btrfs: subpage: introduce helpers for writeback status

Introduces the following functions to handle subpage writeback status:

- btrfs_subpage_set_writeback()
- btrfs_subpage_clear_writeback()
- btr

btrfs: subpage: introduce helpers for writeback status

Introduces the following functions to handle subpage writeback status:

- btrfs_subpage_set_writeback()
- btrfs_subpage_clear_writeback()
- btrfs_subpage_test_writeback()
These helpers can only be called when the range is ensured to be
inside the page.

- btrfs_page_set_writeback()
- btrfs_page_clear_writeback()
- btrfs_page_test_writeback()
These helpers can handle both regular sector size and subpage without
problem.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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btrfs: subpage: introduce helpers for dirty status

Introduce the following functions to handle subpage dirty status:

- btrfs_subpage_set_dirty()
- btrfs_subpage_clear_dirty()
- btrfs_subpage_test_d

btrfs: subpage: introduce helpers for dirty status

Introduce the following functions to handle subpage dirty status:

- btrfs_subpage_set_dirty()
- btrfs_subpage_clear_dirty()
- btrfs_subpage_test_dirty()
These helpers can only be called when the range is ensured to be
inside the page.

- btrfs_page_set_dirty()
- btrfs_page_clear_dirty()
- btrfs_page_test_dirty()
These helpers can handle both regular sector size and subpage without
problem.
Thus they would be used to replace PageDirty() related calls in
later patches.

There is one special point to note here, just like set_page_dirty() and
clear_page_dirty_for_io(), btrfs_*page_set_dirty() and
btrfs_*page_clear_dirty() must be called with page locked.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Merge tag 'v5.12-rc7' into ecryptfs/next

Required to pick up idmapped mount changes which changed some function
parameters.

Merge tag 'v5.12-rc4' into next

Sync up with the mainline to bring in newest APIs.

Merge drm/drm-next into drm-misc-next

Noralf needs some patches in 5.12-rc3, and we've been delaying the 5.12
merge due to the swap issue so it looks like a good time.

Signed-off-by: Maxime Ripard

Merge drm/drm-next into drm-misc-next

Noralf needs some patches in 5.12-rc3, and we've been delaying the 5.12
merge due to the swap issue so it looks like a good time.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>

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Merge tag 'irqchip-fixes-5.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms into irq/urgent

Pull irqchip fixes from Marc Zyngier:

- More compatible strings for the Ingenic

Merge tag 'irqchip-fixes-5.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms into irq/urgent

Pull irqchip fixes from Marc Zyngier:

- More compatible strings for the Ingenic irqchip (introducing the
JZ4760B SoC)
- Select GENERIC_IRQ_MULTI_HANDLER on the ARM ep93xx platform
- Drop all GENERIC_IRQ_MULTI_HANDLER selections from the irqchip
Kconfig, now relying on the architecture to get it right
- Drop the debugfs_file field from struct irq_domain, now that
debugfs can track things on its own

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Merge drm/drm-next into drm-intel-next

Sync up with upstream.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>

Merge branch 'fixes-rc2' into fixes

Merge remote-tracking branch 'net/master'

Merge commit '3e10585335b7967326ca7b4118cada0d2d00a2ab' into v5.12/vfio/next

Update to new follow_pte() definition

Merge tag 'for-5.12-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux

Pull btrfs updates from David Sterba:
"This brings updates of space handling, performance improvements or bug

Merge tag 'for-5.12-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux

Pull btrfs updates from David Sterba:
"This brings updates of space handling, performance improvements or bug
fixes. The subpage block size and zoned mode features have reached
state where they're usable but with limitations.

Performance or related:

- do not block on deleted block group mutex in the cleaner, avoids
some long stalls

- improved flushing: make it work better with ticket space
reservations and avoid excessive transaction commits in some
scenarios, slightly improves throughput for random write load

- preemptive background flushing: separate the logic from ticket
reservations, improve the accounting and decisions when to flush in
low space conditions

- less lock contention related to running delayed refs, let just one
thread do the flushing when there are many inside transaction
commit

- dbench workload improvements: avoid unnecessary work when logging
inodes, fewer fallbacks to transaction commit and thus less waiting
for it (+7% throughput, -20% latency)

Core:

- subpage block size
- currently read-only support
- refactor and generalize code where sectorsize is assumed to be
page size, add the subpage handling everywhere
- the read-write support is on the way, page sizes are still
limited to 4K or 64K

