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-rw-r--r--fs/btrfs/zoned.c2533
1 files changed, 2533 insertions, 0 deletions
diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
new file mode 100644
index 0000000000..41a8cdce5d
--- /dev/null
+++ b/fs/btrfs/zoned.c
@@ -0,0 +1,2533 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/bitops.h>
+#include <linux/slab.h>
+#include <linux/blkdev.h>
+#include <linux/sched/mm.h>
+#include <linux/atomic.h>
+#include <linux/vmalloc.h>
+#include "ctree.h"
+#include "volumes.h"
+#include "zoned.h"
+#include "rcu-string.h"
+#include "disk-io.h"
+#include "block-group.h"
+#include "transaction.h"
+#include "dev-replace.h"
+#include "space-info.h"
+#include "super.h"
+#include "fs.h"
+#include "accessors.h"
+#include "bio.h"
+
+/* Maximum number of zones to report per blkdev_report_zones() call */
+#define BTRFS_REPORT_NR_ZONES 4096
+/* Invalid allocation pointer value for missing devices */
+#define WP_MISSING_DEV ((u64)-1)
+/* Pseudo write pointer value for conventional zone */
+#define WP_CONVENTIONAL ((u64)-2)
+
+/*
+ * Location of the first zone of superblock logging zone pairs.
+ *
+ * - primary superblock: 0B (zone 0)
+ * - first copy: 512G (zone starting at that offset)
+ * - second copy: 4T (zone starting at that offset)
+ */
+#define BTRFS_SB_LOG_PRIMARY_OFFSET (0ULL)
+#define BTRFS_SB_LOG_FIRST_OFFSET (512ULL * SZ_1G)
+#define BTRFS_SB_LOG_SECOND_OFFSET (4096ULL * SZ_1G)
+
+#define BTRFS_SB_LOG_FIRST_SHIFT const_ilog2(BTRFS_SB_LOG_FIRST_OFFSET)
+#define BTRFS_SB_LOG_SECOND_SHIFT const_ilog2(BTRFS_SB_LOG_SECOND_OFFSET)
+
+/* Number of superblock log zones */
+#define BTRFS_NR_SB_LOG_ZONES 2
+
+/*
+ * Minimum of active zones we need:
+ *
+ * - BTRFS_SUPER_MIRROR_MAX zones for superblock mirrors
+ * - 3 zones to ensure at least one zone per SYSTEM, META and DATA block group
+ * - 1 zone for tree-log dedicated block group
+ * - 1 zone for relocation
+ */
+#define BTRFS_MIN_ACTIVE_ZONES (BTRFS_SUPER_MIRROR_MAX + 5)
+
+/*
+ * Minimum / maximum supported zone size. Currently, SMR disks have a zone
+ * size of 256MiB, and we are expecting ZNS drives to be in the 1-4GiB range.
+ * We do not expect the zone size to become larger than 8GiB or smaller than
+ * 4MiB in the near future.
+ */
+#define BTRFS_MAX_ZONE_SIZE SZ_8G
+#define BTRFS_MIN_ZONE_SIZE SZ_4M
+
+#define SUPER_INFO_SECTORS ((u64)BTRFS_SUPER_INFO_SIZE >> SECTOR_SHIFT)
+
+static void wait_eb_writebacks(struct btrfs_block_group *block_group);
+static int do_zone_finish(struct btrfs_block_group *block_group, bool fully_written);
+
+static inline bool sb_zone_is_full(const struct blk_zone *zone)
+{
+ return (zone->cond == BLK_ZONE_COND_FULL) ||
+ (zone->wp + SUPER_INFO_SECTORS > zone->start + zone->capacity);
+}
+
+static int copy_zone_info_cb(struct blk_zone *zone, unsigned int idx, void *data)
+{
+ struct blk_zone *zones = data;
+
+ memcpy(&zones[idx], zone, sizeof(*zone));
+
+ return 0;
+}
+
+static int sb_write_pointer(struct block_device *bdev, struct blk_zone *zones,
+ u64 *wp_ret)
+{
+ bool empty[BTRFS_NR_SB_LOG_ZONES];
+ bool full[BTRFS_NR_SB_LOG_ZONES];
+ sector_t sector;
+ int i;
+
+ for (i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++) {
+ ASSERT(zones[i].type != BLK_ZONE_TYPE_CONVENTIONAL);
+ empty[i] = (zones[i].cond == BLK_ZONE_COND_EMPTY);
+ full[i] = sb_zone_is_full(&zones[i]);
+ }
+
+ /*
+ * Possible states of log buffer zones
+ *
+ * Empty[0] In use[0] Full[0]
+ * Empty[1] * 0 1
+ * In use[1] x x 1
+ * Full[1] 0 0 C
+ *
+ * Log position:
+ * *: Special case, no superblock is written
+ * 0: Use write pointer of zones[0]
+ * 1: Use write pointer of zones[1]
+ * C: Compare super blocks from zones[0] and zones[1], use the latest
+ * one determined by generation
+ * x: Invalid state
+ */
+
+ if (empty[0] && empty[1]) {
+ /* Special case to distinguish no superblock to read */
+ *wp_ret = zones[0].start << SECTOR_SHIFT;
+ return -ENOENT;
+ } else if (full[0] && full[1]) {
+ /* Compare two super blocks */
+ struct address_space *mapping = bdev->bd_inode->i_mapping;
+ struct page *page[BTRFS_NR_SB_LOG_ZONES];
+ struct btrfs_super_block *super[BTRFS_NR_SB_LOG_ZONES];
+ int i;
+
+ for (i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++) {
+ u64 zone_end = (zones[i].start + zones[i].capacity) << SECTOR_SHIFT;
+ u64 bytenr = ALIGN_DOWN(zone_end, BTRFS_SUPER_INFO_SIZE) -
+ BTRFS_SUPER_INFO_SIZE;
+
+ page[i] = read_cache_page_gfp(mapping,
+ bytenr >> PAGE_SHIFT, GFP_NOFS);
+ if (IS_ERR(page[i])) {
+ if (i == 1)
+ btrfs_release_disk_super(super[0]);
+ return PTR_ERR(page[i]);
+ }
+ super[i] = page_address(page[i]);
+ }
+
+ if (btrfs_super_generation(super[0]) >
+ btrfs_super_generation(super[1]))
+ sector = zones[1].start;
+ else
+ sector = zones[0].start;
+
+ for (i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++)
+ btrfs_release_disk_super(super[i]);
+ } else if (!full[0] && (empty[1] || full[1])) {
+ sector = zones[0].wp;
+ } else if (full[0]) {
+ sector = zones[1].wp;
+ } else {
+ return -EUCLEAN;
+ }
+ *wp_ret = sector << SECTOR_SHIFT;
+ return 0;
+}
+
+/*
+ * Get the first zone number of the superblock mirror
+ */
+static inline u32 sb_zone_number(int shift, int mirror)
+{
+ u64 zone = U64_MAX;
+
+ ASSERT(mirror < BTRFS_SUPER_MIRROR_MAX);
+ switch (mirror) {
+ case 0: zone = 0; break;
+ case 1: zone = 1ULL << (BTRFS_SB_LOG_FIRST_SHIFT - shift); break;
+ case 2: zone = 1ULL << (BTRFS_SB_LOG_SECOND_SHIFT - shift); break;
+ }
+
+ ASSERT(zone <= U32_MAX);
+
+ return (u32)zone;
+}
+
+static inline sector_t zone_start_sector(u32 zone_number,
+ struct block_device *bdev)
+{
+ return (sector_t)zone_number << ilog2(bdev_zone_sectors(bdev));
+}
+
+static inline u64 zone_start_physical(u32 zone_number,
+ struct btrfs_zoned_device_info *zone_info)
+{
+ return (u64)zone_number << zone_info->zone_size_shift;
+}
+
+/*
+ * Emulate blkdev_report_zones() for a non-zoned device. It slices up the block
+ * device into static sized chunks and fake a conventional zone on each of
+ * them.
+ */
+static int emulate_report_zones(struct btrfs_device *device, u64 pos,
+ struct blk_zone *zones, unsigned int nr_zones)
+{
+ const sector_t zone_sectors = device->fs_info->zone_size >> SECTOR_SHIFT;
+ sector_t bdev_size = bdev_nr_sectors(device->bdev);
+ unsigned int i;
+
+ pos >>= SECTOR_SHIFT;
+ for (i = 0; i < nr_zones; i++) {
+ zones[i].start = i * zone_sectors + pos;
+ zones[i].len = zone_sectors;
+ zones[i].capacity = zone_sectors;
+ zones[i].wp = zones[i].start + zone_sectors;
+ zones[i].type = BLK_ZONE_TYPE_CONVENTIONAL;
+ zones[i].cond = BLK_ZONE_COND_NOT_WP;
+
+ if (zones[i].wp >= bdev_size) {
+ i++;
+ break;
+ }
+ }
+
+ return i;
+}
+
+static int btrfs_get_dev_zones(struct btrfs_device *device, u64 pos,
+ struct blk_zone *zones, unsigned int *nr_zones)
+{
+ struct btrfs_zoned_device_info *zinfo = device->zone_info;
+ int ret;
+
+ if (!*nr_zones)
+ return 0;
+
+ if (!bdev_is_zoned(device->bdev)) {
+ ret = emulate_report_zones(device, pos, zones, *nr_zones);
+ *nr_zones = ret;
+ return 0;
+ }
+
+ /* Check cache */
+ if (zinfo->zone_cache) {
+ unsigned int i;
+ u32 zno;
+
+ ASSERT(IS_ALIGNED(pos, zinfo->zone_size));
+ zno = pos >> zinfo->zone_size_shift;
+ /*
+ * We cannot report zones beyond the zone end. So, it is OK to
+ * cap *nr_zones to at the end.
