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961f5b8bf4
In zoned mode the sequential status of zone can be also tracked in the runtime flags of block group. Reviewed-by: Anand Jain <anand.jain@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
2352 lines
60 KiB
C
2352 lines
60 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/bitops.h>
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#include <linux/slab.h>
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#include <linux/blkdev.h>
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#include <linux/sched/mm.h>
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#include <linux/atomic.h>
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#include <linux/vmalloc.h>
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#include "ctree.h"
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#include "volumes.h"
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#include "zoned.h"
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#include "rcu-string.h"
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#include "disk-io.h"
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#include "block-group.h"
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#include "transaction.h"
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#include "dev-replace.h"
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#include "space-info.h"
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#include "fs.h"
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#include "accessors.h"
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/* Maximum number of zones to report per blkdev_report_zones() call */
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#define BTRFS_REPORT_NR_ZONES 4096
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/* Invalid allocation pointer value for missing devices */
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#define WP_MISSING_DEV ((u64)-1)
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/* Pseudo write pointer value for conventional zone */
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#define WP_CONVENTIONAL ((u64)-2)
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/*
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* Location of the first zone of superblock logging zone pairs.
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*
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* - primary superblock: 0B (zone 0)
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* - first copy: 512G (zone starting at that offset)
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* - second copy: 4T (zone starting at that offset)
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*/
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#define BTRFS_SB_LOG_PRIMARY_OFFSET (0ULL)
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#define BTRFS_SB_LOG_FIRST_OFFSET (512ULL * SZ_1G)
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#define BTRFS_SB_LOG_SECOND_OFFSET (4096ULL * SZ_1G)
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#define BTRFS_SB_LOG_FIRST_SHIFT const_ilog2(BTRFS_SB_LOG_FIRST_OFFSET)
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#define BTRFS_SB_LOG_SECOND_SHIFT const_ilog2(BTRFS_SB_LOG_SECOND_OFFSET)
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/* Number of superblock log zones */
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#define BTRFS_NR_SB_LOG_ZONES 2
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/*
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* Minimum of active zones we need:
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*
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* - BTRFS_SUPER_MIRROR_MAX zones for superblock mirrors
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* - 3 zones to ensure at least one zone per SYSTEM, META and DATA block group
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* - 1 zone for tree-log dedicated block group
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* - 1 zone for relocation
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*/
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#define BTRFS_MIN_ACTIVE_ZONES (BTRFS_SUPER_MIRROR_MAX + 5)
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/*
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* Minimum / maximum supported zone size. Currently, SMR disks have a zone
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* size of 256MiB, and we are expecting ZNS drives to be in the 1-4GiB range.
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* We do not expect the zone size to become larger than 8GiB or smaller than
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* 4MiB in the near future.
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*/
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#define BTRFS_MAX_ZONE_SIZE SZ_8G
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#define BTRFS_MIN_ZONE_SIZE SZ_4M
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#define SUPER_INFO_SECTORS ((u64)BTRFS_SUPER_INFO_SIZE >> SECTOR_SHIFT)
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static inline bool sb_zone_is_full(const struct blk_zone *zone)
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{
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return (zone->cond == BLK_ZONE_COND_FULL) ||
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(zone->wp + SUPER_INFO_SECTORS > zone->start + zone->capacity);
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}
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static int copy_zone_info_cb(struct blk_zone *zone, unsigned int idx, void *data)
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{
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struct blk_zone *zones = data;
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memcpy(&zones[idx], zone, sizeof(*zone));
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return 0;
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}
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static int sb_write_pointer(struct block_device *bdev, struct blk_zone *zones,
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u64 *wp_ret)
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{
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bool empty[BTRFS_NR_SB_LOG_ZONES];
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bool full[BTRFS_NR_SB_LOG_ZONES];
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sector_t sector;
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int i;
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for (i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++) {
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ASSERT(zones[i].type != BLK_ZONE_TYPE_CONVENTIONAL);
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empty[i] = (zones[i].cond == BLK_ZONE_COND_EMPTY);
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full[i] = sb_zone_is_full(&zones[i]);
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}
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/*
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* Possible states of log buffer zones
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*
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* Empty[0] In use[0] Full[0]
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* Empty[1] * 0 1
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* In use[1] x x 1
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* Full[1] 0 0 C
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*
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* Log position:
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* *: Special case, no superblock is written
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* 0: Use write pointer of zones[0]
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* 1: Use write pointer of zones[1]
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* C: Compare super blocks from zones[0] and zones[1], use the latest
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* one determined by generation
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* x: Invalid state
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*/
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if (empty[0] && empty[1]) {
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/* Special case to distinguish no superblock to read */
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*wp_ret = zones[0].start << SECTOR_SHIFT;
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return -ENOENT;
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} else if (full[0] && full[1]) {
