mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
![Anand Jain](/assets/img/avatar_default.png)
In some cases, we need to read the FSID from the superblock when the metadata_uuid is not set, and otherwise, read the metadata_uuid. So, add a helper. Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Tested-by: Guilherme G. Piccoli <gpiccoli@igalia.com> Signed-off-by: Anand Jain <anand.jain@oracle.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
752 lines
22 KiB
C
752 lines
22 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Copyright (C) 2007 Oracle. All rights reserved.
|
|
*/
|
|
|
|
#ifndef BTRFS_VOLUMES_H
|
|
#define BTRFS_VOLUMES_H
|
|
|
|
#include <linux/sort.h>
|
|
#include <linux/btrfs.h>
|
|
#include "async-thread.h"
|
|
#include "messages.h"
|
|
#include "tree-checker.h"
|
|
#include "rcu-string.h"
|
|
|
|
#define BTRFS_MAX_DATA_CHUNK_SIZE (10ULL * SZ_1G)
|
|
|
|
extern struct mutex uuid_mutex;
|
|
|
|
#define BTRFS_STRIPE_LEN SZ_64K
|
|
#define BTRFS_STRIPE_LEN_SHIFT (16)
|
|
#define BTRFS_STRIPE_LEN_MASK (BTRFS_STRIPE_LEN - 1)
|
|
|
|
static_assert(const_ilog2(BTRFS_STRIPE_LEN) == BTRFS_STRIPE_LEN_SHIFT);
|
|
|
|
/* Used by sanity check for btrfs_raid_types. */
|
|
#define const_ffs(n) (__builtin_ctzll(n) + 1)
|
|
|
|
/*
|
|
* The conversion from BTRFS_BLOCK_GROUP_* bits to btrfs_raid_type requires
|
|
* RAID0 always to be the lowest profile bit.
|
|
* Although it's part of on-disk format and should never change, do extra
|
|
* compile-time sanity checks.
|
|
*/
|
|
static_assert(const_ffs(BTRFS_BLOCK_GROUP_RAID0) <
|
|
const_ffs(BTRFS_BLOCK_GROUP_PROFILE_MASK & ~BTRFS_BLOCK_GROUP_RAID0));
|
|
static_assert(const_ilog2(BTRFS_BLOCK_GROUP_RAID0) >
|
|
ilog2(BTRFS_BLOCK_GROUP_TYPE_MASK));
|
|
|
|
/* ilog2() can handle both constants and variables */
|
|
#define BTRFS_BG_FLAG_TO_INDEX(profile) \
|
|
ilog2((profile) >> (ilog2(BTRFS_BLOCK_GROUP_RAID0) - 1))
|
|
|
|
enum btrfs_raid_types {
|
|
/* SINGLE is the special one as it doesn't have on-disk bit. */
|
|
BTRFS_RAID_SINGLE = 0,
|
|
|
|
BTRFS_RAID_RAID0 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID0),
|
|
BTRFS_RAID_RAID1 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1),
|
|
BTRFS_RAID_DUP = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_DUP),
|
|
BTRFS_RAID_RAID10 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID10),
|
|
BTRFS_RAID_RAID5 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID5),
|
|
BTRFS_RAID_RAID6 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID6),
|
|
BTRFS_RAID_RAID1C3 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1C3),
|
|
BTRFS_RAID_RAID1C4 = BTRFS_BG_FLAG_TO_INDEX(BTRFS_BLOCK_GROUP_RAID1C4),
|
|
|
|
BTRFS_NR_RAID_TYPES
|
|
};
|
|
|
|
/*
|
|
* 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)
|
|
#define BTRFS_DEV_STATE_NO_READA (5)
|
|
|
|
struct btrfs_zoned_device_info;
|
|
|
|
struct btrfs_device {
|
|
struct list_head dev_list; /* device_list_mutex */
|
|
struct list_head dev_alloc_list; /* chunk mutex */
|
|
struct list_head post_commit_list; /* chunk mutex */
|
|
struct btrfs_fs_devices *fs_devices;
|
|
struct btrfs_fs_info *fs_info;
|
|
|
|
struct rcu_string __rcu *name;
|
|
|
|
u64 generation;
|
|
|
|
struct block_device *bdev;
|
|
|
|
struct btrfs_zoned_device_info *zone_info;
|
|
|
|
/* block device holder for blkdev_get/put */
|
|
void *holder;
|
|
|
|
/*
|
|
* Device's major-minor number. Must be set even if the device is not
|
|
* opened (bdev == NULL), unless the device is missing.
