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2012-01-16Btrfs: profiles filterIlya Dryomov
Select chunks based on a given profile mask. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2012-01-16Btrfs: add basic infrastructure for selective balancingIlya Dryomov
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>
2012-01-16Btrfs: add basic restriper infrastructureIlya Dryomov
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>
2012-01-16Btrfs: make avail_*_alloc_bits fields dynamicIlya Dryomov
Currently when new chunks are created respective avail_alloc_bits field is updated to reflect profiles of all chunks present in the system. However when chunks are removed profile bits are never cleared. This patch clears profile bit of respective avail_alloc_bits field when the last chunk with that profile is removed. Restriper needs this to properly operate when "downgrading". Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2012-01-16Btrfs: add BTRFS_AVAIL_ALLOC_BIT_SINGLE bitIlya Dryomov
Right now on-disk BTRFS_BLOCK_GROUP_* profile bits are used for avail_{data,metadata,system}_alloc_bits fields, which gather info about available allocation profiles in the FS. When chunk is created or read from disk, its profile is OR'ed with the corresponding avail_alloc_bits field. Since SINGLE is denoted by 0 in the on-disk format, currently there is no way to tell when such chunks become avaialble. Restriper needs that information, so add a separate bit for SINGLE profile. This bit is going to be in-memory only, it should never be written out to disk, so it's not a disk format change. However to avoid remappings in future, reserve corresponding on-disk bit. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2012-01-16Btrfs: introduce masks for chunk type and profileIlya Dryomov
Chunk's type and profile are encoded in u64 flags field. Introduce masks to easily access them. Also fix the type of BTRFS_BLOCK_GROUP_* constants, it should be ULL. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2012-01-16Btrfs: get rid of *_alloc_profile fieldsIlya Dryomov
{data,metadata,system}_alloc_profile fields have been unused for a long time now. Get rid of them. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2012-01-12mm: compaction: introduce sync-light migration for use by compactionMel Gorman
This patch adds a lightweight sync migrate operation MIGRATE_SYNC_LIGHT mode that avoids writing back pages to backing storage. Async compaction maps to MIGRATE_ASYNC while sync compaction maps to MIGRATE_SYNC_LIGHT. For other migrate_pages users such as memory hotplug, MIGRATE_SYNC is used. This avoids sync compaction stalling for an excessive length of time, particularly when copying files to a USB stick where there might be a large number of dirty pages backed by a filesystem that does not support ->writepages. [aarcange@redhat.com: This patch is heavily based on Andrea's work] [akpm@linux-foundation.org: fix fs/nfs/write.c build] [akpm@linux-foundation.org: fix fs/btrfs/disk-io.c build] Signed-off-by: Mel Gorman <mgorman@suse.de> Reviewed-by: Rik van Riel <riel@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: Dave Jones <davej@redhat.com> Cc: Jan Kara <jack@suse.cz> Cc: Andy Isaacson <adi@hexapodia.org> Cc: Nai Xia <nai.xia@gmail.com> Cc: Johannes Weiner <jweiner@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-01-12mm: compaction: determine if dirty pages can be migrated without blocking ↵Mel Gorman
within ->migratepage Asynchronous compaction is used when allocating transparent hugepages to avoid blocking for long periods of time. Due to reports of stalling, there was a debate on disabling synchronous compaction but this severely impacted allocation success rates. Part of the reason was that many dirty pages are skipped in asynchronous compaction by the following check; if (PageDirty(page) && !sync && mapping->a_ops->migratepage != migrate_page) rc = -EBUSY; This skips over all mapping aops using buffer_migrate_page() even though it is possible to migrate some of these pages without blocking. This patch updates the ->migratepage callback with a "sync" parameter. It is the responsibility of the callback to fail gracefully if migration would block. Signed-off-by: Mel Gorman <mgorman@suse.de> Reviewed-by: Rik van Riel <riel@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: Dave Jones <davej@redhat.com> Cc: Jan Kara <jack@suse.cz> Cc: Andy Isaacson <adi@hexapodia.org> Cc: Nai Xia <nai.xia@gmail.com> Cc: Johannes Weiner <jweiner@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-01-11Btrfs: fix possible deadlock when opening a seed deviceLi Zefan
