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linux/fs/btrfs/zoned.c
Naohiro Aota b1934cd606 btrfs: zoned: handle broken write pointer on zones 
Btrfs rejects to mount a FS if it finds a block group with a broken write
pointer (e.g, unequal write pointers on two zones of RAID1 block group).
Since such case can happen easily with a power-loss or crash of a system,
we need to handle the case more gently.

Handle such block group by making it unallocatable, so that there will be
no writes into it. That can be done by setting the allocation pointer at
the end of allocating region (= block_group->zone_capacity). Then, existing
code handle zone_unusable properly.

Having proper zone_capacity is necessary for the change. So, set it as fast
as possible.

We cannot handle RAID0 and RAID10 case like this. But, they are anyway
unable to read because of a missing stripe.

Fixes: 265f7237dd ("btrfs: zoned: allow DUP on meta-data block groups")
Fixes: 568220fa96 ("btrfs: zoned: support RAID0/1/10 on top of raid stripe tree")
CC: stable@vger.kernel.org # 6.1+
Reported-by: HAN Yuwei <hrx@bupt.moe>
Cc: Xuefer <xuefer@gmail.com>
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2024-09-02 23:39:34 +02:00

2663 lines
70 KiB
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// SPDX-License-Identifier: GPL-2.0
#include <linux/bitops.h>
#include <linux/slab.h>
#include <linux/blkdev.h>
#include <linux/sched/mm.h>
#include <linux/atomic.h>
#include <linux/vmalloc.h>
#include "ctree.h"
#include "volumes.h"
#include "zoned.h"
#include "rcu-string.h"
#include "disk-io.h"
#include "block-group.h"
#include "dev-replace.h"
#include "space-info.h"
#include "fs.h"
#include "accessors.h"
#include "bio.h"
/* Maximum number of zones to report per blkdev_report_zones() call */
#define BTRFS_REPORT_NR_ZONES 4096
/* Invalid allocation pointer value for missing devices */
#define WP_MISSING_DEV ((u64)-1)
/* Pseudo write pointer value for conventional zone */
#define WP_CONVENTIONAL ((u64)-2)
/*
* Location of the first zone of superblock logging zone pairs.
*
* - primary superblock: 0B (zone 0)
* - first copy: 512G (zone starting at that offset)
* - second copy: 4T (zone starting at that offset)
*/
#define BTRFS_SB_LOG_PRIMARY_OFFSET (0ULL)
#define BTRFS_SB_LOG_FIRST_OFFSET (512ULL * SZ_1G)
#define BTRFS_SB_LOG_SECOND_OFFSET (4096ULL * SZ_1G)
#define BTRFS_SB_LOG_FIRST_SHIFT const_ilog2(BTRFS_SB_LOG_FIRST_OFFSET)
#define BTRFS_SB_LOG_SECOND_SHIFT const_ilog2(BTRFS_SB_LOG_SECOND_OFFSET)
/* Number of superblock log zones */
#define BTRFS_NR_SB_LOG_ZONES 2
/*
* Minimum of active zones we need:
*
* - BTRFS_SUPER_MIRROR_MAX zones for superblock mirrors
* - 3 zones to ensure at least one zone per SYSTEM, META and DATA block group
* - 1 zone for tree-log dedicated block group
* - 1 zone for relocation
*/
#define BTRFS_MIN_ACTIVE_ZONES (BTRFS_SUPER_MIRROR_MAX + 5)
/*
* Minimum / maximum supported zone size. Currently, SMR disks have a zone
* size of 256MiB, and we are expecting ZNS drives to be in the 1-4GiB range.
* We do not expect the zone size to become larger than 8GiB or smaller than
* 4MiB in the near future.
*/
#define BTRFS_MAX_ZONE_SIZE SZ_8G
#define BTRFS_MIN_ZONE_SIZE SZ_4M
#define SUPER_INFO_SECTORS ((u64)BTRFS_SUPER_INFO_SIZE >> SECTOR_SHIFT)
static void wait_eb_writebacks(struct btrfs_block_group *block_group);
static int do_zone_finish(struct btrfs_block_group *block_group, bool fully_written);
static inline bool sb_zone_is_full(const struct blk_zone *zone)
{
return (zone->cond == BLK_ZONE_COND_FULL) ||
(zone->wp + SUPER_INFO_SECTORS > zone->start + zone->capacity);
}
static int copy_zone_info_cb(struct blk_zone *zone, unsigned int idx, void *data)
{
struct blk_zone *zones = data;
memcpy(&zones[idx], zone, sizeof(*zone));
return 0;
}
static int sb_write_pointer(struct block_device *bdev, struct blk_zone *zones,
u64 *wp_ret)
{
bool empty[BTRFS_NR_SB_LOG_ZONES];
bool full[BTRFS_NR_SB_LOG_ZONES];
sector_t sector;
for (int i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++) {
ASSERT(zones[i].type != BLK_ZONE_TYPE_CONVENTIONAL);
empty[i] = (zones[i].cond == BLK_ZONE_COND_EMPTY);
full[i] = sb_zone_is_full(&zones[i]);
}
/*
* Possible states of log buffer zones
*
* Empty[0] In use[0] Full[0]
* Empty[1] * 0 1
* In use[1] x x 1
* Full[1] 0 0 C
*
* Log position:
* *: Special case, no superblock is written
* 0: Use write pointer of zones[0]
* 1: Use write pointer of zones[1]
* C: Compare super blocks from zones[0] and zones[1], use the latest
* one determined by generation
* x: Invalid state
*/
if (empty[0] && empty[1]) {
/* Special case to distinguish no superblock to read */
*wp_ret = zones[0].start << SECTOR_SHIFT;
return -ENOENT;
} else if (full[0] && full[1]) {
/* Compare two super blocks */
struct address_space *mapping = bdev->bd_mapping;
struct page *page[BTRFS_NR_SB_LOG_ZONES];
struct btrfs_super_block *super[BTRFS_NR_SB_LOG_ZONES];
for (int i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++) {
u64 zone_end = (zones[i].start + zones[i].capacity) << SECTOR_SHIFT;
u64 bytenr = ALIGN_DOWN(zone_end, BTRFS_SUPER_INFO_SIZE) -
BTRFS_SUPER_INFO_SIZE;
page[i] = read_cache_page_gfp(mapping,
bytenr >> PAGE_SHIFT, GFP_NOFS);
if (IS_ERR(page[i])) {
if (i == 1)
btrfs_release_disk_super(super[0]);
return PTR_ERR(page[i]);
}
super[i] = page_address(page[i]);
}
if (btrfs_super_generation(super[0]) >
btrfs_super_generation(super[1]))
sector = zones[1].start;
else
sector = zones[0].start;
for (int i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++)
btrfs_release_disk_super(super[i]);
} else if (!full[0] && (empty[1] || full[1])) {
sector = zones[0].wp;
} else if (full[0]) {
sector = zones[1].wp;
} else {
return -EUCLEAN;
}
*wp_ret = sector << SECTOR_SHIFT;
return 0;
}
/*
* Get the first zone number of the superblock mirror
*/
static inline u32 sb_zone_number(int shift, int mirror)
{
u64 zone = U64_MAX;
ASSERT(mirror < BTRFS_SUPER_MIRROR_MAX);
switch (mirror) {
case 0: zone = 0; break;
case 1: zone = 1ULL << (BTRFS_SB_LOG_FIRST_SHIFT - shift); break;
case 2: zone = 1ULL << (BTRFS_SB_LOG_SECOND_SHIFT - shift); break;
}
ASSERT(zone <= U32_MAX);
return (u32)zone;
}
static inline sector_t zone_start_sector(u32 zone_number,
struct block_device *bdev)
{
return (sector_t)zone_number << ilog2(bdev_zone_sectors(bdev));
}
static inline u64 zone_start_physical(u32 zone_number,
struct btrfs_zoned_device_info *zone_info)
{
return (u64)zone_number << zone_info->zone_size_shift;
}
/*
* Emulate blkdev_report_zones() for a non-zoned device. It slices up the block
* device into static sized chunks and fake a conventional zone on each of
* them.
*/
static int emulate_report_zones(struct btrfs_device *device, u64 pos,
struct blk_zone *zones, unsigned int nr_zones)
{
const sector_t zone_sectors = device->fs_info->zone_size >> SECTOR_SHIFT;
sector_t bdev_size = bdev_nr_sectors(device->bdev);
unsigned int i;
pos >>= SECTOR_SHIFT;
for (i = 0; i < nr_zones; i++) {
zones[i].start = i * zone_sectors + pos;
zones[i].len = zone_sectors;
zones[i].capacity = zone_sectors;
zones[i].wp = zones[i].start + zone_sectors;
zones[i].type = BLK_ZONE_TYPE_CONVENTIONAL;
zones[i].cond = BLK_ZONE_COND_NOT_WP;
if (zones[i].wp >= bdev_size) {
i++;
break;
}
}
return i;
}
static int btrfs_get_dev_zones(struct btrfs_device *device, u64 pos,
struct blk_zone *zones, unsigned int *nr_zones)
{
struct btrfs_zoned_device_info *zinfo = device->zone_info;
int ret;
if (!*nr_zones)
return 0;
if (!bdev_is_zoned(device->bdev)) {
ret = emulate_report_zones(device, pos, zones, *nr_zones);
*nr_zones = ret;
return 0;
}
/* Check cache */
if (zinfo->zone_cache) {
unsigned int i;
u32 zno;
ASSERT(IS_ALIGNED(pos, zinfo->zone_size));
zno = pos >> zinfo->zone_size_shift;
/*
* We cannot report zones beyond the zone end. So, it is OK to
* cap *nr_zones to at the end.
