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825 lines
28 KiB
825 lines
28 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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md.h : kernel internal structure of the Linux MD driver |
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Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman |
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*/ |
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#ifndef _MD_MD_H |
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#define _MD_MD_H |
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#include <linux/blkdev.h> |
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#include <linux/backing-dev.h> |
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#include <linux/badblocks.h> |
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#include <linux/kobject.h> |
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#include <linux/list.h> |
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#include <linux/mm.h> |
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#include <linux/mutex.h> |
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#include <linux/timer.h> |
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#include <linux/wait.h> |
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#include <linux/workqueue.h> |
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#include "md-cluster.h" |
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#define MaxSector (~(sector_t)0) |
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/* |
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* These flags should really be called "NO_RETRY" rather than |
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* "FAILFAST" because they don't make any promise about time lapse, |
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* only about the number of retries, which will be zero. |
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* REQ_FAILFAST_DRIVER is not included because |
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* Commit: 4a27446f3e39 ("[SCSI] modify scsi to handle new fail fast flags.") |
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* seems to suggest that the errors it avoids retrying should usually |
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* be retried. |
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*/ |
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#define MD_FAILFAST (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT) |
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|
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/* |
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* The struct embedded in rdev is used to serialize IO. |
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*/ |
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struct serial_in_rdev { |
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struct rb_root_cached serial_rb; |
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spinlock_t serial_lock; |
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wait_queue_head_t serial_io_wait; |
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}; |
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/* |
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* MD's 'extended' device |
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*/ |
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struct md_rdev { |
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struct list_head same_set; /* RAID devices within the same set */ |
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sector_t sectors; /* Device size (in 512bytes sectors) */ |
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struct mddev *mddev; /* RAID array if running */ |
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int last_events; /* IO event timestamp */ |
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/* |
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* If meta_bdev is non-NULL, it means that a separate device is |
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* being used to store the metadata (superblock/bitmap) which |
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* would otherwise be contained on the same device as the data (bdev). |
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*/ |
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struct block_device *meta_bdev; |
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struct block_device *bdev; /* block device handle */ |
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struct page *sb_page, *bb_page; |
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int sb_loaded; |
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__u64 sb_events; |
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sector_t data_offset; /* start of data in array */ |
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sector_t new_data_offset;/* only relevant while reshaping */ |
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sector_t sb_start; /* offset of the super block (in 512byte sectors) */ |
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int sb_size; /* bytes in the superblock */ |
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int preferred_minor; /* autorun support */ |
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struct kobject kobj; |
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/* A device can be in one of three states based on two flags: |
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* Not working: faulty==1 in_sync==0 |
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* Fully working: faulty==0 in_sync==1 |
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* Working, but not |
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* in sync with array |
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* faulty==0 in_sync==0 |
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* |
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* It can never have faulty==1, in_sync==1 |
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* This reduces the burden of testing multiple flags in many cases |
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*/ |
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unsigned long flags; /* bit set of 'enum flag_bits' bits. */ |
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wait_queue_head_t blocked_wait; |
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int desc_nr; /* descriptor index in the superblock */ |
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int raid_disk; /* role of device in array */ |
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int new_raid_disk; /* role that the device will have in |
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* the array after a level-change completes. |
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*/ |
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int saved_raid_disk; /* role that device used to have in the |
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* array and could again if we did a partial |
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* resync from the bitmap |
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*/ |
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union { |
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sector_t recovery_offset;/* If this device has been partially |
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* recovered, this is where we were |
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* up to. |
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*/ |
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sector_t journal_tail; /* If this device is a journal device, |
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* this is the journal tail (journal |
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* recovery start point) |
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*/ |
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}; |
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atomic_t nr_pending; /* number of pending requests. |
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* only maintained for arrays that |
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* support hot removal |
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*/ |
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atomic_t read_errors; /* number of consecutive read errors that |
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* we have tried to ignore. |
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*/ |
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time64_t last_read_error; /* monotonic time since our |
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* last read error |
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*/ |
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atomic_t corrected_errors; /* number of corrected read errors, |
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* for reporting to userspace and storing |
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* in superblock. |
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*/ |
