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path: root/drivers/md/md-bitmap.h
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2025-09-06md/md-llbitmap: introduce new lockless bitmapYu Kuai1-1/+30
Redundant data is used to enhance data fault tolerance, and the storage method for redundant data vary depending on the RAID levels. And it's important to maintain the consistency of redundant data. Bitmap is used to record which data blocks have been synchronized and which ones need to be resynchronized or recovered. Each bit in the bitmap represents a segment of data in the array. When a bit is set, it indicates that the multiple redundant copies of that data segment may not be consistent. Data synchronization can be performed based on the bitmap after power failure or readding a disk. If there is no bitmap, a full disk synchronization is required. Due to known performance issues with md-bitmap and the unreasonable implementations: - self-managed IO submitting like filemap_write_page(); - global spin_lock I have decided not to continue optimizing based on the current bitmap implementation, this new bitmap is invented without locking from IO fast path and can be used with fast disks. For designs and details, see the comments in drivers/md-llbitmap.c. Link: https://lore.kernel.org/linux-raid/20250829080426.1441678-12-yukuai1@huaweicloud.com Signed-off-by: Yu Kuai <yukuai3@huawei.com> Reviewed-by: Li Nan <linan122@huawei.com>
2025-09-06md/md-bitmap: add a new method blocks_synced() in bitmap_operationsYu Kuai1-0/+1
Currently, raid456 must perform a whole array initial recovery to build initail xor data, then IO to the array won't have to read all the blocks in underlying disks. This behavior will affect IO performance a lot, and nowadays there are huge disks and the initial recovery can take a long time. Hence llbitmap will support lazy initial recovery in following patches. This method is used to check if data blocks is synced or not, if not then IO will still have to read all blocks for raid456. Link: https://lore.kernel.org/linux-raid/20250829080426.1441678-9-yukuai1@huaweicloud.com Signed-off-by: Yu Kuai <yukuai3@huawei.com>
2025-09-06md/md-bitmap: add a new method skip_sync_blocks() in bitmap_operationsYu Kuai1-0/+1
This method is used to check if blocks can be skipped before calling into pers->sync_request(), llbitmap will use this method to skip resync for unwritten/clean data blocks, and recovery/check/repair for unwritten data blocks; Link: https://lore.kernel.org/linux-raid/20250829080426.1441678-8-yukuai1@huaweicloud.com Signed-off-by: Yu Kuai <yukuai3@huawei.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Xiao Ni <xni@redhat.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Li Nan <linan122@huawei.com>
2025-09-06md/md-bitmap: support discard for bitmap opsYu Kuai1-4/+8
Use two new methods {start, end}_discard in bitmap_ops and a new field 'rw' in struct md_io_clone to handle discard IO, prepare to support new md bitmap. Since all bitmap functions to hanlde write IO are the same, also add typedef to make code cleaner. Link: https://lore.kernel.org/linux-raid/20250829080426.1441678-4-yukuai1@huaweicloud.com Signed-off-by: Yu Kuai <yukuai3@huawei.com> Reviewed-by: Xiao Ni <xni@redhat.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Li Nan <linan122@huawei.com>
2025-09-06md/md-bitmap: introduce CONFIG_MD_BITMAPYu Kuai1-2/+15
Now that all implementations are internal, it's sensible to add a config option for md-bitmap, and it's a good way for isolation. Link: https://lore.kernel.org/linux-raid/20250707012711.376844-16-yukuai1@huaweicloud.com Signed-off-by: Yu Kuai <yukuai3@huawei.com> Reviewed-by: Xiao Ni <xni@redhat.com>
2025-09-06md/md-bitmap: handle the case bitmap is not enabled before end_sync()Yu Kuai1-0/+11
This case can be handled without knowing internal implementation. Prepare to introduce CONFIG_MD_BITMAP. Link: https://lore.kernel.org/linux-raid/20250707012711.376844-9-yukuai1@huaweicloud.com Signed-off-by: Yu Kuai <yukuai3@huawei.com> Reviewed-by: Xiao Ni <xni@redhat.com>
2025-09-06md/md-bitmap: handle the case bitmap is not enabled before start_sync()Yu Kuai1-0/+12
This case can be handled without knowing internal implementation. Prepare to introduce CONFIG_MD_BITMAP. Link: https://lore.kernel.org/linux-raid/20250707012711.376844-8-yukuai1@huaweicloud.com Signed-off-by: Yu Kuai <yukuai3@huawei.com> Reviewed-by: Xiao Ni <xni@redhat.com>
2025-09-06md/md-bitmap: add md_bitmap_registered/enabled() helperYu Kuai1-1/+18
There are no functional changes, prepare to handle the case that mddev->bitmap_ops can be NULL, which is possible after introducing CONFIG_MD_BITMAP. Link: https://lore.kernel.org/linux-raid/20250707012711.376844-7-yukuai1@huaweicloud.com Signed-off-by: Yu Kuai <yukuai3@huawei.com> Reviewed-by: Xiao Ni <xni@redhat.com>
2025-09-06md/md-bitmap: add a new parameter 'flush' to bitmap_ops->enabledYu Kuai1-1/+1
