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>
Nikolay Borisov [Mon, 8 Jan 2018 09:45:04 +0000 (11:45 +0200)]
libcrc32c: Add crc32c_impl function
This function returns a string with the currently in-use implementation
of the crc32c algorithm, i.e crc32c-generic (for unoptimised, generic
implementation) or crc32c-intel for the sse optimised version. This
will be used by btrfs.
Signed-off-by: Nikolay Borisov <nborisov@suse.com> Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
[ use crypto_shash_driver_name as suggested by Herbert ] Signed-off-by: David Sterba <dsterba@suse.com>
Qu Wenruo [Tue, 30 Jan 2018 10:20:45 +0000 (18:20 +0800)]
btrfs: Refactor __get_raid_index() to btrfs_bg_flags_to_raid_index()
Function __get_raid_index() is used to convert block group flags into
raid index, which can be used to get various info directly from
btrfs_raid_array[].
Refactor this function a little:
1) Rename to btrfs_bg_flags_to_raid_index()
Double underline prefix is normally for internal functions, while the
function is used by both extent-tree and volumes.
Although the name is a little longer, but it should explain its usage
quite well.
2) Move it to volumes.h and make it static inline
Just several if-else branches, really no need to define it as a normal
function.
This also makes later code re-use between kernel and btrfs-progs
easier.
3) Remove function get_block_group_index()
Really no need to do such a simple thing as an exported function.
Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: Anand Jain <anand.jain@oracle.com> Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Nikolay Borisov [Wed, 31 Jan 2018 08:52:04 +0000 (10:52 +0200)]
btrfs: Move qgroup rescan on quota enable to btrfs_quota_enable
Currently btrfs_run_qgroups is doing a bit too much. Not only is it
responsible for synchronizing in-memory state of qgroups to disk but
it also contains code to trigger the initial qgroup rescan when
quota is enabled initially. This condition is detected by checking that
BTRFS_FS_QUOTA_ENABLED is not set and BTRFS_FS_QUOTA_ENABLING is set.
Nothing really requires from the code to be structured (and scattered)
the way it is so let's streamline things. First move the quota rescan
code into btrfs_quota_enable, where its invocation is closer to the
use. This also makes the FS_QUOTA_ENABLING flag redundant so let's
remove it as well.
This has been tested with a full xfstest run with qgroups enabled on
the scratch device of every xfstest and no regressions were observed.
Signed-off-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Gu JinXiang [Thu, 11 Jan 2018 08:12:18 +0000 (16:12 +0800)]
btrfs: use reada direction enum instead of constant value in load_free_space_tree
load_free_space_tree calls either function load_free_space_bitmaps or
load_free_space_extents. And either of those two will lead to call
btrfs_next_item. So in function load_free_space_tree, use READA_FORWARD
to read forward ahead.
This also changes the value from READA_BACK to READA_FORWARD, since
according to the logic, it should reada_for_search forward, not
backward.
Signed-off-by: Gu JinXiang <gujx@cn.fujitsu.com> Reviewed-by: Nikolay Borisov <nborisov@suse.com>
[ update changelog ] Signed-off-by: David Sterba <dsterba@suse.com>
Gu Jinxiang [Thu, 11 Jan 2018 08:12:17 +0000 (16:12 +0800)]
btrfs: use reada direction enum instead of constant value in populate_free_space_tree
populate_free_space_tree calls function btrfs_search_slot_for_read with
parameter int find_higher = 1, it means that, if no exact match is
found, then use the next higher item. So in function
populate_free_space_tree, use READA_FORWARD to read forward ahead.
This also changes the value from READA_BACK to READA_FORWARD, since
according to the logic, it should reada_for_search forward, not
backward.
Signed-off-by: Gu JinXiang <gujx@cn.fujitsu.com> Reviewed-by: Nikolay Borisov <nborisov@suse.com>
[ update changelog ] Signed-off-by: David Sterba <dsterba@suse.com>
Nikolay Borisov [Tue, 16 Jan 2018 07:31:58 +0000 (09:31 +0200)]
btrfs: Remove btrfs_inode::delayed_iput_count
delayed_iput_count wa supposed to be used to implement, well, delayed
iput. The idea is that we keep accumulating the number of iputs we do
until eventually the inode is deleted. Turns out we never really
switched the delayed_iput_count from 0 to 1, hence all conditional
code relying on the value of that member being different than 0 was
never executed. This, as it turns out, didn't cause any problem due
to the simple fact that the generic inode's i_count member was always
used to count the number of iputs. So let's just remove the unused
member and all unused code. This patch essentially provides no
functional changes. While at it, also add proper documentation for
btrfs_add_delayed_iput
Signed-off-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: David Sterba <dsterba@suse.com>
[ reformat comment ] Signed-off-by: David Sterba <dsterba@suse.com>
The behavior of btrfs_delalloc_reserve_metadata depends on whether
the inode we are allocating for is the freespace inode or not. As it
stands if we are the free node we set 'flush' and 'delalloc_lock'
variable to certain values. Subsequently we check the values of those
vars and act accordingly. Instead, simplify things by having 1 if
which checks whether we are the freespace inode or not and do any
specific operation in either branches of that if. This makes the code
a bit easier to understand, as an added bonus it also shrinks the
compiled size:
add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-17 (-17)
Function old new delta
btrfs_delalloc_reserve_metadata 1876 1859 -17
Total: Before=85966, After=85949, chg -0.02%
No functional changes.
