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![Christoph Hellwig](/assets/img/avatar_default.png)
bdev->bd_super is unused now, remove it. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Christian Brauner <brauner@kernel.org> Message-Id: <20230807112625.652089-5-hch@lst.de> Signed-off-by: Christian Brauner <brauner@kernel.org>
543 lines
17 KiB
C
543 lines
17 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Block data types and constants. Directly include this file only to
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* break include dependency loop.
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*/
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#ifndef __LINUX_BLK_TYPES_H
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#define __LINUX_BLK_TYPES_H
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#include <linux/types.h>
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#include <linux/bvec.h>
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#include <linux/device.h>
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#include <linux/ktime.h>
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struct bio_set;
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struct bio;
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struct bio_integrity_payload;
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struct page;
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struct io_context;
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struct cgroup_subsys_state;
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typedef void (bio_end_io_t) (struct bio *);
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struct bio_crypt_ctx;
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/*
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* The basic unit of block I/O is a sector. It is used in a number of contexts
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* in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9
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* bytes. Variables of type sector_t represent an offset or size that is a
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* multiple of 512 bytes. Hence these two constants.
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*/
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#ifndef SECTOR_SHIFT
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#define SECTOR_SHIFT 9
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#endif
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#ifndef SECTOR_SIZE
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#define SECTOR_SIZE (1 << SECTOR_SHIFT)
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#endif
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#define PAGE_SECTORS_SHIFT (PAGE_SHIFT - SECTOR_SHIFT)
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#define PAGE_SECTORS (1 << PAGE_SECTORS_SHIFT)
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#define SECTOR_MASK (PAGE_SECTORS - 1)
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struct block_device {
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sector_t bd_start_sect;
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sector_t bd_nr_sectors;
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struct gendisk * bd_disk;
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struct request_queue * bd_queue;
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struct disk_stats __percpu *bd_stats;
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unsigned long bd_stamp;
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bool bd_read_only; /* read-only policy */
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u8 bd_partno;
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bool bd_write_holder;
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bool bd_has_submit_bio;
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dev_t bd_dev;
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atomic_t bd_openers;
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spinlock_t bd_size_lock; /* for bd_inode->i_size updates */
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struct inode * bd_inode; /* will die */
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void * bd_claiming;
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void * bd_holder;
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const struct blk_holder_ops *bd_holder_ops;
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struct mutex bd_holder_lock;
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/* The counter of freeze processes */
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int bd_fsfreeze_count;
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int bd_holders;
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struct kobject *bd_holder_dir;
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/* Mutex for freeze */
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struct mutex bd_fsfreeze_mutex;
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struct super_block *bd_fsfreeze_sb;
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struct partition_meta_info *bd_meta_info;
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#ifdef CONFIG_FAIL_MAKE_REQUEST
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bool bd_make_it_fail;
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#endif
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/*
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* keep this out-of-line as it's both big and not needed in the fast
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* path
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*/
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struct device bd_device;
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} __randomize_layout;
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#define bdev_whole(_bdev) \
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((_bdev)->bd_disk->part0)
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#define dev_to_bdev(device) \
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container_of((device), struct block_device, bd_device)
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#define bdev_kobj(_bdev) \
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(&((_bdev)->bd_device.kobj))
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/*
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* Block error status values. See block/blk-core:blk_errors for the details.
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* Alpha cannot write a byte atomically, so we need to use 32-bit value.
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*/
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#if defined(CONFIG_ALPHA) && !defined(__alpha_bwx__)
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typedef u32 __bitwise blk_status_t;
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typedef u32 blk_short_t;
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#else
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typedef u8 __bitwise blk_status_t;
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typedef u16 blk_short_t;
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#endif
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#define BLK_STS_OK 0
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#define BLK_STS_NOTSUPP ((__force blk_status_t)1)
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#define BLK_STS_TIMEOUT ((__force blk_status_t)2)
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#define BLK_STS_NOSPC ((__force blk_status_t)3)
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#define BLK_STS_TRANSPORT ((__force blk_status_t)4)
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#define BLK_STS_TARGET ((__force blk_status_t)5)
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#define BLK_STS_RESV_CONFLICT ((__force blk_status_t)6)
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#define BLK_STS_MEDIUM ((__force blk_status_t)7)
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#define BLK_STS_PROTECTION ((__force blk_status_t)8)
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#define BLK_STS_RESOURCE ((__force blk_status_t)9)
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#define BLK_STS_IOERR ((__force blk_status_t)10)
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/* hack for device mapper, don't use elsewhere: */
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#define BLK_STS_DM_REQUEUE ((__force blk_status_t)11)
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/*
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* BLK_STS_AGAIN should only be returned if RQF_NOWAIT is set
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* and the bio would block (cf bio_wouldblock_error())
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*/
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#define BLK_STS_AGAIN ((__force blk_status_t)12)
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/*
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* BLK_STS_DEV_RESOURCE is returned from the driver to the block layer if
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* device related resources are unavailable, but the driver can guarantee
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* that the queue will be rerun in the future once resources become
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* available again. This is typically the case for device specific
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* resources that are consumed for IO. If the driver fails allocating these
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* resources, we know that inflight (or pending) IO will free these
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* resource upon completion.