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/* Compare two super blocks */
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struct address_space *mapping = bdev->bd_inode->i_mapping;
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struct page *page[BTRFS_NR_SB_LOG_ZONES];
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struct btrfs_super_block *super[BTRFS_NR_SB_LOG_ZONES];
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int i;
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for (i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++) {
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u64 bytenr;
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bytenr = ((zones[i].start + zones[i].len)
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<< SECTOR_SHIFT) - BTRFS_SUPER_INFO_SIZE;
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page[i] = read_cache_page_gfp(mapping,
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bytenr >> PAGE_SHIFT, GFP_NOFS);
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if (IS_ERR(page[i])) {
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if (i == 1)
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btrfs_release_disk_super(super[0]);
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return PTR_ERR(page[i]);
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}
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super[i] = page_address(page[i]);
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}
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if (btrfs_super_generation(super[0]) >
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btrfs_super_generation(super[1]))
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sector = zones[1].start;
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else
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sector = zones[0].start;
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for (i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++)
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btrfs_release_disk_super(super[i]);
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} else if (!full[0] && (empty[1] || full[1])) {
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sector = zones[0].wp;
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} else if (full[0]) {
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sector = zones[1].wp;
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} else {
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return -EUCLEAN;
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}
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*wp_ret = sector << SECTOR_SHIFT;
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return 0;
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}
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/*
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* Get the first zone number of the superblock mirror
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*/
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static inline u32 sb_zone_number(int shift, int mirror)
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{
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u64 zone;
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ASSERT(mirror < BTRFS_SUPER_MIRROR_MAX);
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switch (mirror) {
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case 0: zone = 0; break;
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case 1: zone = 1ULL << (BTRFS_SB_LOG_FIRST_SHIFT - shift); break;
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case 2: zone = 1ULL << (BTRFS_SB_LOG_SECOND_SHIFT - shift); break;
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}
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ASSERT(zone <= U32_MAX);
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return (u32)zone;
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}
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static inline sector_t zone_start_sector(u32 zone_number,
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struct block_device *bdev)
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{
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return (sector_t)zone_number << ilog2(bdev_zone_sectors(bdev));
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}
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static inline u64 zone_start_physical(u32 zone_number,
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struct btrfs_zoned_device_info *zone_info)
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{
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return (u64)zone_number << zone_info->zone_size_shift;
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}
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/*
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* Emulate blkdev_report_zones() for a non-zoned device. It slices up the block
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* device into static sized chunks and fake a conventional zone on each of
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* them.
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*/
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static int emulate_report_zones(struct btrfs_device *device, u64 pos,
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struct blk_zone *zones, unsigned int nr_zones)
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{
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const sector_t zone_sectors = device->fs_info->zone_size >> SECTOR_SHIFT;
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sector_t bdev_size = bdev_nr_sectors(device->bdev);
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unsigned int i;
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pos >>= SECTOR_SHIFT;
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for (i = 0; i < nr_zones; i++) {
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zones[i].start = i * zone_sectors + pos;
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zones[i].len = zone_sectors;
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zones[i].capacity = zone_sectors;
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zones[i].wp = zones[i].start + zone_sectors;
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zones[i].type = BLK_ZONE_TYPE_CONVENTIONAL;
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zones[i].cond = BLK_ZONE_COND_NOT_WP;
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if (zones[i].wp >= bdev_size) {
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i++;
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break;
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}
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}
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return i;
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}
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static int btrfs_get_dev_zones(struct btrfs_device *device, u64 pos,
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struct blk_zone *zones, unsigned int *nr_zones)
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{
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struct btrfs_zoned_device_info *zinfo = device->zone_info;
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u32 zno;
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int ret;
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if (!*nr_zones)
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return 0;
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if (!bdev_is_zoned(device->bdev)) {
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ret = emulate_report_zones(device, pos, zones, *nr_zones);
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*nr_zones = ret;
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return 0;
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}
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/* Check cache */
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if (zinfo->zone_cache) {
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unsigned int i;
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ASSERT(IS_ALIGNED(pos, zinfo->zone_size));
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zno = pos >> zinfo->zone_size_shift;
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/*
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* We cannot report zones beyond the zone end. So, it is OK to
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* cap *nr_zones to at the end.
