Qu Wenruo [Thu, 29 Mar 2018 01:08:11 +0000 (09:08 +0800)]
btrfs: Validate child tree block's level and first key
We have several reports about node pointer points to incorrect child
tree blocks, which could have even wrong owner and level but still with
valid generation and checksum.
Although btrfs check could handle it and print error message like:
leaf parent key incorrect 60670574592
Kernel doesn't have enough check on this type of corruption correctly.
At least add such check to read_tree_block() and btrfs_read_buffer(),
where we need two new parameters @level and @first_key to verify the
child tree block.
The new @level check is mandatory and all call sites are already
modified to extract expected level from its call chain.
While @first_key is optional, the following call sites are skipping such
check:
1) Root node/leaf
As ROOT_ITEM doesn't contain the first key, skip @first_key check.
2) Direct backref
Only parent bytenr and level is known and we need to resolve the key
all by ourselves, skip @first_key check.
Another note of this verification is, it needs extra info from nodeptr
or ROOT_ITEM, so it can't fit into current tree-checker framework, which
is limited to node/leaf boundary.
Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Filipe Manana [Mon, 26 Mar 2018 22:59:12 +0000 (23:59 +0100)]
Btrfs: fix copy_items() return value when logging an inode
When logging an inode, at tree-log.c:copy_items(), if we call
btrfs_next_leaf() at the loop which checks for the need to log holes, we
need to make sure copy_items() returns the value 1 to its caller and
not 0 (on success). This is because the path the caller passed was
released and is now different from what is was before, and the caller
expects a return value of 0 to mean both success and that the path
has not changed, while a return value of 1 means both success and
signals the caller that it can not reuse the path, it has to perform
another tree search.
Even though this is a case that should not be triggered on normal
circumstances or very rare at least, its consequences can be very
unpredictable (especially when replaying a log tree).
Fixes: 16e7549f045d ("Btrfs: incompatible format change to remove hole extents") Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Filipe Manana [Mon, 26 Mar 2018 22:59:00 +0000 (23:59 +0100)]
Btrfs: fix fsync after hole punching when using no-holes feature
When we have the no-holes mode enabled and fsync a file after punching a
hole in it, we can end up not logging the whole hole range in the log tree.
This happens if the file has extent items that span more than one leaf and
we punch a hole that covers a range that starts in a leaf but does not go
beyond the offset of the first extent in the next leaf.
# We now have 2 leafs in our filesystem fs tree, the first leaf has an
# item corresponding the extent at file offset 216530944 and the second
# leaf has a first item corresponding to the extent at offset 217055232.
# Now we punch a hole that partially covers the range of the extent at
# offset 216530944 but does go beyond the offset 217055232.
# Before this patch, only the subrange [216658016, 216662016[ (length of
# 4000 bytes) was logged, leaving an incorrect file layout after log
# replay.
Fix this by checking if there is a hole between the last extent item that
we processed and the first extent item in the next leaf, and if there is
one, log an explicit hole extent item.
Fixes: 16e7549f045d ("Btrfs: incompatible format change to remove hole extents") Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Qu Wenruo [Tue, 12 Dec 2017 07:34:34 +0000 (15:34 +0800)]
btrfs: qgroup: Use root::qgroup_meta_rsv_* to record qgroup meta reserved space
For quota disabled->enable case, it's possible that at reservation time
quota was not enabled so no bytes were really reserved, while at release
time, quota was enabled so we will try to release some bytes we didn't
really own.
Such situation can cause metadata reserveation underflow, for both types,
also less possible for per-trans type since quota enable will commit
transaction.
To address this, record qgroup meta reserved bytes into
root::qgroup_meta_rsv_pertrans and ::prealloc.
So at releasing time we won't free any bytes we didn't reserve.
For DATA, it's already handled by io_tree, so nothing needs to be done
there.
Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Qu Wenruo [Tue, 12 Dec 2017 07:34:33 +0000 (15:34 +0800)]
btrfs: delayed-inode: Use new qgroup meta rsv for delayed inode and item
Quite similar for delalloc, some modification to delayed-inode and
delayed-item reservation. Also needs extra parameter for release case
to distinguish normal release and error release.
Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Qu Wenruo [Tue, 12 Dec 2017 07:34:32 +0000 (15:34 +0800)]
btrfs: qgroup: Use separate meta reservation type for delalloc
Before this patch, btrfs qgroup is mixing per-transcation meta rsv with
preallocated meta rsv, making it quite easy to underflow qgroup meta
reservation.
Since we have the new qgroup meta rsv types, apply it to delalloc
reservation.
Now for delalloc, most of its reserved space will use META_PREALLOC qgroup
rsv type.
And for callers reducing outstanding extent like btrfs_finish_ordered_io(),
they will convert corresponding META_PREALLOC reservation to
META_PERTRANS.
This is mainly due to the fact that current qgroup numbers will only be
updated in btrfs_commit_transaction(), that's to say if we don't keep
such placeholder reservation, we can exceed qgroup limitation.
And for callers freeing outstanding extent in error handler, we will
just free META_PREALLOC bytes.
This behavior makes callers of btrfs_qgroup_release_meta() or
btrfs_qgroup_convert_meta() to be aware of which type they are.
So in this patch, btrfs_delalloc_release_metadata() and its callers get
an extra parameter to info qgroup to do correct meta convert/release.
The good news is, even we use the wrong type (convert or free), it won't
cause obvious bug, as prealloc type is always in good shape, and the
type only affects how per-trans meta is increased or not.
So the worst case will be at most metadata limitation can be sometimes
exceeded (no convert at all) or metadata limitation is reached too soon
(no free at all).
Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Qu Wenruo [Tue, 12 Dec 2017 07:34:31 +0000 (15:34 +0800)]
btrfs: qgroup: Introduce function to convert META_PREALLOC into META_PERTRANS
For meta_prealloc reservation users, after btrfs_join_transaction()
caller will modify tree so part (or even all) meta_prealloc reservation
should be converted to meta_pertrans until transaction commit time.
This patch introduces a new function,
btrfs_qgroup_convert_reserved_meta() to do this for META_PREALLOC
reservation user.
Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Qu Wenruo [Tue, 12 Dec 2017 07:34:30 +0000 (15:34 +0800)]
btrfs: qgroup: Don't use root->qgroup_meta_rsv for qgroup
Since qgroup has seperate metadata reservation types now, we can
completely get rid of the old root->qgroup_meta_rsv, which mostly acts
as current META_PERTRANS reservation type.
Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Qu Wenruo [Tue, 12 Dec 2017 07:34:29 +0000 (15:34 +0800)]
btrfs: qgroup: Split meta rsv type into meta_prealloc and meta_pertrans
Btrfs uses 2 different methods to reseve metadata qgroup space.
1) Reserve at btrfs_start_transaction() time
This is quite straightforward, caller will use the trans handler
allocated to modify b-trees.
In this case, reserved metadata should be kept until qgroup numbers
are updated.
2) Reserve by using block_rsv first, and later btrfs_join_transaction()
This is more complicated, caller will reserve space using block_rsv
first, and then later call btrfs_join_transaction() to get a trans
handle.
In this case, before we modify trees, the reserved space can be
modified on demand, and after btrfs_join_transaction(), such reserved
space should also be kept until qgroup numbers are updated.
Since these two types behave differently, split the original "META"
reservation type into 2 sub-types:
META_PERTRANS:
For above case 1)
META_PREALLOC:
For reservations that happened before btrfs_join_transaction() of
case 2)
NOTE: This patch will only convert existing qgroup meta reservation
callers according to its situation, not ensuring all callers are at
correct timing.
Such fix will be added in later patches.
Qu Wenruo [Tue, 12 Dec 2017 07:34:26 +0000 (15:34 +0800)]
btrfs: qgroup: Fix wrong qgroup reservation update for relationship modification
When modifying qgroup relationship, for qgroup which only owns exclusive
extents, we will go through quick update path.
In this path, we will add/subtract exclusive and reference number for
parent qgroup, since the source (child) qgroup only has exclusive
extents, destination (parent) qgroup will also own or lose those extents
exclusively.
The same should be the same for reservation, since later reservation
adding/releasing will also affect parent qgroup, without the reservation
carried from child, parent will underflow reservation or have dead
reservation which will never be freed.