*/
*nr_zones = min_t(u32, *nr_zones, zinfo->nr_zones - zno);
for (i = 0; i < *nr_zones; i++) {
struct blk_zone *zone_info;
zone_info = &zinfo->zone_cache[zno + i];
if (!zone_info->len)
break;
}
if (i == *nr_zones) {
/* Cache hit on all the zones */
memcpy(zones, zinfo->zone_cache + zno,
sizeof(*zinfo->zone_cache) * *nr_zones);
return 0;
}
}
ret = blkdev_report_zones(device->bdev, pos >> SECTOR_SHIFT, *nr_zones,
copy_zone_info_cb, zones);
if (ret < 0) {
btrfs_err_in_rcu(device->fs_info,
"zoned: failed to read zone %llu on %s (devid %llu)",
pos, rcu_str_deref(device->name),
device->devid);
return ret;
}
*nr_zones = ret;
if (!ret)
return -EIO;
/* Populate cache */
if (zinfo->zone_cache) {
u32 zno = pos >> zinfo->zone_size_shift;
memcpy(zinfo->zone_cache + zno, zones,
sizeof(*zinfo->zone_cache) * *nr_zones);
}
return 0;
}
/* The emulated zone size is determined from the size of device extent */
static int calculate_emulated_zone_size(struct btrfs_fs_info *fs_info)
{
struct btrfs_path *path;
struct btrfs_root *root = fs_info->dev_root;
struct btrfs_key key;
struct extent_buffer *leaf;
struct btrfs_dev_extent *dext;
int ret = 0;
key.objectid = 1;
key.type = BTRFS_DEV_EXTENT_KEY;
key.offset = 0;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
goto out;
if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
ret = btrfs_next_leaf(root, path);
if (ret < 0)
goto out;
/* No dev extents at all? Not good */
if (ret > 0) {
ret = -EUCLEAN;
goto out;
}
}
leaf = path->nodes[0];
dext = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_extent);
fs_info->zone_size = btrfs_dev_extent_length(leaf, dext);
ret = 0;
out:
btrfs_free_path(path);
return ret;
}
int btrfs_get_dev_zone_info_all_devices(struct btrfs_fs_info *fs_info)
{
struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
struct btrfs_device *device;
int ret = 0;
/* fs_info->zone_size might not set yet. Use the incomapt flag here. */
if (!btrfs_fs_incompat(fs_info, ZONED))
return 0;
mutex_lock(&fs_devices->device_list_mutex);
list_for_each_entry(device, &fs_devices->devices, dev_list) {
/* We can skip reading of zone info for missing devices */
if (!device->bdev)
continue;
ret = btrfs_get_dev_zone_info(device, true);
if (ret)
break;
}
mutex_unlock(&fs_devices->device_list_mutex);
return ret;
}
int btrfs_get_dev_zone_info(struct btrfs_device *device, bool populate_cache)
{
struct btrfs_fs_info *fs_info = device->fs_info;
struct btrfs_zoned_device_info *zone_info = NULL;
struct block_device *bdev = device->bdev;
unsigned int max_active_zones;
unsigned int nactive;
sector_t nr_sectors;
sector_t sector = 0;
struct blk_zone *zones = NULL;
unsigned int i, nreported = 0, nr_zones;
sector_t zone_sectors;
char *model, *emulated;
int ret;
/*
* Cannot use btrfs_is_zoned here, since fs_info::zone_size might not
* yet be set.
*/
if (!btrfs_fs_incompat(fs_info, ZONED))
return 0;
if (device->zone_info)
return 0;
zone_info = kzalloc(sizeof(*zone_info), GFP_KERNEL);
if (!zone_info)
return -ENOMEM;
device->zone_info = zone_info;
if (!bdev_is_zoned(bdev)) {
if (!fs_info->zone_size) {
ret = calculate_emulated_zone_size(fs_info);
if (ret)
goto out;
}
ASSERT(fs_info->zone_size);
zone_sectors = fs_info->zone_size >> SECTOR_SHIFT;
} else {
zone_sectors = bdev_zone_sectors(bdev);
}
ASSERT(is_power_of_two_u64(zone_sectors));
zone_info->zone_size = zone_sectors << SECTOR_SHIFT;
/* We reject devices with a zone size larger than 8GB */
if (zone_info->zone_size > BTRFS_MAX_ZONE_SIZE) {
btrfs_err_in_rcu(fs_info,
"zoned: %s: zone size %llu larger than supported maximum %llu",
rcu_str_deref(device->name),
zone_info->zone_size, BTRFS_MAX_ZONE_SIZE);
ret = -EINVAL;
goto out;
} else if (zone_info->zone_size < BTRFS_MIN_ZONE_SIZE) {
btrfs_err_in_rcu(fs_info,
"zoned: %s: zone size %llu smaller than supported minimum %u",
rcu_str_deref(device->name),
zone_info->zone_size, BTRFS_MIN_ZONE_SIZE);
ret = -EINVAL;
goto out;
}
nr_sectors = bdev_nr_sectors(bdev);
zone_info->zone_size_shift = ilog2(zone_info->zone_size);
zone_info->nr_zones = nr_sectors >> ilog2(zone_sectors);
if (!IS_ALIGNED(nr_sectors, zone_sectors))
zone_info->nr_zones++;
max_active_zones = bdev_max_active_zones(bdev);
if (max_active_zones && max_active_zones < BTRFS_MIN_ACTIVE_ZONES) {
btrfs_err_in_rcu(fs_info,
"zoned: %s: max active zones %u is too small, need at least %u active zones",
rcu_str_deref(device->name), max_active_zones,
BTRFS_MIN_ACTIVE_ZONES);
ret = -EINVAL;
goto out;
}
zone_info->max_active_zones = max_active_zones;
zone_info->seq_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
if (!zone_info->seq_zones) {
ret = -ENOMEM;
goto out;
}
zone_info->empty_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
if (!zone_info->empty_zones) {
ret = -ENOMEM;
goto out;
}
zone_info->active_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
if (!zone_info->active_zones) {
ret = -ENOMEM;
goto out;
}
zones = kvcalloc(BTRFS_REPORT_NR_ZONES, sizeof(struct blk_zone), GFP_KERNEL);
if (!zones) {
ret = -ENOMEM;
goto out;
}
/*
* Enable zone cache only for a zoned device. On a non-zoned device, we
* fill the zone info with emulated CONVENTIONAL zones, so no need to
* use the cache.
*/
if (populate_cache && bdev_is_zoned(device->bdev)) {
zone_info->zone_cache = vcalloc(zone_info->nr_zones,
sizeof(struct blk_zone));
if (!zone_info->zone_cache) {
btrfs_err_in_rcu(device->fs_info,
"zoned: failed to allocate zone cache for %s",
rcu_str_deref(device->name));
ret = -ENOMEM;
goto out;
}
}
/* Get zones type */
nactive = 0;
while (sector < nr_sectors) {
nr_zones = BTRFS_REPORT_NR_ZONES;
ret = btrfs_get_dev_zones(device, sector << SECTOR_SHIFT, zones,
&nr_zones);
if (ret)
goto out;
for (i = 0; i < nr_zones; i++) {
if (zones[i].type == BLK_ZONE_TYPE_SEQWRITE_REQ)
__set_bit(nreported, zone_info->seq_zones);
switch (zones[i].cond) {
case BLK_ZONE_COND_EMPTY:
__set_bit(nreported, zone_info->empty_zones);
break;
case BLK_ZONE_COND_IMP_OPEN:
case BLK_ZONE_COND_EXP_OPEN:
case BLK_ZONE_COND_CLOSED:
__set_bit(nreported, zone_info->active_zones);
nactive++;
break;
}
nreported++;
}
sector = zones[nr_zones - 1].start + zones[nr_zones - 1].len;
}
if (nreported != zone_info->nr_zones) {
btrfs_err_in_rcu(device->fs_info,
"inconsistent number of zones on %s (%u/%u)",
rcu_str_deref(device->name), nreported,
zone_info->nr_zones);
ret = -EIO;
goto out;
}
if (max_active_zones) {
if (nactive > max_active_zones) {
btrfs_err_in_rcu(device->fs_info,
"zoned: %u active zones on %s exceeds max_active_zones %u",
nactive, rcu_str_deref(device->name),
max_active_zones);
ret = -EIO;
goto out;
}
atomic_set(&zone_info->active_zones_left,
max_active_zones - nactive);
set_bit(BTRFS_FS_ACTIVE_ZONE_TRACKING, &fs_info->flags);
}
/* Validate superblock log */
nr_zones = BTRFS_NR_SB_LOG_ZONES;
for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
u32 sb_zone;
u64 sb_wp;
int sb_pos = BTRFS_NR_SB_LOG_ZONES * i;
sb_zone = sb_zone_number(zone_info->zone_size_shift, i);
if (sb_zone + 1 >= zone_info->nr_zones)
continue;
ret = btrfs_get_dev_zones(device,
zone_start_physical(sb_zone, zone_info),
&zone_info->sb_zones[sb_pos],
&nr_zones);
if (ret)
goto out;
if (nr_zones != BTRFS_NR_SB_LOG_ZONES) {
btrfs_err_in_rcu(device->fs_info,
"zoned: failed to read super block log zone info at devid %llu zone %u",
device->devid, sb_zone);
ret = -EUCLEAN;
goto out;
}
/*
* If zones[0] is conventional, always use the beginning of the
* zone to record superblock. No need to validate in that case.