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struct serial_in_rdev *serial; /* used for raid1 io serialization */ |
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struct work_struct del_work; /* used for delayed sysfs removal */ |
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struct kernfs_node *sysfs_state; /* handle for 'state' |
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* sysfs entry */ |
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/* handle for 'unacknowledged_bad_blocks' sysfs dentry */ |
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struct kernfs_node *sysfs_unack_badblocks; |
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/* handle for 'bad_blocks' sysfs dentry */ |
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struct kernfs_node *sysfs_badblocks; |
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struct badblocks badblocks; |
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struct { |
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short offset; /* Offset from superblock to start of PPL. |
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* Not used by external metadata. */ |
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unsigned int size; /* Size in sectors of the PPL space */ |
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sector_t sector; /* First sector of the PPL space */ |
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} ppl; |
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}; |
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enum flag_bits { |
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Faulty, /* device is known to have a fault */ |
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In_sync, /* device is in_sync with rest of array */ |
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Bitmap_sync, /* ..actually, not quite In_sync. Need a |
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* bitmap-based recovery to get fully in sync. |
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* The bit is only meaningful before device |
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* has been passed to pers->hot_add_disk. |
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*/ |
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WriteMostly, /* Avoid reading if at all possible */ |
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AutoDetected, /* added by auto-detect */ |
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Blocked, /* An error occurred but has not yet |
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* been acknowledged by the metadata |
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* handler, so don't allow writes |
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* until it is cleared */ |
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WriteErrorSeen, /* A write error has been seen on this |
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* device |
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*/ |
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FaultRecorded, /* Intermediate state for clearing |
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* Blocked. The Fault is/will-be |
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* recorded in the metadata, but that |
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* metadata hasn't been stored safely |
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* on disk yet. |
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*/ |
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BlockedBadBlocks, /* A writer is blocked because they |
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* found an unacknowledged bad-block. |
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* This can safely be cleared at any |
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* time, and the writer will re-check. |
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* It may be set at any time, and at |
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* worst the writer will timeout and |
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* re-check. So setting it as |
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* accurately as possible is good, but |
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* not absolutely critical. |
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*/ |
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WantReplacement, /* This device is a candidate to be |
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* hot-replaced, either because it has |
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* reported some faults, or because |
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* of explicit request. |
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*/ |
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Replacement, /* This device is a replacement for |
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* a want_replacement device with same |
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* raid_disk number. |
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*/ |
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Candidate, /* For clustered environments only: |
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* This device is seen locally but not |
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* by the whole cluster |
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*/ |
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Journal, /* This device is used as journal for |
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* raid-5/6. |
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* Usually, this device should be faster |
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* than other devices in the array |
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*/ |
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ClusterRemove, |
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RemoveSynchronized, /* synchronize_rcu() was called after |
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* this device was known to be faulty, |
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* so it is safe to remove without |
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* another synchronize_rcu() call. |
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*/ |
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ExternalBbl, /* External metadata provides bad |
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* block management for a disk |
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*/ |
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FailFast, /* Minimal retries should be attempted on |
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* this device, so use REQ_FAILFAST_DEV. |
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* Also don't try to repair failed reads. |
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* It is expects that no bad block log |
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* is present. |
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*/ |
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LastDev, /* Seems to be the last working dev as |
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* it didn't fail, so don't use FailFast |
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* any more for metadata |
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*/ |
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CollisionCheck, /* |
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* check if there is collision between raid1 |
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* serial bios. |
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*/ |
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}; |
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static inline int is_badblock(struct md_rdev *rdev, sector_t s, int sectors, |
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sector_t *first_bad, int *bad_sectors) |
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{ |
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if (unlikely(rdev->badblocks.count)) { |
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int rv = badblocks_check(&rdev->badblocks, rdev->data_offset + s, |
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sectors, |
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first_bad, bad_sectors); |
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if (rv) |
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*first_bad -= rdev->data_offset; |
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return rv; |
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} |
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return 0; |
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} |
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extern int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
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int is_new); |
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extern int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
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int is_new); |
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struct md_cluster_info; |