However original code doesn't do the same thing for reservation.
It handles qgroup reservation quite differently:
It removes qgroup reservation, as it's allocating space from the
reserved qgroup for relationship adding.
But does nothing for qgroup reservation if we're removing a qgroup
relationship.
According to the original code, it looks just like because we're adding
qgroup->rfer, the code assumes we're writing new data, so it's follows
the normal write routine, by reducing qgroup->reserved and adding
qgroup->rfer/excl.
This old behavior is wrong, and should be fixed to follow the same
excl/rfer behavior.
Just fix it by using the correct behavior described above.
Fixes: 31193213f1f9 ("Btrfs: qgroup: Introduce a may_use to account space_info->bytes_may_use.") Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Qu Wenruo [Tue, 12 Dec 2017 07:34:24 +0000 (15:34 +0800)]
btrfs: qgroup: Introduce helpers to update and access new qgroup rsv
Introduce helpers to:
1) Get total reserved space
For limit calculation
2) Add/release reserved space for given type
With underflow detection and warning
3) Add/release reserved space according to child qgroup
Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Omar Sandoval [Thu, 25 Jan 2018 23:56:17 +0000 (15:56 -0800)]
Btrfs: delete dead code in btrfs_orphan_add()
btrfs_orphan_add() has had this case commented out since it was first
introduced in commit d68fc57b7e32 ("Btrfs: Metadata reservation for
orphan inodes"). Most of the orphan cleanup code has been rewritten
since then, so it's safe to say that this code isn't needed.
Signed-off-by: Omar Sandoval <osandov@fb.com> Reviewed-by: Nikolay Borisov <nborisov@suse.com>
[ switch to bool ] Signed-off-by: David Sterba <dsterba@suse.com>
Jeff Mahoney [Tue, 20 Mar 2018 19:25:26 +0000 (15:25 -0400)]
btrfs: defer adding raid type kobject until after chunk relocation
Any time the first block group of a new type is created, we add a new
kobject to sysfs to hold the attributes for that type. Kobject-internal
allocations always use GFP_KERNEL, making them prone to fs-reclaim races.
While it appears as if this can occur any time a block group is created,
the only times the first block group of a new type can be created in
memory is at mount and when we create the first new block group during
raid conversion.
This patch adds a new list to track pending kobject additions and then
handles them after we do chunk relocation. Between relocating the
target chunk (or forcing allocation of a new chunk in the case of data)
and removing the old chunk, we're in a safe place for fs-reclaim to
occur. We're holding the volume mutex, which is already held across
page faults, and the delete_unused_bgs_mutex, which will only stall
the cleaner thread.
Signed-off-by: Jeff Mahoney <jeffm@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Jeff Mahoney [Tue, 20 Mar 2018 19:25:25 +0000 (15:25 -0400)]
btrfs: remove dead create_space_info calls
Since commit 2be12ef79 (btrfs: Separate space_info create/update), we've
separated out the creation and updating of the space info structures.
That commit was a straightforward refactoring of the two parts of
update_space_info, but we can go a step further. Since commits c59021f84 (Btrfs: fix OOPS of empty filesystem after balance) and b742bb82f (Btrfs: Link block groups of different raid types), we know
that the space_info structures will be created at mount and there will
only ever be, at most, three of them.
This patch cleans out the create_space_info calls after __find_space_info
returns NULL since __find_space_info *can't* return NULL.
The initial cause for reviewing this was the kobject_add calls from
create_space_info occuring in sites where fs-reclaim wasn't allowed. Now
we are certain they occur only early in the mount process and are safe.
Signed-off-by: Jeff Mahoney <jeffm@suse.com> Reviewed-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Liu Bo [Thu, 22 Mar 2018 01:20:11 +0000 (09:20 +0800)]
Btrfs: replace: cache rbio when rebuild data on missing device
Rebuild on missing device is as same as recover, after it's done, rbio
has data which is consistent with on-disk data, so it can be cached to
avoid further reads.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: Liu Bo <bo.liu@linux.alibaba.com> Signed-off-by: David Sterba <dsterba@suse.com>
Jeff Mahoney [Fri, 16 Mar 2018 18:36:27 +0000 (14:36 -0400)]
btrfs: fix lockdep splat in btrfs_alloc_subvolume_writers
While running btrfs/011, I hit the following lockdep splat.