The correct lock order is uuid_mutex -> volume_mutex -> chunk_mutex, but when we mount a filesystem which has backing seed devices, we have this lock chain: open_ctree() lock(chunk_mutex); read_chunk_tree(); read_one_dev(); open_seed_devices(); lock(uuid_mutex); and then we hit a lockdep splat. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
2012-01-11Btrfs: update global block_rsv when creating a new block groupLi Zefan
A bug was triggered while using seed device: # mkfs.btrfs /dev/loop1 # btrfstune -S 1 /dev/loop1 # mount -o /dev/loop1 /mnt # btrfs dev add /dev/loop2 /mnt btrfs: block rsv returned -28 ------------[ cut here ]------------ WARNING: at fs/btrfs/extent-tree.c:5969 btrfs_alloc_free_block+0x166/0x396 [btrfs]() ... Call Trace: ... [<f7b7c31c>] btrfs_cow_block+0x101/0x147 [btrfs] [<f7b7eaa6>] btrfs_search_slot+0x1b8/0x55f [btrfs] [<f7b7f844>] btrfs_insert_empty_items+0x42/0x7f [btrfs] [<f7b7f8c1>] btrfs_insert_item+0x40/0x7e [btrfs] [<f7b8ac02>] btrfs_make_block_group+0x243/0x2aa [btrfs] [<f7bb3f53>] __btrfs_alloc_chunk+0x672/0x70e [btrfs] [<f7bb41ff>] init_first_rw_device+0x77/0x13c [btrfs] [<f7bb5a62>] btrfs_init_new_device+0x664/0x9fd [btrfs] [<f7bbb65a>] btrfs_ioctl+0x694/0xdbe [btrfs] [<c04f55f7>] do_vfs_ioctl+0x496/0x4cc [<c04f5660>] sys_ioctl+0x33/0x4f [<c07b9edf>] sysenter_do_call+0x12/0x38 ---[ end trace 906adac595facc7d ]--- Since seed device is readonly, there's no usable space in the filesystem. Afterwards we add a sprout device to it, and the kernel creates a METADATA block group and a SYSTEM block group where comes free space we can reserve, but we still get revervation failure because the global block_rsv hasn't been updated accordingly. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
2012-01-11Btrfs: rewrite btrfs_trim_block_group()Li Zefan
There are various bugs in block group trimming: - It may trim from offset smaller than user-specified offset. - It may trim beyond user-specified range. - It may leak free space for extents smaller than specified minlen. - It may truncate the last trimmed extent thus leak free space. - With mixed extents+bitmaps, some extents may not be trimmed. - With mixed extents+bitmaps, some bitmaps may not be trimmed (even none will be trimmed). Even for those trimmed, not all the free space in the bitmaps will be trimmed. I rewrite btrfs_trim_block_group() and break it into two functions. One is to trim extents only, and the other is to trim bitmaps only. Before patching: # fstrim -v /mnt/ /mnt/: 1496465408 bytes were trimmed After patching: # fstrim -v /mnt/ /mnt/: 2193768448 bytes were trimmed And this matches the total free space: # btrfs fi df /mnt Data: total=3.58GB, used=1.79GB System, DUP: total=8.00MB, used=4.00KB System: total=4.00MB, used=0.00 Metadata, DUP: total=205.12MB, used=97.14MB Metadata: total=8.00MB, used=0.00 Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
2012-01-11Btrfs: simplfy calculation of stripe length for discard operationLi Zefan
For btrfs raid, while discarding a range of space, we'll need to know the start offset and length to discard for each device, and it's done in btrfs_map_block(). However the calculation is a bit complex for raid0 and raid10, so I reimplement it based on a fact that: dev1 dev2 dev3 (raid0) ----------------------------------- s0 s3 s6 s1 s4 s7 s2 s5 Each device has (total_stripes / nr_dev) stripes, or plus one. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
2012-01-11Btrfs: don't pre-allocate btrfs bioLi Zefan
We pre-allocate a btrfs bio with fixed size, and then may re-allocate memory if we find stripes are bigger than the fixed size. But this pre-allocation is not necessary. Also we don't have to calcuate the stripe number twice. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
2012-01-11Btrfs: don't pass a trans handle unnecessarily in volumes.cLi Zefan
Some functions never use the transaction handle passed to them. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
2012-01-11Btrfs: reserve metadata space in btrfs_ioctl_setflags()Li Zefan