The method is only used from raid1/raid10 IO path, to check if write bio should be pluged, the parameter is always set to true for now, following patch will use this helper in other context like updating superblock. Link: https://lore.kernel.org/linux-raid/20250707012711.376844-6-yukuai1@huaweicloud.com Signed-off-by: Yu Kuai <yukuai3@huawei.com> Reviewed-by: Xiao Ni <xni@redhat.com>
2025-09-06md/md-bitmap: merge md_bitmap_group into bitmap_operationsYu Kuai1-0/+2
Now that all bitmap implementations are internal, it doesn't make sense to export md_bitmap_group anymore. Link: https://lore.kernel.org/linux-raid/20250707012711.376844-5-yukuai1@huaweicloud.com Signed-off-by: Yu Kuai <yukuai3@huawei.com> Reviewed-by: Xiao Ni <xni@redhat.com>
2025-09-06md/md-bitmap: remove the parameter 'init' for bitmap_ops->resize()Yu Kuai1-2/+1
It's set to 'false' for all callers, hence it's useless and can be removed. Link: https://lore.kernel.org/linux-raid/20250707012711.376844-3-yukuai1@huaweicloud.com Signed-off-by: Yu Kuai <yukuai3@huawei.com> Reviewed-by: Xiao Ni <xni@redhat.com>
2025-05-30md/md-bitmap: remove parameter slot from bitmap_create()Yu Kuai1-1/+1
All callers pass in '-1' for 'slot', hence it can be removed. Link: https://lore.kernel.org/linux-raid/20250524061320.370630-6-yukuai1@huaweicloud.com Signed-off-by: Yu Kuai <yukuai3@huawei.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Xiao Ni <xni@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de>
2025-05-30md/md-bitmap: cleanup bitmap_ops->startwrite()Yu Kuai1-3/+3
bitmap_startwrite() always return 0, and the caller doesn't check return value as well, hence change the method to void. Also rename startwrite/endwrite to start_write/end_write, which is more in line with the usual naming convention. Link: https://lore.kernel.org/linux-raid/20250524061320.370630-4-yukuai1@huaweicloud.com Signed-off-by: Yu Kuai <yukuai3@huawei.com> Reviewed-by: Xiao Ni <xni@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de>
2025-05-30md/dm-raid: remove max_write_behind setting limitYu Kuai1-9/+0
The comments said 'vaule in kB', while the value actually means the number of write_behind IOs. And since md-bitmap will automatically adjust the value to max COUNTER_MAX / 2, there is no need to fail early. Also move some macros that is only used md-bitmap.c. Link: https://lore.kernel.org/linux-raid/20250524061320.370630-15-yukuai1@huaweicloud.com Signed-off-by: Yu Kuai <yukuai3@huawei.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Xiao Ni <xni@redhat.com>
2025-01-13md/md-bitmap: remove the last parameter for bimtap_ops->endwrite()Yu Kuai1-1/+1
For the case that IO failed for one rdev, the bit will be mark as NEEDED in following cases: 1) If badblocks is set and rdev is not faulty; 2) If rdev is faulty; Case 1) is useless because synchronize data to badblocks make no sense. Case 2) can be replaced with mddev->degraded. Also remove R1BIO_Degraded, R10BIO_Degraded and STRIPE_DEGRADED since case 2) no longer use them. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20250109015145.158868-3-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2025-01-13md/md-bitmap: factor behind write counters out from bitmap_{start/end}write()Yu Kuai1-2/+5
behind_write is only used in raid1, prepare to refactor bitmap_{start/end}write(), there are no functional changes. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Reviewed-by: Xiao Ni <xni@redhat.com> Link: https://lore.kernel.org/r/20250109015145.158868-2-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: make in memory structure internalYu Kuai1-183/+6
Now that struct bitmap_page and bitmap is not used externally anymore, move them from md-bitmap.h to md-bitmap.c (expect that dm-raid is still using define marco 'COUNTER_MAX'). Also fix some checkpatch warnings. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-43-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: merge md_bitmap_enabled() into bitmap_operationsYu Kuai1-7/+1
So that the implementation won't be exposed, and it'll be possible to invent a new bitmap by replacing bitmap_operations. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-42-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: merge md_bitmap_wait_behind_writes() into bitmap_operationsYu Kuai1-3/+1
So that the implementation won't be exposed, and it'll be possible to invent a new bitmap by replacing bitmap_operations. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-41-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: merge md_bitmap_free() into bitmap_operationsYu Kuai1-2/+1
So that the implementation won't be exposed, and it'll be possible o invent a new bitmap by replacing bitmap_operations. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-40-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: merge md_bitmap_set_pages() into struct bitmap_operationsYu Kuai1-1/+1
o that the implementation won't be exposed, and it'll be possible o invent a new bitmap by replacing bitmap_operations. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-39-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: merge md_bitmap_copy_from_slot() into struct bitmap_operation.Yu Kuai1-2/+2