*/
if (zone_info->sb_zones[BTRFS_NR_SB_LOG_ZONES * i].type ==
BLK_ZONE_TYPE_CONVENTIONAL)
continue;
ret = sb_write_pointer(device->bdev,
&zone_info->sb_zones[sb_pos], &sb_wp);
if (ret != -ENOENT && ret) {
btrfs_err_in_rcu(device->fs_info,
"zoned: super block log zone corrupted devid %llu zone %u",
device->devid, sb_zone);
ret = -EUCLEAN;
goto out;
}
}
kvfree(zones);
if (bdev_is_zoned(bdev)) {
model = "host-managed zoned";
emulated = "";
} else {
model = "regular";
emulated = "emulated ";
}
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);
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;
}
static 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_is_zoned(device->bdev)) {
btrfs_err(fs_info,
"zoned: mode not enabled but zoned device found: %pg",
device->bdev);
return -EINVAL;
}
}
return 0;
}
int btrfs_check_zoned_mode(struct btrfs_fs_info *fs_info)
{
struct queue_limits *lim = &fs_info->limits;
struct btrfs_device *device;
u64 zone_size = 0;
int ret;
/*
* Host-Managed devices can't be used without the ZONED flag. With the
* ZONED all devices can be used, using zone emulation if required.
*/
if (!btrfs_fs_incompat(fs_info, ZONED))
return btrfs_check_for_zoned_device(fs_info);
blk_set_stacking_limits(lim);
list_for_each_entry(device, &fs_info->fs_devices->devices, dev_list) {
struct btrfs_zoned_device_info *zone_info = device->zone_info;
if (!device->bdev)
continue;
if (!zone_size) {
zone_size = zone_info->zone_size;
} else if (zone_info->zone_size != zone_size) {
btrfs_err(fs_info,
"zoned: unequal block device zone sizes: have %llu found %llu",
zone_info->zone_size, zone_size);
return -EINVAL;
}
/*
* With the zoned emulation, we can have non-zoned device on the
* zoned mode. In this case, we don't have a valid max zone
* append size.
*/
if (bdev_is_zoned(device->bdev)) {
blk_stack_limits(lim,
&bdev_get_queue(device->bdev)->limits,
0);
}
}
/*
* stripe_size is always aligned to BTRFS_STRIPE_LEN in
* btrfs_create_chunk(). Since we want stripe_len == zone_size,
* check the alignment here.
*/
if (!IS_ALIGNED(zone_size, BTRFS_STRIPE_LEN)) {
btrfs_err(fs_info,
"zoned: zone size %llu not aligned to stripe %u",
zone_size, BTRFS_STRIPE_LEN);
return -EINVAL;
}
if (btrfs_fs_incompat(fs_info, MIXED_GROUPS)) {
btrfs_err(fs_info, "zoned: mixed block groups not supported");
return -EINVAL;
}
fs_info->zone_size = zone_size;
/*
* Also limit max_zone_append_size by max_segments * PAGE_SIZE.
* Technically, we can have multiple pages per segment. But, since
* we add the pages one by one to a bio, and cannot increase the
* metadata reservation even if it increases the number of extents, it
* is safe to stick with the limit.
*/
fs_info->max_zone_append_size = ALIGN_DOWN(
min3((u64)lim->max_zone_append_sectors << SECTOR_SHIFT,
(u64)lim->max_sectors << SECTOR_SHIFT,
(u64)lim->max_segments << PAGE_SHIFT),
fs_info->sectorsize);
fs_info->fs_devices->chunk_alloc_policy = BTRFS_CHUNK_ALLOC_ZONED;
if (fs_info->max_zone_append_size < fs_info->max_extent_size)
fs_info->max_extent_size = fs_info->max_zone_append_size;
/*
* Check mount options here, because we might change fs_info->zoned
* from fs_info->zone_size.
*/
ret = btrfs_check_mountopts_zoned(fs_info, &fs_info->mount_opt);
if (ret)
return ret;
btrfs_info(fs_info, "zoned mode enabled with zone size %llu", zone_size);
return 0;
}
int btrfs_check_mountopts_zoned(const struct btrfs_fs_info *info,
unsigned long long *mount_opt)
{
if (!btrfs_is_zoned(info))
return 0;
/*
* Space cache writing is not COWed. Disable that to avoid write errors
* in sequential zones.
*/
if (btrfs_raw_test_opt(*mount_opt, SPACE_CACHE)) {
btrfs_err(info, "zoned: space cache v1 is not supported");
return -EINVAL;
}
if (btrfs_raw_test_opt(*mount_opt, NODATACOW)) {
btrfs_err(info, "zoned: NODATACOW not supported");
return -EINVAL;
}
if (btrfs_raw_test_opt(*mount_opt, DISCARD_ASYNC)) {
btrfs_info(info,
"zoned: async discard ignored and disabled for zoned mode");
btrfs_clear_opt(*mount_opt, DISCARD_ASYNC);
}
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) {
unsigned int nofs_flags;
ASSERT(sb_zone_is_full(reset));
nofs_flags = memalloc_nofs_save();
ret = blkdev_zone_mgmt(bdev, REQ_OP_ZONE_RESET,
reset->start, reset->len);
memalloc_nofs_restore(nofs_flags);
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) {
unsigned int nofs_flags;
int ret;
nofs_flags = memalloc_nofs_save();
ret = blkdev_zone_mgmt(device->bdev,
REQ_OP_ZONE_FINISH, zone->start,
zone->len);
memalloc_nofs_restore(nofs_flags);
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)
{
unsigned int nofs_flags;
sector_t zone_sectors;
sector_t nr_sectors;
u8 zone_sectors_shift;
u32 sb_zone;
u32 nr_zones;
int ret;
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;
nofs_flags = memalloc_nofs_save();
ret = blkdev_zone_mgmt(bdev, REQ_OP_ZONE_RESET,
zone_start_sector(sb_zone, bdev),
zone_sectors * BTRFS_NR_SB_LOG_ZONES);
memalloc_nofs_restore(nofs_flags);
return ret;
}
/*
* Find allocatable zones within a given region.
*
* @device: the device to allocate a region on
* @hole_start: the position of the hole to allocate the region
* @num_bytes: size of wanted region
* @hole_end: the end of the hole
* @return: position of allocatable zones
*
* Allocatable region should not contain any superblock locations.