Check and reserve space for btrfs_update_inode(). Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
2012-01-11Btrfs: remove BUG_ON()s in btrfs_ioctl_setflags()Li Zefan
We can recover from errors and return -errno to user space. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
2012-01-11Btrfs: check the return value of io_ctl_init()Li Zefan
It can return -ENOMEM. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
2012-01-11Btrfs: avoid possible NULL deref in io_ctl_drop_pages()Li Zefan
If we run into some failure path in io_ctl_prepare_pages(), io_ctl->pages[] array may have some NULL pointers. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
2012-01-11Btrfs: add pinned extents to on-disk free space cache correctlyLi Zefan
I got this while running xfstests: [24256.836098] block group 317849600 has an wrong amount of free space [24256.836100] btrfs: failed to load free space cache for block group 317849600 We should clamp the extent returned by find_first_extent_bit(), so the start of the extent won't smaller than the start of the block group. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
2012-01-11Merge branch 'for-linus' of ↵Li Zefan
git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs into for-linus
2012-01-10Merge branch 'writeback-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux * 'writeback-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux: writeback: move MIN_WRITEBACK_PAGES to fs-writeback.c writeback: balanced_rate cannot exceed write bandwidth writeback: do strict bdi dirty_exceeded writeback: avoid tiny dirty poll intervals writeback: max, min and target dirty pause time writeback: dirty ratelimit - think time compensation btrfs: fix dirtied pages accounting on sub-page writes writeback: fix dirtied pages accounting on redirty writeback: fix dirtied pages accounting on sub-page writes writeback: charge leaked page dirties to active tasks writeback: Include all dirty inodes in background writeback
2012-01-10btrfs: pass __GFP_WRITE for buffered write page allocationsJohannes Weiner
Tell the page allocator that pages allocated for a buffered write are expected to become dirty soon. Signed-off-by: Johannes Weiner <jweiner@redhat.com> Reviewed-by: Rik van Riel <riel@redhat.com> Acked-by: Mel Gorman <mgorman@suse.de> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: Dave Chinner <david@fromorbit.com> Cc: Jan Kara <jack@suse.cz> Cc: Shaohua Li <shaohua.li@intel.com> Cc: Chris Mason <chris.mason@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-01-08btrfs: take allocation of ->tree_root into open_ctree()Al Viro
now that we don't need it for sget() anymore... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-08btrfs: let ->s_fs_info point to fs_info, not root...Al Viro
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>
2012-01-08btrfs: consolidate failure exits in btrfs_mount() a bitAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-08btrfs: make free_fs_info() call ->kill_sb() unconditionalAl Viro
... and don't bother with it after btrfs_fill_super() failure - ->kill_sb() (unlike ->put_super()) will be called even if we have not got non-NULL ->s_root. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-08btrfs: merge free_fs_info() calls on fill_super failuresAl Viro
... all the way up into btrfs_mount(). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-08btrfs: kill pointless reassignment of ->s_fs_info in btrfs_fill_super()Al Viro
We do not (fortunately) modify ->s_fs_info of superblock on the fly in btrfs_fill_super(); apparent assignment is a no-op. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-08btrfs: make open_ctree() return intAl Viro
It returns either ERR_PTR(-ve) or sb->s_fs_info. The latter can be found by caller just as well, TYVM, no need to return it. Just return -ve or 0... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-08btrfs: sanitizing ->fs_info, part 5Al Viro
close_ctree() uses a weird mix of accesses to root->fs_info and its value at the beginning of function stored in local variable. Since ->fs_info *never* changes, let's just use the local variable to avoid confusion. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-08btrfs: sanitizing ->fs_info, part 4Al Viro