|
|
*/
|
|
dev_t devt;
|
|
unsigned long dev_state;
|
|
blk_status_t last_flush_error;
|
|
|
|
#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 */
|
|
u64 type;
|
|
|
|
/* minimal io size for this device */
|
|
u32 sector_size;
|
|
|
|
/* physical drive uuid (or lvm uuid) */
|
|
u8 uuid[BTRFS_UUID_SIZE];
|
|
|
|
/*
|
|
* size of the device on the current transaction
|
|
*
|
|
* This variant is update when committing the transaction,
|
|
* and protected by chunk mutex
|
|
*/
|
|
u64 commit_total_bytes;
|
|
|
|
/* bytes used on the current transaction */
|
|
u64 commit_bytes_used;
|
|
|
|
/* Bio used for flushing device barriers */
|
|
struct bio flush_bio;
|
|
struct completion flush_wait;
|
|
|
|
/* per-device scrub information */
|
|
struct scrub_ctx *scrub_ctx;
|
|
|
|
/* disk I/O failure stats. For detailed description refer to
|
|
* enum btrfs_dev_stat_values in ioctl.h */
|
|
int dev_stats_valid;
|
|
|
|
/* Counter to record the change of device stats */
|
|
atomic_t dev_stats_ccnt;
|
|
atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
|
|
|
|
struct extent_io_tree alloc_state;
|
|
|
|
struct completion kobj_unregister;
|
|
/* For sysfs/FSID/devinfo/devid/ */
|
|
struct kobject devid_kobj;
|
|
|
|
/* Bandwidth limit for scrub, in bytes */
|
|
u64 scrub_speed_max;
|
|
};
|
|
|
|
/*
|
|
* Block group or device which contains an active swapfile. Used for preventing
|
|
* unsafe operations while a swapfile is active.
|
|
*
|
|
* These are sorted on (ptr, inode) (note that a block group or device can
|
|
* contain more than one swapfile). We compare the pointer values because we
|
|
* don't actually care what the object is, we just need a quick check whether
|
|
* the object exists in the rbtree.
|
|
*/
|
|
struct btrfs_swapfile_pin {
|
|
struct rb_node node;
|
|
void *ptr;
|
|
struct inode *inode;
|
|
/*
|
|
* If true, ptr points to a struct btrfs_block_group. Otherwise, ptr
|
|
* points to a struct btrfs_device.
|
|
*/
|
|
bool is_block_group;
|
|
/*
|
|
* Only used when 'is_block_group' is true and it is the number of
|
|
* extents used by a swapfile for this block group ('ptr' field).
|
|
*/
|
|
int bg_extent_count;
|
|
};
|
|
|
|
/*
|
|
* If we read those variants at the context of their own lock, we needn't
|
|
* use the following helpers, reading them directly is safe.