+ */
+ *nr_zones = min_t(u32, *nr_zones, zinfo->nr_zones - zno);
+
+ for (i = 0; i < *nr_zones; i++) {
+ struct blk_zone *zone_info;
+
+ zone_info = &zinfo->zone_cache[zno + i];
+ if (!zone_info->len)
+ break;
+ }
+
+ if (i == *nr_zones) {
+ /* Cache hit on all the zones */
+ memcpy(zones, zinfo->zone_cache + zno,
+ sizeof(*zinfo->zone_cache) * *nr_zones);
+ return 0;
+ }
+ }
+
+ ret = blkdev_report_zones(device->bdev, pos >> SECTOR_SHIFT, *nr_zones,
+ copy_zone_info_cb, zones);
+ if (ret < 0) {
+ btrfs_err_in_rcu(device->fs_info,
+ "zoned: failed to read zone %llu on %s (devid %llu)",
+ pos, rcu_str_deref(device->name),
+ device->devid);
+ return ret;
+ }
+ *nr_zones = ret;
+ if (!ret)
+ return -EIO;
+
+ /* Populate cache */
+ if (zinfo->zone_cache) {
+ u32 zno = pos >> zinfo->zone_size_shift;
+
+ memcpy(zinfo->zone_cache + zno, zones,
+ sizeof(*zinfo->zone_cache) * *nr_zones);
+ }
+
+ return 0;
+}
+
+/* The emulated zone size is determined from the size of device extent */
+static int calculate_emulated_zone_size(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_path *path;
+ struct btrfs_root *root = fs_info->dev_root;
+ struct btrfs_key key;
+ struct extent_buffer *leaf;
+ struct btrfs_dev_extent *dext;
+ int ret = 0;
+
+ key.objectid = 1;
+ key.type = BTRFS_DEV_EXTENT_KEY;
+ key.offset = 0;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ if (ret < 0)
+ goto out;
+
+ if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
+ ret = btrfs_next_leaf(root, path);
+ if (ret < 0)
+ goto out;
+ /* No dev extents at all? Not good */
+ if (ret > 0) {
+ ret = -EUCLEAN;
+ goto out;
+ }
+ }
+
+ leaf = path->nodes[0];
+ dext = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_extent);
+ fs_info->zone_size = btrfs_dev_extent_length(leaf, dext);
+ ret = 0;
+
+out:
+ btrfs_free_path(path);
+
+ return ret;
+}
+
+int btrfs_get_dev_zone_info_all_devices(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
+ struct btrfs_device *device;
+ int ret = 0;
+
+ /* fs_info->zone_size might not set yet. Use the incomapt flag here. */
+ if (!btrfs_fs_incompat(fs_info, ZONED))
+ return 0;
+
+ mutex_lock(&fs_devices->device_list_mutex);
+ list_for_each_entry(device, &fs_devices->devices, dev_list) {
+ /* We can skip reading of zone info for missing devices */
+ if (!device->bdev)
+ continue;
+
+ ret = btrfs_get_dev_zone_info(device, true);
+ if (ret)
+ break;
+ }
+ mutex_unlock(&fs_devices->device_list_mutex);
+
+ return ret;
+}
+
+int btrfs_get_dev_zone_info(struct btrfs_device *device, bool populate_cache)
+{
+ struct btrfs_fs_info *fs_info = device->fs_info;
+ struct btrfs_zoned_device_info *zone_info = NULL;
+ struct block_device *bdev = device->bdev;
+ unsigned int max_active_zones;
+ unsigned int nactive;
+ sector_t nr_sectors;
+ sector_t sector = 0;
+ struct blk_zone *zones = NULL;
+ unsigned int i, nreported = 0, nr_zones;
+ sector_t zone_sectors;
+ char *model, *emulated;
+ int ret;
+
+ /*
+ * Cannot use btrfs_is_zoned here, since fs_info::zone_size might not
+ * yet be set.
+ */
+ if (!btrfs_fs_incompat(fs_info, ZONED))
+ return 0;
+
+ if (device->zone_info)
+ return 0;
+
+ zone_info = kzalloc(sizeof(*zone_info), GFP_KERNEL);
+ if (!zone_info)
+ return -ENOMEM;
+
+ device->zone_info = zone_info;
+
+ if (!bdev_is_zoned(bdev)) {
+ if (!fs_info->zone_size) {
+ ret = calculate_emulated_zone_size(fs_info);
+ if (ret)
+ goto out;
+ }
+
+ ASSERT(fs_info->zone_size);
+ zone_sectors = fs_info->zone_size >> SECTOR_SHIFT;
+ } else {
+ zone_sectors = bdev_zone_sectors(bdev);
+ }
+
+ ASSERT(is_power_of_two_u64(zone_sectors));
+ zone_info->zone_size = zone_sectors << SECTOR_SHIFT;
+
+ /* We reject devices with a zone size larger than 8GB */
+ if (zone_info->zone_size > BTRFS_MAX_ZONE_SIZE) {
+ btrfs_err_in_rcu(fs_info,
+ "zoned: %s: zone size %llu larger than supported maximum %llu",
+ rcu_str_deref(device->name),
+ zone_info->zone_size, BTRFS_MAX_ZONE_SIZE);
+ ret = -EINVAL;
+ goto out;
+ } else if (zone_info->zone_size < BTRFS_MIN_ZONE_SIZE) {
+ btrfs_err_in_rcu(fs_info,
+ "zoned: %s: zone size %llu smaller than supported minimum %u",
+ rcu_str_deref(device->name),
+ zone_info->zone_size, BTRFS_MIN_ZONE_SIZE);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ nr_sectors = bdev_nr_sectors(bdev);
+ zone_info->zone_size_shift = ilog2(zone_info->zone_size);
+ zone_info->nr_zones = nr_sectors >> ilog2(zone_sectors);
+ if (!IS_ALIGNED(nr_sectors, zone_sectors))
+ zone_info->nr_zones++;
+
+ max_active_zones = bdev_max_active_zones(bdev);
+ if (max_active_zones && max_active_zones < BTRFS_MIN_ACTIVE_ZONES) {
+ btrfs_err_in_rcu(fs_info,
+"zoned: %s: max active zones %u is too small, need at least %u active zones",
+ rcu_str_deref(device->name), max_active_zones,
+ BTRFS_MIN_ACTIVE_ZONES);
+ ret = -EINVAL;
+ goto out;
+ }
+ zone_info->max_active_zones = max_active_zones;
+
+ zone_info->seq_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
+ if (!zone_info->seq_zones) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ zone_info->empty_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
+ if (!zone_info->empty_zones) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ zone_info->active_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
+ if (!zone_info->active_zones) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ zones = kvcalloc(BTRFS_REPORT_NR_ZONES, sizeof(struct blk_zone), GFP_KERNEL);
+ if (!zones) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ /*
+ * Enable zone cache only for a zoned device. On a non-zoned device, we
+ * fill the zone info with emulated CONVENTIONAL zones, so no need to
+ * use the cache.
+ */
+ if (populate_cache && bdev_is_zoned(device->bdev)) {
+ zone_info->zone_cache = vcalloc(zone_info->nr_zones,
+ sizeof(struct blk_zone));
+ if (!zone_info->zone_cache) {
+ btrfs_err_in_rcu(device->fs_info,
+ "zoned: failed to allocate zone cache for %s",
+ rcu_str_deref(device->name));
+ ret = -ENOMEM;
+ goto out;
+ }
+ }
+
+ /* Get zones type */
+ nactive = 0;
+ while (sector < nr_sectors) {
+ nr_zones = BTRFS_REPORT_NR_ZONES;
+ ret = btrfs_get_dev_zones(device, sector << SECTOR_SHIFT, zones,
+ &nr_zones);
+ if (ret)
+ goto out;
+
+ for (i = 0; i < nr_zones; i++) {
+ if (zones[i].type == BLK_ZONE_TYPE_SEQWRITE_REQ)
+ __set_bit(nreported, zone_info->seq_zones);
+ switch (zones[i].cond) {
+ case BLK_ZONE_COND_EMPTY:
+ __set_bit(nreported, zone_info->empty_zones);
+ break;
+ case BLK_ZONE_COND_IMP_OPEN:
+ case BLK_ZONE_COND_EXP_OPEN:
+ case BLK_ZONE_COND_CLOSED:
+ __set_bit(nreported, zone_info->active_zones);
+ nactive++;
+ break;
+ }
+ nreported++;
+ }
+ sector = zones[nr_zones - 1].start + zones[nr_zones - 1].len;
+ }
+
+ if (nreported != zone_info->nr_zones) {
+ btrfs_err_in_rcu(device->fs_info,
+ "inconsistent number of zones on %s (%u/%u)",
+ rcu_str_deref(device->name), nreported,
+ zone_info->nr_zones);
+ ret = -EIO;
+ goto out;
+ }
+
+ if (max_active_zones) {
+ if (nactive > max_active_zones) {
+ btrfs_err_in_rcu(device->fs_info,
+ "zoned: %u active zones on %s exceeds max_active_zones %u",
+ nactive, rcu_str_deref(device->name),
+ max_active_zones);
+ ret = -EIO;
+ goto out;
+ }
+ atomic_set(&zone_info->active_zones_left,
+ max_active_zones - nactive);
+ set_bit(BTRFS_FS_ACTIVE_ZONE_TRACKING, &fs_info->flags);
+ }
+
+ /* Validate superblock log */
+ nr_zones = BTRFS_NR_SB_LOG_ZONES;
+ for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
+ u32 sb_zone;
+ u64 sb_wp;
+ int sb_pos = BTRFS_NR_SB_LOG_ZONES * i;
+
+ sb_zone = sb_zone_number(zone_info->zone_size_shift, i);
+ if (sb_zone + 1 >= zone_info->nr_zones)
+ continue;
+
+ ret = btrfs_get_dev_zones(device,
+ zone_start_physical(sb_zone, zone_info),
+ &zone_info->sb_zones[sb_pos],
+ &nr_zones);
+ if (ret)
+ goto out;
+
+ if (nr_zones != BTRFS_NR_SB_LOG_ZONES) {
+ btrfs_err_in_rcu(device->fs_info,
+ "zoned: failed to read super block log zone info at devid %llu zone %u",
+ device->devid, sb_zone);
+ ret = -EUCLEAN;
+ goto out;
+ }
+
+ /*
+ * If zones[0] is conventional, always use the beginning of the
+ * zone to record superblock. No need to validate in that case.