*/
u64 btrfs_find_allocatable_zones(struct btrfs_device *device, u64 hole_start,
u64 hole_end, u64 num_bytes)
{
struct btrfs_zoned_device_info *zinfo = device->zone_info;
const u8 shift = zinfo->zone_size_shift;
u64 nzones = num_bytes >> shift;
u64 pos = hole_start;
u64 begin, end;
bool have_sb;
int i;
ASSERT(IS_ALIGNED(hole_start, zinfo->zone_size));
ASSERT(IS_ALIGNED(num_bytes, zinfo->zone_size));
while (pos < hole_end) {
begin = pos >> shift;
end = begin + nzones;
if (end > zinfo->nr_zones)
return hole_end;
/* Check if zones in the region are all empty */
if (btrfs_dev_is_sequential(device, pos) &&
!bitmap_test_range_all_set(zinfo->empty_zones, begin, nzones)) {
pos += zinfo->zone_size;
continue;
}
have_sb = false;
for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
u32 sb_zone;
u64 sb_pos;
sb_zone = sb_zone_number(shift, i);
if (!(end <= sb_zone ||
sb_zone + BTRFS_NR_SB_LOG_ZONES <= begin)) {
have_sb = true;
pos = zone_start_physical(
sb_zone + BTRFS_NR_SB_LOG_ZONES, zinfo);
break;
}
/* We also need to exclude regular superblock positions */
sb_pos = btrfs_sb_offset(i);
if (!(pos + num_bytes <= sb_pos ||
sb_pos + BTRFS_SUPER_INFO_SIZE <= pos)) {
have_sb = true;
pos = ALIGN(sb_pos + BTRFS_SUPER_INFO_SIZE,
zinfo->zone_size);
break;
}
}
if (!have_sb)
break;
}
return pos;
}
static bool btrfs_dev_set_active_zone(struct btrfs_device *device, u64 pos)
{
struct btrfs_zoned_device_info *zone_info = device->zone_info;
unsigned int zno = (pos >> zone_info->zone_size_shift);
/* We can use any number of zones */
if (zone_info->max_active_zones == 0)
return true;
if (!test_bit(zno, zone_info->active_zones)) {
/* Active zone left? */
if (atomic_dec_if_positive(&zone_info->active_zones_left) < 0)
return false;
if (test_and_set_bit(zno, zone_info->active_zones)) {
/* Someone already set the bit */
atomic_inc(&zone_info->active_zones_left);
}
}
return true;
}
static void btrfs_dev_clear_active_zone(struct btrfs_device *device, u64 pos)
{
struct btrfs_zoned_device_info *zone_info = device->zone_info;
unsigned int zno = (pos >> zone_info->zone_size_shift);
/* We can use any number of zones */
if (zone_info->max_active_zones == 0)
return;
if (test_and_clear_bit(zno, zone_info->active_zones))
atomic_inc(&zone_info->active_zones_left);
}
int btrfs_reset_device_zone(struct btrfs_device *device, u64 physical,
u64 length, u64 *bytes)
{
unsigned int nofs_flags;
int ret;
*bytes = 0;
nofs_flags = memalloc_nofs_save();
ret = blkdev_zone_mgmt(device->bdev, REQ_OP_ZONE_RESET,
physical >> SECTOR_SHIFT, length >> SECTOR_SHIFT);
memalloc_nofs_restore(nofs_flags);
if (ret)
return ret;
*bytes = length;
while (length) {
btrfs_dev_set_zone_empty(device, physical);
btrfs_dev_clear_active_zone(device, physical);
physical += device->zone_info->zone_size;
length -= device->zone_info->zone_size;
}
return 0;
}
int btrfs_ensure_empty_zones(struct btrfs_device *device, u64 start, u64 size)
{
struct btrfs_zoned_device_info *zinfo = device->zone_info;
const u8 shift = zinfo->zone_size_shift;
unsigned long begin = start >> shift;
unsigned long nbits = size >> shift;
u64 pos;
int ret;
ASSERT(IS_ALIGNED(start, zinfo->zone_size));
ASSERT(IS_ALIGNED(size, zinfo->zone_size));
if (begin + nbits > zinfo->nr_zones)
return -ERANGE;
/* All the zones are conventional */
if (bitmap_test_range_all_zero(zinfo->seq_zones, begin, nbits))
return 0;
/* All the zones are sequential and empty */
if (bitmap_test_range_all_set(zinfo->seq_zones, begin, nbits) &&
bitmap_test_range_all_set(zinfo->empty_zones, begin, nbits))
return 0;
for (pos = start; pos < start + size; pos += zinfo->zone_size) {
u64 reset_bytes;
if (!btrfs_dev_is_sequential(device, pos) ||
btrfs_dev_is_empty_zone(device, pos))
continue;
/* Free regions should be empty */
btrfs_warn_in_rcu(
device->fs_info,
"zoned: resetting device %s (devid %llu) zone %llu for allocation",
rcu_str_deref(device->name), device->devid, pos >> shift);
WARN_ON_ONCE(1);
ret = btrfs_reset_device_zone(device, pos, zinfo->zone_size,
&reset_bytes);
if (ret)
return ret;
}
return 0;
}
/*
* Calculate an allocation pointer from the extent allocation information
* for a block group consist of conventional zones. It is pointed to the
* end of the highest addressed extent in the block group as an allocation
* offset.
*/
static int calculate_alloc_pointer(struct btrfs_block_group *cache,
u64 *offset_ret, bool new)
{
struct btrfs_fs_info *fs_info = cache->fs_info;
struct btrfs_root *root;
struct btrfs_path *path;
struct btrfs_key key;
struct btrfs_key found_key;
int ret;
u64 length;
/*
* Avoid tree lookups for a new block group, there's no use for it.
* It must always be 0.
*
* Also, we have a lock chain of extent buffer lock -> chunk mutex.
* For new a block group, this function is called from
* btrfs_make_block_group() which is already taking the chunk mutex.
* Thus, we cannot call calculate_alloc_pointer() which takes extent
* buffer locks to avoid deadlock.
*/
if (new) {
*offset_ret = 0;
return 0;
}
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
key.objectid = cache->start + cache->length;
key.type = 0;
key.offset = 0;
root = btrfs_extent_root(fs_info, key.objectid);
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
/* We should not find the exact match */
if (!ret)
ret = -EUCLEAN;
if (ret < 0)
goto out;
ret = btrfs_previous_extent_item(root, path, cache->start);
if (ret) {
if (ret == 1) {
ret = 0;
*offset_ret = 0;
}
goto out;
}
btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]);
if (found_key.type == BTRFS_EXTENT_ITEM_KEY)
length = found_key.offset;
else
length = fs_info->nodesize;
if (!(found_key.objectid >= cache->start &&
found_key.objectid + length <= cache->start + cache->length)) {
ret = -EUCLEAN;
goto out;
}
*offset_ret = found_key.objectid + length - cache->start;
ret = 0;
out:
btrfs_free_path(path);
return ret;
}
struct zone_info {
u64 physical;
u64 capacity;
u64 alloc_offset;
};
static int btrfs_load_zone_info(struct btrfs_fs_info *fs_info, int zone_idx,
struct zone_info *info, unsigned long *active,
struct btrfs_chunk_map *map)
{
struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
struct btrfs_device *device;
int dev_replace_is_ongoing = 0;
unsigned int nofs_flag;
struct blk_zone zone;
int ret;
info->physical = map->stripes[zone_idx].physical;
down_read(&dev_replace->rwsem);
device = map->stripes[zone_idx].dev;
if (!device->bdev) {
up_read(&dev_replace->rwsem);
info->alloc_offset = WP_MISSING_DEV;
return 0;
}
/* Consider a zone as active if we can allow any number of active zones. */
if (!device->zone_info->max_active_zones)
__set_bit(zone_idx, active);
if (!btrfs_dev_is_sequential(device, info->physical)) {
up_read(&dev_replace->rwsem);
info->alloc_offset = WP_CONVENTIONAL;
return 0;
}
/* This zone will be used for allocation, so mark this zone non-empty. */
btrfs_dev_clear_zone_empty(device, info->physical);
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, info->physical);
/*
* 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(info->physical, fs_info->zone_size));
nofs_flag = memalloc_nofs_save();
ret = btrfs_get_dev_zone(device, info->physical, &zone);
memalloc_nofs_restore(nofs_flag);
if (ret) {
up_read(&dev_replace->rwsem);
if (ret != -EIO && ret != -EOPNOTSUPP)
return ret;
info->alloc_offset = WP_MISSING_DEV;
return 0;
}
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);
up_read(&dev_replace->rwsem);
return -EIO;
}
info->capacity = (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)",
(info->physical >> device->zone_info->zone_size_shift),
rcu_str_deref(device->name), device->devid);
info->alloc_offset = WP_MISSING_DEV;
break;
case BLK_ZONE_COND_EMPTY:
info->alloc_offset = 0;
break;
case BLK_ZONE_COND_FULL:
info->alloc_offset = info->capacity;
break;
default:
/* Partially used zone. */
info->alloc_offset = ((zone.wp - zone.start) << SECTOR_SHIFT);
__set_bit(zone_idx, active);
break;
}
up_read(&dev_replace->rwsem);
return 0;
}
static int btrfs_load_block_group_single(struct btrfs_block_group *bg,
struct zone_info *info,
unsigned long *active)
{
if (info->alloc_offset == WP_MISSING_DEV) {
btrfs_err(bg->fs_info,
"zoned: cannot recover write pointer for zone %llu",
