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![Qu Wenruo](/assets/img/avatar_default.png)
Currently there is only one user for btrfs metadata readahead, and that's scrub. But even for the single user, it's not providing the correct functionality it needs, as scrub needs reada for commit root, which current readahead can't provide. (Although it's pretty easy to add such feature). Despite this, there are some extra problems related to metadata readahead: - Duplicated feature with btrfs_path::reada - Partly duplicated feature of btrfs_fs_info::buffer_radix Btrfs already caches its metadata in buffer_radix, while readahead tries to read the tree block no matter if it's already cached. - Poor layer separation Metadata readahead works kinda at device level. This is definitely not the correct layer it should be, since metadata is at btrfs logical address space, it should not bother device at all. This brings extra chance for bugs to sneak in, while brings unnecessary complexity. - Dead code In the very beginning of scrub.c we have #undef DEBUG, rendering all the debug related code useless and unable to test. Thus here I purpose to remove the metadata readahead mechanism completely. [BENCHMARK] There is a full benchmark for the scrub performance difference using the old btrfs_reada_add() and btrfs_path::reada. For the worst case (no dirty metadata, slow HDD), there could be a 5% performance drop for scrub. For other cases (even SATA SSD), there is no distinguishable performance difference. The number is reported scrub speed, in MiB/s. The resolution is limited by the reported duration, which only has a resolution of 1 second. Old New Diff SSD 455.3 466.332 +2.42% HDD 103.927 98.012 -5.69% Comprehensive test methodology is in the cover letter of the patch. Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
635 lines
18 KiB
C
635 lines
18 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*/
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#ifndef BTRFS_VOLUMES_H
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#define BTRFS_VOLUMES_H
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#include <linux/bio.h>
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#include <linux/sort.h>
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#include <linux/btrfs.h>
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#include "async-thread.h"
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#define BTRFS_MAX_DATA_CHUNK_SIZE (10ULL * SZ_1G)
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extern struct mutex uuid_mutex;
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#define BTRFS_STRIPE_LEN SZ_64K
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struct btrfs_io_geometry {
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/* remaining bytes before crossing a stripe */
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u64 len;
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/* offset of logical address in chunk */
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u64 offset;
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/* length of single IO stripe */
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u64 stripe_len;
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/* number of stripe where address falls */
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u64 stripe_nr;
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/* offset of address in stripe */
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u64 stripe_offset;
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/* offset of raid56 stripe into the chunk */
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u64 raid56_stripe_offset;
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};
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/*
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* Use sequence counter to get consistent device stat data on
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* 32-bit processors.
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*/
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#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
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#include <linux/seqlock.h>
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#define __BTRFS_NEED_DEVICE_DATA_ORDERED
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#define btrfs_device_data_ordered_init(device) \
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seqcount_init(&device->data_seqcount)
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#else
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#define btrfs_device_data_ordered_init(device) do { } while (0)
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#endif
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#define BTRFS_DEV_STATE_WRITEABLE (0)
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#define BTRFS_DEV_STATE_IN_FS_METADATA (1)
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#define BTRFS_DEV_STATE_MISSING (2)
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#define BTRFS_DEV_STATE_REPLACE_TGT (3)
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#define BTRFS_DEV_STATE_FLUSH_SENT (4)
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#define BTRFS_DEV_STATE_NO_READA (5)
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struct btrfs_zoned_device_info;
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struct btrfs_device {
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struct list_head dev_list; /* device_list_mutex */
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struct list_head dev_alloc_list; /* chunk mutex */
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struct list_head post_commit_list; /* chunk mutex */
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struct btrfs_fs_devices *fs_devices;
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struct btrfs_fs_info *fs_info;
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struct rcu_string __rcu *name;
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u64 generation;
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struct block_device *bdev;
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struct btrfs_zoned_device_info *zone_info;
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/* the mode sent to blkdev_get */
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fmode_t mode;
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unsigned long dev_state;
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blk_status_t last_flush_error;
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#ifdef __BTRFS_NEED_DEVICE_DATA_ORDERED
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seqcount_t data_seqcount;
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#endif
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/* the internal btrfs device id */
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u64 devid;
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/* size of the device in memory */
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u64 total_bytes;
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/* size of the device on disk */
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u64 disk_total_bytes;
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/* bytes used */
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u64 bytes_used;
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/* optimal io alignment for this device */
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u32 io_align;
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/* optimal io width for this device */
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u32 io_width;
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/* type and info about this device */
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u64 type;
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/* minimal io size for this device */
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u32 sector_size;
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/* physical drive uuid (or lvm uuid) */
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u8 uuid[BTRFS_UUID_SIZE];
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/*
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* size of the device on the current transaction
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*
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* This variant is update when committing the transaction,
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* and protected by chunk mutex
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*/
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u64 commit_total_bytes;
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/* bytes used on the current transaction */
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u64 commit_bytes_used;
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/* for sending down flush barriers */
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struct bio *flush_bio;
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struct completion flush_wait;
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/* per-device scrub information */
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struct scrub_ctx *scrub_ctx;
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/* disk I/O failure stats. For detailed description refer to
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* enum btrfs_dev_stat_values in ioctl.h */
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int dev_stats_valid;
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/* Counter to record the change of device stats */
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atomic_t dev_stats_ccnt;
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atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
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struct extent_io_tree alloc_state;
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struct completion kobj_unregister;
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/* For sysfs/FSID/devinfo/devid/ */
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struct kobject devid_kobj;
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/* Bandwidth limit for scrub, in bytes */
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u64 scrub_speed_max;
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};
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/*
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* If we read those variants at the context of their own lock, we needn't
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* use the following helpers, reading them directly is safe.