This is the important bit:
pcpu_alloc+0x1ac/0x5e0
__percpu_counter_init+0x4e/0xb0
btrfs_init_fs_root+0x99/0x1c0 [btrfs]
btrfs_get_fs_root.part.54+0x5b/0x150 [btrfs]
resolve_indirect_refs+0x130/0x830 [btrfs]
find_parent_nodes+0x69e/0xff0 [btrfs]
btrfs_find_all_roots_safe+0xa0/0x110 [btrfs]
btrfs_find_all_roots+0x50/0x70 [btrfs]
btrfs_qgroup_prepare_account_extents+0x53/0x90 [btrfs]
btrfs_commit_transaction+0x3ce/0x9b0 [btrfs]
The percpu_counter_init call in btrfs_alloc_subvolume_writers
uses GFP_KERNEL, which we can't do during transaction commit.
This switches it to GFP_NOFS.
========================================================
WARNING: possible irq lock inversion dependency detected
4.12.14-kvmsmall #8 Tainted: G W
--------------------------------------------------------
kswapd0/50 just changed the state of lock:
(&delayed_node->mutex){+.+.-.}, at: [<ffffffffc06994fa>] __btrfs_release_delayed_node+0x3a/0x1f0 [btrfs]
but this lock took another, RECLAIM_FS-unsafe lock in the past:
(pcpu_alloc_mutex){+.+.+.}
and interrupts could create inverse lock ordering between them.
other info that might help us debug this:
Chain exists of:
&delayed_node->mutex --> &found->groups_sem --> pcpu_alloc_mutex
Nikolay Borisov [Thu, 15 Mar 2018 12:36:28 +0000 (14:36 +0200)]
btrfs: Remove unused extent_root var from caching_thread
Added by b4570aa994b8 ("btrfs: fix compiling with CONFIG_BTRFS_DEBUG
enabled.") and obsoleted by 2ff7e61e0d30 ("btrfs: take an fs_info
directly when the root is not used otherwise").
Signed-off-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Nikolay Borisov [Thu, 15 Mar 2018 12:36:26 +0000 (14:36 +0200)]
btrfs: remove max_active var from open_ctree
Introduced by 5cdc7ad337fb ("btrfs: Replace fs_info->workers with
btrfs_workqueue.") but obsoleted by 2a4581983f90 ("btrfs: factor
btrfs_init_workqueues() out of open_ctree()").
Signed-off-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Nikolay Borisov [Thu, 15 Mar 2018 12:36:25 +0000 (14:36 +0200)]
btrfs: Remove unused root var from relink_file_extents
Added in 38c227d87c49 ("Btrfs: snapshot-aware defrag") but subsequently
made redundant by 0b246afa62b0 ("btrfs: root->fs_info cleanup, add
fs_info convenience variables").
Signed-off-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Nikolay Borisov [Thu, 15 Mar 2018 12:36:23 +0000 (14:36 +0200)]
btrfs: Remove unused length var from scrub_handle_errored_block
Added in b5d67f64f9bc ("Btrfs: change scrub to support big blocks") but
rendered redundant by be50a8ddaae1 ("Btrfs: Simplify
scrub_setup_recheck_block()'s argument").
Signed-off-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Nikolay Borisov [Thu, 15 Mar 2018 12:36:22 +0000 (14:36 +0200)]
btrfs: Remove unused op_key var from add_delayed_refs
Added as part of 86d5f9944252 ("btrfs: convert prelimary reference
tracking to use rbtrees") but never used. tmp_op_key essentially
subsumed that variable.
Signed-off-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
This condition is meaningless, @devs_increment has nothing to do with
@sub_stripes.
In fact, in btrfs_raid_array[], profile with sub_stripes larger than 1
(RAID10) already has the @devs_increment set to 2.
So no need to multiple it by @sub_stripes.
And above condition is also dead.
For RAID10, @devs_increment * @sub_stripes equals 4, which is also the
@devs_min of RAID10.