info->physical);
return -EIO;
}
bg->alloc_offset = info->alloc_offset;
bg->zone_capacity = info->capacity;
if (test_bit(0, active))
set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &bg->runtime_flags);
return 0;
}
static int btrfs_load_block_group_dup(struct btrfs_block_group *bg,
struct btrfs_chunk_map *map,
struct zone_info *zone_info,
unsigned long *active)
{
struct btrfs_fs_info *fs_info = bg->fs_info;
if ((map->type & BTRFS_BLOCK_GROUP_DATA) && !fs_info->stripe_root) {
btrfs_err(fs_info, "zoned: data DUP profile needs raid-stripe-tree");
return -EINVAL;
}
bg->zone_capacity = min_not_zero(zone_info[0].capacity, zone_info[1].capacity);
if (zone_info[0].alloc_offset == WP_MISSING_DEV) {
btrfs_err(bg->fs_info,
"zoned: cannot recover write pointer for zone %llu",
zone_info[0].physical);
return -EIO;
}
if (zone_info[1].alloc_offset == WP_MISSING_DEV) {
btrfs_err(bg->fs_info,
"zoned: cannot recover write pointer for zone %llu",
zone_info[1].physical);
return -EIO;
}
if (zone_info[0].alloc_offset != zone_info[1].alloc_offset) {
btrfs_err(bg->fs_info,
"zoned: write pointer offset mismatch of zones in DUP profile");
return -EIO;
}
if (test_bit(0, active) != test_bit(1, active)) {
if (!btrfs_zone_activate(bg))
return -EIO;
} else if (test_bit(0, active)) {
set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &bg->runtime_flags);
}
bg->alloc_offset = zone_info[0].alloc_offset;
return 0;
}
static int btrfs_load_block_group_raid1(struct btrfs_block_group *bg,
struct btrfs_chunk_map *map,
struct zone_info *zone_info,
unsigned long *active)
{
struct btrfs_fs_info *fs_info = bg->fs_info;
int i;
if ((map->type & BTRFS_BLOCK_GROUP_DATA) && !fs_info->stripe_root) {
btrfs_err(fs_info, "zoned: data %s needs raid-stripe-tree",
btrfs_bg_type_to_raid_name(map->type));
return -EINVAL;
}
/* In case a device is missing we have a cap of 0, so don't use it. */
bg->zone_capacity = min_not_zero(zone_info[0].capacity, zone_info[1].capacity);
for (i = 0; i < map->num_stripes; i++) {
if (zone_info[i].alloc_offset == WP_MISSING_DEV ||
zone_info[i].alloc_offset == WP_CONVENTIONAL)
continue;
if ((zone_info[0].alloc_offset != zone_info[i].alloc_offset) &&
!btrfs_test_opt(fs_info, DEGRADED)) {
btrfs_err(fs_info,
"zoned: write pointer offset mismatch of zones in %s profile",
btrfs_bg_type_to_raid_name(map->type));
return -EIO;
}
if (test_bit(0, active) != test_bit(i, active)) {
if (!btrfs_test_opt(fs_info, DEGRADED) &&
!btrfs_zone_activate(bg)) {
return -EIO;
}
} else {
if (test_bit(0, active))
set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &bg->runtime_flags);
}
}
if (zone_info[0].alloc_offset != WP_MISSING_DEV)
bg->alloc_offset = zone_info[0].alloc_offset;
else
bg->alloc_offset = zone_info[i - 1].alloc_offset;
return 0;
}
static int btrfs_load_block_group_raid0(struct btrfs_block_group *bg,
struct btrfs_chunk_map *map,
struct zone_info *zone_info,
unsigned long *active)
{
struct btrfs_fs_info *fs_info = bg->fs_info;
if ((map->type & BTRFS_BLOCK_GROUP_DATA) && !fs_info->stripe_root) {
btrfs_err(fs_info, "zoned: data %s needs raid-stripe-tree",
btrfs_bg_type_to_raid_name(map->type));
return -EINVAL;
}
for (int i = 0; i < map->num_stripes; i++) {
if (zone_info[i].alloc_offset == WP_MISSING_DEV ||
zone_info[i].alloc_offset == WP_CONVENTIONAL)
continue;
if (test_bit(0, active) != test_bit(i, active)) {
if (!btrfs_zone_activate(bg))
return -EIO;
} else {
if (test_bit(0, active))
set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &bg->runtime_flags);
}
bg->zone_capacity += zone_info[i].capacity;
bg->alloc_offset += zone_info[i].alloc_offset;
}
return 0;
}
static int btrfs_load_block_group_raid10(struct btrfs_block_group *bg,
struct btrfs_chunk_map *map,
struct zone_info *zone_info,
unsigned long *active)
{
struct btrfs_fs_info *fs_info = bg->fs_info;
if ((map->type & BTRFS_BLOCK_GROUP_DATA) && !fs_info->stripe_root) {
btrfs_err(fs_info, "zoned: data %s needs raid-stripe-tree",
btrfs_bg_type_to_raid_name(map->type));
return -EINVAL;
}
for (int i = 0; i < map->num_stripes; i++) {
if (zone_info[i].alloc_offset == WP_MISSING_DEV ||
zone_info[i].alloc_offset == WP_CONVENTIONAL)
continue;
if (test_bit(0, active) != test_bit(i, active)) {
if (!btrfs_zone_activate(bg))
return -EIO;
} else {
if (test_bit(0, active))
set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &bg->runtime_flags);
}
if ((i % map->sub_stripes) == 0) {
bg->zone_capacity += zone_info[i].capacity;
bg->alloc_offset += zone_info[i].alloc_offset;
}
}
return 0;
}
int btrfs_load_block_group_zone_info(struct btrfs_block_group *cache, bool new)
{
struct btrfs_fs_info *fs_info = cache->fs_info;
struct btrfs_chunk_map *map;
u64 logical = cache->start;
u64 length = cache->length;
struct zone_info *zone_info = NULL;
int ret;
int i;
unsigned long *active = NULL;
u64 last_alloc = 0;
u32 num_sequential = 0, num_conventional = 0;
u64 profile;
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;
}
map = btrfs_find_chunk_map(fs_info, logical, length);
if (!map)
return -EINVAL;
cache->physical_map = map;
zone_info = kcalloc(map->num_stripes, sizeof(*zone_info), GFP_NOFS);
if (!zone_info) {
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++) {
ret = btrfs_load_zone_info(fs_info, i, &zone_info[i], active, map);
if (ret)
goto out;
if (zone_info[i].alloc_offset == WP_CONVENTIONAL)
num_conventional++;
else
num_sequential++;
}
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;
}
}
profile = map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK;
switch (profile) {
case 0: /* single */
ret = btrfs_load_block_group_single(cache, &zone_info[0], active);
break;
case BTRFS_BLOCK_GROUP_DUP:
ret = btrfs_load_block_group_dup(cache, map, zone_info, active);
break;
case BTRFS_BLOCK_GROUP_RAID1:
case BTRFS_BLOCK_GROUP_RAID1C3:
case BTRFS_BLOCK_GROUP_RAID1C4:
ret = btrfs_load_block_group_raid1(cache, map, zone_info, active);
break;
case BTRFS_BLOCK_GROUP_RAID0:
ret = btrfs_load_block_group_raid0(cache, map, zone_info, active);
break;
case BTRFS_BLOCK_GROUP_RAID10:
ret = btrfs_load_block_group_raid10(cache, map, zone_info, active);
break;
case BTRFS_BLOCK_GROUP_RAID5:
case BTRFS_BLOCK_GROUP_RAID6:
default:
btrfs_err(fs_info, "zoned: profile %s not yet supported",
btrfs_bg_type_to_raid_name(map->type));
ret = -EINVAL;
goto out;
}
if (ret == -EIO && profile != 0 && profile != BTRFS_BLOCK_GROUP_RAID0 &&
profile != BTRFS_BLOCK_GROUP_RAID10) {
/*
* Detected broken write pointer. Make this block group
* unallocatable by setting the allocation pointer at the end of
* allocatable region. Relocating this block group will fix the
* mismatch.
*
* Currently, we cannot handle RAID0 or RAID10 case like this
* because we don't have a proper zone_capacity value. But,
* reading from this block group won't work anyway by a missing
* stripe.
*/
cache->alloc_offset = cache->zone_capacity;
ret = 0;
}
out:
/* Reject non SINGLE data profiles without RST */
if ((map->type & BTRFS_BLOCK_GROUP_DATA) &&
(map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK) &&
!fs_info->stripe_root) {
btrfs_err(fs_info, "zoned: data %s needs raid-stripe-tree",
btrfs_bg_type_to_raid_name(map->type));
return -EINVAL;
}
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 {
btrfs_free_chunk_map(cache->physical_map);
cache->physical_map = NULL;
}
bitmap_free(active);
kfree(zone_info);
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;
}
bool btrfs_use_zone_append(struct btrfs_bio *bbio)
{
u64 start = (bbio->bio.bi_iter.bi_sector << SECTOR_SHIFT);
struct btrfs_inode *inode = bbio->inode;
struct btrfs_fs_info *fs_info = bbio->fs_info;
struct btrfs_block_group *cache;
bool ret = false;
if (!btrfs_is_zoned(fs_info))
return false;
if (!inode || !is_data_inode(inode))
return false;
if (btrfs_op(&bbio->bio) != BTRFS_MAP_WRITE)
return false;
/*
* Using REQ_OP_ZONE_APPNED for relocation can break assumptions on the
* extent layout the relocation code has.
* Furthermore we have set aside own block-group from which only the
* relocation "process" can allocate and make sure only one process at a
* time can add pages to an extent that gets relocated, so it's safe to
* use regular REQ_OP_WRITE for this special case.