+ */
+ if (zone_info->sb_zones[BTRFS_NR_SB_LOG_ZONES * i].type ==
+ BLK_ZONE_TYPE_CONVENTIONAL)
+ continue;
+
+ ret = sb_write_pointer(device->bdev,
+ &zone_info->sb_zones[sb_pos], &sb_wp);
+ if (ret != -ENOENT && ret) {
+ btrfs_err_in_rcu(device->fs_info,
+ "zoned: super block log zone corrupted devid %llu zone %u",
+ device->devid, sb_zone);
+ ret = -EUCLEAN;
+ goto out;
+ }
+ }
+
+
+ kvfree(zones);
+
+ switch (bdev_zoned_model(bdev)) {
+ case BLK_ZONED_HM:
+ model = "host-managed zoned";
+ emulated = "";
+ break;
+ case BLK_ZONED_HA:
+ model = "host-aware zoned";
+ emulated = "";
+ break;
+ case BLK_ZONED_NONE:
+ model = "regular";
+ emulated = "emulated ";
+ break;
+ default:
+ /* Just in case */
+ btrfs_err_in_rcu(fs_info, "zoned: unsupported model %d on %s",
+ bdev_zoned_model(bdev),
+ rcu_str_deref(device->name));
+ ret = -EOPNOTSUPP;
+ goto out_free_zone_info;
+ }
+
+ btrfs_info_in_rcu(fs_info,
+ "%s block device %s, %u %szones of %llu bytes",
+ model, rcu_str_deref(device->name), zone_info->nr_zones,
+ emulated, zone_info->zone_size);
+
+ return 0;
+
+out:
+ kvfree(zones);
+out_free_zone_info:
+ btrfs_destroy_dev_zone_info(device);
+
+ return ret;
+}
+
+void btrfs_destroy_dev_zone_info(struct btrfs_device *device)
+{
+ struct btrfs_zoned_device_info *zone_info = device->zone_info;
+
+ if (!zone_info)
+ return;
+
+ bitmap_free(zone_info->active_zones);
+ bitmap_free(zone_info->seq_zones);
+ bitmap_free(zone_info->empty_zones);
+ vfree(zone_info->zone_cache);
+ kfree(zone_info);
+ device->zone_info = NULL;
+}
+
+struct btrfs_zoned_device_info *btrfs_clone_dev_zone_info(struct btrfs_device *orig_dev)
+{
+ struct btrfs_zoned_device_info *zone_info;
+
+ zone_info = kmemdup(orig_dev->zone_info, sizeof(*zone_info), GFP_KERNEL);
+ if (!zone_info)
+ return NULL;
+
+ zone_info->seq_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
+ if (!zone_info->seq_zones)
+ goto out;
+
+ bitmap_copy(zone_info->seq_zones, orig_dev->zone_info->seq_zones,
+ zone_info->nr_zones);
+
+ zone_info->empty_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
+ if (!zone_info->empty_zones)
+ goto out;
+
+ bitmap_copy(zone_info->empty_zones, orig_dev->zone_info->empty_zones,
+ zone_info->nr_zones);
+
+ zone_info->active_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
+ if (!zone_info->active_zones)
+ goto out;
+
+ bitmap_copy(zone_info->active_zones, orig_dev->zone_info->active_zones,
+ zone_info->nr_zones);
+ zone_info->zone_cache = NULL;
+
+ return zone_info;
+
+out:
+ bitmap_free(zone_info->seq_zones);
+ bitmap_free(zone_info->empty_zones);
+ bitmap_free(zone_info->active_zones);
+ kfree(zone_info);
+ return NULL;
+}
+
+int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos,
+ struct blk_zone *zone)
+{
+ unsigned int nr_zones = 1;
+ int ret;
+
+ ret = btrfs_get_dev_zones(device, pos, zone, &nr_zones);
+ if (ret != 0 || !nr_zones)
+ return ret ? ret : -EIO;
+
+ return 0;
+}
+
+static int btrfs_check_for_zoned_device(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_device *device;
+
+ list_for_each_entry(device, &fs_info->fs_devices->devices, dev_list) {
+ if (device->bdev &&
+ bdev_zoned_model(device->bdev) == BLK_ZONED_HM) {
+ btrfs_err(fs_info,
+ "zoned: mode not enabled but zoned device found: %pg",
+ device->bdev);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+int btrfs_check_zoned_mode(struct btrfs_fs_info *fs_info)
+{
+ struct queue_limits *lim = &fs_info->limits;
+ struct btrfs_device *device;
+ u64 zone_size = 0;
+ int ret;
+
+ /*
+ * Host-Managed devices can't be used without the ZONED flag. With the
+ * ZONED all devices can be used, using zone emulation if required.
+ */
+ if (!btrfs_fs_incompat(fs_info, ZONED))
+ return btrfs_check_for_zoned_device(fs_info);
+
+ blk_set_stacking_limits(lim);
+
+ list_for_each_entry(device, &fs_info->fs_devices->devices, dev_list) {
+ struct btrfs_zoned_device_info *zone_info = device->zone_info;
+
+ if (!device->bdev)
+ continue;
+
+ if (!zone_size) {
+ zone_size = zone_info->zone_size;
+ } else if (zone_info->zone_size != zone_size) {
+ btrfs_err(fs_info,
+ "zoned: unequal block device zone sizes: have %llu found %llu",
+ zone_info->zone_size, zone_size);
+ return -EINVAL;
+ }
+
+ /*
+ * With the zoned emulation, we can have non-zoned device on the
+ * zoned mode. In this case, we don't have a valid max zone
+ * append size.
+ */
+ if (bdev_is_zoned(device->bdev)) {
+ blk_stack_limits(lim,
+ &bdev_get_queue(device->bdev)->limits,
+ 0);
+ }
+ }
+
+ /*
+ * stripe_size is always aligned to BTRFS_STRIPE_LEN in
+ * btrfs_create_chunk(). Since we want stripe_len == zone_size,
+ * check the alignment here.
+ */
+ if (!IS_ALIGNED(zone_size, BTRFS_STRIPE_LEN)) {
+ btrfs_err(fs_info,
+ "zoned: zone size %llu not aligned to stripe %u",
+ zone_size, BTRFS_STRIPE_LEN);
+ return -EINVAL;
+ }
+
+ if (btrfs_fs_incompat(fs_info, MIXED_GROUPS)) {
+ btrfs_err(fs_info, "zoned: mixed block groups not supported");
+ return -EINVAL;
+ }
+
+ fs_info->zone_size = zone_size;
+ /*
+ * Also limit max_zone_append_size by max_segments * PAGE_SIZE.
+ * Technically, we can have multiple pages per segment. But, since
+ * we add the pages one by one to a bio, and cannot increase the
+ * metadata reservation even if it increases the number of extents, it
+ * is safe to stick with the limit.
+ */
+ fs_info->max_zone_append_size = ALIGN_DOWN(
+ min3((u64)lim->max_zone_append_sectors << SECTOR_SHIFT,
+ (u64)lim->max_sectors << SECTOR_SHIFT,
+ (u64)lim->max_segments << PAGE_SHIFT),
+ fs_info->sectorsize);
+ fs_info->fs_devices->chunk_alloc_policy = BTRFS_CHUNK_ALLOC_ZONED;
+ if (fs_info->max_zone_append_size < fs_info->max_extent_size)
+ fs_info->max_extent_size = fs_info->max_zone_append_size;
+
+ /*
+ * Check mount options here, because we might change fs_info->zoned
+ * from fs_info->zone_size.
+ */
+ ret = btrfs_check_mountopts_zoned(fs_info);
+ if (ret)
+ return ret;
+
+ btrfs_info(fs_info, "zoned mode enabled with zone size %llu", zone_size);
+ return 0;
+}
+
+int btrfs_check_mountopts_zoned(struct btrfs_fs_info *info)
+{
+ if (!btrfs_is_zoned(info))
+ return 0;
+
+ /*
+ * Space cache writing is not COWed. Disable that to avoid write errors
+ * in sequential zones.
+ */
+ if (btrfs_test_opt(info, SPACE_CACHE)) {
+ btrfs_err(info, "zoned: space cache v1 is not supported");
+ return -EINVAL;
+ }
+
+ if (btrfs_test_opt(info, NODATACOW)) {
+ btrfs_err(info, "zoned: NODATACOW not supported");
+ return -EINVAL;
+ }
+
+ btrfs_clear_and_info(info, DISCARD_ASYNC,
+ "zoned: async discard ignored and disabled for zoned mode");
+
+ return 0;
+}
+
+static int sb_log_location(struct block_device *bdev, struct blk_zone *zones,
+ int rw, u64 *bytenr_ret)
+{
+ u64 wp;
+ int ret;
+
+ if (zones[0].type == BLK_ZONE_TYPE_CONVENTIONAL) {
+ *bytenr_ret = zones[0].start << SECTOR_SHIFT;
+ return 0;
+ }
+
+ ret = sb_write_pointer(bdev, zones, &wp);
+ if (ret != -ENOENT && ret < 0)
+ return ret;
+
+ if (rw == WRITE) {
+ struct blk_zone *reset = NULL;
+
+ if (wp == zones[0].start << SECTOR_SHIFT)
+ reset = &zones[0];
+ else if (wp == zones[1].start << SECTOR_SHIFT)
+ reset = &zones[1];
+
+ if (reset && reset->cond != BLK_ZONE_COND_EMPTY) {
+ ASSERT(sb_zone_is_full(reset));
+
+ ret = blkdev_zone_mgmt(bdev, REQ_OP_ZONE_RESET,
+ reset->start, reset->len,
+ GFP_NOFS);
+ if (ret)
+ return ret;
+
+ reset->cond = BLK_ZONE_COND_EMPTY;
+ reset->wp = reset->start;
+ }
+ } else if (ret != -ENOENT) {
+ /*
+ * For READ, we want the previous one. Move write pointer to
+ * the end of a zone, if it is at the head of a zone.
+ */
+ u64 zone_end = 0;
+
+ if (wp == zones[0].start << SECTOR_SHIFT)
+ zone_end = zones[1].start + zones[1].capacity;
+ else if (wp == zones[1].start << SECTOR_SHIFT)
+ zone_end = zones[0].start + zones[0].capacity;
+ if (zone_end)
+ wp = ALIGN_DOWN(zone_end << SECTOR_SHIFT,
+ BTRFS_SUPER_INFO_SIZE);
+
+ wp -= BTRFS_SUPER_INFO_SIZE;
+ }
+
+ *bytenr_ret = wp;
+ return 0;
+
+}
+
+int btrfs_sb_log_location_bdev(struct block_device *bdev, int mirror, int rw,
+ u64 *bytenr_ret)
+{
+ struct blk_zone zones[BTRFS_NR_SB_LOG_ZONES];
+ sector_t zone_sectors;
+ u32 sb_zone;
+ int ret;
+ u8 zone_sectors_shift;
+ sector_t nr_sectors;
+ u32 nr_zones;
+
+ if (!bdev_is_zoned(bdev)) {
+ *bytenr_ret = btrfs_sb_offset(mirror);
+ return 0;
+ }
+
+ ASSERT(rw == READ || rw == WRITE);
+
+ zone_sectors = bdev_zone_sectors(bdev);
+ if (!is_power_of_2(zone_sectors))
+ return -EINVAL;
+ zone_sectors_shift = ilog2(zone_sectors);
+ nr_sectors = bdev_nr_sectors(bdev);
+ nr_zones = nr_sectors >> zone_sectors_shift;
+
+ sb_zone = sb_zone_number(zone_sectors_shift + SECTOR_SHIFT, mirror);
+ if (sb_zone + 1 >= nr_zones)
+ return -ENOENT;
+
+ ret = blkdev_report_zones(bdev, zone_start_sector(sb_zone, bdev),
+ BTRFS_NR_SB_LOG_ZONES, copy_zone_info_cb,
+ zones);
+ if (ret < 0)
+ return ret;
+ if (ret != BTRFS_NR_SB_LOG_ZONES)
+ return -EIO;
+
+ return sb_log_location(bdev, zones, rw, bytenr_ret);
+}
+
+int btrfs_sb_log_location(struct btrfs_device *device, int mirror, int rw,
+ u64 *bytenr_ret)
+{
+ struct btrfs_zoned_device_info *zinfo = device->zone_info;
+ u32 zone_num;
+
+ /*
+ * For a zoned filesystem on a non-zoned block device, use the same
+ * super block locations as regular filesystem. Doing so, the super
+ * block can always be retrieved and the zoned flag of the volume
+ * detected from the super block information.