For other profiles, @sub_stripes is always 1, and since @ndevs is
rounded down to @devs_increment, the condition will always be true.
Remove the meaningless condition to make later reader wander less.
Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Nikolay Borisov [Tue, 13 Mar 2018 10:22:32 +0000 (12:22 +0200)]
btrfs: Document parameters of btrfs_reserve_extent
This function is the entry to the extent allocator and as such has
quite a number of parameters. Some of those have subtle effects on the
allocation algorithm. Document the parameters.
Signed-off-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: Anand Jain <anand.jain@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
Nikolay Borisov [Mon, 12 Mar 2018 12:48:09 +0000 (14:48 +0200)]
btrfs: Handle error from btrfs_uuid_tree_rem call in _btrfs_ioctl_set_received_subvol
As with every function which deals with modifying the btree
btrfs_uuid_tree_rem can fail for any number of reasons (ie. EIO/ENOMEM).
Handle return error value from this function gracefully by aborting the
transaction.
Fixes: dd5f9615fc5c ("Btrfs: maintain subvolume items in the UUID tree") Signed-off-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Nikolay Borisov [Tue, 13 Mar 2018 08:26:06 +0000 (10:26 +0200)]
btrfs: Use sizeof directly instead of a constant variable
The kernel would like to have all stack VLA usage removed[1].
Unfortunately using an integer constant variable as the size of an
array is still considered a VLA. Instead let's use directly sizeof(var)
which removes the VLA usage. Use the occasion to remove csum_size
altogether and use sizeof() also for the size passed to memcmp
[1]: https://lkml.org/lkml/2018/3/7/621
Signed-off-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
David Sterba [Fri, 23 Jun 2017 01:05:23 +0000 (03:05 +0200)]
btrfs: separate types for submit_bio_start and submit_bio_done
The callbacks make use of different parameters that are passed to the
other type unnecessarily. This patch adds separate types for each and
the unused parameters will be removed.
The type extent_submit_bio_hook_t keeps all parameters and can be used
where the start/done types are not appropriate.
David Sterba [Mon, 5 Mar 2018 14:47:39 +0000 (15:47 +0100)]
btrfs: kill trivial wrapper tree_mod_log_eb_move
The wrapper is effectively an alias for tree_mod_log_insert_move but
also hides the missing error handling. To make that more visible, lift
the BUG_ON to the callers.
Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Liu Bo [Wed, 7 Mar 2018 19:08:09 +0000 (12:08 -0700)]
Btrfs: scrub: batch rebuild for raid56
In case of raid56, writes and rebuilds always take BTRFS_STRIPE_LEN(64K)
as unit, however, scrub_extent() sets blocksize as unit, so rebuild
process may be triggered on every block on a same stripe.
A typical example would be that when we're replacing a disappeared disk,
all reads on the disks get -EIO, every block (size is 4K if blocksize is
4K) would go thru these,
scrub_handle_errored_block
scrub_recheck_block # re-read pages one by one
scrub_recheck_block # rebuild by calling raid56_parity_recover()
page by page
Although with raid56 stripe cache most of reads during rebuild can be
avoided, the parity recover calculation(xor or raid6 algorithms) needs to
be done $(BTRFS_STRIPE_LEN / blocksize) times.
This makes it smarter by doing raid56 scrub/replace on stripe length.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
David Sterba [Fri, 9 Mar 2018 13:37:01 +0000 (14:37 +0100)]
btrfs: sort and group mount option definitions
Sort mount options by the primary name, followed by the 'no-'
counterpart if it exists. Group the deprecated and debugging options.
Enum and token defintions are synced.
Btrfs has two mount options for SSD optimizations: ssd and ssd_spread.
Presently there is an option to disable all SSD optimizations, but there
isn't an option to disable just ssd_spread.
This patch adds a mount option nossd_spread that disables ssd_spread
only.
Reviewed-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Howard McLauchlan <hmclauchlan@fb.com> Reviewed-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
Nikolay Borisov [Mon, 5 Feb 2018 08:41:13 +0000 (10:41 +0200)]
btrfs: Remove userspace transaction ioctls
Commit 3558d4f88ec8 ("btrfs: Deprecate userspace transaction ioctls")
marked the beginning of the end of userspace transaction. This commit
finishes the job! There are no known users and ceph does not use the
ioctl anymore.