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*
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* This is different from BLK_STS_RESOURCE in that it explicitly references
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* a device specific resource. For resources of wider scope, allocation
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* failure can happen without having pending IO. This means that we can't
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* rely on request completions freeing these resources, as IO may not be in
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* flight. Examples of that are kernel memory allocations, DMA mappings, or
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* any other system wide resources.
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*/
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#define BLK_STS_DEV_RESOURCE ((__force blk_status_t)13)
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/*
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* BLK_STS_ZONE_RESOURCE is returned from the driver to the block layer if zone
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* related resources are unavailable, but the driver can guarantee the queue
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* will be rerun in the future once the resources become available again.
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*
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* This is different from BLK_STS_DEV_RESOURCE in that it explicitly references
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* a zone specific resource and IO to a different zone on the same device could
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* still be served. Examples of that are zones that are write-locked, but a read
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* to the same zone could be served.
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*/
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#define BLK_STS_ZONE_RESOURCE ((__force blk_status_t)14)
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/*
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* BLK_STS_ZONE_OPEN_RESOURCE is returned from the driver in the completion
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* path if the device returns a status indicating that too many zone resources
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* are currently open. The same command should be successful if resubmitted
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* after the number of open zones decreases below the device's limits, which is
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* reported in the request_queue's max_open_zones.
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*/
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#define BLK_STS_ZONE_OPEN_RESOURCE ((__force blk_status_t)15)
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/*
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* BLK_STS_ZONE_ACTIVE_RESOURCE is returned from the driver in the completion
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* path if the device returns a status indicating that too many zone resources
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* are currently active. The same command should be successful if resubmitted
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* after the number of active zones decreases below the device's limits, which
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* is reported in the request_queue's max_active_zones.
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*/
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#define BLK_STS_ZONE_ACTIVE_RESOURCE ((__force blk_status_t)16)
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/*
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* BLK_STS_OFFLINE is returned from the driver when the target device is offline
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* or is being taken offline. This could help differentiate the case where a
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* device is intentionally being shut down from a real I/O error.
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*/
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#define BLK_STS_OFFLINE ((__force blk_status_t)17)
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/*
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* BLK_STS_DURATION_LIMIT is returned from the driver when the target device
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* aborted the command because it exceeded one of its Command Duration Limits.
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*/
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#define BLK_STS_DURATION_LIMIT ((__force blk_status_t)18)
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/**
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* blk_path_error - returns true if error may be path related
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* @error: status the request was completed with
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*
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* Description:
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* This classifies block error status into non-retryable errors and ones
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* that may be successful if retried on a failover path.