+ */
+ if (!bdev_is_zoned(device->bdev)) {
+ *bytenr_ret = btrfs_sb_offset(mirror);
+ return 0;
+ }
+
+ zone_num = sb_zone_number(zinfo->zone_size_shift, mirror);
+ if (zone_num + 1 >= zinfo->nr_zones)
+ return -ENOENT;
+
+ return sb_log_location(device->bdev,
+ &zinfo->sb_zones[BTRFS_NR_SB_LOG_ZONES * mirror],
+ rw, bytenr_ret);
+}
+
+static inline bool is_sb_log_zone(struct btrfs_zoned_device_info *zinfo,
+ int mirror)
+{
+ u32 zone_num;
+
+ if (!zinfo)
+ return false;
+
+ zone_num = sb_zone_number(zinfo->zone_size_shift, mirror);
+ if (zone_num + 1 >= zinfo->nr_zones)
+ return false;
+
+ if (!test_bit(zone_num, zinfo->seq_zones))
+ return false;
+
+ return true;
+}
+
+int btrfs_advance_sb_log(struct btrfs_device *device, int mirror)
+{
+ struct btrfs_zoned_device_info *zinfo = device->zone_info;
+ struct blk_zone *zone;
+ int i;
+
+ if (!is_sb_log_zone(zinfo, mirror))
+ return 0;
+
+ zone = &zinfo->sb_zones[BTRFS_NR_SB_LOG_ZONES * mirror];
+ for (i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++) {
+ /* Advance the next zone */
+ if (zone->cond == BLK_ZONE_COND_FULL) {
+ zone++;
+ continue;
+ }
+
+ if (zone->cond == BLK_ZONE_COND_EMPTY)
+ zone->cond = BLK_ZONE_COND_IMP_OPEN;
+
+ zone->wp += SUPER_INFO_SECTORS;
+
+ if (sb_zone_is_full(zone)) {
+ /*
+ * No room left to write new superblock. Since
+ * superblock is written with REQ_SYNC, it is safe to
+ * finish the zone now.
+ *
+ * If the write pointer is exactly at the capacity,
+ * explicit ZONE_FINISH is not necessary.
+ */
+ if (zone->wp != zone->start + zone->capacity) {
+ int ret;
+
+ ret = blkdev_zone_mgmt(device->bdev,
+ REQ_OP_ZONE_FINISH, zone->start,
+ zone->len, GFP_NOFS);
+ if (ret)
+ return ret;
+ }
+
+ zone->wp = zone->start + zone->len;
+ zone->cond = BLK_ZONE_COND_FULL;
+ }
+ return 0;
+ }
+
+ /* All the zones are FULL. Should not reach here. */
+ ASSERT(0);
+ return -EIO;
+}
+
+int btrfs_reset_sb_log_zones(struct block_device *bdev, int mirror)
+{
+ sector_t zone_sectors;
+ sector_t nr_sectors;
+ u8 zone_sectors_shift;
+ u32 sb_zone;
+ u32 nr_zones;
+
+ zone_sectors = bdev_zone_sectors(bdev);
+ zone_sectors_shift = ilog2(zone_sectors);
+ nr_sectors = bdev_nr_sectors(bdev);
+ nr_zones = nr_sectors >> zone_sectors_shift;
+
+ sb_zone = sb_zone_number(zone_sectors_shift + SECTOR_SHIFT, mirror);
+ if (sb_zone + 1 >= nr_zones)
+ return -ENOENT;
+
+ return blkdev_zone_mgmt(bdev, REQ_OP_ZONE_RESET,
+ zone_start_sector(sb_zone, bdev),
+ zone_sectors * BTRFS_NR_SB_LOG_ZONES, GFP_NOFS);
+}
+
+/*
+ * Find allocatable zones within a given region.
+ *
+ * @device: the device to allocate a region on
+ * @hole_start: the position of the hole to allocate the region
+ * @num_bytes: size of wanted region
+ * @hole_end: the end of the hole
+ * @return: position of allocatable zones
+ *
+ * Allocatable region should not contain any superblock locations.
+ */
+u64 btrfs_find_allocatable_zones(struct btrfs_device *device, u64 hole_start,
+ u64 hole_end, u64 num_bytes)
+{
+ struct btrfs_zoned_device_info *zinfo = device->zone_info;
+ const u8 shift = zinfo->zone_size_shift;
+ u64 nzones = num_bytes >> shift;
+ u64 pos = hole_start;
+ u64 begin, end;
+ bool have_sb;
+ int i;
+
+ ASSERT(IS_ALIGNED(hole_start, zinfo->zone_size));
+ ASSERT(IS_ALIGNED(num_bytes, zinfo->zone_size));
+
+ while (pos < hole_end) {
+ begin = pos >> shift;
+ end = begin + nzones;
+
+ if (end > zinfo->nr_zones)
+ return hole_end;
+
+ /* Check if zones in the region are all empty */
+ if (btrfs_dev_is_sequential(device, pos) &&
+ !bitmap_test_range_all_set(zinfo->empty_zones, begin, nzones)) {
+ pos += zinfo->zone_size;
+ continue;
+ }
+
+ have_sb = false;
+ for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
+ u32 sb_zone;
+ u64 sb_pos;
+
+ sb_zone = sb_zone_number(shift, i);
+ if (!(end <= sb_zone ||
+ sb_zone + BTRFS_NR_SB_LOG_ZONES <= begin)) {
+ have_sb = true;
+ pos = zone_start_physical(
+ sb_zone + BTRFS_NR_SB_LOG_ZONES, zinfo);
+ break;
+ }
+
+ /* We also need to exclude regular superblock positions */
+ sb_pos = btrfs_sb_offset(i);
+ if (!(pos + num_bytes <= sb_pos ||
+ sb_pos + BTRFS_SUPER_INFO_SIZE <= pos)) {
+ have_sb = true;
+ pos = ALIGN(sb_pos + BTRFS_SUPER_INFO_SIZE,
+ zinfo->zone_size);
+ break;
+ }
+ }
+ if (!have_sb)
+ break;
+ }
+
+ return pos;
+}
+
+static bool btrfs_dev_set_active_zone(struct btrfs_device *device, u64 pos)
+{
+ struct btrfs_zoned_device_info *zone_info = device->zone_info;
+ unsigned int zno = (pos >> zone_info->zone_size_shift);
+
+ /* We can use any number of zones */
+ if (zone_info->max_active_zones == 0)
+ return true;
+
+ if (!test_bit(zno, zone_info->active_zones)) {
+ /* Active zone left? */
+ if (atomic_dec_if_positive(&zone_info->active_zones_left) < 0)
+ return false;
+ if (test_and_set_bit(zno, zone_info->active_zones)) {
+ /* Someone already set the bit */
+ atomic_inc(&zone_info->active_zones_left);
+ }
+ }
+
+ return true;
+}
+
+static void btrfs_dev_clear_active_zone(struct btrfs_device *device, u64 pos)
+{
+ struct btrfs_zoned_device_info *zone_info = device->zone_info;
+ unsigned int zno = (pos >> zone_info->zone_size_shift);
+
+ /* We can use any number of zones */
+ if (zone_info->max_active_zones == 0)
+ return;
+
+ if (test_and_clear_bit(zno, zone_info->active_zones))
+ atomic_inc(&zone_info->active_zones_left);
+}
+
+int btrfs_reset_device_zone(struct btrfs_device *device, u64 physical,
+ u64 length, u64 *bytes)
+{
+ int ret;
+
+ *bytes = 0;
+ ret = blkdev_zone_mgmt(device->bdev, REQ_OP_ZONE_RESET,
+ physical >> SECTOR_SHIFT, length >> SECTOR_SHIFT,
+ GFP_NOFS);
+ if (ret)
+ return ret;
+
+ *bytes = length;
+ while (length) {
+ btrfs_dev_set_zone_empty(device, physical);
+ btrfs_dev_clear_active_zone(device, physical);
+ physical += device->zone_info->zone_size;
+ length -= device->zone_info->zone_size;
+ }
+
+ return 0;
+}
+
+int btrfs_ensure_empty_zones(struct btrfs_device *device, u64 start, u64 size)
+{
+ struct btrfs_zoned_device_info *zinfo = device->zone_info;
+ const u8 shift = zinfo->zone_size_shift;
+ unsigned long begin = start >> shift;
+ unsigned long nbits = size >> shift;
+ u64 pos;
+ int ret;
+
+ ASSERT(IS_ALIGNED(start, zinfo->zone_size));
+ ASSERT(IS_ALIGNED(size, zinfo->zone_size));
+
+ if (begin + nbits > zinfo->nr_zones)
+ return -ERANGE;
+
+ /* All the zones are conventional */
+ if (bitmap_test_range_all_zero(zinfo->seq_zones, begin, nbits))
+ return 0;
+
+ /* All the zones are sequential and empty */
+ if (bitmap_test_range_all_set(zinfo->seq_zones, begin, nbits) &&
+ bitmap_test_range_all_set(zinfo->empty_zones, begin, nbits))
+ return 0;
+
+ for (pos = start; pos < start + size; pos += zinfo->zone_size) {
+ u64 reset_bytes;
+
+ if (!btrfs_dev_is_sequential(device, pos) ||
+ btrfs_dev_is_empty_zone(device, pos))
+ continue;
+
+ /* Free regions should be empty */
+ btrfs_warn_in_rcu(
+ device->fs_info,
+ "zoned: resetting device %s (devid %llu) zone %llu for allocation",
+ rcu_str_deref(device->name), device->devid, pos >> shift);
+ WARN_ON_ONCE(1);
+
+ ret = btrfs_reset_device_zone(device, pos, zinfo->zone_size,
+ &reset_bytes);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
+ * Calculate an allocation pointer from the extent allocation information
+ * for a block group consist of conventional zones. It is pointed to the
+ * end of the highest addressed extent in the block group as an allocation
+ * offset.
+ */
+static int calculate_alloc_pointer(struct btrfs_block_group *cache,
+ u64 *offset_ret, bool new)
+{
+ struct btrfs_fs_info *fs_info = cache->fs_info;
+ struct btrfs_root *root;
+ struct btrfs_path *path;
+ struct btrfs_key key;
+ struct btrfs_key found_key;
+ int ret;
+ u64 length;
+
+ /*
+ * Avoid tree lookups for a new block group, there's no use for it.
+ * It must always be 0.
+ *
+ * Also, we have a lock chain of extent buffer lock -> chunk mutex.
+ * For new a block group, this function is called from
+ * btrfs_make_block_group() which is already taking the chunk mutex.
+ * Thus, we cannot call calculate_alloc_pointer() which takes extent
+ * buffer locks to avoid deadlock.