So that the implementation won't be exposed, and it'll be possible to invent a new bitmap by replacing bitmap_operations. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-38-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: merge get_bitmap_from_slot() into bitmap_operationsYu Kuai1-1/+1
So that the implementation won't be exposed, and it'll be possible to invent a new bitmap by replacing bitmap_operations. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-37-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: merge md_bitmap_resize() into bitmap_operationsYu Kuai1-2/+3
So that the implementation won't be exposed, and it'll be possible to invent a new bitmap by replacing bitmap_operations. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-36-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: pass in mddev directly for md_bitmap_resize()Yu Kuai1-2/+2
And move the condition "if (mddev->bitmap)" into md_bitmap_resize() as well, on the one hand make code cleaner, on the other hand try not to access bitmap directly. Since we are here, also change the parameter 'init' from int to bool. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-35-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: merge md_bitmap_daemon_work() into bitmap_operationsYu Kuai1-1/+1
So that the implementation won't be exposed, and it'll be possible to invent a new bitmap by replacing bitmap_operations. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-34-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: merge bitmap_unplug() into bitmap_operationsYu Kuai1-1/+1
So that the implementation won't be exposed, and it'll be possible to invent a new bitmap by replacing bitmap_operations. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-33-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: merge md_bitmap_unplug_async() into md_bitmap_unplug()Yu Kuai1-2/+1
Add a parameter 'bool sync' to distinguish them, and md_bitmap_unplug_async() won't be exported anymore, hence bitmap_operations only need one op to cover them. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-32-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: merge md_bitmap_sync_with_cluster() into bitmap_operationsYu Kuai1-4/+4
So that the implementation won't be exposed, and it'll be possible to invent a new bitmap by replacing bitmap_operations. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-31-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: merge md_bitmap_cond_end_sync() into bitmap_operationsYu Kuai1-1/+1
So that the implementation won't be exposed, and it'll be possible to invent a new bitmap by replacing bitmap_operations. Also change the parameter from bitmap to mddev, to avoid access bitmap outside md-bitmap.c as much as possible. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-30-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: merge md_bitmap_close_sync() into bitmap_operationsYu Kuai1-1/+1
So that the implementation won't be exposed, and it'll be possible to invent a new bitmap by replacing bitmap_operations. Also change the parameter from bitmap to mddev, to avoid access bitmap outside md-bitmap.c as much as possible. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-29-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: merge md_bitmap_end_sync() into bitmap_operationsYu Kuai1-2/+1
So that the implementation won't be exposed, and it'll be possible to invent a new bitmap by replacing bitmap_operations. Also change the parameter from bitmap to mddev, to avoid access bitmap outside md-bitmap.c as much as possible. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-28-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: remove the parameter 'aborted' for md_bitmap_end_sync()Yu Kuai1-1/+2
For internal callers, aborted are always set to false, while for external callers, aborted are always set to true. Hence there is no need to always pass in true for exported api. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-27-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: merge md_bitmap_start_sync() into bitmap_operationsYu Kuai1-1/+2
So that the implementation won't be exposed, and it'll be possible to invent a new bitmap by replacing bitmap_operations. Also change the parameter from bitmap to mddev, to avoid access bitmap outside md-bitmap.c as much as possible. Also fix lots of code style. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-26-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: merge md_bitmap_endwrite() into bitmap_operationsYu Kuai1-2/+2
So that the implementation won't be exposed, and it'll be possible to invent a new bitmap by replacing bitmap_operations. Also change the parameter from bitmap to mddev, to avoid access bitmap outside md-bitmap.c as much as possible. And change the type of 'success' and 'behind' from int to bool. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-25-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: merge md_bitmap_startwrite() into bitmap_operationsYu Kuai1-2/+3