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*/
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*nr_zones = min_t(u32, *nr_zones, zinfo->nr_zones - zno);
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for (i = 0; i < *nr_zones; i++) {
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struct blk_zone *zone_info;
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zone_info = &zinfo->zone_cache[zno + i];
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if (!zone_info->len)
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break;
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}
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if (i == *nr_zones) {
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/* Cache hit on all the zones */
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memcpy(zones, zinfo->zone_cache + zno,
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sizeof(*zinfo->zone_cache) * *nr_zones);
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return 0;
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}
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}
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ret = blkdev_report_zones(device->bdev, pos >> SECTOR_SHIFT, *nr_zones,
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copy_zone_info_cb, zones);
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if (ret < 0) {
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btrfs_err_in_rcu(device->fs_info,
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"zoned: failed to read zone %llu on %s (devid %llu)",
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pos, rcu_str_deref(device->name),
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device->devid);
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return ret;
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}
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*nr_zones = ret;
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if (!ret)
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return -EIO;
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/* Populate cache */
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if (zinfo->zone_cache)
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memcpy(zinfo->zone_cache + zno, zones,
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sizeof(*zinfo->zone_cache) * *nr_zones);
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return 0;
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}
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/* The emulated zone size is determined from the size of device extent */
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static int calculate_emulated_zone_size(struct btrfs_fs_info *fs_info)
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{
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struct btrfs_path *path;
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struct btrfs_root *root = fs_info->dev_root;
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struct btrfs_key key;
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struct extent_buffer *leaf;
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struct btrfs_dev_extent *dext;
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int ret = 0;
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key.objectid = 1;
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key.type = BTRFS_DEV_EXTENT_KEY;
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key.offset = 0;
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path = btrfs_alloc_path();
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if (!path)
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return -ENOMEM;
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ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
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if (ret < 0)
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goto out;
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if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
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ret = btrfs_next_leaf(root, path);
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if (ret < 0)
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goto out;
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/* No dev extents at all? Not good */
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if (ret > 0) {
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ret = -EUCLEAN;
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goto out;
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}
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}
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leaf = path->nodes[0];
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dext = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_extent);
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fs_info->zone_size = btrfs_dev_extent_length(leaf, dext);
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ret = 0;
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out:
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btrfs_free_path(path);
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return ret;
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}
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int btrfs_get_dev_zone_info_all_devices(struct btrfs_fs_info *fs_info)
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{
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struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
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struct btrfs_device *device;
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int ret = 0;
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/* fs_info->zone_size might not set yet. Use the incomapt flag here. */
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if (!btrfs_fs_incompat(fs_info, ZONED))
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return 0;
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mutex_lock(&fs_devices->device_list_mutex);
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list_for_each_entry(device, &fs_devices->devices, dev_list) {
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/* We can skip reading of zone info for missing devices */
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if (!device->bdev)
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continue;
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ret = btrfs_get_dev_zone_info(device, true);
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if (ret)
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break;
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}
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mutex_unlock(&fs_devices->device_list_mutex);
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return ret;
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}
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int btrfs_get_dev_zone_info(struct btrfs_device *device, bool populate_cache)
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{
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struct btrfs_fs_info *fs_info = device->fs_info;
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struct btrfs_zoned_device_info *zone_info = NULL;
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struct block_device *bdev = device->bdev;
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unsigned int max_active_zones;
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unsigned int nactive;
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sector_t nr_sectors;
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sector_t sector = 0;
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struct blk_zone *zones = NULL;
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unsigned int i, nreported = 0, nr_zones;
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sector_t zone_sectors;
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char *model, *emulated;
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int ret;
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/*
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* Cannot use btrfs_is_zoned here, since fs_info::zone_size might not
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* yet be set.