+ */
+ if (new) {
+ *offset_ret = 0;
+ return 0;
+ }
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ key.objectid = cache->start + cache->length;
+ key.type = 0;
+ key.offset = 0;
+
+ root = btrfs_extent_root(fs_info, key.objectid);
+ ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ /* We should not find the exact match */
+ if (!ret)
+ ret = -EUCLEAN;
+ if (ret < 0)
+ goto out;
+
+ ret = btrfs_previous_extent_item(root, path, cache->start);
+ if (ret) {
+ if (ret == 1) {
+ ret = 0;
+ *offset_ret = 0;
+ }
+ goto out;
+ }
+
+ btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]);
+
+ if (found_key.type == BTRFS_EXTENT_ITEM_KEY)
+ length = found_key.offset;
+ else
+ length = fs_info->nodesize;
+
+ if (!(found_key.objectid >= cache->start &&
+ found_key.objectid + length <= cache->start + cache->length)) {
+ ret = -EUCLEAN;
+ goto out;
+ }
+ *offset_ret = found_key.objectid + length - cache->start;
+ ret = 0;
+
+out:
+ btrfs_free_path(path);
+ return ret;
+}
+
+int btrfs_load_block_group_zone_info(struct btrfs_block_group *cache, bool new)
+{
+ struct btrfs_fs_info *fs_info = cache->fs_info;
+ struct extent_map_tree *em_tree = &fs_info->mapping_tree;
+ struct extent_map *em;
+ struct map_lookup *map;
+ struct btrfs_device *device;
+ u64 logical = cache->start;
+ u64 length = cache->length;
+ int ret;
+ int i;
+ unsigned int nofs_flag;
+ u64 *alloc_offsets = NULL;
+ u64 *caps = NULL;
+ u64 *physical = NULL;
+ unsigned long *active = NULL;
+ u64 last_alloc = 0;
+ u32 num_sequential = 0, num_conventional = 0;
+
+ if (!btrfs_is_zoned(fs_info))
+ return 0;
+
+ /* Sanity check */
+ if (!IS_ALIGNED(length, fs_info->zone_size)) {
+ btrfs_err(fs_info,
+ "zoned: block group %llu len %llu unaligned to zone size %llu",
+ logical, length, fs_info->zone_size);
+ return -EIO;
+ }
+
+ /* Get the chunk mapping */
+ read_lock(&em_tree->lock);
+ em = lookup_extent_mapping(em_tree, logical, length);
+ read_unlock(&em_tree->lock);
+
+ if (!em)
+ return -EINVAL;
+
+ map = em->map_lookup;
+
+ cache->physical_map = kmemdup(map, map_lookup_size(map->num_stripes), GFP_NOFS);
+ if (!cache->physical_map) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ alloc_offsets = kcalloc(map->num_stripes, sizeof(*alloc_offsets), GFP_NOFS);
+ if (!alloc_offsets) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ caps = kcalloc(map->num_stripes, sizeof(*caps), GFP_NOFS);
+ if (!caps) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ physical = kcalloc(map->num_stripes, sizeof(*physical), GFP_NOFS);
+ if (!physical) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ active = bitmap_zalloc(map->num_stripes, GFP_NOFS);
+ if (!active) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ for (i = 0; i < map->num_stripes; i++) {
+ bool is_sequential;
+ struct blk_zone zone;
+ struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
+ int dev_replace_is_ongoing = 0;
+
+ device = map->stripes[i].dev;
+ physical[i] = map->stripes[i].physical;
+
+ if (device->bdev == NULL) {
+ alloc_offsets[i] = WP_MISSING_DEV;
+ continue;
+ }
+
+ is_sequential = btrfs_dev_is_sequential(device, physical[i]);
+ if (is_sequential)
+ num_sequential++;
+ else
+ num_conventional++;
+
+ /*
+ * Consider a zone as active if we can allow any number of
+ * active zones.
+ */
+ if (!device->zone_info->max_active_zones)
+ __set_bit(i, active);
+
+ if (!is_sequential) {
+ alloc_offsets[i] = WP_CONVENTIONAL;
+ continue;
+ }
+
+ /*
+ * This zone will be used for allocation, so mark this zone
+ * non-empty.
+ */
+ btrfs_dev_clear_zone_empty(device, physical[i]);
+
+ down_read(&dev_replace->rwsem);
+ dev_replace_is_ongoing = btrfs_dev_replace_is_ongoing(dev_replace);
+ if (dev_replace_is_ongoing && dev_replace->tgtdev != NULL)
+ btrfs_dev_clear_zone_empty(dev_replace->tgtdev, physical[i]);
+ up_read(&dev_replace->rwsem);
+
+ /*
+ * The group is mapped to a sequential zone. Get the zone write
+ * pointer to determine the allocation offset within the zone.
+ */
+ WARN_ON(!IS_ALIGNED(physical[i], fs_info->zone_size));
+ nofs_flag = memalloc_nofs_save();
+ ret = btrfs_get_dev_zone(device, physical[i], &zone);
+ memalloc_nofs_restore(nofs_flag);
+ if (ret == -EIO || ret == -EOPNOTSUPP) {
+ ret = 0;
+ alloc_offsets[i] = WP_MISSING_DEV;
+ continue;
+ } else if (ret) {
+ goto out;
+ }
+
+ if (zone.type == BLK_ZONE_TYPE_CONVENTIONAL) {
+ btrfs_err_in_rcu(fs_info,
+ "zoned: unexpected conventional zone %llu on device %s (devid %llu)",
+ zone.start << SECTOR_SHIFT,
+ rcu_str_deref(device->name), device->devid);
+ ret = -EIO;
+ goto out;
+ }
+
+ caps[i] = (zone.capacity << SECTOR_SHIFT);
+
+ switch (zone.cond) {
+ case BLK_ZONE_COND_OFFLINE:
+ case BLK_ZONE_COND_READONLY:
+ btrfs_err(fs_info,
+ "zoned: offline/readonly zone %llu on device %s (devid %llu)",
+ physical[i] >> device->zone_info->zone_size_shift,
+ rcu_str_deref(device->name), device->devid);
+ alloc_offsets[i] = WP_MISSING_DEV;
+ break;
+ case BLK_ZONE_COND_EMPTY:
+ alloc_offsets[i] = 0;
+ break;
+ case BLK_ZONE_COND_FULL:
+ alloc_offsets[i] = caps[i];
+ break;
+ default:
+ /* Partially used zone */
+ alloc_offsets[i] =
+ ((zone.wp - zone.start) << SECTOR_SHIFT);
+ __set_bit(i, active);
+ break;
+ }
+ }
+
+ if (num_sequential > 0)
+ set_bit(BLOCK_GROUP_FLAG_SEQUENTIAL_ZONE, &cache->runtime_flags);
+
+ if (num_conventional > 0) {
+ /* Zone capacity is always zone size in emulation */
+ cache->zone_capacity = cache->length;
+ ret = calculate_alloc_pointer(cache, &last_alloc, new);
+ if (ret) {
+ btrfs_err(fs_info,
+ "zoned: failed to determine allocation offset of bg %llu",
+ cache->start);
+ goto out;
+ } else if (map->num_stripes == num_conventional) {
+ cache->alloc_offset = last_alloc;
+ set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &cache->runtime_flags);
+ goto out;
+ }
+ }
+
+ switch (map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
+ case 0: /* single */
+ if (alloc_offsets[0] == WP_MISSING_DEV) {
+ btrfs_err(fs_info,
+ "zoned: cannot recover write pointer for zone %llu",
+ physical[0]);
+ ret = -EIO;
+ goto out;
+ }
+ cache->alloc_offset = alloc_offsets[0];
+ cache->zone_capacity = caps[0];
+ if (test_bit(0, active))
+ set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &cache->runtime_flags);
+ break;
+ case BTRFS_BLOCK_GROUP_DUP:
+ if (map->type & BTRFS_BLOCK_GROUP_DATA) {
+ btrfs_err(fs_info, "zoned: profile DUP not yet supported on data bg");
+ ret = -EINVAL;
+ goto out;
+ }
+ if (alloc_offsets[0] == WP_MISSING_DEV) {
+ btrfs_err(fs_info,
+ "zoned: cannot recover write pointer for zone %llu",
+ physical[0]);
+ ret = -EIO;
+ goto out;
+ }
+ if (alloc_offsets[1] == WP_MISSING_DEV) {
+ btrfs_err(fs_info,
+ "zoned: cannot recover write pointer for zone %llu",
+ physical[1]);
+ ret = -EIO;
+ goto out;
+ }
+ if (alloc_offsets[0] != alloc_offsets[1]) {
+ btrfs_err(fs_info,
+ "zoned: write pointer offset mismatch of zones in DUP profile");
+ ret = -EIO;
+ goto out;
+ }
+ if (test_bit(0, active) != test_bit(1, active)) {
+ if (!btrfs_zone_activate(cache)) {
+ ret = -EIO;
+ goto out;
+ }
+ } else {
+ if (test_bit(0, active))
+ set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE,
+ &cache->runtime_flags);
+ }
+ cache->alloc_offset = alloc_offsets[0];
+ cache->zone_capacity = min(caps[0], caps[1]);
+ break;
+ case BTRFS_BLOCK_GROUP_RAID1:
+ case BTRFS_BLOCK_GROUP_RAID0:
+ case BTRFS_BLOCK_GROUP_RAID10:
+ case BTRFS_BLOCK_GROUP_RAID5:
+ case BTRFS_BLOCK_GROUP_RAID6:
+ /* non-single profiles are not supported yet */
+ default:
+ btrfs_err(fs_info, "zoned: profile %s not yet supported",
+ btrfs_bg_type_to_raid_name(map->type));
+ ret = -EINVAL;
+ goto out;
+ }
+
+out:
+ if (cache->alloc_offset > fs_info->zone_size) {
+ btrfs_err(fs_info,
+ "zoned: invalid write pointer %llu in block group %llu",
+ cache->alloc_offset, cache->start);
+ ret = -EIO;
+ }
+
+ if (cache->alloc_offset > cache->zone_capacity) {
+ btrfs_err(fs_info,
+"zoned: invalid write pointer %llu (larger than zone capacity %llu) in block group %llu",
+ cache->alloc_offset, cache->zone_capacity,
+ cache->start);
+ ret = -EIO;
+ }
+
+ /* An extent is allocated after the write pointer */
+ if (!ret && num_conventional && last_alloc > cache->alloc_offset) {
+ btrfs_err(fs_info,
+ "zoned: got wrong write pointer in BG %llu: %llu > %llu",
+ logical, last_alloc, cache->alloc_offset);
+ ret = -EIO;
+ }
+
+ if (!ret) {
+ cache->meta_write_pointer = cache->alloc_offset + cache->start;
+ if (test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &cache->runtime_flags)) {
+ btrfs_get_block_group(cache);
+ spin_lock(&fs_info->zone_active_bgs_lock);
+ list_add_tail(&cache->active_bg_list,
+ &fs_info->zone_active_bgs);
+ spin_unlock(&fs_info->zone_active_bgs_lock);
+ }
+ } else {
+ kfree(cache->physical_map);
+ cache->physical_map = NULL;
+ }
+ bitmap_free(active);
+ kfree(physical);
+ kfree(caps);
+ kfree(alloc_offsets);
+ free_extent_map(em);
+
+ return ret;
+}
+
+void btrfs_calc_zone_unusable(struct btrfs_block_group *cache)
+{
+ u64 unusable, free;
+
+ if (!btrfs_is_zoned(cache->fs_info))
+ return;
+
+ WARN_ON(cache->bytes_super != 0);
+ unusable = (cache->alloc_offset - cache->used) +
+ (cache->length - cache->zone_capacity);
+ free = cache->zone_capacity - cache->alloc_offset;
+
+ /* We only need ->free_space in ALLOC_SEQ block groups */
+ cache->cached = BTRFS_CACHE_FINISHED;
+ cache->free_space_ctl->free_space = free;
+ cache->zone_unusable = unusable;
+}
+
+void btrfs_redirty_list_add(struct btrfs_transaction *trans,
+ struct extent_buffer *eb)
+{
+ if (!btrfs_is_zoned(eb->fs_info) ||
+ btrfs_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN))
+ return;
+
+ ASSERT(!test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
+
+ memzero_extent_buffer(eb, 0, eb->len);
+ set_bit(EXTENT_BUFFER_NO_CHECK, &eb->bflags);
+ set_extent_buffer_dirty(eb);
+ set_extent_bit(&trans->dirty_pages, eb->start, eb->start + eb->len - 1,
+ EXTENT_DIRTY | EXTENT_NOWAIT, NULL);
+}
+
+bool btrfs_use_zone_append(struct btrfs_bio *bbio)
+{
+ u64 start = (bbio->bio.bi_iter.bi_sector << SECTOR_SHIFT);
+ struct btrfs_inode *inode = bbio->inode;
+ struct btrfs_fs_info *fs_info = bbio->fs_info;
+ struct btrfs_block_group *cache;
+ bool ret = false;
+
+ if (!btrfs_is_zoned(fs_info))
+ return false;
+
+ if (!inode || !is_data_inode(&inode->vfs_inode))
+ return false;
+
+ if (btrfs_op(&bbio->bio) != BTRFS_MAP_WRITE)
+ return false;
+
+ /*
+ * Using REQ_OP_ZONE_APPNED for relocation can break assumptions on the
+ * extent layout the relocation code has.