*/
if (btrfs_is_data_reloc_root(inode->root))
return false;
cache = btrfs_lookup_block_group(fs_info, start);
ASSERT(cache);
if (!cache)
return false;
ret = !!test_bit(BLOCK_GROUP_FLAG_SEQUENTIAL_ZONE, &cache->runtime_flags);
btrfs_put_block_group(cache);
return ret;
}
void btrfs_record_physical_zoned(struct btrfs_bio *bbio)
{
const u64 physical = bbio->bio.bi_iter.bi_sector << SECTOR_SHIFT;
struct btrfs_ordered_sum *sum = bbio->sums;
if (physical < bbio->orig_physical)
sum->logical -= bbio->orig_physical - physical;
else
sum->logical += physical - bbio->orig_physical;
}
static void btrfs_rewrite_logical_zoned(struct btrfs_ordered_extent *ordered,
u64 logical)
{
struct extent_map_tree *em_tree = &ordered->inode->extent_tree;
struct extent_map *em;
ordered->disk_bytenr = logical;
write_lock(&em_tree->lock);
em = search_extent_mapping(em_tree, ordered->file_offset,
ordered->num_bytes);
/* The em should be a new COW extent, thus it should not have an offset. */
ASSERT(em->offset == 0);
em->disk_bytenr = logical;
free_extent_map(em);
write_unlock(&em_tree->lock);
}
static bool btrfs_zoned_split_ordered(struct btrfs_ordered_extent *ordered,
u64 logical, u64 len)
{
struct btrfs_ordered_extent *new;
if (!test_bit(BTRFS_ORDERED_NOCOW, &ordered->flags) &&
split_extent_map(ordered->inode, ordered->file_offset,
ordered->num_bytes, len, logical))
return false;
new = btrfs_split_ordered_extent(ordered, len);
if (IS_ERR(new))
return false;
new->disk_bytenr = logical;
btrfs_finish_one_ordered(new);
return true;
}
void btrfs_finish_ordered_zoned(struct btrfs_ordered_extent *ordered)
{
struct btrfs_inode *inode = ordered->inode;
struct btrfs_fs_info *fs_info = inode->root->fs_info;
struct btrfs_ordered_sum *sum;
u64 logical, len;
/*
* Write to pre-allocated region is for the data relocation, and so
* it should use WRITE operation. No split/rewrite are necessary.
*/
if (test_bit(BTRFS_ORDERED_PREALLOC, &ordered->flags))
return;
ASSERT(!list_empty(&ordered->list));
/* The ordered->list can be empty in the above pre-alloc case. */
sum = list_first_entry(&ordered->list, struct btrfs_ordered_sum, list);
logical = sum->logical;
len = sum->len;
while (len < ordered->disk_num_bytes) {
sum = list_next_entry(sum, list);
if (sum->logical == logical + len) {
len += sum->len;
continue;
}
if (!btrfs_zoned_split_ordered(ordered, logical, len)) {
set_bit(BTRFS_ORDERED_IOERR, &ordered->flags);
btrfs_err(fs_info, "failed to split ordered extent");
goto out;
}
logical = sum->logical;
len = sum->len;
}
if (ordered->disk_bytenr != logical)
btrfs_rewrite_logical_zoned(ordered, logical);
out:
/*
* If we end up here for nodatasum I/O, the btrfs_ordered_sum structures
* were allocated by btrfs_alloc_dummy_sum only to record the logical
* addresses and don't contain actual checksums. We thus must free them
* here so that we don't attempt to log the csums later.
*/
if ((inode->flags & BTRFS_INODE_NODATASUM) ||
test_bit(BTRFS_FS_STATE_NO_DATA_CSUMS, &fs_info->fs_state)) {
while ((sum = list_first_entry_or_null(&ordered->list,
typeof(*sum), list))) {
list_del(&sum->list);
kfree(sum);
}
}
}
static bool check_bg_is_active(struct btrfs_eb_write_context *ctx,
struct btrfs_block_group **active_bg)
{
const struct writeback_control *wbc = ctx->wbc;
struct btrfs_block_group *block_group = ctx->zoned_bg;
struct btrfs_fs_info *fs_info = block_group->fs_info;
if (test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &block_group->runtime_flags))
return true;
if (fs_info->treelog_bg == block_group->start) {
if (!btrfs_zone_activate(block_group)) {
int ret_fin = btrfs_zone_finish_one_bg(fs_info);
if (ret_fin != 1 || !btrfs_zone_activate(block_group))
return false;
}
} else if (*active_bg != block_group) {
struct btrfs_block_group *tgt = *active_bg;
/* zoned_meta_io_lock protects fs_info->active_{meta,system}_bg. */
lockdep_assert_held(&fs_info->zoned_meta_io_lock);
if (tgt) {
/*
* If there is an unsent IO left in the allocated area,
* we cannot wait for them as it may cause a deadlock.
*/
if (tgt->meta_write_pointer < tgt->start + tgt->alloc_offset) {
if (wbc->sync_mode == WB_SYNC_NONE ||
(wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync))
return false;
}
/* Pivot active metadata/system block group. */
btrfs_zoned_meta_io_unlock(fs_info);
wait_eb_writebacks(tgt);
do_zone_finish(tgt, true);
btrfs_zoned_meta_io_lock(fs_info);
if (*active_bg == tgt) {
btrfs_put_block_group(tgt);
*active_bg = NULL;
}
}
if (!btrfs_zone_activate(block_group))
return false;
if (*active_bg != block_group) {
ASSERT(*active_bg == NULL);
*active_bg = block_group;
btrfs_get_block_group(block_group);
}
}
return true;
}
/*
* Check if @ctx->eb is aligned to the write pointer.
*
* Return:
* 0: @ctx->eb is at the write pointer. You can write it.
* -EAGAIN: There is a hole. The caller should handle the case.
* -EBUSY: There is a hole, but the caller can just bail out.
*/
int btrfs_check_meta_write_pointer(struct btrfs_fs_info *fs_info,
struct btrfs_eb_write_context *ctx)
{
const struct writeback_control *wbc = ctx->wbc;
const struct extent_buffer *eb = ctx->eb;
struct btrfs_block_group *block_group = ctx->zoned_bg;
if (!btrfs_is_zoned(fs_info))
return 0;
if (block_group) {
if (block_group->start > eb->start ||
block_group->start + block_group->length <= eb->start) {
btrfs_put_block_group(block_group);
block_group = NULL;
ctx->zoned_bg = NULL;
}
}
if (!block_group) {
block_group = btrfs_lookup_block_group(fs_info, eb->start);
if (!block_group)
return 0;
ctx->zoned_bg = block_group;
}
if (block_group->meta_write_pointer == eb->start) {
struct btrfs_block_group **tgt;
if (!test_bit(BTRFS_FS_ACTIVE_ZONE_TRACKING, &fs_info->flags))
return 0;
if (block_group->flags & BTRFS_BLOCK_GROUP_SYSTEM)
tgt = &fs_info->active_system_bg;
else
tgt = &fs_info->active_meta_bg;
if (check_bg_is_active(ctx, tgt))
return 0;
}
/*
* Since we may release fs_info->zoned_meta_io_lock, someone can already
* start writing this eb. In that case, we can just bail out.
*/
if (block_group->meta_write_pointer > eb->start)
return -EBUSY;
/* If for_sync, this hole will be filled with trasnsaction commit. */
if (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync)
return -EAGAIN;
return -EBUSY;
}
int btrfs_zoned_issue_zeroout(struct btrfs_device *device, u64 physical, u64 length)
{
if (!btrfs_dev_is_sequential(device, physical))
return -EOPNOTSUPP;
return blkdev_issue_zeroout(device->bdev, physical >> SECTOR_SHIFT,
length >> SECTOR_SHIFT, GFP_NOFS, 0);
}
static int read_zone_info(struct btrfs_fs_info *fs_info, u64 logical,
struct blk_zone *zone)
{
struct btrfs_io_context *bioc = NULL;
u64 mapped_length = PAGE_SIZE;
unsigned int nofs_flag;
int nmirrors;
int i, ret;
ret = btrfs_map_block(fs_info, BTRFS_MAP_GET_READ_MIRRORS, logical,
&mapped_length, &bioc, NULL, NULL);
if (ret || !bioc || mapped_length < PAGE_SIZE) {
ret = -EIO;
goto out_put_bioc;
}
if (bioc->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
ret = -EINVAL;
goto out_put_bioc;
}
nofs_flag = memalloc_nofs_save();
nmirrors = (int)bioc->num_stripes;
for (i = 0; i < nmirrors; i++) {
u64 physical = bioc->stripes[i].physical;
struct btrfs_device *dev = bioc->stripes[i].dev;
/* Missing device */
if (!dev->bdev)
continue;
ret = btrfs_get_dev_zone(dev, physical, zone);
/* Failing device */
if (ret == -EIO || ret == -EOPNOTSUPP)
continue;
break;
}
memalloc_nofs_restore(nofs_flag);
out_put_bioc:
btrfs_put_bioc(bioc);
return ret;
}
/*
* Synchronize write pointer in a zone at @physical_start on @tgt_dev, by
* filling zeros between @physical_pos to a write pointer of dev-replace
* source device.