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*/
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#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
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#define BTRFS_DEVICE_GETSET_FUNCS(name) \
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static inline u64 \
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btrfs_device_get_##name(const struct btrfs_device *dev) \
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{ \
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u64 size; \
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unsigned int seq; \
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\
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do { \
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seq = read_seqcount_begin(&dev->data_seqcount); \
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size = dev->name; \
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} while (read_seqcount_retry(&dev->data_seqcount, seq)); \
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return size; \
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} \
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\
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static inline void \
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btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
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{ \
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preempt_disable(); \
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write_seqcount_begin(&dev->data_seqcount); \
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dev->name = size; \
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write_seqcount_end(&dev->data_seqcount); \
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preempt_enable(); \
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}
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#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
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#define BTRFS_DEVICE_GETSET_FUNCS(name) \
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static inline u64 \
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btrfs_device_get_##name(const struct btrfs_device *dev) \
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{ \
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u64 size; \
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\
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preempt_disable(); \
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size = dev->name; \
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preempt_enable(); \
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return size; \
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} \
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\
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static inline void \
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btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
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{ \
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preempt_disable(); \
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dev->name = size; \
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preempt_enable(); \
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}
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#else
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#define BTRFS_DEVICE_GETSET_FUNCS(name) \
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static inline u64 \
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btrfs_device_get_##name(const struct btrfs_device *dev) \
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{ \
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return dev->name; \
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} \
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\
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static inline void \
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btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
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{ \
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dev->name = size; \
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}
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#endif
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BTRFS_DEVICE_GETSET_FUNCS(total_bytes);
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BTRFS_DEVICE_GETSET_FUNCS(disk_total_bytes);
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BTRFS_DEVICE_GETSET_FUNCS(bytes_used);
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enum btrfs_chunk_allocation_policy {
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BTRFS_CHUNK_ALLOC_REGULAR,
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BTRFS_CHUNK_ALLOC_ZONED,
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};
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/*
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* Read policies for mirrored block group profiles, read picks the stripe based
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* on these policies.
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*/
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enum btrfs_read_policy {
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/* Use process PID to choose the stripe */
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BTRFS_READ_POLICY_PID,
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BTRFS_NR_READ_POLICY,
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};
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struct btrfs_fs_devices {
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u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
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u8 metadata_uuid[BTRFS_FSID_SIZE];
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bool fsid_change;
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struct list_head fs_list;
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/*
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* Number of devices under this fsid including missing and
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* replace-target device and excludes seed devices.
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*/
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u64 num_devices;
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/*
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* The number of devices that successfully opened, including
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* replace-target, excludes seed devices.
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*/
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u64 open_devices;
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/* The number of devices that are under the chunk allocation list. */
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u64 rw_devices;
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/* Count of missing devices under this fsid excluding seed device. */
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u64 missing_devices;
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u64 total_rw_bytes;
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/*
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* Count of devices from btrfs_super_block::num_devices for this fsid,
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* which includes the seed device, excludes the transient replace-target
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* device.
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*/
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u64 total_devices;
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/* Highest generation number of seen devices */
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u64 latest_generation;
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/*
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* The mount device or a device with highest generation after removal
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* or replace.
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*/
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struct btrfs_device *latest_dev;
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/* all of the devices in the FS, protected by a mutex
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* so we can safely walk it to write out the supers without
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* worrying about add/remove by the multi-device code.