|
|
*/
|
|
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
|
|
#define BTRFS_DEVICE_GETSET_FUNCS(name) \
|
|
static inline u64 \
|
|
btrfs_device_get_##name(const struct btrfs_device *dev) \
|
|
{ \
|
|
u64 size; \
|
|
unsigned int seq; \
|
|
\
|
|
do { \
|
|
seq = read_seqcount_begin(&dev->data_seqcount); \
|
|
size = dev->name; \
|
|
} while (read_seqcount_retry(&dev->data_seqcount, seq)); \
|
|
return size; \
|
|
} \
|
|
\
|
|
static inline void \
|
|
btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
|
|
{ \
|
|
preempt_disable(); \
|
|
write_seqcount_begin(&dev->data_seqcount); \
|
|
dev->name = size; \
|
|
write_seqcount_end(&dev->data_seqcount); \
|
|
preempt_enable(); \
|
|
}
|
|
#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
|
|
#define BTRFS_DEVICE_GETSET_FUNCS(name) \
|
|
static inline u64 \
|
|
btrfs_device_get_##name(const struct btrfs_device *dev) \
|
|
{ \
|
|
u64 size; \
|
|
\
|
|
preempt_disable(); \
|
|
size = dev->name; \
|
|
preempt_enable(); \
|
|
return size; \
|
|
} \
|
|
\
|
|
static inline void \
|
|
btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
|
|
{ \
|
|
preempt_disable(); \
|
|
dev->name = size; \
|
|
preempt_enable(); \
|
|
}
|
|
#else
|
|
#define BTRFS_DEVICE_GETSET_FUNCS(name) \
|
|
static inline u64 \
|
|
btrfs_device_get_##name(const struct btrfs_device *dev) \
|
|
{ \
|
|
return dev->name; \
|
|
} \
|
|
\
|
|
static inline void \
|
|
btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \
|
|
{ \
|
|
dev->name = size; \
|
|
}
|
|
#endif
|
|
|
|
BTRFS_DEVICE_GETSET_FUNCS(total_bytes);
|
|
BTRFS_DEVICE_GETSET_FUNCS(disk_total_bytes);
|
|
BTRFS_DEVICE_GETSET_FUNCS(bytes_used);
|
|
|
|
enum btrfs_chunk_allocation_policy {
|
|
BTRFS_CHUNK_ALLOC_REGULAR,
|
|
BTRFS_CHUNK_ALLOC_ZONED,
|
|
};
|
|
|
|
/*
|
|
* Read policies for mirrored block group profiles, read picks the stripe based
|
|
* on these policies.
|
|
*/
|
|
enum btrfs_read_policy {
|
|
/* Use process PID to choose the stripe */
|
|
BTRFS_READ_POLICY_PID,
|
|
BTRFS_NR_READ_POLICY,
|
|
};
|
|
|
|
struct btrfs_fs_devices {
|
|
u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
|
|
|
|
/*
|
|
* UUID written into the btree blocks:
|
|
*
|
|
* - If metadata_uuid != fsid then super block must have
|
|
* BTRFS_FEATURE_INCOMPAT_METADATA_UUID flag set.
|
|
*
|
|
* - Following shall be true at all times:
|
|
* - metadata_uuid == btrfs_header::fsid
|
|
* - metadata_uuid == btrfs_dev_item::fsid
|
|
*/
|
|
u8 metadata_uuid[BTRFS_FSID_SIZE];
|
|
|
|
struct list_head fs_list;
|
|
|
|
/*
|
|
* Number of devices under this fsid including missing and
|
|
* replace-target device and excludes seed devices.
|
|
*/
|
|
u64 num_devices;
|
|
|
|
/*
|
|
* The number of devices that successfully opened, including
|
|
* replace-target, excludes seed devices.
|
|
*/
|
|
u64 open_devices;
|
|
|
|
/* The number of devices that are under the chunk allocation list. */
|
|
u64 rw_devices;
|
|
|
|
/* Count of missing devices under this fsid excluding seed device. */
|
|
u64 missing_devices;
|
|
u64 total_rw_bytes;
|
|
|
|
/*
|
|
* Count of devices from btrfs_super_block::num_devices for this fsid,
|
|
* which includes the seed device, excludes the transient replace-target
|
|
* device.
|
|
*/
|
|
u64 total_devices;
|
|
|
|
/* Highest generation number of seen devices */
|
|
u64 latest_generation;
|
|
|
|
/*
|
|
* The mount device or a device with highest generation after removal
|
|
* or replace.
|
|
*/
|
|
struct btrfs_device *latest_dev;
|
|
|
|
/*
|
|
* All of the devices in the filesystem, protected by a mutex so we can
|
|
* safely walk it to write out the super blocks without worrying about
|
|
* adding/removing by the multi-device code. Scrubbing super block can
|
|
* kick off supers writing by holding this mutex lock.