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*
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* Return:
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* %false - retrying failover path will not help
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* %true - may succeed if retried
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*/
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static inline bool blk_path_error(blk_status_t error)
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{
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switch (error) {
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case BLK_STS_NOTSUPP:
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case BLK_STS_NOSPC:
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case BLK_STS_TARGET:
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case BLK_STS_RESV_CONFLICT:
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case BLK_STS_MEDIUM:
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case BLK_STS_PROTECTION:
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return false;
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}
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/* Anything else could be a path failure, so should be retried */
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return true;
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}
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/*
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* From most significant bit:
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* 1 bit: reserved for other usage, see below
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* 12 bits: original size of bio
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* 51 bits: issue time of bio
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*/
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#define BIO_ISSUE_RES_BITS 1
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#define BIO_ISSUE_SIZE_BITS 12
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#define BIO_ISSUE_RES_SHIFT (64 - BIO_ISSUE_RES_BITS)
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#define BIO_ISSUE_SIZE_SHIFT (BIO_ISSUE_RES_SHIFT - BIO_ISSUE_SIZE_BITS)
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#define BIO_ISSUE_TIME_MASK ((1ULL << BIO_ISSUE_SIZE_SHIFT) - 1)
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#define BIO_ISSUE_SIZE_MASK \
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(((1ULL << BIO_ISSUE_SIZE_BITS) - 1) << BIO_ISSUE_SIZE_SHIFT)
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#define BIO_ISSUE_RES_MASK (~((1ULL << BIO_ISSUE_RES_SHIFT) - 1))
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/* Reserved bit for blk-throtl */
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#define BIO_ISSUE_THROTL_SKIP_LATENCY (1ULL << 63)
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struct bio_issue {
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u64 value;
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};
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static inline u64 __bio_issue_time(u64 time)
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{
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return time & BIO_ISSUE_TIME_MASK;
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}
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static inline u64 bio_issue_time(struct bio_issue *issue)
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{
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return __bio_issue_time(issue->value);
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}
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static inline sector_t bio_issue_size(struct bio_issue *issue)
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{
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return ((issue->value & BIO_ISSUE_SIZE_MASK) >> BIO_ISSUE_SIZE_SHIFT);
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}
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static inline void bio_issue_init(struct bio_issue *issue,
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sector_t size)
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{
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size &= (1ULL << BIO_ISSUE_SIZE_BITS) - 1;
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issue->value = ((issue->value & BIO_ISSUE_RES_MASK) |
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(ktime_get_ns() & BIO_ISSUE_TIME_MASK) |
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((u64)size << BIO_ISSUE_SIZE_SHIFT));
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}
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typedef __u32 __bitwise blk_opf_t;
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typedef unsigned int blk_qc_t;
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#define BLK_QC_T_NONE -1U
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/*
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* main unit of I/O for the block layer and lower layers (ie drivers and
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* stacking drivers)
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*/
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struct bio {
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struct bio *bi_next; /* request queue link */
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struct block_device *bi_bdev;
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blk_opf_t bi_opf; /* bottom bits REQ_OP, top bits
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* req_flags.
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*/
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unsigned short bi_flags; /* BIO_* below */
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unsigned short bi_ioprio;
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blk_status_t bi_status;
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atomic_t __bi_remaining;
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struct bvec_iter bi_iter;
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blk_qc_t bi_cookie;
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bio_end_io_t *bi_end_io;
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void *bi_private;
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#ifdef CONFIG_BLK_CGROUP
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/*
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* Represents the association of the css and request_queue for the bio.
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* If a bio goes direct to device, it will not have a blkg as it will
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* not have a request_queue associated with it. The reference is put
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* on release of the bio.
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*/
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struct blkcg_gq *bi_blkg;
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struct bio_issue bi_issue;
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#ifdef CONFIG_BLK_CGROUP_IOCOST
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u64 bi_iocost_cost;
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#endif
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#endif
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#ifdef CONFIG_BLK_INLINE_ENCRYPTION
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struct bio_crypt_ctx *bi_crypt_context;
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#endif
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union {
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#if defined(CONFIG_BLK_DEV_INTEGRITY)
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struct bio_integrity_payload *bi_integrity; /* data integrity */
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#endif
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};
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unsigned short bi_vcnt; /* how many bio_vec's */
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/*
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* Everything starting with bi_max_vecs will be preserved by bio_reset()
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*/
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unsigned short bi_max_vecs; /* max bvl_vecs we can hold */
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atomic_t __bi_cnt; /* pin count */
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struct bio_vec *bi_io_vec; /* the actual vec list */
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struct bio_set *bi_pool;
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/*
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* We can inline a number of vecs at the end of the bio, to avoid
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* double allocations for a small number of bio_vecs. This member
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* MUST obviously be kept at the very end of the bio.
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*/
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struct bio_vec bi_inline_vecs[];
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};
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#define BIO_RESET_BYTES offsetof(struct bio, bi_max_vecs)
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#define BIO_MAX_SECTORS (UINT_MAX >> SECTOR_SHIFT)
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/*
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* bio flags
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*/
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enum {
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BIO_PAGE_PINNED, /* Unpin pages in bio_release_pages() */
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BIO_CLONED, /* doesn't own data */
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BIO_BOUNCED, /* bio is a bounce bio */
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BIO_QUIET, /* Make BIO Quiet */
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BIO_CHAIN, /* chained bio, ->bi_remaining in effect */
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BIO_REFFED, /* bio has elevated ->bi_cnt */
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BIO_BPS_THROTTLED, /* This bio has already been subjected to
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* throttling rules. Don't do it again. */
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BIO_TRACE_COMPLETION, /* bio_endio() should trace the final completion
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* of this bio. */
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BIO_CGROUP_ACCT, /* has been accounted to a cgroup */
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BIO_QOS_THROTTLED, /* bio went through rq_qos throttle path */
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BIO_QOS_MERGED, /* but went through rq_qos merge path */
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BIO_REMAPPED,
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BIO_ZONE_WRITE_LOCKED, /* Owns a zoned device zone write lock */
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BIO_FLAG_LAST
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};
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typedef __u32 __bitwise blk_mq_req_flags_t;
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#define REQ_OP_BITS 8
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#define REQ_OP_MASK (__force blk_opf_t)((1 << REQ_OP_BITS) - 1)
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#define REQ_FLAG_BITS 24
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/**
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* enum req_op - Operations common to the bio and request structures.