- zoned mode, first working version but with limitations
- SMR/ZBC/ZNS friendly allocation mode, utilizing the "no fixed
location for structures" and chunked allocation
- superblock as the only fixed data structure needs special
handling, uses 2 consecutive zones as a ring buffer
- tree-log support with a dedicated block group to avoid unordered
writes
- emulated zones on non-zoned devices
- not yet working
- all non-single block group profiles, requires more zone write
pointer synchronization between the multiple block groups
- fitrim due to dependency on space cache, can be implemented

Fixes:

- ref-verify: proper tree owner and node level tracking

- fix pinned byte accounting, causing some early ENOSPC now more
likely due to other changes in delayed refs

Other:

- error handling fixes and improvements

- more error injection points

- more function documentation

- more and updated tracepoints

- subset of W=1 checked by default

- update comments to allow more automatic kdoc parameter checks"

* tag 'for-5.12-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux: (144 commits)
btrfs: zoned: enable to mount ZONED incompat flag
btrfs: zoned: deal with holes writing out tree-log pages
btrfs: zoned: reorder log node allocation on zoned filesystem
btrfs: zoned: serialize log transaction on zoned filesystems
btrfs: zoned: extend zoned allocator to use dedicated tree-log block group
btrfs: split alloc_log_tree()
btrfs: zoned: relocate block group to repair IO failure in zoned filesystems
btrfs: zoned: enable relocation on a zoned filesystem
btrfs: zoned: support dev-replace in zoned filesystems
btrfs: zoned: implement copying for zoned device-replace
btrfs: zoned: implement cloning for zoned device-replace
btrfs: zoned: mark block groups to copy for device-replace
btrfs: zoned: do not use async metadata checksum on zoned filesystems
btrfs: zoned: wait for existing extents before truncating
btrfs: zoned: serialize metadata IO
btrfs: zoned: introduce dedicated data write path for zoned filesystems
btrfs: zoned: enable zone append writing for direct IO
btrfs: zoned: use ZONE_APPEND write for zoned mode
btrfs: save irq flags when looking up an ordered extent
btrfs: zoned: cache if block group is on a sequential zone
...

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btrfs: integrate page status update for data read path into begin/end_page_read

In btrfs data page read path, the page status update are handled in two
different locations:

btrfs_do_read_page()

btrfs: integrate page status update for data read path into begin/end_page_read

In btrfs data page read path, the page status update are handled in two
different locations:

btrfs_do_read_page()
{
while (cur <= end) {
/* No need to read from disk */
if (HOLE/PREALLOC/INLINE){
memset();
set_extent_uptodate();
continue;
}
/* Read from disk */
ret = submit_extent_page(end_bio_extent_readpage);
}

end_bio_extent_readpage()
{
endio_readpage_uptodate_page_status();
}

This is fine for sectorsize == PAGE_SIZE case, as for above loop we
should only hit one branch and then exit.

But for subpage, there is more work to be done in page status update:

- Page Unlock condition
Unlike regular page size == sectorsize case, we can no longer just
unlock a page.
Only the last reader of the page can unlock the page.
This means, we can unlock the page either in the while() loop, or in
the endio function.

- Page uptodate condition
Since we have multiple sectors to read for a page, we can only mark
the full page uptodate if all sectors are uptodate.

To handle both subpage and regular cases, introduce a pair of functions
to help handling page status update:

- begin_page_read()
For regular case, it does nothing.
For subpage case, it updates the reader counters so that later
end_page_read() can know who is the last one to unlock the page.

- end_page_read()
This is just endio_readpage_uptodate_page_status() renamed.
The original name is a little too long and too specific for endio.

The new thing added is the condition for page unlock.
Now for subpage data, we unlock the page if we're the last reader.

This does not only provide the basis for subpage data read, but also
hide the special handling of page read from the main read loop.

Also, since we're changing how the page lock is handled, there are two
existing error paths where we need to manually unlock the page before
calling begin_page_read().

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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btrfs: introduce helpers for subpage error status

Introduce the following functions to handle subpage error status:

- btrfs_subpage_set_error()
- btrfs_subpage_clear_error()
- btrfs_subpage_test_er

btrfs: introduce helpers for subpage error status

Introduce the following functions to handle subpage error status:

- btrfs_subpage_set_error()
- btrfs_subpage_clear_error()
- btrfs_subpage_test_error()
These helpers can only be called when the page has subpage attached
and the range is ensured to be inside the page.