+ * Furthermore we have set aside own block-group from which only the
+ * relocation "process" can allocate and make sure only one process at a
+ * time can add pages to an extent that gets relocated, so it's safe to
+ * use regular REQ_OP_WRITE for this special case.
+ */
+ if (btrfs_is_data_reloc_root(inode->root))
+ return false;
+
+ cache = btrfs_lookup_block_group(fs_info, start);
+ ASSERT(cache);
+ if (!cache)
+ return false;
+
+ ret = !!test_bit(BLOCK_GROUP_FLAG_SEQUENTIAL_ZONE, &cache->runtime_flags);
+ btrfs_put_block_group(cache);
+
+ return ret;
+}
+
+void btrfs_record_physical_zoned(struct btrfs_bio *bbio)
+{
+ const u64 physical = bbio->bio.bi_iter.bi_sector << SECTOR_SHIFT;
+ struct btrfs_ordered_sum *sum = bbio->sums;
+
+ if (physical < bbio->orig_physical)
+ sum->logical -= bbio->orig_physical - physical;
+ else
+ sum->logical += physical - bbio->orig_physical;
+}
+
+static void btrfs_rewrite_logical_zoned(struct btrfs_ordered_extent *ordered,
+ u64 logical)
+{
+ struct extent_map_tree *em_tree = &BTRFS_I(ordered->inode)->extent_tree;
+ struct extent_map *em;
+
+ ordered->disk_bytenr = logical;
+
+ write_lock(&em_tree->lock);
+ em = search_extent_mapping(em_tree, ordered->file_offset,
+ ordered->num_bytes);
+ em->block_start = logical;
+ free_extent_map(em);
+ write_unlock(&em_tree->lock);
+}
+
+static bool btrfs_zoned_split_ordered(struct btrfs_ordered_extent *ordered,
+ u64 logical, u64 len)
+{
+ struct btrfs_ordered_extent *new;
+
+ if (!test_bit(BTRFS_ORDERED_NOCOW, &ordered->flags) &&
+ split_extent_map(BTRFS_I(ordered->inode), ordered->file_offset,
+ ordered->num_bytes, len, logical))
+ return false;
+
+ new = btrfs_split_ordered_extent(ordered, len);
+ if (IS_ERR(new))
+ return false;
+ new->disk_bytenr = logical;
+ btrfs_finish_one_ordered(new);
+ return true;
+}
+
+void btrfs_finish_ordered_zoned(struct btrfs_ordered_extent *ordered)
+{
+ struct btrfs_inode *inode = BTRFS_I(ordered->inode);
+ struct btrfs_fs_info *fs_info = inode->root->fs_info;
+ struct btrfs_ordered_sum *sum;
+ u64 logical, len;
+
+ /*
+ * Write to pre-allocated region is for the data relocation, and so
+ * it should use WRITE operation. No split/rewrite are necessary.
+ */
+ if (test_bit(BTRFS_ORDERED_PREALLOC, &ordered->flags))
+ return;
+
+ ASSERT(!list_empty(&ordered->list));
+ /* The ordered->list can be empty in the above pre-alloc case. */
+ sum = list_first_entry(&ordered->list, struct btrfs_ordered_sum, list);
+ logical = sum->logical;
+ len = sum->len;
+
+ while (len < ordered->disk_num_bytes) {
+ sum = list_next_entry(sum, list);
+ if (sum->logical == logical + len) {
+ len += sum->len;
+ continue;
+ }
+ if (!btrfs_zoned_split_ordered(ordered, logical, len)) {
+ set_bit(BTRFS_ORDERED_IOERR, &ordered->flags);
+ btrfs_err(fs_info, "failed to split ordered extent");
+ goto out;
+ }
+ logical = sum->logical;
+ len = sum->len;
+ }
+
+ if (ordered->disk_bytenr != logical)
+ btrfs_rewrite_logical_zoned(ordered, logical);
+
+out:
+ /*
+ * If we end up here for nodatasum I/O, the btrfs_ordered_sum structures
+ * were allocated by btrfs_alloc_dummy_sum only to record the logical
+ * addresses and don't contain actual checksums. We thus must free them
+ * here so that we don't attempt to log the csums later.
+ */
+ if ((inode->flags & BTRFS_INODE_NODATASUM) ||
+ test_bit(BTRFS_FS_STATE_NO_CSUMS, &fs_info->fs_state)) {
+ while ((sum = list_first_entry_or_null(&ordered->list,
+ typeof(*sum), list))) {
+ list_del(&sum->list);
+ kfree(sum);
+ }
+ }
+}
+
+static bool check_bg_is_active(struct btrfs_eb_write_context *ctx,
+ struct btrfs_block_group **active_bg)
+{
+ const struct writeback_control *wbc = ctx->wbc;
+ struct btrfs_block_group *block_group = ctx->zoned_bg;
+ struct btrfs_fs_info *fs_info = block_group->fs_info;
+
+ if (test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &block_group->runtime_flags))
+ return true;
+
+ if (fs_info->treelog_bg == block_group->start) {
+ if (!btrfs_zone_activate(block_group)) {
+ int ret_fin = btrfs_zone_finish_one_bg(fs_info);
+
+ if (ret_fin != 1 || !btrfs_zone_activate(block_group))
+ return false;
+ }
+ } else if (*active_bg != block_group) {
+ struct btrfs_block_group *tgt = *active_bg;
+
+ /* zoned_meta_io_lock protects fs_info->active_{meta,system}_bg. */
+ lockdep_assert_held(&fs_info->zoned_meta_io_lock);
+
+ if (tgt) {
+ /*
+ * If there is an unsent IO left in the allocated area,
+ * we cannot wait for them as it may cause a deadlock.
+ */
+ if (tgt->meta_write_pointer < tgt->start + tgt->alloc_offset) {
+ if (wbc->sync_mode == WB_SYNC_NONE ||
+ (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync))
+ return false;
+ }
+
+ /* Pivot active metadata/system block group. */
+ btrfs_zoned_meta_io_unlock(fs_info);
+ wait_eb_writebacks(tgt);
+ do_zone_finish(tgt, true);
+ btrfs_zoned_meta_io_lock(fs_info);
+ if (*active_bg == tgt) {
+ btrfs_put_block_group(tgt);
+ *active_bg = NULL;
+ }
+ }
+ if (!btrfs_zone_activate(block_group))
+ return false;
+ if (*active_bg != block_group) {
+ ASSERT(*active_bg == NULL);
+ *active_bg = block_group;
+ btrfs_get_block_group(block_group);
+ }
+ }
+
+ return true;
+}
+
+/*
+ * Check if @ctx->eb is aligned to the write pointer.
+ *
+ * Return:
+ * 0: @ctx->eb is at the write pointer. You can write it.
+ * -EAGAIN: There is a hole. The caller should handle the case.
+ * -EBUSY: There is a hole, but the caller can just bail out.
+ */
+int btrfs_check_meta_write_pointer(struct btrfs_fs_info *fs_info,
+ struct btrfs_eb_write_context *ctx)
+{
+ const struct writeback_control *wbc = ctx->wbc;
+ const struct extent_buffer *eb = ctx->eb;
+ struct btrfs_block_group *block_group = ctx->zoned_bg;
+
+ if (!btrfs_is_zoned(fs_info))
+ return 0;
+
+ if (block_group) {
+ if (block_group->start > eb->start ||
+ block_group->start + block_group->length <= eb->start) {
+ btrfs_put_block_group(block_group);
+ block_group = NULL;
+ ctx->zoned_bg = NULL;
+ }
+ }
+
+ if (!block_group) {
+ block_group = btrfs_lookup_block_group(fs_info, eb->start);
+ if (!block_group)
+ return 0;
+ ctx->zoned_bg = block_group;
+ }
+
+ if (block_group->meta_write_pointer == eb->start) {
+ struct btrfs_block_group **tgt;
+
+ if (!test_bit(BTRFS_FS_ACTIVE_ZONE_TRACKING, &fs_info->flags))
+ return 0;
+
+ if (block_group->flags & BTRFS_BLOCK_GROUP_SYSTEM)
+ tgt = &fs_info->active_system_bg;
+ else
+ tgt = &fs_info->active_meta_bg;
+ if (check_bg_is_active(ctx, tgt))
+ return 0;
+ }
+
+ /*
+ * Since we may release fs_info->zoned_meta_io_lock, someone can already
+ * start writing this eb. In that case, we can just bail out.