*/
int btrfs_sync_zone_write_pointer(struct btrfs_device *tgt_dev, u64 logical,
u64 physical_start, u64 physical_pos)
{
struct btrfs_fs_info *fs_info = tgt_dev->fs_info;
struct blk_zone zone;
u64 length;
u64 wp;
int ret;
if (!btrfs_dev_is_sequential(tgt_dev, physical_pos))
return 0;
ret = read_zone_info(fs_info, logical, &zone);
if (ret)
return ret;
wp = physical_start + ((zone.wp - zone.start) << SECTOR_SHIFT);
if (physical_pos == wp)
return 0;
if (physical_pos > wp)
return -EUCLEAN;
length = wp - physical_pos;
return btrfs_zoned_issue_zeroout(tgt_dev, physical_pos, length);
}
/*
* Activate block group and underlying device zones
*
* @block_group: the block group to activate
*
* Return: true on success, false otherwise
*/
bool btrfs_zone_activate(struct btrfs_block_group *block_group)
{
struct btrfs_fs_info *fs_info = block_group->fs_info;
struct btrfs_chunk_map *map;
struct btrfs_device *device;
u64 physical;
const bool is_data = (block_group->flags & BTRFS_BLOCK_GROUP_DATA);
bool ret;
int i;
if (!btrfs_is_zoned(block_group->fs_info))
return true;
map = block_group->physical_map;
spin_lock(&fs_info->zone_active_bgs_lock);
spin_lock(&block_group->lock);
if (test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &block_group->runtime_flags)) {
ret = true;
goto out_unlock;
}
/* No space left */
if (btrfs_zoned_bg_is_full(block_group)) {
ret = false;
goto out_unlock;
}
for (i = 0; i < map->num_stripes; i++) {
struct btrfs_zoned_device_info *zinfo;
int reserved = 0;
device = map->stripes[i].dev;
physical = map->stripes[i].physical;
zinfo = device->zone_info;
if (zinfo->max_active_zones == 0)
continue;
if (is_data)
reserved = zinfo->reserved_active_zones;
/*
* For the data block group, leave active zones for one
* metadata block group and one system block group.
*/
if (atomic_read(&zinfo->active_zones_left) <= reserved) {
ret = false;
goto out_unlock;
}
if (!btrfs_dev_set_active_zone(device, physical)) {
/* Cannot activate the zone */
ret = false;
goto out_unlock;
}
if (!is_data)
zinfo->reserved_active_zones--;
}
/* Successfully activated all the zones */
set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &block_group->runtime_flags);
spin_unlock(&block_group->lock);
/* For the active block group list */
btrfs_get_block_group(block_group);
list_add_tail(&block_group->active_bg_list, &fs_info->zone_active_bgs);
spin_unlock(&fs_info->zone_active_bgs_lock);
return true;
out_unlock:
spin_unlock(&block_group->lock);
spin_unlock(&fs_info->zone_active_bgs_lock);
return ret;
}
static void wait_eb_writebacks(struct btrfs_block_group *block_group)
{
struct btrfs_fs_info *fs_info = block_group->fs_info;
const u64 end = block_group->start + block_group->length;
struct radix_tree_iter iter;
struct extent_buffer *eb;
void __rcu **slot;
rcu_read_lock();
radix_tree_for_each_slot(slot, &fs_info->buffer_radix, &iter,
block_group->start >> fs_info->sectorsize_bits) {
eb = radix_tree_deref_slot(slot);
if (!eb)
continue;
if (radix_tree_deref_retry(eb)) {
slot = radix_tree_iter_retry(&iter);
continue;
}
if (eb->start < block_group->start)
continue;
if (eb->start >= end)
break;
slot = radix_tree_iter_resume(slot, &iter);
rcu_read_unlock();
wait_on_extent_buffer_writeback(eb);
rcu_read_lock();
}
rcu_read_unlock();
}
static int do_zone_finish(struct btrfs_block_group *block_group, bool fully_written)
{
struct btrfs_fs_info *fs_info = block_group->fs_info;
struct btrfs_chunk_map *map;
const bool is_metadata = (block_group->flags &
(BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_SYSTEM));
struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
int ret = 0;
int i;
spin_lock(&block_group->lock);
if (!test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &block_group->runtime_flags)) {
spin_unlock(&block_group->lock);
return 0;
}
/* Check if we have unwritten allocated space */
if (is_metadata &&
block_group->start + block_group->alloc_offset > block_group->meta_write_pointer) {
spin_unlock(&block_group->lock);
return -EAGAIN;
}
/*
* If we are sure that the block group is full (= no more room left for
* new allocation) and the IO for the last usable block is completed, we
* don't need to wait for the other IOs. This holds because we ensure
* the sequential IO submissions using the ZONE_APPEND command for data
* and block_group->meta_write_pointer for metadata.
*/
if (!fully_written) {
if (test_bit(BLOCK_GROUP_FLAG_ZONED_DATA_RELOC, &block_group->runtime_flags)) {
spin_unlock(&block_group->lock);
return -EAGAIN;
}
spin_unlock(&block_group->lock);
ret = btrfs_inc_block_group_ro(block_group, false);
if (ret)
return ret;
/* Ensure all writes in this block group finish */
btrfs_wait_block_group_reservations(block_group);
/* No need to wait for NOCOW writers. Zoned mode does not allow that */
btrfs_wait_ordered_roots(fs_info, U64_MAX, block_group);
/* Wait for extent buffers to be written. */
if (is_metadata)
wait_eb_writebacks(block_group);
spin_lock(&block_group->lock);
/*
* Bail out if someone already deactivated the block group, or
* allocated space is left in the block group.
*/
if (!test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE,
&block_group->runtime_flags)) {
spin_unlock(&block_group->lock);
btrfs_dec_block_group_ro(block_group);
return 0;
}
if (block_group->reserved ||
test_bit(BLOCK_GROUP_FLAG_ZONED_DATA_RELOC,
&block_group->runtime_flags)) {
spin_unlock(&block_group->lock);
btrfs_dec_block_group_ro(block_group);
return -EAGAIN;
}
}
clear_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &block_group->runtime_flags);
block_group->alloc_offset = block_group->zone_capacity;
if (block_group->flags & (BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_SYSTEM))
block_group->meta_write_pointer = block_group->start +
block_group->zone_capacity;
block_group->free_space_ctl->free_space = 0;
btrfs_clear_treelog_bg(block_group);
btrfs_clear_data_reloc_bg(block_group);
spin_unlock(&block_group->lock);
down_read(&dev_replace->rwsem);
map = block_group->physical_map;
for (i = 0; i < map->num_stripes; i++) {
struct btrfs_device *device = map->stripes[i].dev;
const u64 physical = map->stripes[i].physical;
struct btrfs_zoned_device_info *zinfo = device->zone_info;
unsigned int nofs_flags;
if (zinfo->max_active_zones == 0)
continue;
nofs_flags = memalloc_nofs_save();
ret = blkdev_zone_mgmt(device->bdev, REQ_OP_ZONE_FINISH,
physical >> SECTOR_SHIFT,
zinfo->zone_size >> SECTOR_SHIFT);
memalloc_nofs_restore(nofs_flags);
if (ret) {
up_read(&dev_replace->rwsem);
return ret;
}
if (!(block_group->flags & BTRFS_BLOCK_GROUP_DATA))
zinfo->reserved_active_zones++;
btrfs_dev_clear_active_zone(device, physical);
}
up_read(&dev_replace->rwsem);
if (!fully_written)
btrfs_dec_block_group_ro(block_group);
spin_lock(&fs_info->zone_active_bgs_lock);
ASSERT(!list_empty(&block_group->active_bg_list));
list_del_init(&block_group->active_bg_list);
spin_unlock(&fs_info->zone_active_bgs_lock);
/* For active_bg_list */
btrfs_put_block_group(block_group);
clear_and_wake_up_bit(BTRFS_FS_NEED_ZONE_FINISH, &fs_info->flags);
return 0;
}
int btrfs_zone_finish(struct btrfs_block_group *block_group)
{
if (!btrfs_is_zoned(block_group->fs_info))
return 0;
return do_zone_finish(block_group, false);
}
bool btrfs_can_activate_zone(struct btrfs_fs_devices *fs_devices, u64 flags)
{
struct btrfs_fs_info *fs_info = fs_devices->fs_info;
struct btrfs_device *device;
bool ret = false;
if (!btrfs_is_zoned(fs_info))
return true;
/* Check if there is a device with active zones left */
mutex_lock(&fs_info->chunk_mutex);
spin_lock(&fs_info->zone_active_bgs_lock);
list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) {
struct btrfs_zoned_device_info *zinfo = device->zone_info;
int reserved = 0;
if (!device->bdev)
continue;
if (!zinfo->max_active_zones) {
ret = true;
break;
}
if (flags & BTRFS_BLOCK_GROUP_DATA)
reserved = zinfo->reserved_active_zones;