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*/
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if (!btrfs_fs_incompat(fs_info, ZONED))
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return 0;
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if (device->zone_info)
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return 0;
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zone_info = kzalloc(sizeof(*zone_info), GFP_KERNEL);
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if (!zone_info)
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return -ENOMEM;
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device->zone_info = zone_info;
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if (!bdev_is_zoned(bdev)) {
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if (!fs_info->zone_size) {
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ret = calculate_emulated_zone_size(fs_info);
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if (ret)
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goto out;
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}
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ASSERT(fs_info->zone_size);
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zone_sectors = fs_info->zone_size >> SECTOR_SHIFT;
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} else {
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zone_sectors = bdev_zone_sectors(bdev);
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}
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ASSERT(is_power_of_two_u64(zone_sectors));
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zone_info->zone_size = zone_sectors << SECTOR_SHIFT;
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/* We reject devices with a zone size larger than 8GB */
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if (zone_info->zone_size > BTRFS_MAX_ZONE_SIZE) {
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btrfs_err_in_rcu(fs_info,
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"zoned: %s: zone size %llu larger than supported maximum %llu",
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rcu_str_deref(device->name),
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zone_info->zone_size, BTRFS_MAX_ZONE_SIZE);
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ret = -EINVAL;
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goto out;
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} else if (zone_info->zone_size < BTRFS_MIN_ZONE_SIZE) {
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btrfs_err_in_rcu(fs_info,
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"zoned: %s: zone size %llu smaller than supported minimum %u",
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rcu_str_deref(device->name),
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zone_info->zone_size, BTRFS_MIN_ZONE_SIZE);
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ret = -EINVAL;
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goto out;
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}
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|
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nr_sectors = bdev_nr_sectors(bdev);
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zone_info->zone_size_shift = ilog2(zone_info->zone_size);
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zone_info->nr_zones = nr_sectors >> ilog2(zone_sectors);
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/*
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* We limit max_zone_append_size also by max_segments *
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* PAGE_SIZE. Technically, we can have multiple pages per segment. But,
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* since btrfs adds the pages one by one to a bio, and btrfs cannot
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* increase the metadata reservation even if it increases the number of
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* extents, it is safe to stick with the limit.
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*
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* With the zoned emulation, we can have non-zoned device on the zoned
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* mode. In this case, we don't have a valid max zone append size. So,
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* use max_segments * PAGE_SIZE as the pseudo max_zone_append_size.
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*/
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if (bdev_is_zoned(bdev)) {
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zone_info->max_zone_append_size = min_t(u64,
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(u64)bdev_max_zone_append_sectors(bdev) << SECTOR_SHIFT,
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(u64)bdev_max_segments(bdev) << PAGE_SHIFT);
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} else {
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zone_info->max_zone_append_size =
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(u64)bdev_max_segments(bdev) << PAGE_SHIFT;
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}
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if (!IS_ALIGNED(nr_sectors, zone_sectors))
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zone_info->nr_zones++;
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|
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max_active_zones = bdev_max_active_zones(bdev);
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if (max_active_zones && max_active_zones < BTRFS_MIN_ACTIVE_ZONES) {
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btrfs_err_in_rcu(fs_info,
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"zoned: %s: max active zones %u is too small, need at least %u active zones",
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rcu_str_deref(device->name), max_active_zones,
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BTRFS_MIN_ACTIVE_ZONES);
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ret = -EINVAL;
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goto out;
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}
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zone_info->max_active_zones = max_active_zones;
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|
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zone_info->seq_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
