// SPDX-License-Identifier: GPL-2.0
+#include <linux/bitops.h>
#include <linux/slab.h>
#include <linux/blkdev.h>
+#include <linux/sched/mm.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"
/* 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)
/* Number of superblock log zones */
#define BTRFS_NR_SB_LOG_ZONES 2
return 0;
}
+/*
+ * 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)
{
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;
+ }
+
ret = blkdev_report_zones(device->bdev, pos >> SECTOR_SHIFT, *nr_zones,
copy_zone_info_cb, zones);
if (ret < 0) {
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_item(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);
+ if (ret)
+ break;
+ }
+ mutex_unlock(&fs_devices->device_list_mutex);
+
+ return ret;
+}
+
int btrfs_get_dev_zone_info(struct btrfs_device *device)
{
+ struct btrfs_fs_info *fs_info = device->fs_info;
struct btrfs_zoned_device_info *zone_info = NULL;
struct block_device *bdev = device->bdev;
struct request_queue *queue = bdev_get_queue(bdev);
struct blk_zone *zones = NULL;
unsigned int i, nreported = 0, nr_zones;
unsigned int zone_sectors;
+ char *model, *emulated;
int ret;
- if (!bdev_is_zoned(bdev))
+ /*
+ * 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)
if (!zone_info)
return -ENOMEM;
+ 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);
+ }
+
nr_sectors = bdev_nr_sectors(bdev);
- zone_sectors = bdev_zone_sectors(bdev);
/* Check if it's power of 2 (see is_power_of_2) */
ASSERT(zone_sectors != 0 && (zone_sectors & (zone_sectors - 1)) == 0);
zone_info->zone_size = zone_sectors << SECTOR_SHIFT;
device->zone_info = zone_info;
- /* device->fs_info is not safe to use for printing messages */
- btrfs_info_in_rcu(NULL,
- "host-%s zoned block device %s, %u zones of %llu bytes",
- bdev_zoned_model(bdev) == BLK_ZONED_HM ? "managed" : "aware",
- rcu_str_deref(device->name), zone_info->nr_zones,
- zone_info->zone_size);
+ 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:
kfree(zones);
+out_free_zone_info:
bitmap_free(zone_info->empty_zones);
bitmap_free(zone_info->seq_zones);
kfree(zone_info);
+ device->zone_info = NULL;
return ret;
}
u64 nr_devices = 0;
u64 zone_size = 0;
u64 max_zone_append_size = 0;
- const bool incompat_zoned = btrfs_is_zoned(fs_info);
+ const bool incompat_zoned = btrfs_fs_incompat(fs_info, ZONED);
int ret = 0;
/* Count zoned devices */
continue;
model = bdev_zoned_model(device->bdev);
+ /*
+ * A Host-Managed zoned device must be used as a zoned device.
+ * A Host-Aware zoned device and a non-zoned devices can be
+ * treated as a zoned device, if ZONED flag is enabled in the
+ * superblock.
+ */
if (model == BLK_ZONED_HM ||
- (model == BLK_ZONED_HA && incompat_zoned)) {
- struct btrfs_zoned_device_info *zone_info;
+ (model == BLK_ZONED_HA && incompat_zoned) ||
+ (model == BLK_ZONED_NONE && incompat_zoned)) {
+ struct btrfs_zoned_device_info *zone_info =
+ device->zone_info;
zone_info = device->zone_info;
zoned_devices++;
fs_info->zone_size = zone_size;
fs_info->max_zone_append_size = max_zone_append_size;
+ fs_info->fs_devices->chunk_alloc_policy = BTRFS_CHUNK_ALLOC_ZONED;
+
+ /*
+ * 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)
+ goto out;
btrfs_info(fs_info, "zoned mode enabled with zone size %llu", zone_size);
out:
unsigned int zone_sectors;
u32 sb_zone;
int ret;
- u64 zone_size;
u8 zone_sectors_shift;
sector_t nr_sectors;
u32 nr_zones;
zone_sectors = bdev_zone_sectors(bdev);
if (!is_power_of_2(zone_sectors))
return -EINVAL;
- zone_size = zone_sectors << SECTOR_SHIFT;
zone_sectors_shift = ilog2(zone_sectors);
nr_sectors = bdev_nr_sectors(bdev);
nr_zones = nr_sectors >> zone_sectors_shift;
struct btrfs_zoned_device_info *zinfo = device->zone_info;
u32 zone_num;
- if (!zinfo) {
+ /*
+ * 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;
}
sb_zone << zone_sectors_shift,
zone_sectors * BTRFS_NR_SB_LOG_ZONES, GFP_NOFS);
}
+
+/**
+ * btrfs_find_allocatable_zones - 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) &&
+ find_next_zero_bit(zinfo->empty_zones, end, begin) != end) {
+ 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 = ((u64)sb_zone + BTRFS_NR_SB_LOG_ZONES) << shift;
+ 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;
+}
+
+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);