+ */
+ if (block_group->meta_write_pointer > eb->start)
+ return -EBUSY;
+
+ /* If for_sync, this hole will be filled with trasnsaction commit. */
+ if (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync)
+ return -EAGAIN;
+ return -EBUSY;
+}
+
+int btrfs_zoned_issue_zeroout(struct btrfs_device *device, u64 physical, u64 length)
+{
+ if (!btrfs_dev_is_sequential(device, physical))
+ return -EOPNOTSUPP;
+
+ return blkdev_issue_zeroout(device->bdev, physical >> SECTOR_SHIFT,
+ length >> SECTOR_SHIFT, GFP_NOFS, 0);
+}
+
+static int read_zone_info(struct btrfs_fs_info *fs_info, u64 logical,
+ struct blk_zone *zone)
+{
+ struct btrfs_io_context *bioc = NULL;
+ u64 mapped_length = PAGE_SIZE;
+ unsigned int nofs_flag;
+ int nmirrors;
+ int i, ret;
+
+ ret = btrfs_map_block(fs_info, BTRFS_MAP_GET_READ_MIRRORS, logical,
+ &mapped_length, &bioc, NULL, NULL, 1);
+ if (ret || !bioc || mapped_length < PAGE_SIZE) {
+ ret = -EIO;
+ goto out_put_bioc;
+ }
+
+ if (bioc->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
+ ret = -EINVAL;
+ goto out_put_bioc;
+ }
+
+ nofs_flag = memalloc_nofs_save();
+ nmirrors = (int)bioc->num_stripes;
+ for (i = 0; i < nmirrors; i++) {
+ u64 physical = bioc->stripes[i].physical;
+ struct btrfs_device *dev = bioc->stripes[i].dev;
+
+ /* Missing device */
+ if (!dev->bdev)
+ continue;
+
+ ret = btrfs_get_dev_zone(dev, physical, zone);
+ /* Failing device */
+ if (ret == -EIO || ret == -EOPNOTSUPP)
+ continue;
+ break;
+ }
+ memalloc_nofs_restore(nofs_flag);
+out_put_bioc:
+ btrfs_put_bioc(bioc);
+ return ret;
+}
+
+/*
+ * Synchronize write pointer in a zone at @physical_start on @tgt_dev, by
+ * filling zeros between @physical_pos to a write pointer of dev-replace
+ * source device.
+ */
+int btrfs_sync_zone_write_pointer(struct btrfs_device *tgt_dev, u64 logical,
+ u64 physical_start, u64 physical_pos)
+{
+ struct btrfs_fs_info *fs_info = tgt_dev->fs_info;
+ struct blk_zone zone;
+ u64 length;
+ u64 wp;
+ int ret;
+
+ if (!btrfs_dev_is_sequential(tgt_dev, physical_pos))
+ return 0;
+
+ ret = read_zone_info(fs_info, logical, &zone);
+ if (ret)
+ return ret;
+
+ wp = physical_start + ((zone.wp - zone.start) << SECTOR_SHIFT);
+
+ if (physical_pos == wp)
+ return 0;
+
+ if (physical_pos > wp)
+ return -EUCLEAN;
+
+ length = wp - physical_pos;
+ return btrfs_zoned_issue_zeroout(tgt_dev, physical_pos, length);
+}
+
+/*
+ * Activate block group and underlying device zones
+ *
+ * @block_group: the block group to activate
+ *
+ * Return: true on success, false otherwise
+ */
+bool btrfs_zone_activate(struct btrfs_block_group *block_group)
+{
+ struct btrfs_fs_info *fs_info = block_group->fs_info;
+ struct map_lookup *map;
+ struct btrfs_device *device;
+ u64 physical;
+ const bool is_data = (block_group->flags & BTRFS_BLOCK_GROUP_DATA);
+ bool ret;
+ int i;
+
+ if (!btrfs_is_zoned(block_group->fs_info))
+ return true;
+
+ map = block_group->physical_map;
+
+ spin_lock(&fs_info->zone_active_bgs_lock);
+ spin_lock(&block_group->lock);
+ if (test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &block_group->runtime_flags)) {
+ ret = true;
+ goto out_unlock;
+ }
+
+ /* No space left */
+ if (btrfs_zoned_bg_is_full(block_group)) {
+ ret = false;
+ goto out_unlock;
+ }
+
+ for (i = 0; i < map->num_stripes; i++) {
+ struct btrfs_zoned_device_info *zinfo;
+ int reserved = 0;
+
+ device = map->stripes[i].dev;
+ physical = map->stripes[i].physical;
+ zinfo = device->zone_info;
+
+ if (zinfo->max_active_zones == 0)
+ continue;
+
+ if (is_data)
+ reserved = zinfo->reserved_active_zones;
+ /*
+ * For the data block group, leave active zones for one
+ * metadata block group and one system block group.
+ */
+ if (atomic_read(&zinfo->active_zones_left) <= reserved) {
+ ret = false;
+ goto out_unlock;
+ }
+
+ if (!btrfs_dev_set_active_zone(device, physical)) {
+ /* Cannot activate the zone */
+ ret = false;
+ goto out_unlock;
+ }
+ if (!is_data)
+ zinfo->reserved_active_zones--;
+ }
+
+ /* Successfully activated all the zones */
+ set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &block_group->runtime_flags);
+ spin_unlock(&block_group->lock);
+
+ /* For the active block group list */
+ btrfs_get_block_group(block_group);
+ list_add_tail(&block_group->active_bg_list, &fs_info->zone_active_bgs);
+ spin_unlock(&fs_info->zone_active_bgs_lock);
+
+ return true;
+
+out_unlock:
+ spin_unlock(&block_group->lock);
+ spin_unlock(&fs_info->zone_active_bgs_lock);
+ return ret;
+}
+
+static void wait_eb_writebacks(struct btrfs_block_group *block_group)
+{
+ struct btrfs_fs_info *fs_info = block_group->fs_info;
+ const u64 end = block_group->start + block_group->length;
+ struct radix_tree_iter iter;
+ struct extent_buffer *eb;
+ void __rcu **slot;
+
+ rcu_read_lock();
+ radix_tree_for_each_slot(slot, &fs_info->buffer_radix, &iter,
+ block_group->start >> fs_info->sectorsize_bits) {
+ eb = radix_tree_deref_slot(slot);
+ if (!eb)
+ continue;
+ if (radix_tree_deref_retry(eb)) {
+ slot = radix_tree_iter_retry(&iter);
+ continue;
+ }
+
+ if (eb->start < block_group->start)
+ continue;
+ if (eb->start >= end)
+ break;
+
+ slot = radix_tree_iter_resume(slot, &iter);
+ rcu_read_unlock();
+ wait_on_extent_buffer_writeback(eb);
+ rcu_read_lock();
+ }
+ rcu_read_unlock();
+}
+
+static int do_zone_finish(struct btrfs_block_group *block_group, bool fully_written)
+{
+ struct btrfs_fs_info *fs_info = block_group->fs_info;
+ struct map_lookup *map;
+ const bool is_metadata = (block_group->flags &
+ (BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_SYSTEM));
+ int ret = 0;
+ int i;
+
+ spin_lock(&block_group->lock);
+ if (!test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &block_group->runtime_flags)) {
+ spin_unlock(&block_group->lock);
+ return 0;
+ }
+
+ /* Check if we have unwritten allocated space */
+ if (is_metadata &&
+ block_group->start + block_group->alloc_offset > block_group->meta_write_pointer) {
+ spin_unlock(&block_group->lock);
+ return -EAGAIN;
+ }
+
+ /*
+ * If we are sure that the block group is full (= no more room left for
+ * new allocation) and the IO for the last usable block is completed, we
+ * don't need to wait for the other IOs. This holds because we ensure
+ * the sequential IO submissions using the ZONE_APPEND command for data
+ * and block_group->meta_write_pointer for metadata.
+ */
+ if (!fully_written) {
+ if (test_bit(BLOCK_GROUP_FLAG_ZONED_DATA_RELOC, &block_group->runtime_flags)) {
+ spin_unlock(&block_group->lock);
+ return -EAGAIN;
+ }
+ spin_unlock(&block_group->lock);
+
+ ret = btrfs_inc_block_group_ro(block_group, false);
+ if (ret)
+ return ret;
+
+ /* Ensure all writes in this block group finish */
+ btrfs_wait_block_group_reservations(block_group);
+ /* No need to wait for NOCOW writers. Zoned mode does not allow that */
+ btrfs_wait_ordered_roots(fs_info, U64_MAX, block_group->start,
+ block_group->length);
+ /* Wait for extent buffers to be written. */
+ if (is_metadata)
+ wait_eb_writebacks(block_group);
+
+ spin_lock(&block_group->lock);
+
+ /*
+ * Bail out if someone already deactivated the block group, or
+ * allocated space is left in the block group.
