linux-imx

/* SPDX-License-Identifier: GPL-2.0 */

/*

 * Copyright (C) 2007 Oracle.  All rights reserved.

 */

​

#ifndef BTRFS_VOLUMES_H

#define BTRFS_VOLUMES_H

​

#include <linux/bio.h>

#include <linux/sort.h>

#include <linux/btrfs.h>

#include "async-thread.h"

​

#define BTRFS_MAX_DATA_CHUNK_SIZE   (10ULL * SZ_1G)

​

extern struct mutex uuid_mutex;

​

#define BTRFS_STRIPE_LEN    SZ_64K

​

struct buffer_head;

struct btrfs_pending_bios {

    struct bio *head;

    struct bio *tail;

};

​

/*

 * Use sequence counter to get consistent device stat data on

 * 32-bit processors.

 */

#if BITS_PER_LONG==32 && defined(CONFIG_SMP)

#include <linux/seqlock.h>

#define __BTRFS_NEED_DEVICE_DATA_ORDERED

#define btrfs_device_data_ordered_init(device)  \

    seqcount_init(&device->data_seqcount)

#else

#define btrfs_device_data_ordered_init(device) do { } while (0)

#endif

​

#define BTRFS_DEV_STATE_WRITEABLE   (0)

#define BTRFS_DEV_STATE_IN_FS_METADATA  (1)

#define BTRFS_DEV_STATE_MISSING     (2)

#define BTRFS_DEV_STATE_REPLACE_TGT (3)

#define BTRFS_DEV_STATE_FLUSH_SENT  (4)

​

struct btrfs_device {

    struct list_head dev_list;

    struct list_head dev_alloc_list;

    struct btrfs_fs_devices *fs_devices;

    struct btrfs_fs_info *fs_info;

​

    struct rcu_string *name;

​

    u64 generation;

​

    spinlock_t io_lock ____cacheline_aligned;

    int running_pending;

    /* regular prio bios */

    struct btrfs_pending_bios pending_bios;

    /* sync bios */

    struct btrfs_pending_bios pending_sync_bios;

​

    struct block_device *bdev;

​

    /* the mode sent to blkdev_get */

    fmode_t mode;

​

    unsigned long dev_state;

    blk_status_t last_flush_error;

    int flush_bio_sent;

​

#ifdef __BTRFS_NEED_DEVICE_DATA_ORDERED

    seqcount_t data_seqcount;

#endif

​

    /* the internal btrfs device id */

    u64 devid;

​

    /* size of the device in memory */

    u64 total_bytes;

​

    /* size of the device on disk */

    u64 disk_total_bytes;

​

    /* bytes used */

    u64 bytes_used;

​

    /* optimal io alignment for this device */

    u32 io_align;

​

    /* optimal io width for this device */

    u32 io_width;

    /* type and info about this device */