+ 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 end = (start + size) >> shift;
+ u64 pos;
+ int ret;
+
+ ASSERT(IS_ALIGNED(start, zinfo->zone_size));
+ ASSERT(IS_ALIGNED(size, zinfo->zone_size));
+
+ if (end > zinfo->nr_zones)
+ return -ERANGE;
+
+ /* All the zones are conventional */
+ if (find_next_bit(zinfo->seq_zones, begin, end) == end)
+ return 0;
+
+ /* All the zones are sequential and empty */
+ if (find_next_zero_bit(zinfo->seq_zones, begin, end) == end &&
+ find_next_zero_bit(zinfo->empty_zones, begin, end) == end)
+ 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)
+{
+ struct btrfs_fs_info *fs_info = cache->fs_info;
+ struct btrfs_root *root = fs_info->extent_root;
+ struct btrfs_path *path;
+ struct btrfs_key key;
+ struct btrfs_key found_key;
+ int ret;
+ u64 length;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ key.objectid = cache->start + cache->length;
+ key.type = 0;
+ key.offset = 0;
+
+ 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;
+ u64 physical = 0;
+ int ret;
+ int i;
+ unsigned int nofs_flag;
+ u64 *alloc_offsets = 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;
+
+ alloc_offsets = kcalloc(map->num_stripes, sizeof(*alloc_offsets), GFP_NOFS);
+ if (!alloc_offsets) {
+ free_extent_map(em);
+ return -ENOMEM;
+ }
+
+ 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 = map->stripes[i].physical;
+
+ if (device->bdev == NULL) {
+ alloc_offsets[i] = WP_MISSING_DEV;
+ continue;
+ }
+
+ is_sequential = btrfs_dev_is_sequential(device, physical);
+ if (is_sequential)
+ num_sequential++;
+ else
+ num_conventional++;
+
+ 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);
+
+ 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);
+ 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, fs_info->zone_size));
+ nofs_flag = memalloc_nofs_save();
+ ret = btrfs_get_dev_zone(device, physical, &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;
+ }
+
+ 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 >> 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] = fs_info->zone_size;
+ break;
+ default:
+ /* Partially used zone */
+ alloc_offsets[i] =
+ ((zone.wp - zone.start) << SECTOR_SHIFT);
+ break;
+ }
+ }
+
+ if (num_sequential > 0)
+ cache->seq_zone = true;
+
+ if (num_conventional > 0) {
+ /*
+ * Avoid calling calculate_alloc_pointer() for new BG. It
+ * is no use for new BG. It must be always 0.
+ *
+ * Also, we have a lock chain of extent buffer lock ->
+ * chunk mutex. For new BG, 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) {
+ cache->alloc_offset = 0;
+ goto out;
+ }
+ ret = calculate_alloc_pointer(cache, &last_alloc);
+ if (ret || map->num_stripes == num_conventional) {
+ if (!ret)
+ cache->alloc_offset = last_alloc;
+ else
+ btrfs_err(fs_info,
+ "zoned: failed to determine allocation offset of bg %llu",
+ cache->start);
+ goto out;
+ }
+ }
+
+ switch (map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
+ case 0: /* single */
+ cache->alloc_offset = alloc_offsets[0];
+ break;
+ case BTRFS_BLOCK_GROUP_DUP:
+ 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:
+ /* 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;
+
+ 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;
+ free = cache->length - cache->alloc_offset;
+
+ /* We only need ->free_space in ALLOC_SEQ block groups */
+ cache->last_byte_to_unpin = (u64)-1;
+ cache->cached = BTRFS_CACHE_FINISHED;
+ cache->free_space_ctl->free_space = free;
+ cache->zone_unusable = unusable;
+
+ /* Should not have any excluded extents. Just in case, though */
+ btrfs_free_excluded_extents(cache);
+}
+
+void btrfs_redirty_list_add(struct btrfs_transaction *trans,
+ struct extent_buffer *eb)
+{
+ struct btrfs_fs_info *fs_info = eb->fs_info;
+
+ if (!btrfs_is_zoned(fs_info) ||
+ btrfs_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN) ||
+ !list_empty(&eb->release_list))
+ return;
+
+ set_extent_buffer_dirty(eb);
+ set_extent_bits_nowait(&trans->dirty_pages, eb->start,
+ eb->start + eb->len - 1, EXTENT_DIRTY);
+ memzero_extent_buffer(eb, 0, eb->len);
+ set_bit(EXTENT_BUFFER_NO_CHECK, &eb->bflags);
+
+ spin_lock(&trans->releasing_ebs_lock);
+ list_add_tail(&eb->release_list, &trans->releasing_ebs);
+ spin_unlock(&trans->releasing_ebs_lock);
+ atomic_inc(&eb->refs);