A new helper: btrfs_alloc_root(fs_info); allocates btrfs_root and sets ->fs_info. All places allocating the suckers converted to it. At that point we *never* reassign ->fs_info of btrfs_root; it's set before anyone sees the address of newly allocated struct btrfs_root and never assigned anywhere else. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-08btrfs: sanitizing ->fs_info, part 3Al Viro
move assignments to ->fs_info in open_ctree() up, to the place just after the original allocations. Assignment for tree_root becomes a no-op - we'd obtained fs_info from tree_root->fs_info in the first place. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-08btrfs: sanitizing ->fs_info, part 2Al Viro
lift assignment to callers of find_and_setup_root() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-08btrfs: sanitizing ->fs_info, part 1Al Viro
take assignment of ->fs_info to callers of __setup_root() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-08btrfs: fix a deadlock in btrfs_scan_one_device()Al Viro
pathname resolution under a global mutex, taken on some paths in ->mount() is a Bad Idea(tm) - think what happens if said pathname resolution triggers automount of some btrfs instance and walks into attempt to grab the same mutex. Deadlock - we are waiting for daemon to finish walking the path, daemon is waiting for us to release the mutex... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-08btrfs: fix mount/umount raceAl Viro
Do *NOT* skip doomed superblocks in btrfs_test_super(); we want sget() to wait for their shutdown to complete. Since we don't mutilate ->s_fs_info in ->put_super() anymore (or free what it used to point to until the superblock is past being findable by sget()), we can just DTRT there and report a match. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-08btrfs: get ->kill_sb() of its ownAl Viro
... and move free_fs_info() to that, out of ->put_super(). Do NOT set ->s_fs_info to NULL in the latter; we need it for sget() to be able to see and wait for fs in the middle of umount if we get a mount/umount race. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-08btrfs: preparation to fixing mount/umount raceAl Viro
We need fs_info and root to live until the moment when the victim superblock leaves the list, so we need to postpone free_fs_info() until after ->put_super(). The call is buried in close_ctree(), though, so we need to lift it into the callers (including btrfs_put_super()) first. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-08Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (53 commits) Kconfig: acpi: Fix typo in comment. misc latin1 to utf8 conversions devres: Fix a typo in devm_kfree comment btrfs: free-space-cache.c: remove extra semicolon. fat: Spelling s/obsolate/obsolete/g SCSI, pmcraid: Fix spelling error in a pmcraid_err() call tools/power turbostat: update fields in manpage mac80211: drop spelling fix types.h: fix comment spelling for 'architectures' typo fixes: aera -> area, exntension -> extension devices.txt: Fix typo of 'VMware'. sis900: Fix enum typo 'sis900_rx_bufer_status' decompress_bunzip2: remove invalid vi modeline treewide: Fix comment and string typo 'bufer' hyper-v: Update MAINTAINERS treewide: Fix typos in various parts of the kernel, and fix some comments. clockevents: drop unknown Kconfig symbol GENERIC_CLOCKEVENTS_MIGR gpio: Kconfig: drop unknown symbol 'CS5535_GPIO' leds: Kconfig: Fix typo 'D2NET_V2' sound: Kconfig: drop unknown symbol ARCH_CLPS7500 ... Fix up trivial conflicts in arch/powerpc/platforms/40x/Kconfig (some new kconfig additions, close to removed commented-out old ones)
2012-01-08Merge branch 'pm-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm * 'pm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (76 commits) PM / Hibernate: Implement compat_ioctl for /dev/snapshot PM / Freezer: fix return value of freezable_schedule_timeout_killable() PM / shmobile: Allow the A4R domain to be turned off at run time PM / input / touchscreen: Make st1232 use device PM QoS constraints PM / QoS: Introduce dev_pm_qos_add_ancestor_request() PM / shmobile: Remove the stay_on flag from SH7372's PM domains PM / shmobile: Don't include SH7372's INTCS in syscore suspend/resume PM / shmobile: Add support for the sh7372 A4S power domain / sleep mode PM: Drop generic_subsys_pm_ops PM / Sleep: Remove forward-only callbacks from AMBA bus type PM / Sleep: Remove