Signed-off-by: Nikolay Borisov <nborisov@suse.com> Acked-by: Sage Weil <sage@redhat.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Qu Wenruo [Tue, 19 Dec 2017 07:44:54 +0000 (15:44 +0800)]
btrfs: qgroup: Fix root item corruption when multiple same source snapshots are created with quota enabled
When multiple pending snapshots referring to the same source subvolume
are executed, enabled quota will cause root item corruption, where root
items are using old bytenr (no backref in extent tree).
This can be triggered by fstests btrfs/152.
The cause is when source subvolume is still dirty, extra commit
(simplied transaction commit) of qgroup_account_snapshot() can skip
dirty roots not recorded in current transaction, making root item of
source subvolume not updated.
Fix it by forcing recording source subvolume in current transaction
before qgroup sub-transaction commit.
Reported-by: Justin Maggard <jmaggard@netgear.com> Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Nikolay Borisov [Wed, 14 Feb 2018 12:37:26 +0000 (14:37 +0200)]
btrfs: Relax memory barrier in btrfs_tree_unlock
When performing an unlock on an extent buffer we'd like to order the
decrement of extent_buffer::blocking_writers with waking up any
waiters. In such situations it's sufficient to use smp_mb__after_atomic
rather than the heavy smp_mb. On architectures where atomic operations
are fully ordered (such as x86 or s390) unconditionally executing
a heavyweight smp_mb instruction causes a severe hit to performance
while bringin no improvements in terms of correctness.
The better thing is to use the appropriate smp_mb__after_atomic routine
which will do the correct thing (invoke a full smp_mb or in the case
of ordered atomics insert a compiler barrier). Put another way,
an RMW atomic op + smp_load__after_atomic equals, in terms of
semantics, to a full smp_mb. This ensures that none of the problems
described in the accompanying comment of waitqueue_active occur.
No functional changes.
Signed-off-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Matthew Wilcox [Tue, 6 Mar 2018 19:23:16 +0000 (11:23 -0800)]
btrfs: Use filemap_range_has_page()
The current implementation of btrfs_page_exists_in_range() gives the
wrong answer if the workingset code has stored a shadow entry in the
page cache. The filemap_range_has_page() function does not have this
problem, and it's shared code, so use it instead.
eigned-off-by: Matthew Wilcox <mawilcox@microsoft.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Liu Bo [Fri, 2 Mar 2018 23:10:41 +0000 (16:10 -0700)]
Btrfs: dev-replace: make sure target is identical to source when raid56 rebuild fails
In the last step of scrub_handle_error_block, we try to combine good
copies on all possible mirrors, this works fine for raid1 and raid10,
but not for raid56 as it's doing parity rebuild.
If parity rebuild doesn't get back with correct data which matches its
checksum, in case of replace we'd rather write what is stored in the
source device than the data calculuated from parity.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
Su Yue [Mon, 5 Mar 2018 09:13:37 +0000 (17:13 +0800)]
btrfs: adjust return values of btrfs_inode_by_name
Previously, btrfs_inode_by_name() returned 0 which left caller to check
objectid of location even location if the type was invalid.
Let btrfs_inode_by_name() return -EUCLEAN if a corrupted location of a
dir entry is found. Removal of label out_err also simplifies the
function.
Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com> Reviewed-by: David Sterba <dsterba@suse.com>
[ drop unlikely ] Signed-off-by: David Sterba <dsterba@suse.com>
Anand Jain [Tue, 27 Feb 2018 04:41:59 +0000 (12:41 +0800)]
btrfs: rename btrfs_close_extra_device to btrfs_free_extra_devids
This function btrfs_close_extra_devices() is about freeing
extra devids which once it may have belonged to this filesystem.
So rename it and add the comment. The _devid suffix is
appropriate as this function won't handle devices which are
outside of the filesytem being mounted.
