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![Su Yue](/assets/img/avatar_default.png)
This effectively reverts commitd5c8238849
("btrfs: convert data_seqcount to seqcount_mutex_t"). While running fstests on 32 bits test box, many tests failed because of warnings in dmesg. One of those warnings (btrfs/003): [66.441317] WARNING: CPU: 6 PID: 9251 at include/linux/seqlock.h:279 btrfs_remove_chunk+0x58b/0x7b0 [btrfs] [66.441446] CPU: 6 PID: 9251 Comm: btrfs Tainted: G O 5.11.0-rc4-custom+ #5 [66.441449] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ArchLinux 1.14.0-1 04/01/2014 [66.441451] EIP: btrfs_remove_chunk+0x58b/0x7b0 [btrfs] [66.441472] EAX: 00000000 EBX: 00000001 ECX: c576070c EDX: c6b15803 [66.441475] ESI: 10000000 EDI: 00000000 EBP: c56fbcfc ESP: c56fbc70 [66.441477] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00010246 [66.441481] CR0: 80050033 CR2: 05c8da20 CR3: 04b20000 CR4: 00350ed0 [66.441485] Call Trace: [66.441510] btrfs_relocate_chunk+0xb1/0x100 [btrfs] [66.441529] ? btrfs_lookup_block_group+0x17/0x20 [btrfs] [66.441562] btrfs_balance+0x8ed/0x13b0 [btrfs] [66.441586] ? btrfs_ioctl_balance+0x333/0x3c0 [btrfs] [66.441619] ? __this_cpu_preempt_check+0xf/0x11 [66.441643] btrfs_ioctl_balance+0x333/0x3c0 [btrfs] [66.441664] ? btrfs_ioctl_get_supported_features+0x30/0x30 [btrfs] [66.441683] btrfs_ioctl+0x414/0x2ae0 [btrfs] [66.441700] ? __lock_acquire+0x35f/0x2650 [66.441717] ? lockdep_hardirqs_on+0x87/0x120 [66.441720] ? lockdep_hardirqs_on_prepare+0xd0/0x1e0 [66.441724] ? call_rcu+0x2d3/0x530 [66.441731] ? __might_fault+0x41/0x90 [66.441736] ? kvm_sched_clock_read+0x15/0x50 [66.441740] ? sched_clock+0x8/0x10 [66.441745] ? sched_clock_cpu+0x13/0x180 [66.441750] ? btrfs_ioctl_get_supported_features+0x30/0x30 [btrfs] [66.441750] ? btrfs_ioctl_get_supported_features+0x30/0x30 [btrfs] [66.441768] __ia32_sys_ioctl+0x165/0x8a0 [66.441773] ? __this_cpu_preempt_check+0xf/0x11 [66.441785] ? __might_fault+0x89/0x90 [66.441791] __do_fast_syscall_32+0x54/0x80 [66.441796] do_fast_syscall_32+0x32/0x70 [66.441801] do_SYSENTER_32+0x15/0x20 [66.441805] entry_SYSENTER_32+0x9f/0xf2 [66.441808] EIP: 0xab7b5549 [66.441814] EAX: ffffffda EBX: 00000003 ECX: c4009420 EDX: bfa91f5c [66.441816] ESI: 00000003 EDI: 00000001 EBP: 00000000 ESP: bfa91e98 [66.441818] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b EFLAGS: 00000292 [66.441833] irq event stamp: 42579 [66.441835] hardirqs last enabled at (42585): [<c60eb065>] console_unlock+0x495/0x590 [66.441838] hardirqs last disabled at (42590): [<c60eafd5>] console_unlock+0x405/0x590 [66.441840] softirqs last enabled at (41698): [<c601b76c>] call_on_stack+0x1c/0x60 [66.441843] softirqs last disabled at (41681): [<c601b76c>] call_on_stack+0x1c/0x60 ======================================================================== btrfs_remove_chunk+0x58b/0x7b0: __seqprop_mutex_assert at linux/./include/linux/seqlock.h:279 (inlined by) btrfs_device_set_bytes_used at linux/fs/btrfs/volumes.h:212 (inlined by) btrfs_remove_chunk at linux/fs/btrfs/volumes.c:2994 ======================================================================== The warning is produced by lockdep_assert_held() in __seqprop_mutex_assert() if CONFIG_LOCKDEP is enabled. And "olumes.c:2994 is btrfs_device_set_bytes_used() with mutex lock fs_info->chunk_mutex held already. After adding some debug prints, the cause was found that many __alloc_device() are called with NULL @fs_info (during scanning ioctl). Inside the function, btrfs_device_data_ordered_init() is expanded to seqcount_mutex_init(). In this scenario, its second parameter info->chunk_mutex is &NULL->chunk_mutex which equals to offsetof(struct btrfs_fs_info, chunk_mutex) unexpectedly. Thus, seqcount_mutex_init() is called in wrong way. And later btrfs_device_get/set helpers trigger lockdep warnings. The device and filesystem object lifetimes are different and we'd have to synchronize initialization of the btrfs_device::data_seqcount with the fs_info, possibly using some additional synchronization. It would still not prevent concurrent access to the seqcount lock when it's used for read and initialization. Commitd5c8238849
("btrfs: convert data_seqcount to seqcount_mutex_t") does not mention a particular problem being fixed so revert should not cause any harm and we'll get the lockdep warning fixed. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=210139 Reported-by: Erhard F <erhard_f@mailbox.org> Fixes:d5c8238849
("btrfs: convert data_seqcount to seqcount_mutex_t") CC: stable@vger.kernel.org # 5.10 CC: Davidlohr Bueso <dbueso@suse.de> Signed-off-by: Su Yue <l@damenly.su> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
600 lines
17 KiB
C
600 lines
17 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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/* readahead state */
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atomic_t reada_in_flight;
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u64 reada_next;
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struct reada_zone *reada_curr_zone;
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struct radix_tree_root reada_zones;
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struct radix_tree_root reada_extents;
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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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};
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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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};
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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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u64 num_devices;
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u64 open_devices;
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u64 rw_devices;
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u64 missing_devices;
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u64 total_rw_bytes;
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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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struct block_device *latest_bdev;
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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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* we need the mirror number and stripe index to be passed around
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* the call chain while we are processing end_io (especially errors).