forward-only callbacks from platform bus type PM: Run the driver callback directly if the subsystem one is not there PM / Sleep: Make pm_op() and pm_noirq_op() return callback pointers PM/Devfreq: Add Exynos4-bus device DVFS driver for Exynos4210/4212/4412. PM / Sleep: Merge internal functions in generic_ops.c PM / Sleep: Simplify generic system suspend callbacks PM / Hibernate: Remove deprecated hibernation snapshot ioctls PM / Sleep: Fix freezer failures due to racy usermodehelper_is_disabled() ARM: S3C64XX: Implement basic power domain support PM / shmobile: Use common always on power domain governor ... Fix up trivial conflict in fs/xfs/xfs_buf.c due to removal of unused XBT_FORCE_SLEEP bit
2012-01-07Btrfs: revamp clustered allocation logicAlexandre Oliva
Parameterize clusters on minimum total size, minimum chunk size and minimum contiguous size for at least one chunk, without limits on cluster, window or gap sizes. Don't tolerate any fragmentation for SSD_SPREAD; accept it for metadata, but try to keep data dense. Signed-off-by: Alexandre Oliva <oliva@lsd.ic.unicamp.br> Signed-off-by: Chris Mason <chris.mason@oracle.com>
2012-01-07Btrfs: don't set up allocation result twiceAlexandre Oliva
We store the allocation start and length twice in ins, once right after the other, but with intervening calls that may prevent the duplicate from being optimized out by the compiler. Remove one of the assignments. Signed-off-by: Alexandre Oliva <oliva@lsd.ic.unicamp.br> Signed-off-by: Chris Mason <chris.mason@oracle.com>
2012-01-06vfs: switch ->show_options() to struct dentry *Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-06Btrfs: test free space only for unclustered allocationAlexandre Oliva
Since the clustered allocation may be taking extents from a different block group, there's no point in spin-locking and testing the current block group free space before attempting to allocate space from a cluster, even more so when we might refrain from even trying the cluster in the current block group because, after the cluster was set up, not enough free space remained. Furthermore, cluster creation attempts fail fast when the block group doesn't have enough free space, so the test was completely superfluous. I've move the free space test past the cluster allocation attempt, where it is more useful, and arranged for a cluster in the current block group to be released before trying an unclustered allocation, when we reach the LOOP_NO_EMPTY_SIZE stage, so that the free space in the cluster stands a chance of being combined with additional free space in the block group so as to succeed in the allocation attempt. Signed-off-by: Alexandre Oliva <oliva@lsd.ic.unicamp.br> Signed-off-by: Chris Mason <chris.mason@oracle.com>
2012-01-06Btrfs: use bigger metadata chunks on bigger filesystemsChris Mason
The 256MB chunk is a little small on a huge FS. This scales up the chunk size. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2012-01-06Btrfs: lower the bar for chunk allocationChris Mason
The chunk allocation code has tried to keep a pretty tight lid on creating new metadata chunks. This is partially because in the past the reservation code didn't give us an accurate idea of how much space was being used. The new code is much more accurate, so we're able to get rid of some of these checks. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2012-01-06Btrfs: run chunk allocations while we do delayed refsChris Mason
Btrfs tries to batch extent allocation tree changes to improve performance and reduce metadata trashing. But it doesn't allocate new metadata chunks while it is doing allocations for the extent allocation tree. This commit changes the delayed refence code to do chunk allocations if we're getting low on room. It prevents crashes and improves performance. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2012-01-05Btrfs: make sure we're not using obsolete code in btrfs_get_extentJan Schmidt
There's code in btrfs_get_extent that should never be used. This patch turns a WARN_ON(1) into a BUG(), hoping we can remove the transaction code from btrfs_get_extent soon. Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
2012-01-05Btrfs: new backref walking codeJan Schmidt
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>
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