|
|
*/
|
|
struct mutex device_list_mutex;
|
|
|
|
/* List of all devices, protected by device_list_mutex */
|
|
struct list_head devices;
|
|
|
|
/* Devices which can satisfy space allocation. Protected by * chunk_mutex. */
|
|
struct list_head alloc_list;
|
|
|
|
struct list_head seed_list;
|
|
|
|
/* Count fs-devices opened. */
|
|
int opened;
|
|
|
|
/* Set when we find or add a device that doesn't have the nonrot flag set. */
|
|
bool rotating;
|
|
/* Devices support TRIM/discard commands. */
|
|
bool discardable;
|
|
bool fsid_change;
|
|
/* The filesystem is a seed filesystem. */
|
|
bool seeding;
|
|
|
|
struct btrfs_fs_info *fs_info;
|
|
/* sysfs kobjects */
|
|
struct kobject fsid_kobj;
|
|
struct kobject *devices_kobj;
|
|
struct kobject *devinfo_kobj;
|
|
struct completion kobj_unregister;
|
|
|
|
enum btrfs_chunk_allocation_policy chunk_alloc_policy;
|
|
|
|
/* Policy used to read the mirrored stripes. */
|
|
enum btrfs_read_policy read_policy;
|
|
};
|
|
|
|
#define BTRFS_MAX_DEVS(info) ((BTRFS_MAX_ITEM_SIZE(info) \
|
|
- sizeof(struct btrfs_chunk)) \
|
|
/ sizeof(struct btrfs_stripe) + 1)
|
|
|
|
#define BTRFS_MAX_DEVS_SYS_CHUNK ((BTRFS_SYSTEM_CHUNK_ARRAY_SIZE \
|
|
- 2 * sizeof(struct btrfs_disk_key) \
|
|
- 2 * sizeof(struct btrfs_chunk)) \
|
|
/ sizeof(struct btrfs_stripe) + 1)
|
|
|
|
struct btrfs_io_stripe {
|
|
struct btrfs_device *dev;
|
|
union {
|
|
/* Block mapping */
|
|
u64 physical;
|
|
/* For the endio handler */
|
|
struct btrfs_io_context *bioc;
|
|
};
|
|
};
|
|
|
|
struct btrfs_discard_stripe {
|
|
struct btrfs_device *dev;
|
|
u64 physical;
|
|
u64 length;
|
|
};
|
|
|
|
/*
|
|
* Context for IO subsmission for device stripe.
|
|
*
|
|
* - Track the unfinished mirrors for mirror based profiles
|
|
* Mirror based profiles are SINGLE/DUP/RAID1/RAID10.
|
|
*
|
|
* - Contain the logical -> physical mapping info
|
|
* Used by submit_stripe_bio() for mapping logical bio
|
|
* into physical device address.
|
|
*
|
|
* - Contain device replace info
|
|
* Used by handle_ops_on_dev_replace() to copy logical bios
|
|
* into the new device.
|
|
*
|
|
* - Contain RAID56 full stripe logical bytenrs
|
|
*/
|
|
struct btrfs_io_context {
|
|
refcount_t refs;
|
|
struct btrfs_fs_info *fs_info;
|
|
u64 map_type; /* get from map_lookup->type */
|
|
struct bio *orig_bio;
|
|
atomic_t error;
|
|
u16 max_errors;
|
|
|
|
/*
|
|
* The total number of stripes, including the extra duplicated
|
|
* stripe for replace.
|
|
*/
|
|
u16 num_stripes;
|
|
|
|
/*
|
|
* The mirror_num of this bioc.
|
|
*
|
|
* This is for reads which use 0 as mirror_num, thus we should return a
|
|
* valid mirror_num (>0) for the reader.
|
|
*/
|
|
u16 mirror_num;
|
|
|
|
/*
|
|
* The following two members are for dev-replace case only.
|
|
*
|
|
* @replace_nr_stripes: Number of duplicated stripes which need to be
|
|
* written to replace target.
|
|
* Should be <= 2 (2 for DUP, otherwise <= 1).
|
|
* @replace_stripe_src: The array indicates where the duplicated stripes
|
|
* are from.
|
|
*
|
|
* The @replace_stripe_src[] array is mostly for RAID56 cases.
|
|
* As non-RAID56 stripes share the same contents of the mapped range,
|
|
* thus no need to bother where the duplicated ones are from.