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/* change UNSUPPORTED_MDDEV_FLAGS for each array type if new flag is added */ |
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enum mddev_flags { |
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MD_ARRAY_FIRST_USE, /* First use of array, needs initialization */ |
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MD_CLOSING, /* If set, we are closing the array, do not open |
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* it then */ |
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MD_JOURNAL_CLEAN, /* A raid with journal is already clean */ |
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MD_HAS_JOURNAL, /* The raid array has journal feature set */ |
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MD_CLUSTER_RESYNC_LOCKED, /* cluster raid only, which means node |
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* already took resync lock, need to |
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* release the lock */ |
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MD_FAILFAST_SUPPORTED, /* Using MD_FAILFAST on metadata writes is |
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* supported as calls to md_error() will |
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* never cause the array to become failed. |
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*/ |
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MD_HAS_PPL, /* The raid array has PPL feature set */ |
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MD_HAS_MULTIPLE_PPLS, /* The raid array has multiple PPLs feature set */ |
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MD_ALLOW_SB_UPDATE, /* md_check_recovery is allowed to update |
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* the metadata without taking reconfig_mutex. |
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*/ |
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MD_UPDATING_SB, /* md_check_recovery is updating the metadata |
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* without explicitly holding reconfig_mutex. |
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*/ |
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MD_NOT_READY, /* do_md_run() is active, so 'array_state' |
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* must not report that array is ready yet |
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*/ |
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MD_BROKEN, /* This is used in RAID-0/LINEAR only, to stop |
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* I/O in case an array member is gone/failed. |
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*/ |
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}; |
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enum mddev_sb_flags { |
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MD_SB_CHANGE_DEVS, /* Some device status has changed */ |
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MD_SB_CHANGE_CLEAN, /* transition to or from 'clean' */ |
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MD_SB_CHANGE_PENDING, /* switch from 'clean' to 'active' in progress */ |
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MD_SB_NEED_REWRITE, /* metadata write needs to be repeated */ |
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}; |
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#define NR_SERIAL_INFOS 8 |
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/* record current range of serialize IOs */ |
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struct serial_info { |
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struct rb_node node; |
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sector_t start; /* start sector of rb node */ |
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sector_t last; /* end sector of rb node */ |
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sector_t _subtree_last; /* highest sector in subtree of rb node */ |
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}; |
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struct mddev { |
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void *private; |
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struct md_personality *pers; |
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dev_t unit; |
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int md_minor; |
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struct list_head disks; |
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unsigned long flags; |
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unsigned long sb_flags; |
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int suspended; |
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atomic_t active_io; |
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int ro; |
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int sysfs_active; /* set when sysfs deletes |
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* are happening, so run/ |
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* takeover/stop are not safe |
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*/ |
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struct gendisk *gendisk; |
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struct kobject kobj; |
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int hold_active; |
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#define UNTIL_IOCTL 1 |
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#define UNTIL_STOP 2 |
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/* Superblock information */ |
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int major_version, |
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minor_version, |
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patch_version; |
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int persistent; |
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int external; /* metadata is |
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* managed externally */ |
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char metadata_type[17]; /* externally set*/ |
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int chunk_sectors; |
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time64_t ctime, utime; |
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int level, layout; |
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char clevel[16]; |
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int raid_disks; |
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int max_disks; |
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sector_t dev_sectors; /* used size of |
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* component devices */ |
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sector_t array_sectors; /* exported array size */ |
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int external_size; /* size managed |
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* externally */ |
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__u64 events; |
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/* If the last 'event' was simply a clean->dirty transition, and |
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* we didn't write it to the spares, then it is safe and simple |
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* to just decrement the event count on a dirty->clean transition. |
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* So we record that possibility here. |
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*/ |
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int can_decrease_events; |
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char uuid[16]; |
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/* If the array is being reshaped, we need to record the |
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* new shape and an indication of where we are up to. |
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* This is written to the superblock. |
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* If reshape_position is MaxSector, then no reshape is happening (yet). |
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*/ |
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sector_t reshape_position; |
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int delta_disks, new_level, new_layout; |
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int new_chunk_sectors; |
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int reshape_backwards; |
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struct md_thread *thread; /* management thread */ |
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struct md_thread *sync_thread; /* doing resync or reconstruct */ |
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/* 'last_sync_action' is initialized to "none". It is set when a |
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* sync operation (i.e "data-check", "requested-resync", "resync", |
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* "recovery", or "reshape") is started. It holds this value even |
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* when the sync thread is "frozen" (interrupted) or "idle" (stopped |