Signed-off-by: Anand Jain <anand.jain@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
Liu Bo [Sat, 3 Mar 2018 01:05:49 +0000 (18:05 -0700)]
Btrfs: send: fix typo in TLV_PUT
According to tlv_put()'s prototype, data and attrlen needs to be
exchanged in the macro, but seems all callers are already aware of
this misorder and are therefore not affected.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Nikolay Borisov [Tue, 27 Feb 2018 15:37:17 +0000 (17:37 +0200)]
btrfs: Remove root arg from btrfs_log_inode_parent
btrfs_log_inode_parent is called from 2 places (btrfs_log_dentry_safe
and btrfs_log_new_name) both of which pass inode->root as the root
argument and the inode itself. Remove the redundant root argument and
get a reference to the root directly from the inode, also remove
redundant root != inode->root check from the same function. No
functional change.
Signed-off-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Nikolay Borisov [Tue, 27 Feb 2018 15:37:16 +0000 (17:37 +0200)]
btrfs: Remove redundant comment from btrfs_search_forward
This function always sets keep_locks to 1 and saves the old value of
keep_locks which is restored at the end. So there is no way it can be
called without keep_locks being set. Remove comment imposing redundant
requirement on callers.
Signed-off-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Filipe Manana [Tue, 6 Feb 2018 20:40:40 +0000 (20:40 +0000)]
Btrfs: send, do not issue unnecessary truncate operations
When send finishes processing an inode representing a regular file, it
always issues a truncate operation for that file, even if its size did
not change or the last write sets the file size correctly. In the most
common cases, the issued write operations set the file to correct size
(either full or incremental sends) or the file size did not change (for
incremental sends), so the only case where a truncate operation is needed
is when a file size becomes smaller in the send snapshot when compared
to the parent snapshot.
By not issuing unnecessary truncate operations we reduce the stream size
and save time in the receiver. Currently truncating a file to the same
size triggers writeback of its last page (if it's dirty) and waits for it
to complete (only if the file size is not aligned with the filesystem's
sector size). This is being fixed by another patch and is independent of
this change (that patch's title is "Btrfs: skip writeback of last page
when truncating file to same size").
The following script was used to measure time spent by a receiver without
this change applied, with this change applied, and without this change and
with the truncate fix applied (the fix to not make it start and wait for
writeback to complete).
Filipe Manana [Tue, 6 Feb 2018 20:40:31 +0000 (20:40 +0000)]
Btrfs: skip writeback of last page when truncating file to same size
When we truncate a file to the same size and that size is not aligned
with the sector size, we end up triggering writeback (and wait for it to
complete) of the last page. This is unncessary as we can not have delayed
allocation beyond the inode's i_size and the goal of truncating a file
to its own size is to discard prealloc extents (allocated via the
fallocate(2) system call). Besides the unnecessary IO start and wait, it
also breaks the oppurtunity for larger contiguous extents on disk, as
before the last dirty page there might be other dirty pages.
This scenario is probably not very common in general, however it is
common for btrfs receive implementations because currently the send
stream always issues a truncate operation for each processed inode as
the last operation for that inode (this truncate operation is not
always needed and the send implementation will be addressed to avoid
them).
So improve this by not starting and waiting for writeback of the inode's
last page when we are truncating to exactly the same size.
The following script was used to quickly measure the time a receive
operation takes:
Anand Jain [Mon, 26 Feb 2018 08:46:05 +0000 (16:46 +0800)]
btrfs: unify types for metadata_ratio and data_chunk_allocations
We have btrfs_fs_info::data_chunk_allocations and
btrfs_fs_info::metadata_ratio declared as unsigned which would be
unsinged int and kernel style prefers unsigned int over bare unsigned.
So this patch changes them to u32.
Signed-off-by: Anand Jain <anand.jain@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
Nikolay Borisov [Wed, 14 Feb 2018 08:53:36 +0000 (10:53 +0200)]
btrfs: Remove redundant memory barriers around dio_private error status
Using any kind of memory barriers around atomic operations which have
a return value is redundant, since those operations themselves are
fully ordered. atomic_t.txt states:
- RMW operations that have a return value are fully ordered;
Fully ordered primitives are ordered against everything prior and
everything subsequent. Therefore a fully ordered primitive is like
having an smp_mb() before and an smp_mb() after the primitive.
Given this let's replace the extra memory barriers with comments.