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* Scrubbing super can kick off supers writing by holding
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* this mutex lock.
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*/
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struct mutex device_list_mutex;
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/* List of all devices, protected by device_list_mutex */
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struct list_head devices;
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/*
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* Devices which can satisfy space allocation. Protected by
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* chunk_mutex
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*/
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struct list_head alloc_list;
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struct list_head seed_list;
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bool seeding;
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int opened;
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/* set when we find or add a device that doesn't have the
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* nonrot flag set
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*/
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bool rotating;
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struct btrfs_fs_info *fs_info;
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/* sysfs kobjects */
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struct kobject fsid_kobj;
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struct kobject *devices_kobj;
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struct kobject *devinfo_kobj;
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struct completion kobj_unregister;
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enum btrfs_chunk_allocation_policy chunk_alloc_policy;
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/* Policy used to read the mirrored stripes */
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enum btrfs_read_policy read_policy;
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};
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#define BTRFS_BIO_INLINE_CSUM_SIZE 64
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#define BTRFS_MAX_DEVS(info) ((BTRFS_MAX_ITEM_SIZE(info) \
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- sizeof(struct btrfs_chunk)) \
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/ sizeof(struct btrfs_stripe) + 1)
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#define BTRFS_MAX_DEVS_SYS_CHUNK ((BTRFS_SYSTEM_CHUNK_ARRAY_SIZE \
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- 2 * sizeof(struct btrfs_disk_key) \
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- 2 * sizeof(struct btrfs_chunk)) \
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/ sizeof(struct btrfs_stripe) + 1)
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/*
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* Additional info to pass along bio.
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*
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* Mostly for btrfs specific features like csum and mirror_num.
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*/
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struct btrfs_bio {
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unsigned int mirror_num;
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/* @device is for stripe IO submission. */
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struct btrfs_device *device;
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u8 *csum;
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u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
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struct bvec_iter iter;
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/*
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* This member must come last, bio_alloc_bioset will allocate enough
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* bytes for entire btrfs_bio but relies on bio being last.
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*/
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struct bio bio;
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};
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static inline struct btrfs_bio *btrfs_bio(struct bio *bio)
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{
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return container_of(bio, struct btrfs_bio, bio);
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}
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static inline void btrfs_bio_free_csum(struct btrfs_bio *bbio)
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{
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if (bbio->csum != bbio->csum_inline) {
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kfree(bbio->csum);
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bbio->csum = NULL;
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}
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}
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struct btrfs_io_stripe {
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struct btrfs_device *dev;
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u64 physical;
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u64 length; /* only used for discard mappings */
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};
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/*
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* Context for IO subsmission for device stripe.
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*
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* - Track the unfinished mirrors for mirror based profiles
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* Mirror based profiles are SINGLE/DUP/RAID1/RAID10.
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*
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* - Contain the logical -> physical mapping info
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* Used by submit_stripe_bio() for mapping logical bio
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* into physical device address.
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*
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* - Contain device replace info
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* Used by handle_ops_on_dev_replace() to copy logical bios
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* into the new device.
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*
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* - Contain RAID56 full stripe logical bytenrs
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*/
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struct btrfs_io_context {
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refcount_t refs;
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atomic_t stripes_pending;
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struct btrfs_fs_info *fs_info;
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u64 map_type; /* get from map_lookup->type */