- btrfs_page_set_error()
- btrfs_page_clear_error()
- btrfs_page_test_error()
These helpers can handle both regular sector size and subpage without
problem.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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btrfs: introduce helpers for subpage uptodate status

Introduce the following functions to handle subpage uptodate status:

- btrfs_subpage_set_uptodate()
- btrfs_subpage_clear_uptodate()
- btrfs_sub

btrfs: introduce helpers for subpage uptodate status

Introduce the following functions to handle subpage uptodate status:

- btrfs_subpage_set_uptodate()
- btrfs_subpage_clear_uptodate()
- btrfs_subpage_test_uptodate()
These helpers can only be called when the page has subpage attached
and the range is ensured to be inside the page.

- btrfs_page_set_uptodate()
- btrfs_page_clear_uptodate()
- btrfs_page_test_uptodate()
These helpers can handle both regular sector size and subpage.
Although caller should still ensure that the range is inside the page.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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btrfs: support subpage for extent buffer page release

In btrfs_release_extent_buffer_pages(), we need to add extra handling
for subpage.

Introduce a helper, detach_extent_buffer_page(), to do diffe

btrfs: support subpage for extent buffer page release

In btrfs_release_extent_buffer_pages(), we need to add extra handling
for subpage.

Introduce a helper, detach_extent_buffer_page(), to do different
handling for regular and subpage cases.

For subpage case, handle detaching page private.

For unmapped (dummy or cloned) ebs, we can detach the page private
immediately as the page can only be attached to one unmapped eb.

For mapped ebs, we have to ensure there are no eb in the page range
before we delete it, as page->private is shared between all ebs in the
same page.

But there is a subpage specific race, where we can race with extent
buffer allocation, and clear the page private while new eb is still
being utilized, like this:

Extent buffer A is the new extent buffer which will be allocated,
while extent buffer B is the last existing extent buffer of the page.

T1 (eb A) | T2 (eb B)
-------------------------------+------------------------------
alloc_extent_buffer() | btrfs_release_extent_buffer_pages()
|- p = find_or_create_page() | |
|- attach_extent_buffer_page() | |
| | |- detach_extent_buffer_page()
| | |- if (!page_range_has_eb())
| | | No new eb in the page range yet
| | | As new eb A hasn't yet been
| | | inserted into radix tree.
| | |- btrfs_detach_subpage()
| | |- detach_page_private();
|- radix_tree_insert() |

Then we have a metadata eb whose page has no private bit.

To avoid such race, we introduce a subpage metadata-specific member,
btrfs_subpage::eb_refs.

In alloc_extent_buffer() we increase eb_refs in the critical section of
private_lock. Then page_range_has_eb() will return true for
detach_extent_buffer_page(), and will not detach page private.

The section is marked by:

- btrfs_page_inc_eb_refs()
- btrfs_page_dec_eb_refs()

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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btrfs: make attach_extent_buffer_page() handle subpage case

For subpage case, we need to allocate additional memory for each
metadata page.

So we need to:

- Allow attach_extent_buffer_page() to re

btrfs: make attach_extent_buffer_page() handle subpage case

For subpage case, we need to allocate additional memory for each
metadata page.

So we need to:

- Allow attach_extent_buffer_page() to return int to indicate allocation
failure

- Allow manually pre-allocate subpage memory for alloc_extent_buffer()
As we don't want to use GFP_ATOMIC under spinlock, we introduce
btrfs_alloc_subpage() and btrfs_free_subpage() functions for this
purpose.
(The simple wrap for btrfs_free_subpage() is for later convert to
kmem_cache. Already internally tested without problem)

- Preallocate btrfs_subpage structure for alloc_extent_buffer()
We don't want to call memory allocation with spinlock held, so
do preallocation before we acquire mapping->private_lock.

- Handle subpage and regular case differently in
attach_extent_buffer_page()
For regular case, no change, just do the usual thing.
For subpage case, allocate new memory or use the preallocated memory.

For future subpage metadata, we will make use of radix tree to grab
extent buffer.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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btrfs: introduce the skeleton of btrfs_subpage structure

For sectorsize < page size support, we need a structure to record extra
status info for each sector of a page.

Introduce the skeleton struct

btrfs: introduce the skeleton of btrfs_subpage structure

For sectorsize < page size support, we need a structure to record extra
status info for each sector of a page.

Introduce the skeleton structure, all subpage related code would go to
subpage.[ch].

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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