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* Really, what we need is a btrfs_bio structure that has this info
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* and is properly sized with its stripe array, but we're not there
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* quite yet. We have our own btrfs bioset, and all of the bios
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* we allocate are actually btrfs_io_bios. We'll cram as much of
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* struct btrfs_bio as we can into this over time.
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*/
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struct btrfs_io_bio {
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unsigned int mirror_num;
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struct btrfs_device *device;
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u64 logical;
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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_io_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_io_bio *btrfs_io_bio(struct bio *bio)
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{
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return container_of(bio, struct btrfs_io_bio, bio);
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}
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static inline void btrfs_io_bio_free_csum(struct btrfs_io_bio *io_bio)
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{
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if (io_bio->csum != io_bio->csum_inline) {
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kfree(io_bio->csum);
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io_bio->csum = NULL;
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}
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}
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struct btrfs_bio_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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struct btrfs_bio {
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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_bio_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_bio_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_bio_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;
|
|
struct btrfs_balance_args sys;
|
|
|
|
u64 flags;
|
|
|
|
struct btrfs_balance_progress stat;
|
|
};
|
|
|
|
enum btrfs_map_op {
|
|
BTRFS_MAP_READ,
|
|
BTRFS_MAP_WRITE,
|
|
BTRFS_MAP_DISCARD,
|
|
BTRFS_MAP_GET_READ_MIRRORS,
|
|
};
|
|
|
|
static inline enum btrfs_map_op btrfs_op(struct bio *bio)
|
|
{
|
|
switch (bio_op(bio)) {
|
|
case REQ_OP_DISCARD:
|
|
return BTRFS_MAP_DISCARD;
|
|
case REQ_OP_WRITE:
|
|
return BTRFS_MAP_WRITE;
|
|
default:
|
|
WARN_ON_ONCE(1);
|
|
fallthrough;
|
|
case REQ_OP_READ:
|
|
return BTRFS_MAP_READ;
|
|
}
|
|
}
|
|
|
|
void btrfs_get_bbio(struct btrfs_bio *bbio);
|
|
void btrfs_put_bbio(struct btrfs_bio *bbio);
|
|
int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
|
|
u64 logical, u64 *length,
|
|
struct btrfs_bio **bbio_ret, int mirror_num);
|
|
int btrfs_map_sblock(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
|
|
u64 logical, u64 *length,
|
|
struct btrfs_bio **bbio_ret);
|
|
int btrfs_get_io_geometry(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
|
|
u64 logical, u64 len, struct btrfs_io_geometry *io_geom);
|
|
int btrfs_read_sys_array(struct btrfs_fs_info *fs_info);
|
|
int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info);
|
|
int btrfs_alloc_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);
|
|
struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
|
|
const u64 *devid,
|
|
const u8 *uuid);
|
|
void btrfs_free_device(struct btrfs_device *device);
|
|
int btrfs_rm_device(struct btrfs_fs_info *fs_info,
|
|
const char *device_path, u64 devid);
|
|
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(struct btrfs_fs_devices *fs_devices,
|
|
u64 devid, u8 *uuid, u8 *fsid);
|
|
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_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);
|
|
int btrfs_chunk_readonly(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_finish_chunk_alloc(struct btrfs_trans_handle *trans,
|
|
u64 chunk_offset, u64 chunk_size);
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* Convert block group flags (BTRFS_BLOCK_GROUP_*) to btrfs_raid_types, which
|
|
* can be used as index to access btrfs_raid_array[].
|
|
*/
|
|
static inline enum btrfs_raid_types btrfs_bg_flags_to_raid_index(u64 flags)
|
|
{
|
|
if (flags & BTRFS_BLOCK_GROUP_RAID10)
|
|
return BTRFS_RAID_RAID10;
|
|
else if (flags & BTRFS_BLOCK_GROUP_RAID1)
|
|
return BTRFS_RAID_RAID1;
|
|
else if (flags & BTRFS_BLOCK_GROUP_RAID1C3)
|
|
return BTRFS_RAID_RAID1C3;
|
|
else if (flags & BTRFS_BLOCK_GROUP_RAID1C4)
|
|
return BTRFS_RAID_RAID1C4;
|
|
else if (flags & BTRFS_BLOCK_GROUP_DUP)
|
|
return BTRFS_RAID_DUP;
|
|
else if (flags & BTRFS_BLOCK_GROUP_RAID0)
|
|
return BTRFS_RAID_RAID0;
|
|
else if (flags & BTRFS_BLOCK_GROUP_RAID5)
|
|
return BTRFS_RAID_RAID5;
|
|
else if (flags & BTRFS_BLOCK_GROUP_RAID6)
|
|
return BTRFS_RAID_RAID6;
|
|
|
|
return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */
|
|
}
|
|
|
|
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);
|
|
|
|
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);
|
|
|
|
#endif
|