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bio_end_io_t *end_io;
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struct bio *orig_bio;
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void *private;
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atomic_t error;
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int max_errors;
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int num_stripes;
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int mirror_num;
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int num_tgtdevs;
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int *tgtdev_map;
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/*
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* logical block numbers for the start of each stripe
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* The last one or two are p/q. These are sorted,
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* so raid_map[0] is the start of our full stripe
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*/
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u64 *raid_map;
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struct btrfs_io_stripe stripes[];
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};
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struct btrfs_device_info {
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struct btrfs_device *dev;
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u64 dev_offset;
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u64 max_avail;
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u64 total_avail;
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};
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struct btrfs_raid_attr {
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u8 sub_stripes; /* sub_stripes info for map */
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u8 dev_stripes; /* stripes per dev */
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u8 devs_max; /* max devs to use */
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u8 devs_min; /* min devs needed */
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u8 tolerated_failures; /* max tolerated fail devs */
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u8 devs_increment; /* ndevs has to be a multiple of this */
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u8 ncopies; /* how many copies to data has */
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u8 nparity; /* number of stripes worth of bytes to store
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* parity information */
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u8 mindev_error; /* error code if min devs requisite is unmet */
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const char raid_name[8]; /* name of the raid */
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u64 bg_flag; /* block group flag of the raid */
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};
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extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES];
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struct map_lookup {
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u64 type;
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int io_align;
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int io_width;
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u64 stripe_len;
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int num_stripes;
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int sub_stripes;
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int verified_stripes; /* For mount time dev extent verification */
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struct btrfs_io_stripe stripes[];
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};
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#define map_lookup_size(n) (sizeof(struct map_lookup) + \
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(sizeof(struct btrfs_io_stripe) * (n)))
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struct btrfs_balance_args;
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struct btrfs_balance_progress;
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struct btrfs_balance_control {
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struct btrfs_balance_args data;
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struct btrfs_balance_args meta;
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struct btrfs_balance_args sys;
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u64 flags;
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struct btrfs_balance_progress stat;
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};
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/*
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* Search for a given device by the set parameters
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*/
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struct btrfs_dev_lookup_args {
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u64 devid;
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u8 *uuid;
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u8 *fsid;
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bool missing;
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};
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/* We have to initialize to -1 because BTRFS_DEV_REPLACE_DEVID is 0 */
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#define BTRFS_DEV_LOOKUP_ARGS_INIT { .devid = (u64)-1 }
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#define BTRFS_DEV_LOOKUP_ARGS(name) \
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struct btrfs_dev_lookup_args name = BTRFS_DEV_LOOKUP_ARGS_INIT
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enum btrfs_map_op {
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BTRFS_MAP_READ,
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BTRFS_MAP_WRITE,
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BTRFS_MAP_DISCARD,
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BTRFS_MAP_GET_READ_MIRRORS,
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};
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static inline enum btrfs_map_op btrfs_op(struct bio *bio)
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{
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switch (bio_op(bio)) {
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case REQ_OP_DISCARD:
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return BTRFS_MAP_DISCARD;
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case REQ_OP_WRITE:
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case REQ_OP_ZONE_APPEND:
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return BTRFS_MAP_WRITE;
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default:
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WARN_ON_ONCE(1);
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fallthrough;
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case REQ_OP_READ:
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return BTRFS_MAP_READ;
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}
