[v10,04/41] btrfs: get zone information of zoned block devices

Message ID	cf46f0aef5a214cae8bacb2be231efed5febef5f.1605007036.git.naohiro.aota@wdc.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <linux-fsdevel-owner@kernel.org> IronPort-SDR: +wcSj9+Nca+06XtHLzfuAWJPaVqbLI8qsR6/AS146BcCqsqK9GOKptn0ir0dQJDVHTVZZ6TSWQ fHitmnYkHfo3rRr0SejDwfQ8a+hFwKZPiIpaDSncmRixNdhqPsRjXqZ6xcT7SswaNz8/Xf1MFA tgjHk9EFdAb24zggvmQ6rZ0Q97K2yjxY5n8hf2esw7reVrt8uTg30/JB/sP+gzODxBuDpM8g5G NkTgCrMnxKWS5TO4ahHn0xWYRW7iYp0/ZawK7yGIVAhYAP+goakdkUxNGdHClkbUrU0KwkOI23 vIo= IronPort-SDR: YwDpQsYa4y/V2Bp82pGEaCEg4evkdZnHhWP9XdRckXA44fHl+l/vWq8HFfO9lWXbF1iTjzm/u6 59hN3NKERL9J957252f7suYLCI97kEbOLfoLMRM1OiNo2y9D9tg9lp+r1IKzxXCL6BiCX2MFpn Si1jrRLTUEc/JPlbYLrEx/ZzvCYFy5PsqBA3TlHuzPEH3zrMyc539QPidXFKW82lxZcMpP5tAr snuxxlGJpUzI/k6XseKPMWAfT4BGGJcks9w5n4jUzk6pSb6uVYsWPDamQwbQH+1z+Ln7EnKg1O AkpPdXwHXNJUB5OcYxDbqjAJ IronPort-SDR: QCXKOXZQ80NT8cI1OHh32rbCiHPL2m9Vzx7wc/3m0jP1W1cxWJuJVKoQLOfgRusow85kJ6KdFw nVEQ3b5FSFeNf1BIExDSbpTMgKf9kT35W6q8wl10p7AqNayetu/DX1J6asECg9hYYBVg0qI+/1 KIa4krs1IARLtFy7eUy+QzEKdkAPVpeqjFjN3xI72iK+hsyI6Mr0p3Eh0eSOUdRxoy9z+znLJS siFPDevK8owA4CKmNKpztcQjOql3V4+JHHhNbubRaCJEnIYJnxIqGCHqAAkpcI3sbvKx45YXRn 6ok= WDCIronportException: Internal From: Naohiro Aota <naohiro.aota@wdc.com> To: linux-btrfs@vger.kernel.org, dsterba@suse.com Cc: hare@suse.com, linux-fsdevel@vger.kernel.org, Jens Axboe <axboe@kernel.dk>, Christoph Hellwig <hch@infradead.org>, "Darrick J. Wong" <darrick.wong@oracle.com>, Naohiro Aota <naohiro.aota@wdc.com>, Damien Le Moal <damien.lemoal@wdc.com>, Josef Bacik <josef@toxicpanda.com> Subject: [PATCH v10 04/41] btrfs: get zone information of zoned block devices Date: Tue, 10 Nov 2020 20:26:07 +0900 Message-Id: <cf46f0aef5a214cae8bacb2be231efed5febef5f.1605007036.git.naohiro.aota@wdc.com> In-Reply-To: <cover.1605007036.git.naohiro.aota@wdc.com> References: <cover.1605007036.git.naohiro.aota@wdc.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	btrfs: zoned block device support \| expand [v10,00/41] btrfs: zoned block device support [v10,01/41] block: add bio_add_zone_append_page [v10,02/41] iomap: support REQ_OP_ZONE_APPEND [v10,03/41] btrfs: introduce ZONED feature flag [v10,04/41] btrfs: get zone information of zoned block devices [v10,05/41] btrfs: check and enable ZONED mode [v10,06/41] btrfs: introduce max_zone_append_size [v10,07/41] btrfs: disallow space_cache in ZONED mode [v10,08/41] btrfs: disallow NODATACOW in ZONED mode [v10,09/41] btrfs: disable fallocate in ZONED mode [v10,10/41] btrfs: disallow mixed-bg in ZONED mode [v10,11/41] btrfs: implement log-structured superblock for ZONED mode [v10,12/41] btrfs: implement zoned chunk allocator [v10,13/41] btrfs: verify device extent is aligned to zone [v10,14/41] btrfs: load zone's alloction offset [v10,15/41] btrfs: emulate write pointer for conventional zones [v10,16/41] btrfs: track unusable bytes for zones [v10,17/41] btrfs: do sequential extent allocation in ZONED mode [v10,18/41] btrfs: reset zones of unused block groups [v10,19/41] btrfs: redirty released extent buffers in ZONED mode [v10,20/41] btrfs: extract page adding function [v10,21/41] btrfs: use bio_add_zone_append_page for zoned btrfs [v10,22/41] btrfs: handle REQ_OP_ZONE_APPEND as writing [v10,23/41] btrfs: split ordered extent when bio is sent [v10,24/41] btrfs: extend btrfs_rmap_block for specifying a device [v10,25/41] btrfs: use ZONE_APPEND write for ZONED btrfs [v10,26/41] btrfs: enable zone append writing for direct IO [v10,27/41] btrfs: introduce dedicated data write path for ZONED mode [v10,28/41] btrfs: serialize meta IOs on ZONED mode [v10,29/41] btrfs: wait existing extents before truncating [v10,30/41] btrfs: avoid async metadata checksum on ZONED mode [v10,31/41] btrfs: mark block groups to copy for device-replace [v10,32/41] btrfs: implement cloning for ZONED device-replace [v10,33/41] btrfs: implement copying for ZONED device-replace [v10,34/41] btrfs: support dev-replace in ZONED mode [v10,35/41] btrfs: enable relocation in ZONED mode [v10,36/41] btrfs: relocate block group to repair IO failure in ZONED [v10,37/41] btrfs: split alloc_log_tree() [v10,38/41] btrfs: extend zoned allocator to use dedicated tree-log block group [v10,39/41] btrfs: serialize log transaction on ZONED mode [v10,40/41] btrfs: reorder log node allocation [v10,41/41] btrfs: enable to mount ZONED incompat flag

diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile index e738f6206ea5..0497fdc37f90 100644 --- a/fs/btrfs/Makefile +++ b/fs/btrfs/Makefile @@ -16,6 +16,7 @@ btrfs-y += super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \ btrfs-$(CONFIG_BTRFS_FS_POSIX_ACL) += acl.o btrfs-$(CONFIG_BTRFS_FS_CHECK_INTEGRITY) += check-integrity.o btrfs-$(CONFIG_BTRFS_FS_REF_VERIFY) += ref-verify.o +btrfs-$(CONFIG_BLK_DEV_ZONED) += zoned.o btrfs-$(CONFIG_BTRFS_FS_RUN_SANITY_TESTS) += tests/free-space-tests.o \ tests/extent-buffer-tests.o tests/btrfs-tests.o \ diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c index 20ce1970015f..6f6d77224c2b 100644 --- a/fs/btrfs/dev-replace.c +++ b/fs/btrfs/dev-replace.c @@ -21,6 +21,7 @@ #include "rcu-string.h" #include "dev-replace.h" #include "sysfs.h" +#include "zoned.h" /* * Device replace overview @@ -291,6 +292,10 @@ static int btrfs_init_dev_replace_tgtdev(struct btrfs_fs_info *fs_info, set_blocksize(device->bdev, BTRFS_BDEV_BLOCKSIZE); device->fs_devices = fs_info->fs_devices; + ret = btrfs_get_dev_zone_info(device); + if (ret) + goto error; + mutex_lock(&fs_info->fs_devices->device_list_mutex); list_add(&device->dev_list, &fs_info->fs_devices->devices); fs_info->fs_devices->num_devices++; diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 8840a4fa81eb..ed55014fd1bd 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -2462,6 +2462,11 @@ static void __init btrfs_print_mod_info(void) #endif #ifdef CONFIG_BTRFS_FS_REF_VERIFY ", ref-verify=on" +#endif +#ifdef CONFIG_BLK_DEV_ZONED + ", zoned=yes" +#else + ", zoned=no" #endif ; pr_info("Btrfs loaded, crc32c=%s%s\n", crc32c_impl(), options); diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 58b9c419a2b6..e787bf89f761 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -31,6 +31,7 @@ #include "space-info.h" #include "block-group.h" #include "discard.h" +#include "zoned.h" const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = { [BTRFS_RAID_RAID10] = { @@ -374,6 +375,7 @@ void btrfs_free_device(struct btrfs_device *device) rcu_string_free(device->name); extent_io_tree_release(&device->alloc_state); bio_put(device->flush_bio); + btrfs_destroy_dev_zone_info(device); kfree(device); } @@ -667,6 +669,11 @@ static int btrfs_open_one_device(struct btrfs_fs_devices *fs_devices, clear_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state); device->mode = flags; + /* Get zone type information of zoned block devices */ + ret = btrfs_get_dev_zone_info(device); + if (ret != 0) + goto error_free_page; + fs_devices->open_devices++; if (test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state) && device->devid != BTRFS_DEV_REPLACE_DEVID) { @@ -1143,6 +1150,7 @@ static void btrfs_close_one_device(struct btrfs_device *device) device->bdev = NULL; } clear_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state); + btrfs_destroy_dev_zone_info(device); device->fs_info = NULL; atomic_set(&device->dev_stats_ccnt, 0); @@ -2543,6 +2551,14 @@ int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *device_path } rcu_assign_pointer(device->name, name); + device->fs_info = fs_info; + device->bdev = bdev; + + /* Get zone type information of zoned block devices */ + ret = btrfs_get_dev_zone_info(device); + if (ret) + goto error_free_device; + trans = btrfs_start_transaction(root, 0); if (IS_ERR(trans)) { ret = PTR_ERR(trans); @@ -2559,8 +2575,6 @@ int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *device_path fs_info->sectorsize); device->disk_total_bytes = device->total_bytes; device->commit_total_bytes = device->total_bytes; - device->fs_info = fs_info; - device->bdev = bdev; set_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state); clear_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state); device->mode = FMODE_EXCL; @@ -2707,6 +2721,7 @@ int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *device_path sb->s_flags |= SB_RDONLY; if (trans) btrfs_end_transaction(trans); + btrfs_destroy_dev_zone_info(device); error_free_device: btrfs_free_device(device); error: diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index bf27ac07d315..9c07b97a2260 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -51,6 +51,8 @@ struct btrfs_io_geometry { #define BTRFS_DEV_STATE_REPLACE_TGT (3) #define BTRFS_DEV_STATE_FLUSH_SENT (4) +struct btrfs_zoned_device_info; + struct btrfs_device { struct list_head dev_list; /* device_list_mutex */ struct list_head dev_alloc_list; /* chunk mutex */ @@ -64,6 +66,8 @@ struct btrfs_device { struct block_device *bdev; + struct btrfs_zoned_device_info *zone_info; + /* the mode sent to blkdev_get */ fmode_t mode; diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c new file mode 100644 index 000000000000..b7ffe6670d3a --- /dev/null +++ b/fs/btrfs/zoned.c @@ -0,0 +1,182 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/slab.h> +#include <linux/blkdev.h> +#include "ctree.h" +#include "volumes.h" +#include "zoned.h" +#include "rcu-string.h" + +/* Maximum number of zones to report per blkdev_report_zones() call */ +#define BTRFS_REPORT_NR_ZONES 4096 + +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 btrfs_get_dev_zones(struct btrfs_device *device, u64 pos, + struct blk_zone *zones, unsigned int *nr_zones) +{ + int ret; + + if (!*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; + + return 0; +} + +int btrfs_get_dev_zone_info(struct btrfs_device *device) +{ + struct btrfs_zoned_device_info *zone_info = NULL; + struct block_device *bdev = device->bdev; + sector_t nr_sectors = bdev->bd_part->nr_sects; + sector_t sector = 0; + struct blk_zone *zones = NULL; + unsigned int i, nreported = 0, nr_zones; + unsigned int zone_sectors; + int ret; + + if (!bdev_is_zoned(bdev)) + return 0; + + if (device->zone_info) + return 0; + + zone_info = kzalloc(sizeof(*zone_info), GFP_KERNEL); + if (!zone_info) + return -ENOMEM; + + zone_sectors = bdev_zone_sectors(bdev); + ASSERT(is_power_of_2(zone_sectors)); + zone_info->zone_size = (u64)zone_sectors << SECTOR_SHIFT; + zone_info->zone_size_shift = ilog2(zone_info->zone_size); + zone_info->nr_zones = nr_sectors >> ilog2(bdev_zone_sectors(bdev)); + if (!IS_ALIGNED(nr_sectors, zone_sectors)) + zone_info->nr_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; + } + + zones = kcalloc(BTRFS_REPORT_NR_ZONES, + sizeof(struct blk_zone), GFP_KERNEL); + if (!zones) { + ret = -ENOMEM; + goto out; + } + + /* Get zones type */ + 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); + if (zones[i].cond == BLK_ZONE_COND_EMPTY) + set_bit(nreported, zone_info->empty_zones); + 