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md: add exact bitmap mapping and reshape hooks

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Add bitmap mapping and reshape hooks needed by llbitmap reshape
support without teaching md core to account a single bio against
multiple bitmap ranges.

This also adds the old/new bitmap geometry helpers used by
personalities to describe reshape mapping to llbitmap.

Tested-by: Mykola Marzhan <mykola@meshstor.io>
Link: https://patch.msgid.link/20260802195038.164272-13-yukuai@kernel.org
Signed-off-by: Yu Kuai <yukuai@fygo.io>
This commit is contained in:
Yu Kuai
2026-08-03 03:50:21 +08:00
parent ffd3e73d6e
commit 1ee6fef6e0
5 changed files with 36 additions and 3 deletions
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8
drivers/md/md-bitmap.c
View File

@@ -1730,6 +1730,13 @@ static void bitmap_start_write(struct mddev *mddev, sector_t offset,
}
}
static void bitmap_prepare_range(struct mddev *mddev, sector_t *offset,
unsigned long *sectors)
{
if (mddev->pers->bitmap_sector)
mddev->pers->bitmap_sector(mddev, offset, sectors);
}
static void bitmap_end_write(struct mddev *mddev, sector_t offset,
unsigned long sectors)
{
@@ -3081,6 +3088,7 @@ static struct bitmap_operations bitmap_ops = {
.flush = bitmap_flush,
.write_all = bitmap_write_all,
.dirty_bits = bitmap_dirty_bits,
.prepare_range = bitmap_prepare_range,
.unplug = bitmap_unplug,
.daemon_work = bitmap_daemon_work,

8
drivers/md/md-bitmap.h
View File

@@ -94,6 +94,14 @@ struct bitmap_operations {
void (*write_all)(struct mddev *mddev);
void (*dirty_bits)(struct mddev *mddev, unsigned long s,
unsigned long e);
/* Prepare a range for this bitmap implementation. */
void (*prepare_range)(struct mddev *mddev,
sector_t *offset,
unsigned long *sectors);
void (*reshape_finish)(struct mddev *mddev);
int (*reshape_can_start)(struct mddev *mddev);
void (*reshape_mark)(struct mddev *mddev, sector_t old_pos,
sector_t new_pos);
void (*unplug)(struct mddev *mddev, bool sync);
void (*daemon_work)(struct mddev *mddev);

8
drivers/md/md-llbitmap.c
View File

@@ -1198,6 +1198,13 @@ static void llbitmap_destroy(struct mddev *mddev)
mutex_unlock(&mddev->bitmap_info.mutex);
}
static void llbitmap_prepare_range(struct mddev *mddev, sector_t *offset,
unsigned long *sectors)
{
if (mddev->pers->bitmap_sector)
mddev->pers->bitmap_sector(mddev, offset, sectors);
}
static void llbitmap_start_write(struct mddev *mddev, sector_t offset,
unsigned long sectors)
{
@@ -1789,6 +1796,7 @@ static struct bitmap_operations llbitmap_ops = {
.update_sb = llbitmap_update_sb,
.get_stats = llbitmap_get_stats,
.dirty_bits = llbitmap_dirty_bits,
.prepare_range = llbitmap_prepare_range,
.write_all = llbitmap_write_all,
.groups = md_llbitmap_groups,

11
drivers/md/md.c
View File

@@ -9427,6 +9427,12 @@ struct bio *mddev_bio_split_at_reshape_offset(struct mddev *mddev,
}
EXPORT_SYMBOL_GPL(mddev_bio_split_at_reshape_offset);
static void md_bitmap_prepare_range(struct mddev *mddev, sector_t *offset,
unsigned long *sectors)
{
mddev->bitmap_ops->prepare_range(mddev, offset, sectors);
}
static void md_bitmap_start(struct mddev *mddev,
struct md_io_clone *md_io_clone)
{
@@ -9434,9 +9440,8 @@ static void md_bitmap_start(struct mddev *mddev,
mddev->bitmap_ops->start_discard :
mddev->bitmap_ops->start_write;
if (mddev->pers->bitmap_sector)
mddev->pers->bitmap_sector(mddev, &md_io_clone->offset,
&md_io_clone->sectors);
md_bitmap_prepare_range(mddev, &md_io_clone->offset,
&md_io_clone->sectors);
if (!md_io_clone->sectors)
return;

4
drivers/md/md.h
View File

@@ -797,6 +797,10 @@ struct md_personality
/* convert io ranges from array to bitmap */
void (*bitmap_sector)(struct mddev *mddev, sector_t *offset,
unsigned long *sectors);
void (*bitmap_sector_map)(struct mddev *mddev, sector_t *offset,
unsigned long *sectors, bool previous);
sector_t (*bitmap_sync_size)(struct mddev *mddev, bool previous);
sector_t (*bitmap_array_sectors)(struct mddev *mddev, bool previous);
};
struct md_sysfs_entry {