Signed-off-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: Edmund Nadolski <enadolski@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Anand Jain [Mon, 22 Jan 2018 22:49:36 +0000 (14:49 -0800)]
btrfs: keep device list sorted
By maintaining the device list sorted lets us reproduce the problems
related to missing chunk in the degraded mode much more consistent. So
fix this by sorting the devices by devid within the kernel. So that we
know which device is assigned to the struct fs_info::latest_bdev when
all the devices are having and same SB generation.
Signed-off-by: Anand Jain <anand.jain@oracle.com> Reviewed-by: Nikolay Borisov <nborisov@suse.com>
[ update changelog ] Signed-off-by: David Sterba <dsterba@suse.com>
Nikolay Borisov [Tue, 23 Jan 2018 12:46:53 +0000 (14:46 +0200)]
btrfs: Use schedule_timeout_interruptible
Instead of manually fiddling with the state of the task
(RUNNING->INTERRUPTIBLE->RUNNING) again just use schedule_timeout_interruptible
which adjusts the task state as needed. No functional changes.
Signed-off-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: Josef Bacik <jbacik@fb.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Nikolay Borisov [Fri, 9 Feb 2018 09:30:18 +0000 (11:30 +0200)]
btrfs: Move error handling of btrfs_start_dirty_block_groups closer to call site
Even though btrfs_start_dirty_block_groups is fairly in the beginning of
btrfs_commit_transaction outside of the critical section defined by the
transaction states it can only be run by a single comitter. In other
words it defines its own critical section thanks to the
BTRFS_TRANS_DIRTY_BG run flag and ro_block_group_mutex. However, its
error handling is outside of this critical section which is a bit
counter-intuitive. So move the error handling righ after the function is
executed and let the sole runner of dirty block groups handle the return
value. 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>
Nikolay Borisov [Fri, 15 Dec 2017 10:05:37 +0000 (12:05 +0200)]
btrfs: Add enospc_debug printing in metadata_reserve_bytes
Currently when enospc_debug mount option is turned on we do not print
any debug info in case metadata reservation failures happen. Fix this
by adding the necessary hook in reserve_metadata_bytes.
Signed-off-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Nikolay Borisov [Thu, 8 Feb 2018 16:25:18 +0000 (18:25 +0200)]
btrfs: Document consistency of transaction->io_bgs list
The reason why io_bgs can be modified without holding any lock is
non-obvious. Document it and reference that documentation from the
respective call sites.
Signed-off-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Nikolay Borisov [Thu, 8 Feb 2018 16:25:17 +0000 (18:25 +0200)]
btrfs: Remove invalid null checks from btrfs_cleanup_dirty_bgs
list_first_entry is essentially a wrapper over cotnainer_of. The latter
can never return null even if it's working on inconsistent list since it
will either crash or return some offset in the wrong struct.
Additionally, for the dirty_bgs list the iteration is done under
dirty_bgs_lock which ensures consistency of the list.
Signed-off-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
Anand Jain [Tue, 13 Feb 2018 03:53:43 +0000 (11:53 +0800)]
btrfs: log, when replace, is canceled by the user
For debugging or administration purposes, we would want to know if and
when the user cancels the replace, to complement the existing messages
when dev-replace starts or finishes.
Signed-off-by: Anand Jain <anand.jain@oracle.com> Reviewed-by: David Sterba <dsterba@suse.com>
[ update changelog, fold fix for RCU warning from Nikolay ] Signed-off-by: David Sterba <dsterba@suse.com>
Anand Jain [Sat, 24 Feb 2018 11:43:56 +0000 (19:43 +0800)]
btrfs: fix null pointer deref when target device is missing
The replace target device can be missing when mounted with -o degraded,
but we wont allocate a missing btrfs_device to it. So check the device
before accessing.
This patch has been moved in front of patch "btrfs: log, when replace,
is canceled by the user" that could reproduce the crash if the system
reboots inside btrfs_dev_replace_start before the
btrfs_dev_replace_finishing call.
$ mkfs /dev/sda
$ mount /dev/sda mnt
$ btrfs replace start /dev/sda /dev/sdb
<insert reboot>
$ mount po degraded /dev/sdb mnt
<crash>
Signed-off-by: Anand Jain <anand.jain@oracle.com>
[ added reproducer description from mail ] Signed-off-by: David Sterba <dsterba@suse.com>
Anand Jain [Tue, 13 Feb 2018 04:35:44 +0000 (12:35 +0800)]
btrfs: extent_buffer_uptodate() make it static and inline
extent_buffer_uptodate() is a trivial wrapper around test_bit() and
nothing else. So make it static and inline, save on code space and call
indirection.
Before:
text data bss dec hex filename 1131257 82898 18992 1233147 12d0fb fs/btrfs/btrfs.ko
After:
text data bss dec hex filename 1131090 82898 18992 1232980 12d054 fs/btrfs/btrfs.ko
Signed-off-by: Anand Jain <anand.jain@oracle.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 [Wed, 7 Feb 2018 15:55:49 +0000 (17:55 +0200)]
btrfs: Remove fs_info argument from btrfs_update_commit_device_bytes_used
We already pass the btrfs_transaction which references fs_info so no
need to pass the later as an argument. Also use the opportunity to
shorten transaction->trans. No functional changes.
Signed-off-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Nikolay Borisov [Wed, 7 Feb 2018 15:55:48 +0000 (17:55 +0200)]
btrfs: Remove fs_info argument from create_pending_snapshots/create_pending_snapshot
We already pass the trans handle which has a reference to fs_info to
create_pending_snapshot so we can refer to it directly. Doing this
obviates the need to pass the fs_info to create_pending_snapshots as
well. No functional changes.
Signed-off-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
projects / mirror_ubuntu-kernels.git / log