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* We use 8 bits for encoding the operation, and the remaining 24 for flags.
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*
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* The least significant bit of the operation number indicates the data
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* transfer direction:
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*
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* - if the least significant bit is set transfers are TO the device
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* - if the least significant bit is not set transfers are FROM the device
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*
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* If a operation does not transfer data the least significant bit has no
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* meaning.
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*/
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enum req_op {
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/* read sectors from the device */
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REQ_OP_READ = (__force blk_opf_t)0,
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/* write sectors to the device */
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REQ_OP_WRITE = (__force blk_opf_t)1,
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/* flush the volatile write cache */
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REQ_OP_FLUSH = (__force blk_opf_t)2,
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/* discard sectors */
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REQ_OP_DISCARD = (__force blk_opf_t)3,
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/* securely erase sectors */
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REQ_OP_SECURE_ERASE = (__force blk_opf_t)5,
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/* write the zero filled sector many times */
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REQ_OP_WRITE_ZEROES = (__force blk_opf_t)9,
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/* Open a zone */
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REQ_OP_ZONE_OPEN = (__force blk_opf_t)10,
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/* Close a zone */
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REQ_OP_ZONE_CLOSE = (__force blk_opf_t)11,
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/* Transition a zone to full */
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REQ_OP_ZONE_FINISH = (__force blk_opf_t)12,
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/* write data at the current zone write pointer */
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REQ_OP_ZONE_APPEND = (__force blk_opf_t)13,
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/* reset a zone write pointer */
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REQ_OP_ZONE_RESET = (__force blk_opf_t)15,
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/* reset all the zone present on the device */
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REQ_OP_ZONE_RESET_ALL = (__force blk_opf_t)17,
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/* Driver private requests */
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REQ_OP_DRV_IN = (__force blk_opf_t)34,
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REQ_OP_DRV_OUT = (__force blk_opf_t)35,
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REQ_OP_LAST = (__force blk_opf_t)36,
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};
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enum req_flag_bits {
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__REQ_FAILFAST_DEV = /* no driver retries of device errors */
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REQ_OP_BITS,
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__REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */
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__REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */
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__REQ_SYNC, /* request is sync (sync write or read) */
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__REQ_META, /* metadata io request */
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__REQ_PRIO, /* boost priority in cfq */
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__REQ_NOMERGE, /* don't touch this for merging */
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__REQ_IDLE, /* anticipate more IO after this one */
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__REQ_INTEGRITY, /* I/O includes block integrity payload */
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__REQ_FUA, /* forced unit access */
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__REQ_PREFLUSH, /* request for cache flush */
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__REQ_RAHEAD, /* read ahead, can fail anytime */
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__REQ_BACKGROUND, /* background IO */
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__REQ_NOWAIT, /* Don't wait if request will block */
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__REQ_POLLED, /* caller polls for completion using bio_poll */