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}
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void btrfs_get_bioc(struct btrfs_io_context *bioc);
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void btrfs_put_bioc(struct btrfs_io_context *bioc);
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int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
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u64 logical, u64 *length,
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struct btrfs_io_context **bioc_ret, int mirror_num);
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int btrfs_map_sblock(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
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u64 logical, u64 *length,
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struct btrfs_io_context **bioc_ret);
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int btrfs_get_io_geometry(struct btrfs_fs_info *fs_info, struct extent_map *map,
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enum btrfs_map_op op, u64 logical,
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struct btrfs_io_geometry *io_geom);
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int btrfs_read_sys_array(struct btrfs_fs_info *fs_info);
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int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info);
|
|
struct btrfs_block_group *btrfs_create_chunk(struct btrfs_trans_handle *trans,
|
|
u64 type);
|
|
void btrfs_mapping_tree_free(struct extent_map_tree *tree);
|
|
blk_status_t btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
|
|
int mirror_num);
|
|
int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
|
|
fmode_t flags, void *holder);
|
|
struct btrfs_device *btrfs_scan_one_device(const char *path,
|
|
fmode_t flags, void *holder);
|
|
int btrfs_forget_devices(const char *path);
|
|
void btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
|
|
void btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices);
|
|
void btrfs_assign_next_active_device(struct btrfs_device *device,
|
|
struct btrfs_device *this_dev);
|
|
struct btrfs_device *btrfs_find_device_by_devspec(struct btrfs_fs_info *fs_info,
|
|
u64 devid,
|
|
const char *devpath);
|
|
int btrfs_get_dev_args_from_path(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_dev_lookup_args *args,
|
|
const char *path);
|
|
struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
|
|
const u64 *devid,
|
|
const u8 *uuid);
|
|
void btrfs_put_dev_args_from_path(struct btrfs_dev_lookup_args *args);
|
|
void btrfs_free_device(struct btrfs_device *device);
|
|
int btrfs_rm_device(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_dev_lookup_args *args,
|
|
struct block_device **bdev, fmode_t *mode);
|
|
void __exit btrfs_cleanup_fs_uuids(void);
|
|
int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
|
|
int btrfs_grow_device(struct btrfs_trans_handle *trans,
|
|
struct btrfs_device *device, u64 new_size);
|
|
struct btrfs_device *btrfs_find_device(const struct btrfs_fs_devices *fs_devices,
|
|
const struct btrfs_dev_lookup_args *args);
|
|
int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
|
|
int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *path);
|
|
int btrfs_balance(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_balance_control *bctl,
|
|
struct btrfs_ioctl_balance_args *bargs);
|
|
void btrfs_describe_block_groups(u64 flags, char *buf, u32 size_buf);
|
|
int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
|
|
int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
|
|
int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
|
|
int btrfs_relocate_chunk(struct btrfs_fs_info *fs_info, u64 chunk_offset);
|
|
int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
|
|
int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info);
|
|
int btrfs_uuid_scan_kthread(void *data);
|
|
bool btrfs_chunk_writeable(struct btrfs_fs_info *fs_info, u64 chunk_offset);
|
|
int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes,
|
|
u64 *start, u64 *max_avail);
|
|
void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
|
|
int btrfs_get_dev_stats(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_ioctl_get_dev_stats *stats);
|
|
void btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
|
|
int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
|
|
int btrfs_run_dev_stats(struct btrfs_trans_handle *trans);
|
|
void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_device *srcdev);
|
|
void btrfs_rm_dev_replace_free_srcdev(struct btrfs_device *srcdev);
|
|
void btrfs_destroy_dev_replace_tgtdev(struct btrfs_device *tgtdev);
|
|
int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info,
|
|
u64 logical, u64 len);
|
|
unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info,
|
|
u64 logical);
|
|
int btrfs_chunk_alloc_add_chunk_item(struct btrfs_trans_handle *trans,
|
|
struct btrfs_block_group *bg);
|
|
int btrfs_remove_chunk(struct btrfs_trans_handle *trans, u64 chunk_offset);
|
|
struct extent_map *btrfs_get_chunk_map(struct btrfs_fs_info *fs_info,
|
|
u64 logical, u64 length);
|
|
void btrfs_release_disk_super(struct btrfs_super_block *super);
|
|
|
|
static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
|
|
int index)
|
|
{
|
|
atomic_inc(dev->dev_stat_values + index);
|
|
/*
|
|
* This memory barrier orders stores updating statistics before stores
|
|
* updating dev_stats_ccnt.
|
|
*
|
|
* It pairs with smp_rmb() in btrfs_run_dev_stats().
|
|
*/
|
|
smp_mb__before_atomic();
|
|
atomic_inc(&dev->dev_stats_ccnt);
|
|
}
|
|
|
|
static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
|
|
int index)
|
|
{
|
|
return atomic_read(dev->dev_stat_values + index);
|
|
}
|
|
|
|
static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
|
|
int index)
|
|
{
|
|
int ret;
|
|
|
|
ret = atomic_xchg(dev->dev_stat_values + index, 0);
|
|
/*
|
|
* atomic_xchg implies a full memory barriers as per atomic_t.txt:
|
|
* - RMW operations that have a return value are fully ordered;
|
|
*
|
|
* This implicit memory barriers is paired with the smp_rmb in
|
|
* btrfs_run_dev_stats
|
|
*/
|
|
atomic_inc(&dev->dev_stats_ccnt);
|
|
return ret;
|
|
}
|
|
|
|
static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
|
|
int index, unsigned long val)
|
|
{
|
|
atomic_set(dev->dev_stat_values + index, val);
|
|
/*
|
|
* This memory barrier orders stores updating statistics before stores
|
|
* updating dev_stats_ccnt.
|
|
*
|
|
* It pairs with smp_rmb() in btrfs_run_dev_stats().
|
|
*/
|
|
smp_mb__before_atomic();
|
|
atomic_inc(&dev->dev_stats_ccnt);
|
|
}
|
|
|
|
void btrfs_commit_device_sizes(struct btrfs_transaction *trans);
|
|
|
|
struct list_head * __attribute_const__ btrfs_get_fs_uuids(void);
|
|
bool btrfs_check_rw_degradable(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_device *failing_dev);
|
|
void btrfs_scratch_superblocks(struct btrfs_fs_info *fs_info,
|
|
struct block_device *bdev,
|
|
const char *device_path);
|
|
|
|
enum btrfs_raid_types __attribute_const__ btrfs_bg_flags_to_raid_index(u64 flags);
|
|
int btrfs_bg_type_to_factor(u64 flags);
|
|
const char *btrfs_bg_type_to_raid_name(u64 flags);
|
|
int btrfs_verify_dev_extents(struct btrfs_fs_info *fs_info);
|
|
bool btrfs_repair_one_zone(struct btrfs_fs_info *fs_info, u64 logical);
|
|
|
|
#endif
|