So that the implementation won't be exposed, and it'll be possible to invent a new bitmap by replacing bitmap_operations. Also change the parameter from bitmap to mddev, to avoid access bitmap outside md-bitmap.c as much as possible. And change the type of 'behind' from int to bool. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-24-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: merge md_bitmap_dirty_bits() into bitmap_operationsYu Kuai1-4/+2
So that the implementation won't be exposed, and it'll be possible to invent a new bitmap by replacing bitmap_operations. Also change the parameter from bitmap to mddev, to avoid access bitmap outside md-bitmap.c as much as possible. And while we're here, also fix coding style for bitmap_store(). Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-23-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: merge bitmap_write_all() into bitmap_operationsYu Kuai1-2/+1
So that the implementation won't be exposed, and it'll be possible to invent a new bitmap by replacing bitmap_operations. Also change the parameter from bitmap to mddev, to avoid access bitmap outside md-bitmap.c as much as possible. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-22-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: remove md_bitmap_setallbits()Yu Kuai1-1/+0
md_bitmap_setallbits() is not used, hence can be removed. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-21-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: merge md_bitmap_status() into bitmap_operationsYu Kuai1-2/+1
So that the implementation won't be exposed, and it'll be possible to invent a new bitmap by replacing bitmap_operations. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-20-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: merge md_bitmap_update_sb() into bitmap_operationsYu Kuai1-1/+2
So that the implementation won't be exposed, and it'll be possible to invent a new bitmap by replacing bitmap_operations. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-19-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: make md_bitmap_print_sb() internalYu Kuai1-1/+0
md_bitmap_print_sb() is only used inside md-bitmap.c, hence make it static, also rename it to bitmap_print_sb. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-18-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: merge md_bitmap_flush() into bitmap_operationsYu Kuai1-1/+1
So that the implementation won't be exposed, and it'll be possible to invent a new bitmap by replacing bitmap_operations. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-17-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: merge md_bitmap_destroy() into bitmap_operationsYu Kuai1-1/+1
So that the implementation won't be exposed, and it'll be possible to invent a new bitmap by replacing bitmap_operations. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-16-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: merge md_bitmap_load() into bitmap_operationsYu Kuai1-1/+1
So that the implementation won't be exposed, and it'll be possible to invent a new bitmap by replacing bitmap_operations. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-15-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: merge md_bitmap_create() into bitmap_operationsYu Kuai1-1/+1
So that the implementation won't be exposed, and it'll be possible to invent a new bitmap by replacing bitmap_operations. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-14-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: simplify md_bitmap_create() + md_bitmap_load()Yu Kuai1-1/+1
Other than internal api get_bitmap_from_slot(), all other places will set returned bitmap to mddev->bitmap. So move the setting of mddev->bitmap into md_bitmap_create() to simplify code. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-13-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: introduce struct bitmap_operationsYu Kuai1-0/+4
The structure is empty for now, and will be used in later patches to merge in bitmap operations, so that bitmap implementation won't be exposed. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-12-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: add a new helper md_bitmap_set_pages()Yu Kuai1-0/+1
Currently md-cluster will set bitmap->counts.pages directly, add a helper to do this to avoid dereferencing bitmap directly. Noted that after this patch bitmap is not dereferenced directly anymore and following patches will move the structure inside md-bitmap.c. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-11-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
2024-08-27md/md-bitmap: add 'behind_writes' and 'behind_wait' into struct md_bitmap_statsYu Kuai1-0/+3
There are no functional changes, avoid dereferencing bitmap directly to prepare inventing a new bitmap. Also fix following checkpatch warning by using wq_has_sleeper(). WARNING: waitqueue_active without comment Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240826074452.1490072-9-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
generated by cgit v1.2.3 (git 2.39.0) at 2025-10-18 17:13:14 +0300