+ */
+ if (!test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE,
+ &block_group->runtime_flags)) {
+ spin_unlock(&block_group->lock);
+ btrfs_dec_block_group_ro(block_group);
+ return 0;
+ }
+
+ if (block_group->reserved ||
+ test_bit(BLOCK_GROUP_FLAG_ZONED_DATA_RELOC,
+ &block_group->runtime_flags)) {
+ spin_unlock(&block_group->lock);
+ btrfs_dec_block_group_ro(block_group);
+ return -EAGAIN;
+ }
+ }
+
+ clear_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &block_group->runtime_flags);
+ block_group->alloc_offset = block_group->zone_capacity;
+ if (block_group->flags & (BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_SYSTEM))
+ block_group->meta_write_pointer = block_group->start +
+ block_group->zone_capacity;
+ block_group->free_space_ctl->free_space = 0;
+ btrfs_clear_treelog_bg(block_group);
+ btrfs_clear_data_reloc_bg(block_group);
+ spin_unlock(&block_group->lock);
+
+ map = block_group->physical_map;
+ for (i = 0; i < map->num_stripes; i++) {
+ struct btrfs_device *device = map->stripes[i].dev;
+ const u64 physical = map->stripes[i].physical;
+ struct btrfs_zoned_device_info *zinfo = device->zone_info;
+
+ if (zinfo->max_active_zones == 0)
+ continue;
+
+ ret = blkdev_zone_mgmt(device->bdev, REQ_OP_ZONE_FINISH,
+ physical >> SECTOR_SHIFT,
+ zinfo->zone_size >> SECTOR_SHIFT,
+ GFP_NOFS);
+
+ if (ret)
+ return ret;
+
+ if (!(block_group->flags & BTRFS_BLOCK_GROUP_DATA))
+ zinfo->reserved_active_zones++;
+ btrfs_dev_clear_active_zone(device, physical);
+ }
+
+ if (!fully_written)
+ btrfs_dec_block_group_ro(block_group);
+
+ spin_lock(&fs_info->zone_active_bgs_lock);
+ ASSERT(!list_empty(&block_group->active_bg_list));
+ list_del_init(&block_group->active_bg_list);
+ spin_unlock(&fs_info->zone_active_bgs_lock);
+
+ /* For active_bg_list */
+ btrfs_put_block_group(block_group);
+
+ clear_and_wake_up_bit(BTRFS_FS_NEED_ZONE_FINISH, &fs_info->flags);
+
+ return 0;
+}
+
+int btrfs_zone_finish(struct btrfs_block_group *block_group)
+{
+ if (!btrfs_is_zoned(block_group->fs_info))
+ return 0;
+
+ return do_zone_finish(block_group, false);
+}
+
+bool btrfs_can_activate_zone(struct btrfs_fs_devices *fs_devices, u64 flags)
+{
+ struct btrfs_fs_info *fs_info = fs_devices->fs_info;
+ struct btrfs_device *device;
+ bool ret = false;
+
+ if (!btrfs_is_zoned(fs_info))
+ return true;
+
+ /* Check if there is a device with active zones left */
+ mutex_lock(&fs_info->chunk_mutex);
+ spin_lock(&fs_info->zone_active_bgs_lock);
+ list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) {
+ struct btrfs_zoned_device_info *zinfo = device->zone_info;
+ int reserved = 0;
+
+ if (!device->bdev)
+ continue;
+
+ if (!zinfo->max_active_zones) {
+ ret = true;
+ break;
+ }
+
+ if (flags & BTRFS_BLOCK_GROUP_DATA)
+ reserved = zinfo->reserved_active_zones;
+
+ switch (flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
+ case 0: /* single */
+ ret = (atomic_read(&zinfo->active_zones_left) >= (1 + reserved));
+ break;
+ case BTRFS_BLOCK_GROUP_DUP:
+ ret = (atomic_read(&zinfo->active_zones_left) >= (2 + reserved));
+ break;
+ }
+ if (ret)
+ break;
+ }
+ spin_unlock(&fs_info->zone_active_bgs_lock);
+ mutex_unlock(&fs_info->chunk_mutex);
+
+ if (!ret)
+ set_bit(BTRFS_FS_NEED_ZONE_FINISH, &fs_info->flags);
+
+ return ret;
+}
+
+void btrfs_zone_finish_endio(struct btrfs_fs_info *fs_info, u64 logical, u64 length)
+{
+ struct btrfs_block_group *block_group;
+ u64 min_alloc_bytes;
+
+ if (!btrfs_is_zoned(fs_info))
+ return;
+
+ block_group = btrfs_lookup_block_group(fs_info, logical);
+ ASSERT(block_group);
+
+ /* No MIXED_BG on zoned btrfs. */
+ if (block_group->flags & BTRFS_BLOCK_GROUP_DATA)
+ min_alloc_bytes = fs_info->sectorsize;
+ else
+ min_alloc_bytes = fs_info->nodesize;
+
+ /* Bail out if we can allocate more data from this block group. */
+ if (logical + length + min_alloc_bytes <=
+ block_group->start + block_group->zone_capacity)
+ goto out;
+
+ do_zone_finish(block_group, true);
+
+out:
+ btrfs_put_block_group(block_group);
+}
+
+static void btrfs_zone_finish_endio_workfn(struct work_struct *work)
+{
+ struct btrfs_block_group *bg =
+ container_of(work, struct btrfs_block_group, zone_finish_work);
+
+ wait_on_extent_buffer_writeback(bg->last_eb);
+ free_extent_buffer(bg->last_eb);
+ btrfs_zone_finish_endio(bg->fs_info, bg->start, bg->length);
+ btrfs_put_block_group(bg);
+}
+
+void btrfs_schedule_zone_finish_bg(struct btrfs_block_group *bg,
+ struct extent_buffer *eb)
+{
+ if (!test_bit(BLOCK_GROUP_FLAG_SEQUENTIAL_ZONE, &bg->runtime_flags) ||
+ eb->start + eb->len * 2 <= bg->start + bg->zone_capacity)
+ return;
+
+ if (WARN_ON(bg->zone_finish_work.func == btrfs_zone_finish_endio_workfn)) {
+ btrfs_err(bg->fs_info, "double scheduling of bg %llu zone finishing",
+ bg->start);
+ return;
+ }
+
+ /* For the work */
+ btrfs_get_block_group(bg);
+ atomic_inc(&eb->refs);
+ bg->last_eb = eb;
+ INIT_WORK(&bg->zone_finish_work, btrfs_zone_finish_endio_workfn);
+ queue_work(system_unbound_wq, &bg->zone_finish_work);
+}
+
+void btrfs_clear_data_reloc_bg(struct btrfs_block_group *bg)
+{
+ struct btrfs_fs_info *fs_info = bg->fs_info;
+
+ spin_lock(&fs_info->relocation_bg_lock);
+ if (fs_info->data_reloc_bg == bg->start)
+ fs_info->data_reloc_bg = 0;
+ spin_unlock(&fs_info->relocation_bg_lock);
+}
+
+void btrfs_free_zone_cache(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
+ struct btrfs_device *device;
+
+ if (!btrfs_is_zoned(fs_info))
+ return;
+
+ mutex_lock(&fs_devices->device_list_mutex);
+ list_for_each_entry(device, &fs_devices->devices, dev_list) {
+ if (device->zone_info) {
+ vfree(device->zone_info->zone_cache);
+ device->zone_info->zone_cache = NULL;
+ }
+ }
+ mutex_unlock(&fs_devices->device_list_mutex);
+}
+
+bool btrfs_zoned_should_reclaim(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
+ struct btrfs_device *device;
+ u64 used = 0;
+ u64 total = 0;
+ u64 factor;
+
+ ASSERT(btrfs_is_zoned(fs_info));
+
+ if (fs_info->bg_reclaim_threshold == 0)
+ return false;
+
+ mutex_lock(&fs_devices->device_list_mutex);
+ list_for_each_entry(device, &fs_devices->devices, dev_list) {
+ if (!device->bdev)
+ continue;
+
+ total += device->disk_total_bytes;
+ used += device->bytes_used;
+ }
+ mutex_unlock(&fs_devices->device_list_mutex);
+
+ factor = div64_u64(used * 100, total);
+ return factor >= fs_info->bg_reclaim_threshold;
+}
+
+void btrfs_zoned_release_data_reloc_bg(struct btrfs_fs_info *fs_info, u64 logical,
+ u64 length)
+{
+ struct btrfs_block_group *block_group;
+
+ if (!btrfs_is_zoned(fs_info))
+ return;
+
+ block_group = btrfs_lookup_block_group(fs_info, logical);
+ /* It should be called on a previous data relocation block group. */
+ ASSERT(block_group && (block_group->flags & BTRFS_BLOCK_GROUP_DATA));
+
+ spin_lock(&block_group->lock);
+ if (!test_bit(BLOCK_GROUP_FLAG_ZONED_DATA_RELOC, &block_group->runtime_flags))
+ goto out;
+
+ /* All relocation extents are written. */
+ if (block_group->start + block_group->alloc_offset == logical + length) {
+ /*
+ * Now, release this block group for further allocations and
+ * zone finish.
+ */
+ clear_bit(BLOCK_GROUP_FLAG_ZONED_DATA_RELOC,
+ &block_group->runtime_flags);
+ }
+
+out:
+ spin_unlock(&block_group->lock);
+ btrfs_put_block_group(block_group);
+}
+
+int btrfs_zone_finish_one_bg(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_block_group *block_group;
+ struct btrfs_block_group *min_bg = NULL;
+ u64 min_avail = U64_MAX;
+ int ret;
+
+ spin_lock(&fs_info->zone_active_bgs_lock);
+ list_for_each_entry(block_group, &fs_info->zone_active_bgs,
+ active_bg_list) {
+ u64 avail;
+
+ spin_lock(&block_group->lock);
+ if (block_group->reserved || block_group->alloc_offset == 0 ||
+ (block_group->flags & BTRFS_BLOCK_GROUP_SYSTEM) ||
+ test_bit(BLOCK_GROUP_FLAG_ZONED_DATA_RELOC, &block_group->runtime_flags)) {
+ spin_unlock(&block_group->lock);
+ continue;
+ }
+
+ avail = block_group->zone_capacity - block_group->alloc_offset;
+ if (min_avail > avail) {
+ if (min_bg)
+ btrfs_put_block_group(min_bg);
+ min_bg = block_group;
+ min_avail = avail;
+ btrfs_get_block_group(min_bg);
+ }
+ spin_unlock(&block_group->lock);
+ }
+ spin_unlock(&fs_info->zone_active_bgs_lock);
+
+ if (!min_bg)
+ return 0;
+
+ ret = btrfs_zone_finish(min_bg);
+ btrfs_put_block_group(min_bg);
+
+ return ret < 0 ? ret : 1;
+}
+
+int btrfs_zoned_activate_one_bg(struct btrfs_fs_info *fs_info,
+ struct btrfs_space_info *space_info,
+ bool do_finish)
+{
+ struct btrfs_block_group *bg;
+ int index;
+
+ if (!btrfs_is_zoned(fs_info) || (space_info->flags & BTRFS_BLOCK_GROUP_DATA))
+ return 0;
+
+ for (;;) {
+ int ret;
+ bool need_finish = false;
+
+ down_read(&space_info->groups_sem);
+ for (index = 0; index < BTRFS_NR_RAID_TYPES; index++) {
+ list_for_each_entry(bg, &space_info->block_groups[index],
+ list) {
+ if (!spin_trylock(&bg->lock))
+ continue;
+ if (btrfs_zoned_bg_is_full(bg) ||
+ test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE,
+ &bg->runtime_flags)) {
+ spin_unlock(&bg->lock);
+ continue;
+ }
+ spin_unlock(&bg->lock);
+
+ if (btrfs_zone_activate(bg)) {
+ up_read(&space_info->groups_sem);
+ return 1;
+ }
+
+ need_finish = true;
+ }
+ }
+ up_read(&space_info->groups_sem);
+
+ if (!do_finish || !need_finish)
+ break;
+
+ ret = btrfs_zone_finish_one_bg(fs_info);
+ if (ret == 0)
+ break;
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
+ * Reserve zones for one metadata block group, one tree-log block group, and one
+ * system block group.
+ */
+void btrfs_check_active_zone_reservation(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
+ struct btrfs_block_group *block_group;
+ struct btrfs_device *device;
+ /* Reserve zones for normal SINGLE metadata and tree-log block group. */
+ unsigned int metadata_reserve = 2;
+ /* Reserve a zone for SINGLE system block group. */
+ unsigned int system_reserve = 1;
+
+ if (!test_bit(BTRFS_FS_ACTIVE_ZONE_TRACKING, &fs_info->flags))
+ return;
+
+ /*
+ * This function is called from the mount context. So, there is no
+ * parallel process touching the bits. No need for read_seqretry().
+ */
+ if (fs_info->avail_metadata_alloc_bits & BTRFS_BLOCK_GROUP_DUP)
+ metadata_reserve = 4;
+ if (fs_info->avail_system_alloc_bits & BTRFS_BLOCK_GROUP_DUP)
+ system_reserve = 2;
+
+ /* Apply the reservation on all the devices. */
+ mutex_lock(&fs_devices->device_list_mutex);
+ list_for_each_entry(device, &fs_devices->devices, dev_list) {
+ if (!device->bdev)
+ continue;
+
+ device->zone_info->reserved_active_zones =
+ metadata_reserve + system_reserve;
+ }
+ mutex_unlock(&fs_devices->device_list_mutex);
+
+ /* Release reservation for currently active block groups. */
+ spin_lock(&fs_info->zone_active_bgs_lock);
+ list_for_each_entry(block_group, &fs_info->zone_active_bgs, active_bg_list) {
+ struct map_lookup *map = block_group->physical_map;
+
+ if (!(block_group->flags &
+ (BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_SYSTEM)))
+ continue;
+
+ for (int i = 0; i < map->num_stripes; i++)
+ map->stripes[i].dev->zone_info->reserved_active_zones--;
+ }
+ spin_unlock(&fs_info->zone_active_bgs_lock);
+}