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* or finished). It is overwritten when a new sync operation is begun. |
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*/ |
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char *last_sync_action; |
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sector_t curr_resync; /* last block scheduled */ |
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/* As resync requests can complete out of order, we cannot easily track |
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* how much resync has been completed. So we occasionally pause until |
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* everything completes, then set curr_resync_completed to curr_resync. |
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* As such it may be well behind the real resync mark, but it is a value |
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* we are certain of. |
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*/ |
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sector_t curr_resync_completed; |
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unsigned long resync_mark; /* a recent timestamp */ |
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sector_t resync_mark_cnt;/* blocks written at resync_mark */ |
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sector_t curr_mark_cnt; /* blocks scheduled now */ |
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sector_t resync_max_sectors; /* may be set by personality */ |
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atomic64_t resync_mismatches; /* count of sectors where |
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* parity/replica mismatch found |
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*/ |
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/* allow user-space to request suspension of IO to regions of the array */ |
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sector_t suspend_lo; |
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sector_t suspend_hi; |
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/* if zero, use the system-wide default */ |
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int sync_speed_min; |
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int sync_speed_max; |
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/* resync even though the same disks are shared among md-devices */ |
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int parallel_resync; |
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int ok_start_degraded; |
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unsigned long recovery; |
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/* If a RAID personality determines that recovery (of a particular |
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* device) will fail due to a read error on the source device, it |
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* takes a copy of this number and does not attempt recovery again |
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* until this number changes. |
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*/ |
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int recovery_disabled; |
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int in_sync; /* know to not need resync */ |
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/* 'open_mutex' avoids races between 'md_open' and 'do_md_stop', so |
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* that we are never stopping an array while it is open. |
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* 'reconfig_mutex' protects all other reconfiguration. |
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* These locks are separate due to conflicting interactions |
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* with disk->open_mutex. |
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* Lock ordering is: |
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* reconfig_mutex -> disk->open_mutex |
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* disk->open_mutex -> open_mutex: e.g. __blkdev_get -> md_open |
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*/ |
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struct mutex open_mutex; |
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struct mutex reconfig_mutex; |
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atomic_t active; /* general refcount */ |
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atomic_t openers; /* number of active opens */ |
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int changed; /* True if we might need to |
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* reread partition info */ |
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int degraded; /* whether md should consider |
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* adding a spare |
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*/ |
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atomic_t recovery_active; /* blocks scheduled, but not written */ |
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wait_queue_head_t recovery_wait; |
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sector_t recovery_cp; |
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sector_t resync_min; /* user requested sync |
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* starts here */ |
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sector_t resync_max; /* resync should pause |
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* when it gets here */ |
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struct kernfs_node *sysfs_state; /* handle for 'array_state' |
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* file in sysfs. |
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*/ |
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struct kernfs_node *sysfs_action; /* handle for 'sync_action' */ |
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struct kernfs_node *sysfs_completed; /*handle for 'sync_completed' */ |
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struct kernfs_node *sysfs_degraded; /*handle for 'degraded' */ |
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struct kernfs_node *sysfs_level; /*handle for 'level' */ |
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struct work_struct del_work; /* used for delayed sysfs removal */ |
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/* "lock" protects: |
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* flush_bio transition from NULL to !NULL |
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* rdev superblocks, events |
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* clearing MD_CHANGE_* |
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* in_sync - and related safemode and MD_CHANGE changes |
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* pers (also protected by reconfig_mutex and pending IO). |
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* clearing ->bitmap |
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* clearing ->bitmap_info.file |
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* changing ->resync_{min,max} |
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* setting MD_RECOVERY_RUNNING (which interacts with resync_{min,max}) |
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*/ |
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spinlock_t lock; |
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wait_queue_head_t sb_wait; /* for waiting on superblock updates */ |
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atomic_t pending_writes; /* number of active superblock writes */ |
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unsigned int safemode; /* if set, update "clean" superblock |
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* when no writes pending. |
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*/ |
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unsigned int safemode_delay; |
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struct timer_list safemode_timer; |
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struct percpu_ref writes_pending; |
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int sync_checkers; /* # of threads checking writes_pending */ |
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struct request_queue *queue; /* for plugging ... */ |
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struct bitmap *bitmap; /* the bitmap for the device */ |
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struct { |
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struct file *file; /* the bitmap file */ |
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loff_t offset; /* offset from superblock of |
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* start of bitmap. May be |
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* negative, but not '0' |
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* For external metadata, offset |
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* from start of device. |
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*/ |
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unsigned long space; /* space available at this offset */ |