|
|
*
|
|
* But for RAID56 case, all stripes contain different contents, thus
|
|
* we need a way to know the mapping.
|
|
*
|
|
* There is an example for the two members, using a RAID5 write:
|
|
*
|
|
* num_stripes: 4 (3 + 1 duplicated write)
|
|
* stripes[0]: dev = devid 1, physical = X
|
|
* stripes[1]: dev = devid 2, physical = Y
|
|
* stripes[2]: dev = devid 3, physical = Z
|
|
* stripes[3]: dev = devid 0, physical = Y
|
|
*
|
|
* replace_nr_stripes = 1
|
|
* replace_stripe_src = 1 <- Means stripes[1] is involved in replace.
|
|
* The duplicated stripe index would be
|
|
* (@num_stripes - 1).
|
|
*
|
|
* Note, that we can still have cases replace_nr_stripes = 2 for DUP.
|
|
* In that case, all stripes share the same content, thus we don't
|
|
* need to bother @replace_stripe_src value at all.
|
|
*/
|
|
u16 replace_nr_stripes;
|
|
s16 replace_stripe_src;
|
|
/*
|
|
* Logical bytenr of the full stripe start, only for RAID56 cases.
|
|
*
|
|
* When this value is set to other than (u64)-1, the stripes[] should
|
|
* follow this pattern:
|
|
*
|
|
* (real_stripes = num_stripes - replace_nr_stripes)
|
|
* (data_stripes = (is_raid6) ? (real_stripes - 2) : (real_stripes - 1))
|
|
*
|
|
* stripes[0]: The first data stripe
|
|
* stripes[1]: The second data stripe
|
|
* ...
|
|
* stripes[data_stripes - 1]: The last data stripe
|
|
* stripes[data_stripes]: The P stripe
|
|
* stripes[data_stripes + 1]: The Q stripe (only for RAID6).
|
|
*/
|
|
u64 full_stripe_logical;
|
|
struct btrfs_io_stripe stripes[];
|
|
};
|
|
|
|
struct btrfs_device_info {
|
|
struct btrfs_device *dev;
|
|
u64 dev_offset;
|
|
u64 max_avail;
|
|
u64 total_avail;
|
|
};
|
|
|
|
struct btrfs_raid_attr {
|
|
u8 sub_stripes; /* sub_stripes info for map */
|
|
u8 dev_stripes; /* stripes per dev */
|
|
u8 devs_max; /* max devs to use */
|
|
u8 devs_min; /* min devs needed */
|
|
u8 tolerated_failures; /* max tolerated fail devs */
|
|
u8 devs_increment; /* ndevs has to be a multiple of this */
|
|
u8 ncopies; /* how many copies to data has */
|
|
u8 nparity; /* number of stripes worth of bytes to store
|
|
* parity information */
|
|
u8 mindev_error; /* error code if min devs requisite is unmet */
|
|
const char raid_name[8]; /* name of the raid */
|
|
u64 bg_flag; /* block group flag of the raid */
|
|
};
|
|
|
|
extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES];
|
|
|
|
struct map_lookup {
|
|
u64 type;
|
|
int io_align;
|
|
int io_width;
|
|
int num_stripes;
|
|
int sub_stripes;
|
|
int verified_stripes; /* For mount time dev extent verification */
|
|
struct btrfs_io_stripe stripes[];
|
|
};
|
|
|
|
#define map_lookup_size(n) (sizeof(struct map_lookup) + \
|
|
(sizeof(struct btrfs_io_stripe) * (n)))
|
|
|
|
struct btrfs_balance_args;
|
|
struct btrfs_balance_progress;
|
|
struct btrfs_balance_control {
|
|
struct btrfs_balance_args data;
|
|
struct btrfs_balance_args meta;
|
|
struct btrfs_balance_args sys;
|
|
|
|
u64 flags;
|
|
|
|
struct btrfs_balance_progress stat;
|
|
};
|
|
|
|
/*
|
|
* Search for a given device by the set parameters
|
|
*/
|
|
struct btrfs_dev_lookup_args {
|
|
u64 devid;
|
|
u8 *uuid;
|
|
u8 *fsid;
|
|
bool missing;
|
|
};
|
|
|
|
/* We have to initialize to -1 because BTRFS_DEV_REPLACE_DEVID is 0 */