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if (!zone_info->seq_zones) {
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ret = -ENOMEM;
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goto out;
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}
|
|
|
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zone_info->empty_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
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if (!zone_info->empty_zones) {
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ret = -ENOMEM;
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|
goto out;
|
|
}
|
|
|
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zone_info->active_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
|
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if (!zone_info->active_zones) {
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ret = -ENOMEM;
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goto out;
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}
|
|
|
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zones = kvcalloc(BTRFS_REPORT_NR_ZONES, sizeof(struct blk_zone), GFP_KERNEL);
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|
if (!zones) {
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|
ret = -ENOMEM;
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|
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 = vzalloc(sizeof(struct blk_zone) *
|
|
zone_info->nr_zones);
|
|
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);
|
|
}
|
|
|
|
/* 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 btrfs_device *device;
|
|
u64 zone_size = 0;
|
|
u64 max_zone_append_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);
|
|
|
|
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;
|
|
}
|
|
if (!max_zone_append_size ||
|
|
(zone_info->max_zone_append_size &&
|
|
zone_info->max_zone_append_size < max_zone_append_size))
|
|
max_zone_append_size = zone_info->max_zone_append_size;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
fs_info->max_zone_append_size = ALIGN_DOWN(max_zone_append_size,
|
|
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;
|
|
}
|
|
|
|
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) &&
|
|
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 = 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 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, 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)
|
|
{
|
|
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, u64 start)
|
|
{
|
|
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 (!is_data_inode(&inode->vfs_inode))
|
|
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 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->bdev = bio->bi_bdev;
|
|
|
|
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;
|
|
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(!bdev_is_partition(ordered->bdev));
|
|
if (WARN_ON(!ordered->bdev))
|
|
return;
|
|
|
|
if (WARN_ON(btrfs_rmap_block(fs_info, orig_logical, ordered->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);
|
|
}
|
|
|
|
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 = btrfs_lookup_block_group(fs_info, eb->start);
|
|
if (!cache)
|
|
return true;
|
|
|
|
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_io_context *bioc = 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, &bioc);
|
|
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);
|
|
}
|
|
|
|
struct btrfs_device *btrfs_zoned_get_device(struct btrfs_fs_info *fs_info,
|
|
u64 logical, u64 length)
|
|
{
|
|
struct btrfs_device *device;
|
|
struct extent_map *em;
|
|
struct map_lookup *map;
|
|
|
|
em = btrfs_get_chunk_map(fs_info, logical, length);
|
|
if (IS_ERR(em))
|
|
return ERR_CAST(em);
|
|
|
|
map = em->map_lookup;
|
|
/* We only support single profile for now */
|
|
device = map->stripes[0].dev;
|
|
|
|
free_extent_map(em);
|
|
|
|
return device;
|
|
}
|
|
|
|
/*
|
|
* 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 btrfs_space_info *space_info = block_group->space_info;
|
|
struct map_lookup *map;
|
|
struct btrfs_device *device;
|
|
u64 physical;
|
|
bool ret;
|
|
int i;
|
|
|
|
if (!btrfs_is_zoned(block_group->fs_info))
|
|
return true;
|
|
|
|
map = block_group->physical_map;
|
|
|
|
spin_lock(&space_info->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++) {
|
|
device = map->stripes[i].dev;
|
|
physical = map->stripes[i].physical;
|
|
|
|
if (device->zone_info->max_active_zones == 0)
|
|
continue;
|
|
|
|
if (!btrfs_dev_set_active_zone(device, physical)) {
|
|
/* Cannot activate the zone */
|
|
ret = false;
|
|
goto out_unlock;
|
|
}
|
|
}
|
|
|
|
/* Successfully activated all the zones */
|
|
set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &block_group->runtime_flags);
|
|
space_info->active_total_bytes += block_group->length;
|
|
spin_unlock(&block_group->lock);
|
|
btrfs_try_granting_tickets(fs_info, space_info);
|
|
spin_unlock(&space_info->lock);
|
|
|
|
/* For the active block group list */
|
|
btrfs_get_block_group(block_group);
|
|
|
|
spin_lock(&fs_info->zone_active_bgs_lock);
|
|
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(&space_info->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) {
|
|
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) {
|
|
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;
|
|
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;
|
|
|
|
if (device->zone_info->max_active_zones == 0)
|
|
continue;
|
|
|
|
ret = blkdev_zone_mgmt(device->bdev, REQ_OP_ZONE_FINISH,
|
|
physical >> SECTOR_SHIFT,
|
|
device->zone_info->zone_size >> SECTOR_SHIFT,
|
|
GFP_NOFS);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
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);
|
|
list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) {
|
|
struct btrfs_zoned_device_info *zinfo = device->zone_info;
|
|
|
|
if (!device->bdev)
|
|
continue;
|
|
|
|
if (!zinfo->max_active_zones ||
|
|
atomic_read(&zinfo->active_zones_left)) {
|
|
ret = true;
|
|
break;
|
|
}
|
|
}
|
|
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. */
|
|
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->flags & BTRFS_BLOCK_GROUP_SYSTEM)) {
|
|
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;
|
|
|
|
/* No more block groups to activate */
|
|
if (space_info->active_total_bytes == space_info->total_bytes)
|
|
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;
|
|
}
|