+}
+
+void btrfs_free_redirty_list(struct btrfs_transaction *trans)
+{
+ spin_lock(&trans->releasing_ebs_lock);
+ while (!list_empty(&trans->releasing_ebs)) {
+ struct extent_buffer *eb;
+
+ eb = list_first_entry(&trans->releasing_ebs,
+ struct extent_buffer, release_list);
+ list_del_init(&eb->release_list);
+ free_extent_buffer(eb);
+ }
+ spin_unlock(&trans->releasing_ebs_lock);
+}
+
+bool btrfs_use_zone_append(struct btrfs_inode *inode, struct extent_map *em)
+{
+ struct btrfs_fs_info *fs_info = inode->root->fs_info;
+ struct btrfs_block_group *cache;
+ bool ret = false;
+
+ if (!btrfs_is_zoned(fs_info))
+ return false;
+
+ if (!fs_info->max_zone_append_size)
+ return false;
+
+ if (!is_data_inode(&inode->vfs_inode))
+ return false;
+
+ cache = btrfs_lookup_block_group(fs_info, em->block_start);
+ ASSERT(cache);
+ if (!cache)
+ return false;
+
+ ret = cache->seq_zone;
+ btrfs_put_block_group(cache);
+
+ return ret;
+}
+
+void btrfs_record_physical_zoned(struct inode *inode, u64 file_offset,
+ struct bio *bio)
+{
+ struct btrfs_ordered_extent *ordered;
+ const u64 physical = bio->bi_iter.bi_sector << SECTOR_SHIFT;
+
+ if (bio_op(bio) != REQ_OP_ZONE_APPEND)
+ return;
+
+ ordered = btrfs_lookup_ordered_extent(BTRFS_I(inode), file_offset);
+ if (WARN_ON(!ordered))
+ return;
+
+ ordered->physical = physical;
+ ordered->disk = bio->bi_bdev->bd_disk;
+ ordered->partno = bio->bi_bdev->bd_partno;
+
+ btrfs_put_ordered_extent(ordered);
+}
+
+void btrfs_rewrite_logical_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 extent_map_tree *em_tree;
+ struct extent_map *em;
+ struct btrfs_ordered_sum *sum;
+ struct block_device *bdev;
+ u64 orig_logical = ordered->disk_bytenr;
+ u64 *logical = NULL;
+ int nr, stripe_len;
+
+ /* Zoned devices should not have partitions. So, we can assume it is 0 */
+ ASSERT(ordered->partno == 0);
+ bdev = bdgrab(ordered->disk->part0);
+ if (WARN_ON(!bdev))
+ return;
+
+ if (WARN_ON(btrfs_rmap_block(fs_info, orig_logical, bdev,
+ ordered->physical, &logical, &nr,
+ &stripe_len)))
+ goto out;
+
+ WARN_ON(nr != 1);
+
+ if (orig_logical == *logical)
+ goto out;
+
+ ordered->disk_bytenr = *logical;
+
+ em_tree = &inode->extent_tree;
+ 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);
+
+ list_for_each_entry(sum, &ordered->list, list) {
+ if (*logical < orig_logical)
+ sum->bytenr -= orig_logical - *logical;
+ else
+ sum->bytenr += *logical - orig_logical;
+ }
+
+out:
+ kfree(logical);
+ bdput(bdev);
+}
+
+bool btrfs_check_meta_write_pointer(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *eb,
+ struct btrfs_block_group **cache_ret)
+{
+ struct btrfs_block_group *cache;
+ bool ret = true;
+
+ if (!btrfs_is_zoned(fs_info))
+ return true;
+
+ cache = *cache_ret;
+
+ if (cache && (eb->start < cache->start ||
+ cache->start + cache->length <= eb->start)) {
+ btrfs_put_block_group(cache);
+ cache = NULL;
+ *cache_ret = NULL;
+ }
+
+ if (!cache)
+ cache = btrfs_lookup_block_group(fs_info, eb->start);
+
+ if (cache) {
+ if (cache->meta_write_pointer != eb->start) {
+ btrfs_put_block_group(cache);
+ cache = NULL;
+ ret = false;
+ } else {
+ cache->meta_write_pointer = eb->start + eb->len;
+ }
+
+ *cache_ret = cache;
+ }
+
+ return ret;
+}
+
+void btrfs_revert_meta_write_pointer(struct btrfs_block_group *cache,
+ struct extent_buffer *eb)
+{
+ if (!btrfs_is_zoned(eb->fs_info) || !cache)
+ return;
+
+ ASSERT(cache->meta_write_pointer == eb->start + eb->len);
+ cache->meta_write_pointer = eb->start;
+}
+
+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_bio *bbio = NULL;
+ u64 mapped_length = PAGE_SIZE;
+ unsigned int nofs_flag;
+ int nmirrors;
+ int i, ret;
+
+ ret = btrfs_map_sblock(fs_info, BTRFS_MAP_GET_READ_MIRRORS, logical,
+ &mapped_length, &bbio);
+ if (ret || !bbio || mapped_length < PAGE_SIZE) {
+ btrfs_put_bbio(bbio);
+ return -EIO;
+ }
+
+ if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK)
+ return -EINVAL;
+
+ nofs_flag = memalloc_nofs_save();
+ nmirrors = (int)bbio->num_stripes;
+ for (i = 0; i < nmirrors; i++) {
+ u64 physical = bbio->stripes[i].physical;
+ struct btrfs_device *dev = bbio->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);
+
+ 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);
+}
projects / linux-2.6-microblaze.git / blobdiff