|
|
#define BTRFS_DEV_LOOKUP_ARGS_INIT { .devid = (u64)-1 }
|
|
|
|
#define BTRFS_DEV_LOOKUP_ARGS(name) \
|
|
struct btrfs_dev_lookup_args name = BTRFS_DEV_LOOKUP_ARGS_INIT
|
|
|
|
enum btrfs_map_op {
|
|
BTRFS_MAP_READ,
|
|
BTRFS_MAP_WRITE,
|
|
BTRFS_MAP_GET_READ_MIRRORS,
|
|
};
|
|
|
|
static inline enum btrfs_map_op btrfs_op(struct bio *bio)
|
|
{
|
|
switch (bio_op(bio)) {
|
|
case REQ_OP_WRITE:
|
|
case REQ_OP_ZONE_APPEND:
|
|
return BTRFS_MAP_WRITE;
|
|
default:
|
|
WARN_ON_ONCE(1);
|
|
fallthrough;
|
|
case REQ_OP_READ:
|
|
return BTRFS_MAP_READ;
|
|
}
|
|
}
|
|
|
|
static inline unsigned long btrfs_chunk_item_size(int num_stripes)
|
|
{
|
|
ASSERT(num_stripes);
|
|
return sizeof(struct btrfs_chunk) +
|
|
sizeof(struct btrfs_stripe) * (num_stripes - 1);
|
|
}
|
|
|
|
/*
|
|
* Do the type safe converstion from stripe_nr to offset inside the chunk.
|
|
*
|
|
* @stripe_nr is u32, with left shift it can overflow u32 for chunks larger
|
|
* than 4G. This does the proper type cast to avoid overflow.
|
|
*/
|
|
static inline u64 btrfs_stripe_nr_to_offset(u32 stripe_nr)
|
|
{
|
|
return (u64)stripe_nr << BTRFS_STRIPE_LEN_SHIFT;
|
|
}
|
|
|
|
void btrfs_get_bioc(struct btrfs_io_context *bioc);
|
|
void btrfs_put_bioc(struct btrfs_io_context *bioc);
|
|
int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
|
|
u64 logical, u64 *length,
|
|
struct btrfs_io_context **bioc_ret,
|
|
struct btrfs_io_stripe *smap, int *mirror_num_ret,
|
|
int need_raid_map);
|
|
int btrfs_map_repair_block(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_io_stripe *smap, u64 logical,
|
|
u32 length, int mirror_num);
|
|
struct btrfs_discard_stripe *btrfs_map_discard(struct btrfs_fs_info *fs_info,
|
|
u64 logical, u64 *length_ret,
|
|
u32 *num_stripes);
|
|
int btrfs_read_sys_array(struct btrfs_fs_info *fs_info);
|
|
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);
|
|
int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
|
|
blk_mode_t flags, void *holder);
|
|
struct btrfs_device *btrfs_scan_one_device(const char *path, blk_mode_t flags);
|
|
int btrfs_forget_devices(dev_t devt);
|
|
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,
|
|
const char *path);
|
|
void btrfs_put_dev_args_from_path(struct btrfs_dev_lookup_args *args);
|
|
int btrfs_rm_device(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_dev_lookup_args *args,
|
|
struct block_device **bdev, void **holder);
|
|
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);
|
|
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);
|
|
int 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);
|
|
u64 btrfs_calc_stripe_length(const struct extent_map *em);
|
|
int btrfs_nr_parity_stripes(u64 type);
|
|
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);
|
|
}
|
|
|
|
static inline const char *btrfs_dev_name(const struct btrfs_device *device)
|
|
{
|
|
if (!device || test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state))
|
|
return "<missing disk>";
|
|
else
|
|
return rcu_str_deref(device->name);
|
|
}
|
|
|
|
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);
|
|
|
|
bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr);
|
|
u8 *btrfs_sb_fsid_ptr(struct btrfs_super_block *sb);
|
|
|
|
#endif
|