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Subject[PATCH 08/12] btrfs-progs: volume: align chunk allocation to zones
Date
To facilitate support for zoned block devices in the extent buffer
allocation, a zoned block device chunk is always aligned to a zone of the
device. With this, the zone write pointer location simply becomes a hint to
allocate new buffers.

Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
---
volumes.c | 79 ++++++++++++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 75 insertions(+), 4 deletions(-)

diff --git a/volumes.c b/volumes.c
index f6d1b1e9dc7f..64b42643390b 100644
--- a/volumes.c
+++ b/volumes.c
@@ -399,6 +399,34 @@ int btrfs_scan_one_device(int fd, const char *path,
return ret;
}

+/* zone size is ensured to be power of 2 */
+static u64 btrfs_zone_align(struct btrfs_zone_info *zinfo, u64 val)
+{
+ if (zinfo && zinfo->zone_size)
+ return (val + zinfo->zone_size - 1) & ~(zinfo->zone_size - 1);
+ return val;
+}
+
+static bool check_dev_zone(struct btrfs_zone_info *zinfo, u64 physical,
+ u64 num_bytes)
+{
+ u64 zone_size = zinfo->zone_size;
+ int zone_is_random;
+
+ WARN_ON(!IS_ALIGNED(num_bytes, zone_size));
+ zone_is_random = zone_is_random_write(zinfo, physical);
+
+ while (num_bytes) {
+ if (zone_is_random != zone_is_random_write(zinfo, physical))
+ return false;
+
+ physical += zone_size;
+ num_bytes -= zone_size;
+ }
+
+ return true;
+}
+
/*
* find_free_dev_extent_start - find free space in the specified device
* @device: the device which we search the free space in
@@ -428,6 +456,7 @@ static int find_free_dev_extent_start(struct btrfs_device *device,
struct btrfs_root *root = device->dev_root;
struct btrfs_dev_extent *dev_extent;
struct btrfs_path *path;
+ struct btrfs_zone_info *zinfo = &device->zinfo;
u64 hole_size;
u64 max_hole_start;
u64 max_hole_size;
@@ -445,6 +474,7 @@ static int find_free_dev_extent_start(struct btrfs_device *device,
*/
min_search_start = max(root->fs_info->alloc_start, (u64)SZ_1M);
search_start = max(search_start, min_search_start);
+ search_start = btrfs_zone_align(zinfo, search_start);

path = btrfs_alloc_path();
if (!path)
@@ -497,6 +527,18 @@ static int find_free_dev_extent_start(struct btrfs_device *device,
goto next;

if (key.offset > search_start) {
+ if (zinfo && zinfo->zone_size) {
+ while (key.offset > search_start) {
+ hole_size = key.offset - search_start;
+ if (hole_size < num_bytes)
+ break;
+ if (check_dev_zone(zinfo, search_start,
+ num_bytes))
+ break;
+ search_start += zinfo->zone_size;
+ }
+ }
+
hole_size = key.offset - search_start;

/*
@@ -527,7 +569,8 @@ static int find_free_dev_extent_start(struct btrfs_device *device,
extent_end = key.offset + btrfs_dev_extent_length(l,
dev_extent);
if (extent_end > search_start)
- search_start = extent_end;
+ search_start = btrfs_zone_align(&device->zinfo,
+ extent_end);
next:
path->slots[0]++;
cond_resched();
@@ -539,6 +582,18 @@ next:
* search_end may be smaller than search_start.
*/
if (search_end > search_start) {
+ if (zinfo && zinfo->zone_size) {
+ while (search_end > search_start) {
+ hole_size = search_end - search_start;
+ if (hole_size < num_bytes)
+ break;
+ if (check_dev_zone(zinfo, search_start,
+ num_bytes))
+ break;
+ search_start += zinfo->zone_size;
+ }
+ }
+
hole_size = search_end - search_start;

if (hole_size > max_hole_size) {
@@ -582,6 +637,9 @@ int btrfs_insert_dev_extent(struct btrfs_trans_handle *trans,
struct extent_buffer *leaf;
struct btrfs_key key;

+ /* Align to zone for a zoned block device */
+ start = btrfs_zone_align(&device->zinfo, start);
+
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
@@ -1065,9 +1123,15 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
btrfs_super_stripesize(info->super_copy));
}

- /* we don't want a chunk larger than 10% of the FS */
- percent_max = div_factor(btrfs_super_total_bytes(info->super_copy), 1);
- max_chunk_size = min(percent_max, max_chunk_size);
+ if (info->fs_devices->hmzoned) {
+ /* Zoned mode uses zone aligned chunks */
+ calc_size = info->fs_devices->zone_size;
+ max_chunk_size = calc_size * num_stripes;
+ } else {
+ /* we don't want a chunk larger than 10% of the FS */
+ percent_max = div_factor(btrfs_super_total_bytes(info->super_copy), 1);
+ max_chunk_size = min(percent_max, max_chunk_size);
+ }

again:
if (chunk_bytes_by_type(type, calc_size, num_stripes, sub_stripes) >
@@ -1147,7 +1211,9 @@ again:
*num_bytes = chunk_bytes_by_type(type, calc_size,
num_stripes, sub_stripes);
index = 0;
+ dev_offset = 0;
while(index < num_stripes) {
+ size_t zone_size = device->zinfo.zone_size;
struct btrfs_stripe *stripe;
BUG_ON(list_empty(&private_devs));
cur = private_devs.next;
@@ -1158,11 +1224,16 @@ again:
(index == num_stripes - 1))
list_move_tail(&device->dev_list, dev_list);

+ if (device->zinfo.zone_size)
+ calc_size = device->zinfo.zone_size;
+
ret = btrfs_alloc_dev_extent(trans, device, key.offset,
calc_size, &dev_offset);
if (ret < 0)
goto out_chunk_map;

+ WARN_ON(zone_size && !IS_ALIGNED(dev_offset, zone_size));
+
device->bytes_used += calc_size;
ret = btrfs_update_device(trans, device);
if (ret < 0)
--
2.21.0
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