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; + } + + kfree(zones); + + device->zone_info = zone_info; + + /* + * This function is called from open_fs_devices(), which is before + * we set the device->fs_info. So, we use pr_info instead of + * btrfs_info to avoid printing confusing message like "BTRFS info + * (device <unknown>) ..." + */ + + rcu_read_lock(); + if (device->fs_info) + btrfs_info(device->fs_info, + "host-%s zoned block device %s, %u zones of %llu bytes", + bdev_zoned_model(bdev) == BLK_ZONED_HM ? "managed" : "aware", + rcu_str_deref(device->name), zone_info->nr_zones, + zone_info->zone_size); + else + pr_info("BTRFS info: host-%s zoned block device %s, %u zones of %llu bytes", + bdev_zoned_model(bdev) == BLK_ZONED_HM ? "managed" : "aware", + rcu_str_deref(device->name), zone_info->nr_zones, + zone_info->zone_size); + rcu_read_unlock(); + + return 0; + +out: + kfree(zones); + bitmap_free(zone_info->empty_zones); + bitmap_free(zone_info->seq_zones); + kfree(zone_info); + + 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->seq_zones); + bitmap_free(zone_info->empty_zones); + kfree(zone_info); + device->zone_info = 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; +} diff --git a/fs/btrfs/zoned.h b/fs/btrfs/zoned.h new file mode 100644 index 000000000000..c9e69ff87ab9 --- /dev/null +++ b/fs/btrfs/zoned.h @@ -0,0 +1,91 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef BTRFS_ZONED_H +#define BTRFS_ZONED_H + +#include <linux/types.h> + +struct btrfs_zoned_device_info { + /* + * Number of zones, zone size and types of zones if bdev is a + * zoned block device. + */ + u64 zone_size; + u8 zone_size_shift; + u32 nr_zones; + unsigned long *seq_zones; + unsigned long *empty_zones; +}; + +#ifdef CONFIG_BLK_DEV_ZONED +int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos, + struct blk_zone *zone); +int btrfs_get_dev_zone_info(struct btrfs_device *device); +void btrfs_destroy_dev_zone_info(struct btrfs_device *device); +#else /* CONFIG_BLK_DEV_ZONED */ +static inline int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos, + struct blk_zone *zone) +{ + return 0; +} + +static inline int btrfs_get_dev_zone_info(struct btrfs_device *device) +{ + return 0; +} + +static inline void btrfs_destroy_dev_zone_info(struct btrfs_device *device) { } + +#endif + +static inline bool btrfs_dev_is_sequential(struct btrfs_device *device, u64 pos) +{ + struct btrfs_zoned_device_info *zone_info = device->zone_info; + + if (!zone_info) + return false; + + return test_bit(pos >> zone_info->zone_size_shift, + zone_info->seq_zones); +} + +static inline bool btrfs_dev_is_empty_zone(struct btrfs_device *device, u64 pos) +{ + struct btrfs_zoned_device_info *zone_info = device->zone_info; + + if (!zone_info) + return true; + + return test_bit(pos >> zone_info->zone_size_shift, + zone_info->empty_zones); +} + +static inline void btrfs_dev_set_empty_zone_bit(struct btrfs_device *device, + u64 pos, bool set) +{ + struct btrfs_zoned_device_info *zone_info = device->zone_info; + unsigned int zno; + + if (!zone_info) + return; + + zno = pos >> zone_info->zone_size_shift; + if (set) + set_bit(zno, zone_info->empty_zones); + else + clear_bit(zno, zone_info->empty_zones); +} + +static inline void btrfs_dev_set_zone_empty(struct btrfs_device *device, + u64 pos) +{ + btrfs_dev_set_empty_zone_bit(device, pos, true); +} + +static inline void btrfs_dev_clear_zone_empty(struct btrfs_device *device, + u64 pos) +{ + btrfs_dev_set_empty_zone_bit(device, pos, false); +} + +#endif

[v10,04/41] btrfs: get zone information of zoned block devices

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