switch (flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
case 0: /* single */
ret = (atomic_read(&zinfo->active_zones_left) >= (1 + reserved));
break;
case BTRFS_BLOCK_GROUP_DUP:
ret = (atomic_read(&zinfo->active_zones_left) >= (2 + reserved));
break;
}
if (ret)
break;
}
spin_unlock(&fs_info->zone_active_bgs_lock);
mutex_unlock(&fs_info->chunk_mutex);
if (!ret)
set_bit(BTRFS_FS_NEED_ZONE_FINISH, &fs_info->flags);
return ret;
}
void btrfs_zone_finish_endio(struct btrfs_fs_info *fs_info, u64 logical, u64 length)
{
struct btrfs_block_group *block_group;
u64 min_alloc_bytes;
if (!btrfs_is_zoned(fs_info))
return;
block_group = btrfs_lookup_block_group(fs_info, logical);
ASSERT(block_group);
/* No MIXED_BG on zoned btrfs. */
if (block_group->flags & BTRFS_BLOCK_GROUP_DATA)
min_alloc_bytes = fs_info->sectorsize;
else
min_alloc_bytes = fs_info->nodesize;
/* Bail out if we can allocate more data from this block group. */
if (logical + length + min_alloc_bytes <=
block_group->start + block_group->zone_capacity)
goto out;
do_zone_finish(block_group, true);
out:
btrfs_put_block_group(block_group);
}
static void btrfs_zone_finish_endio_workfn(struct work_struct *work)
{
struct btrfs_block_group *bg =
container_of(work, struct btrfs_block_group, zone_finish_work);
wait_on_extent_buffer_writeback(bg->last_eb);
free_extent_buffer(bg->last_eb);
btrfs_zone_finish_endio(bg->fs_info, bg->start, bg->length);
btrfs_put_block_group(bg);
}
void btrfs_schedule_zone_finish_bg(struct btrfs_block_group *bg,
struct extent_buffer *eb)
{
if (!test_bit(BLOCK_GROUP_FLAG_SEQUENTIAL_ZONE, &bg->runtime_flags) ||
eb->start + eb->len * 2 <= bg->start + bg->zone_capacity)
return;
if (WARN_ON(bg->zone_finish_work.func == btrfs_zone_finish_endio_workfn)) {
btrfs_err(bg->fs_info, "double scheduling of bg %llu zone finishing",
bg->start);
return;
}
/* For the work */
btrfs_get_block_group(bg);
atomic_inc(&eb->refs);
bg->last_eb = eb;
INIT_WORK(&bg->zone_finish_work, btrfs_zone_finish_endio_workfn);
queue_work(system_unbound_wq, &bg->zone_finish_work);
}
void btrfs_clear_data_reloc_bg(struct btrfs_block_group *bg)
{
struct btrfs_fs_info *fs_info = bg->fs_info;
spin_lock(&fs_info->relocation_bg_lock);
if (fs_info->data_reloc_bg == bg->start)
fs_info->data_reloc_bg = 0;
spin_unlock(&fs_info->relocation_bg_lock);
}
void btrfs_free_zone_cache(struct btrfs_fs_info *fs_info)
{
struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
struct btrfs_device *device;
if (!btrfs_is_zoned(fs_info))
return;
mutex_lock(&fs_devices->device_list_mutex);
list_for_each_entry(device, &fs_devices->devices, dev_list) {
if (device->zone_info) {
vfree(device->zone_info->zone_cache);
device->zone_info->zone_cache = NULL;
}
}
mutex_unlock(&fs_devices->device_list_mutex);
}
bool btrfs_zoned_should_reclaim(struct btrfs_fs_info *fs_info)
{
struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
struct btrfs_device *device;
u64 used = 0;
u64 total = 0;
u64 factor;
ASSERT(btrfs_is_zoned(fs_info));
if (fs_info->bg_reclaim_threshold == 0)
return false;
mutex_lock(&fs_devices->device_list_mutex);
list_for_each_entry(device, &fs_devices->devices, dev_list) {
if (!device->bdev)
continue;
total += device->disk_total_bytes;
used += device->bytes_used;
}
mutex_unlock(&fs_devices->device_list_mutex);
factor = div64_u64(used * 100, total);
return factor >= fs_info->bg_reclaim_threshold;
}
void btrfs_zoned_release_data_reloc_bg(struct btrfs_fs_info *fs_info, u64 logical,
u64 length)
{
struct btrfs_block_group *block_group;
if (!btrfs_is_zoned(fs_info))
return;
block_group = btrfs_lookup_block_group(fs_info, logical);
/* It should be called on a previous data relocation block group. */
ASSERT(block_group && (block_group->flags & BTRFS_BLOCK_GROUP_DATA));
spin_lock(&block_group->lock);
if (!test_bit(BLOCK_GROUP_FLAG_ZONED_DATA_RELOC, &block_group->runtime_flags))
goto out;
/* All relocation extents are written. */
if (block_group->start + block_group->alloc_offset == logical + length) {
/*
* Now, release this block group for further allocations and
* zone finish.
*/
clear_bit(BLOCK_GROUP_FLAG_ZONED_DATA_RELOC,
&block_group->runtime_flags);
}
out:
spin_unlock(&block_group->lock);
btrfs_put_block_group(block_group);
}
int btrfs_zone_finish_one_bg(struct btrfs_fs_info *fs_info)
{
struct btrfs_block_group *block_group;
struct btrfs_block_group *min_bg = NULL;
u64 min_avail = U64_MAX;
int ret;
spin_lock(&fs_info->zone_active_bgs_lock);
list_for_each_entry(block_group, &fs_info->zone_active_bgs,
active_bg_list) {
u64 avail;
spin_lock(&block_group->lock);
if (block_group->reserved || block_group->alloc_offset == 0 ||
(block_group->flags & BTRFS_BLOCK_GROUP_SYSTEM) ||
test_bit(BLOCK_GROUP_FLAG_ZONED_DATA_RELOC, &block_group->runtime_flags)) {
spin_unlock(&block_group->lock);
continue;
}
avail = block_group->zone_capacity - block_group->alloc_offset;
if (min_avail > avail) {
if (min_bg)
btrfs_put_block_group(min_bg);
min_bg = block_group;
min_avail = avail;
btrfs_get_block_group(min_bg);
}
spin_unlock(&block_group->lock);
}
spin_unlock(&fs_info->zone_active_bgs_lock);
if (!min_bg)
return 0;
ret = btrfs_zone_finish(min_bg);
btrfs_put_block_group(min_bg);
return ret < 0 ? ret : 1;
}
int btrfs_zoned_activate_one_bg(struct btrfs_fs_info *fs_info,
struct btrfs_space_info *space_info,
bool do_finish)
{
struct btrfs_block_group *bg;
int index;
if (!btrfs_is_zoned(fs_info) || (space_info->flags & BTRFS_BLOCK_GROUP_DATA))
return 0;
for (;;) {
int ret;
bool need_finish = false;
down_read(&space_info->groups_sem);
for (index = 0; index < BTRFS_NR_RAID_TYPES; index++) {
list_for_each_entry(bg, &space_info->block_groups[index],
list) {
if (!spin_trylock(&bg->lock))
continue;
if (btrfs_zoned_bg_is_full(bg) ||
test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE,
&bg->runtime_flags)) {
spin_unlock(&bg->lock);
continue;
}
spin_unlock(&bg->lock);
if (btrfs_zone_activate(bg)) {
up_read(&space_info->groups_sem);
return 1;
}
need_finish = true;
}
}
up_read(&space_info->groups_sem);
if (!do_finish || !need_finish)
break;
ret = btrfs_zone_finish_one_bg(fs_info);
if (ret == 0)
break;
if (ret < 0)
return ret;
}
return 0;
}
/*
* Reserve zones for one metadata block group, one tree-log block group, and one
* system block group.
*/
void btrfs_check_active_zone_reservation(struct btrfs_fs_info *fs_info)
{
struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
struct btrfs_block_group *block_group;
struct btrfs_device *device;
/* Reserve zones for normal SINGLE metadata and tree-log block group. */
unsigned int metadata_reserve = 2;
/* Reserve a zone for SINGLE system block group. */
unsigned int system_reserve = 1;
if (!test_bit(BTRFS_FS_ACTIVE_ZONE_TRACKING, &fs_info->flags))
return;
/*
* This function is called from the mount context. So, there is no
* parallel process touching the bits. No need for read_seqretry().
*/
if (fs_info->avail_metadata_alloc_bits & BTRFS_BLOCK_GROUP_DUP)
metadata_reserve = 4;
if (fs_info->avail_system_alloc_bits & BTRFS_BLOCK_GROUP_DUP)
system_reserve = 2;
/* Apply the reservation on all the devices. */
mutex_lock(&fs_devices->device_list_mutex);
list_for_each_entry(device, &fs_devices->devices, dev_list) {
if (!device->bdev)
continue;
device->zone_info->reserved_active_zones =
metadata_reserve + system_reserve;
}
mutex_unlock(&fs_devices->device_list_mutex);
/* Release reservation for currently active block groups. */
spin_lock(&fs_info->zone_active_bgs_lock);
list_for_each_entry(block_group, &fs_info->zone_active_bgs, active_bg_list) {
struct btrfs_chunk_map *map = block_group->physical_map;
if (!(block_group->flags &
(BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_SYSTEM)))
continue;
for (int i = 0; i < map->num_stripes; i++)
map->stripes[i].dev->zone_info->reserved_active_zones--;
}
spin_unlock(&fs_info->zone_active_bgs_lock);
}
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