Signed-off-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Anand Jain [Tue, 20 Feb 2018 14:50:36 +0000 (22:50 +0800)]
btrfs: remove assert in btrfs_init_dev_replace_tgtdev()
In the same function we just ran btrfs_alloc_device() which means the
btrfs_device::resized_list is sure to be empty and we are protected
with the btrfs_fs_info::volume_mutex.
Signed-off-by: Anand Jain <anand.jain@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
David Sterba [Mon, 19 Feb 2018 16:24:18 +0000 (17:24 +0100)]
btrfs: add more __cold annotations
The __cold functions are placed to a special section, as they're
expected to be called rarely. This could help i-cache prefetches or help
compiler to decide which branches are more/less likely to be taken
without any other annotations needed.
Though we can't add more __exit annotations, it's still possible to add
__cold (that's also added with __exit). That way the following function
categories are tagged:
David Sterba [Mon, 19 Feb 2018 16:24:15 +0000 (17:24 +0100)]
btrfs: add (the only possible) __exit annotation
Recently, the __init annotations have been added. There's unfortunatelly
only one case where we can add __exit, because most of the cleanup
helpers are also called from the __init phase.
As the __exit annotated functions get discarded completely for a
built-in code, we'd miss them from the init phase.
Anand Jain [Wed, 14 Feb 2018 17:11:37 +0000 (01:11 +0800)]
btrfs: verify subvolid mount parameter
We aren't verifying the parameter passed to the subvolid mount option,
so we won't report and fail the mount if a junk value is specified for
example, -o subvolid=abc.
This patch verifies the subvolid option with match_u64.
Up to now the memparse function accepts the K/M/G/ suffixes, that are
usually meant for size values and do not make sense for a subvolume it.
Signed-off-by: Anand Jain <anand.jain@oracle.com> Reviewed-by: David Sterba <dsterba@suse.com>
[ update changelog ] Signed-off-by: David Sterba <dsterba@suse.com>
Liu Bo [Thu, 1 Feb 2018 00:09:13 +0000 (17:09 -0700)]
Btrfs: fix unexpected cow in run_delalloc_nocow
Fstests generic/475 provides a way to fail metadata reads while
checking if checksum exists for the inode inside run_delalloc_nocow(),
and csum_exist_in_range() interprets error (-EIO) as inode having
checksum and makes its caller enter the cow path.
In case of free space inode, this ends up with a warning in
cow_file_range().
The same problem applies to btrfs_cross_ref_exist() since it may also
read metadata in between.
With this, run_delalloc_nocow() bails out when errors occur at the two
places.
cc: <stable@vger.kernel.org> v2.6.28+ Fixes: 17d217fe970d ("Btrfs: fix nodatasum handling in balancing code") Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
Nikolay Borisov [Mon, 8 Jan 2018 09:45:05 +0000 (11:45 +0200)]
btrfs: Remove custom crc32c init code
The custom crc32 init code was introduced in 14a958e678cd ("Btrfs: fix btrfs boot when compiled as built-in") to
enable using btrfs as a built-in. However, later as pointed out by 60efa5eb2e88 ("Btrfs: use late_initcall instead of module_init") this
wasn't enough and finally btrfs was switched to late_initcall which
comes after the generic crc32c implementation is initiliased. The
latter commit superseeded the former. Now that we don't have to
maintain our own code let's just remove it and switch to using the
generic implementation.
Despite touching a lot of files the patch is really simple. Here is the gist of
the changes:
1. Select LIBCRC32C rather than the low-level modules.
2. s/btrfs_crc32c/crc32c/g
3. replace hash.h with linux/crc32c.h
4. Move the btrfs namehash funcs to ctree.h and change the tree accordingly.
I've tested this with btrfs being both a module and a built-in and xfstest
doesn't complain.
Does seem to fix the longstanding problem of not automatically selectiong
the crc32c module when btrfs is used. Possibly there is a workaround in
dracut.
The modinfo confirms that now all the module dependencies are there:
Signed-off-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: David Sterba <dsterba@suse.com>
[ add more info to changelog from mails ] Signed-off-by: David Sterba <dsterba@suse.com>
projects / mirror_ubuntu-kernels.git / log