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__REQ_ALLOC_CACHE, /* allocate IO from cache if available */
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__REQ_SWAP, /* swap I/O */
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__REQ_DRV, /* for driver use */
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__REQ_FS_PRIVATE, /* for file system (submitter) use */
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/*
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* Command specific flags, keep last:
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*/
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/* for REQ_OP_WRITE_ZEROES: */
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__REQ_NOUNMAP, /* do not free blocks when zeroing */
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__REQ_NR_BITS, /* stops here */
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};
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#define REQ_FAILFAST_DEV \
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(__force blk_opf_t)(1ULL << __REQ_FAILFAST_DEV)
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#define REQ_FAILFAST_TRANSPORT \
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(__force blk_opf_t)(1ULL << __REQ_FAILFAST_TRANSPORT)
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#define REQ_FAILFAST_DRIVER \
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(__force blk_opf_t)(1ULL << __REQ_FAILFAST_DRIVER)
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#define REQ_SYNC (__force blk_opf_t)(1ULL << __REQ_SYNC)
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#define REQ_META (__force blk_opf_t)(1ULL << __REQ_META)
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#define REQ_PRIO (__force blk_opf_t)(1ULL << __REQ_PRIO)
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#define REQ_NOMERGE (__force blk_opf_t)(1ULL << __REQ_NOMERGE)
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#define REQ_IDLE (__force blk_opf_t)(1ULL << __REQ_IDLE)
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#define REQ_INTEGRITY (__force blk_opf_t)(1ULL << __REQ_INTEGRITY)
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#define REQ_FUA (__force blk_opf_t)(1ULL << __REQ_FUA)
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#define REQ_PREFLUSH (__force blk_opf_t)(1ULL << __REQ_PREFLUSH)
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#define REQ_RAHEAD (__force blk_opf_t)(1ULL << __REQ_RAHEAD)
|
|
#define REQ_BACKGROUND (__force blk_opf_t)(1ULL << __REQ_BACKGROUND)
|
|
#define REQ_NOWAIT (__force blk_opf_t)(1ULL << __REQ_NOWAIT)
|
|
#define REQ_POLLED (__force blk_opf_t)(1ULL << __REQ_POLLED)
|
|
#define REQ_ALLOC_CACHE (__force blk_opf_t)(1ULL << __REQ_ALLOC_CACHE)
|
|
#define REQ_SWAP (__force blk_opf_t)(1ULL << __REQ_SWAP)
|
|
#define REQ_DRV (__force blk_opf_t)(1ULL << __REQ_DRV)
|
|
#define REQ_FS_PRIVATE (__force blk_opf_t)(1ULL << __REQ_FS_PRIVATE)
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|
|
|
#define REQ_NOUNMAP (__force blk_opf_t)(1ULL << __REQ_NOUNMAP)
|
|
|
|
#define REQ_FAILFAST_MASK \
|
|
(REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER)
|
|
|
|
#define REQ_NOMERGE_FLAGS \
|
|
(REQ_NOMERGE | REQ_PREFLUSH | REQ_FUA)
|
|
|
|
enum stat_group {
|
|
STAT_READ,
|
|
STAT_WRITE,
|
|
STAT_DISCARD,
|
|
STAT_FLUSH,
|
|
|
|
NR_STAT_GROUPS
|
|
};
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|
|
|
static inline enum req_op bio_op(const struct bio *bio)
|
|
{
|
|
return bio->bi_opf & REQ_OP_MASK;
|
|
}
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|
|
|
static inline bool op_is_write(blk_opf_t op)
|
|
{
|
|
return !!(op & (__force blk_opf_t)1);
|
|
}
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|
|
|
/*
|
|
* Check if the bio or request is one that needs special treatment in the
|
|
* flush state machine.
|
|
*/
|
|
static inline bool op_is_flush(blk_opf_t op)
|
|
{
|
|
return op & (REQ_FUA | REQ_PREFLUSH);
|
|
}
|
|
|
|
/*
|
|
* Reads are always treated as synchronous, as are requests with the FUA or
|
|
* PREFLUSH flag. Other operations may be marked as synchronous using the
|
|
* REQ_SYNC flag.
|
|
*/
|
|
static inline bool op_is_sync(blk_opf_t op)
|
|
{
|
|
return (op & REQ_OP_MASK) == REQ_OP_READ ||
|
|
(op & (REQ_SYNC | REQ_FUA | REQ_PREFLUSH));
|
|
}
|
|
|
|
static inline bool op_is_discard(blk_opf_t op)
|
|
{
|
|
return (op & REQ_OP_MASK) == REQ_OP_DISCARD;
|
|
}
|
|
|
|
/*
|
|
* Check if a bio or request operation is a zone management operation, with
|
|
* the exception of REQ_OP_ZONE_RESET_ALL which is treated as a special case
|
|
* due to its different handling in the block layer and device response in
|
|
* case of command failure.
|
|
*/
|
|
static inline bool op_is_zone_mgmt(enum req_op op)
|
|
{
|
|
switch (op & REQ_OP_MASK) {
|
|
case REQ_OP_ZONE_RESET:
|
|
case REQ_OP_ZONE_OPEN:
|
|
case REQ_OP_ZONE_CLOSE:
|
|
case REQ_OP_ZONE_FINISH:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static inline int op_stat_group(enum req_op op)
|
|
{
|
|
if (op_is_discard(op))
|
|
return STAT_DISCARD;
|
|
return op_is_write(op);
|
|
}
|
|
|
|
struct blk_rq_stat {
|
|
u64 mean;
|
|
u64 min;
|
|
u64 max;
|
|
u32 nr_samples;
|
|
u64 batch;
|
|
};
|
|
|
|
#endif /* __LINUX_BLK_TYPES_H */
|