defragmenting
  an extent, last_len is not incremented. (old bug)

- The length that passes to should_defrag_range() is not the length
  we're going to defrag. (new bug)

- We always defrag 256K bytes data, and a big extent can be part of
  this range. (new bug)

For a file with 4 extents:

        | 4K | 4K | 256K | 256K |

The result of defrag with (the default) 256K extent thresh should be:

        | 264K | 256K |

but with those bugs, we'll get:

        | 520K |

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
2011-10-20 18:10:39 +02:00
Li Zefan 5ca496604b Btrfs: fix wrong max_to_defrag in btrfs_defrag_file()
It's off-by-one, and thus we may skip the last page while defragmenting.

An example case:

  # create /mnt/file with 2 4K file extents
  # btrfs fi defrag /mnt/file
  # sync
  # filefrag /mnt/file
  /mnt/file: 2 extents found

So it's not defragmented.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
2011-10-20 18:10:37 +02:00
Li Zefan 151a31b25e Btrfs: use i_size_read() in btrfs_defrag_file()
Don't use inode->i_size directly, since we're not holding i_mutex.

This also fixes another bug, that i_size can change after it's checked
against 0 and then (i_size - 1) can be negative.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
2011-10-20 18:10:35 +02:00
Li Zefan cbcc83265d Btrfs: fix defragmentation regression
There's an off-by-one bug:

  # create a file with lots of 4K file extents
  # btrfs fi defrag /mnt/file
  # sync
  # filefrag -v /mnt/file
  Filesystem type is: 9123683e
  File size of /mnt/file is 1228800 (300 blocks, blocksize 4096)
   ext logical physical expected length flags
     0       0     3372              64
     1      64     3136     3435      1
     2      65     3436     3136     64
     3     129     3201     3499      1
     4     130     3500     3201     64
     5     194     3266     3563      1
     6     195     3564     3266     64
     7     259     3331     3627      1
     8     260     3628     3331     40 eof

After this patch:

  ...
  # filefrag -v /mnt/file
  Filesystem type is: 9123683e
  File size of /mnt/file is 1228800 (300 blocks, blocksize 4096)
   ext logical physical expected length flags
     0       0     3372             300 eof
  /mnt/file: 1 extent found

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
2011-10-20 18:10:34 +02:00
Diego Calleja 60ccf82f5b btrfs: fix memory leak in btrfs_defrag_file
kmemleak found this:
unreferenced object 0xffff8801b64af968 (size 512):
  comm "btrfs-cleaner", pid 3317, jiffies 4306810886 (age 903.272s)
  hex dump (first 32 bytes):
    00 82 01 07 00 ea ff ff c0 83 01 07 00 ea ff ff  ................
    80 82 01 07 00 ea ff ff c0 87 01 07 00 ea ff ff  ................
  backtrace:
    [<ffffffff816875cc>] kmemleak_alloc+0x5c/0xc0
    [<ffffffff8114aec3>] kmem_cache_alloc_trace+0x163/0x240
    [<ffffffff8127a290>] btrfs_defrag_file+0xf0/0xb20
    [<ffffffff8125d9a5>] btrfs_run_defrag_inodes+0x165/0x210
    [<ffffffff812479d7>] cleaner_kthread+0x177/0x190
    [<ffffffff81075c7d>] kthread+0x8d/0xa0
    [<ffffffff816af5f4>] kernel_thread_helper+0x4/0x10
    [<ffffffffffffffff>] 0xffffffffffffffff

"pages" is not always freed. Fix it removing the unnecesary additional return.

Signed-off-by: Diego Calleja <diegocg@gmail.com>
2011-10-20 18:10:33 +02:00
Josef Bacik e27425d614 Btrfs: only inherit btrfs specific flags when creating files
Xfstests 79 was failing because we were inheriting the S_APPEND flag when we
weren't supposed to.  There isn't any specific documentation on this so I'm
taking the test as the standard of how things work, and having S_APPEND set on a
directory doesn't mean that S_APPEND gets inherited by its children according to
this test.  So only inherit btrfs specific things.  This will let us set
compress/nocompress on specific directories and everything in the directories
will inherit this flag, same with nodatacow.  With this patch test 79 passes.
Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
2011-10-19 15:12:50 -04:00
Josef Bacik 3b16a4e3c3 Btrfs: use the inode's mapping mask for allocating pages
Johannes pointed out we were allocating only kernel pages for doing writes,
which is kind of a big deal if you are on 32bit and have more than a gig of ram.
So fix our allocations to use the mapping's gfp but still clear __GFP_FS so we
don't re-enter.  Thanks,

Reported-by: Johannes Weiner <jweiner@redhat.com>
Signed-off-by: Josef Bacik <josef@redhat.com>
2011-10-19 15:12:45 -04:00
Linus Torvalds b2f9452bd5 Merge branch 'btrfs-3.0' of git://github.com/chrismason/linux
* 'btrfs-3.0' of git://github.com/chrismason/linux:
  Btrfs: make sure not to defrag extents past i_size
  Btrfs: fix recursive auto-defrag
2011-10-13 18:20:40 +12:00
Chris Mason f7f43cc841 Btrfs: make sure not to defrag extents past i_size
The btrfs file defrag code will loop through the extents and
force COW on them.  But there is a concurrent truncate in the middle of
the defrag, it might end up defragging the same range over and over
again.

The problem is that writepage won't go through and do anything on pages
past i_size, so the cow won't happen, so the file will appear to still
be fragmented.  defrag will end up hitting the same extents again and
again.

In the worst case, the truncate can actually live lock with the defrag
because the defrag keeps creating new ordered extents which the truncate
code keeps waiting on.

The fix here is to make defrag check for i_size inside the main loop,
instead of just once before the looping starts.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
2011-10-11 11:45:55 -04:00
Li Zefan 2a0f7f5769 Btrfs: fix recursive auto-defrag
Follow those steps:

  # mount -o autodefrag /dev/sda7 /mnt
  # dd if=/dev/urandom of=/mnt/tmp bs=200K count=1
  # sync
  # dd if=/dev/urandom of=/mnt/tmp bs=8K count=1 conv=notrunc

and then it'll go into a loop: writeback -> defrag -> writeback ...

It's because writeback writes [8K, 200K] and then writes [0, 8K].

I tried to make writeback know if the pages are dirtied by defrag,
but the patch was a bit intrusive. Here I simply set writeback_index
when we defrag a file.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2011-10-10 15:43:34 -04:00
Jan Schmidt d7728c960d btrfs: new ioctls to do logical->inode and inode->path resolving
these ioctls make use of the new functions initially added for scrub. they
return all inodes belonging to a logical address (BTRFS_IOC_LOGICAL_INO) and
all paths belonging to an inode (BTRFS_IOC_INO_PATHS).

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
2011-09-29 12:54:28 +02:00
Chris Mason 0a7a0519d1 Merge branch 'btrfs-3.0' into for-linus 2011-09-20 14:49:29 -04:00
Sage Weil b6f3409b21 Btrfs: reserve sufficient space for ioctl clone
Fix a crash/BUG_ON in the clone ioctl due to insufficient reservation. We
need to reserve space for:

 - adjusting the old extent (possibly splitting it)
 - adding the new extent
 - updating the inode

Signed-off-by: Sage Weil <sage@newdream.net>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2011-09-20 14:48:51 -04:00