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loff_t default_offset; /* this is the offset to use when |
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* hot-adding a bitmap. It should |
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* eventually be settable by sysfs. |
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*/ |
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unsigned long default_space; /* space available at |
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* default offset */ |
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struct mutex mutex; |
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unsigned long chunksize; |
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unsigned long daemon_sleep; /* how many jiffies between updates? */ |
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unsigned long max_write_behind; /* write-behind mode */ |
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int external; |
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int nodes; /* Maximum number of nodes in the cluster */ |
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char cluster_name[64]; /* Name of the cluster */ |
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} bitmap_info; |
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atomic_t max_corr_read_errors; /* max read retries */ |
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struct list_head all_mddevs; |
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const struct attribute_group *to_remove; |
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struct bio_set bio_set; |
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struct bio_set sync_set; /* for sync operations like |
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* metadata and bitmap writes |
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*/ |
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struct bio_set io_acct_set; /* for raid0 and raid5 io accounting */ |
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|
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/* Generic flush handling. |
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* The last to finish preflush schedules a worker to submit |
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* the rest of the request (without the REQ_PREFLUSH flag). |
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*/ |
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struct bio *flush_bio; |
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atomic_t flush_pending; |
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ktime_t start_flush, prev_flush_start; /* prev_flush_start is when the previous completed |
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* flush was started. |
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*/ |
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struct work_struct flush_work; |
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struct work_struct event_work; /* used by dm to report failure event */ |
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mempool_t *serial_info_pool; |
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void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev); |
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struct md_cluster_info *cluster_info; |
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unsigned int good_device_nr; /* good device num within cluster raid */ |
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unsigned int noio_flag; /* for memalloc scope API */ |
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bool has_superblocks:1; |
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bool fail_last_dev:1; |
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bool serialize_policy:1; |
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}; |
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enum recovery_flags { |
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/* |
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* If neither SYNC or RESHAPE are set, then it is a recovery. |
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*/ |
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MD_RECOVERY_RUNNING, /* a thread is running, or about to be started */ |
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MD_RECOVERY_SYNC, /* actually doing a resync, not a recovery */ |
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MD_RECOVERY_RECOVER, /* doing recovery, or need to try it. */ |
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MD_RECOVERY_INTR, /* resync needs to be aborted for some reason */ |
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MD_RECOVERY_DONE, /* thread is done and is waiting to be reaped */ |
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MD_RECOVERY_NEEDED, /* we might need to start a resync/recover */ |
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MD_RECOVERY_REQUESTED, /* user-space has requested a sync (used with SYNC) */ |
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MD_RECOVERY_CHECK, /* user-space request for check-only, no repair */ |
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MD_RECOVERY_RESHAPE, /* A reshape is happening */ |
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MD_RECOVERY_FROZEN, /* User request to abort, and not restart, any action */ |
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MD_RECOVERY_ERROR, /* sync-action interrupted because io-error */ |
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MD_RECOVERY_WAIT, /* waiting for pers->start() to finish */ |
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MD_RESYNCING_REMOTE, /* remote node is running resync thread */ |
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}; |
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|
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static inline int __must_check mddev_lock(struct mddev *mddev) |
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{ |
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return mutex_lock_interruptible(&mddev->reconfig_mutex); |
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} |
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|
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/* Sometimes we need to take the lock in a situation where |
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* failure due to interrupts is not acceptable. |
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*/ |
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static inline void mddev_lock_nointr(struct mddev *mddev) |
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{ |
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mutex_lock(&mddev->reconfig_mutex); |
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} |
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|
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static inline int mddev_trylock(struct mddev *mddev) |
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{ |
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return mutex_trylock(&mddev->reconfig_mutex); |
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} |
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extern void mddev_unlock(struct mddev *mddev); |
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static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors) |
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{ |
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atomic_add(nr_sectors, &bdev->bd_disk->sync_io); |
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} |
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|
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static inline void md_sync_acct_bio(struct bio *bio, unsigned long nr_sectors) |
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{ |
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md_sync_acct(bio->bi_bdev, nr_sectors); |
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} |
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|
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struct md_personality |
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{ |
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char *name; |
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int level; |
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struct list_head list; |
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struct module *owner; |
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bool __must_check (*make_request)(struct mddev *mddev, struct bio *bio); |
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/* |
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* start up works that do NOT require md_thread. tasks that |
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* requires md_thread should go into start() |
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*/ |
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int (*run)(struct mddev *mddev); |
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/* start up works that require md threads */ |
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int (*start)(struct mddev *mddev); |
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void (*free)(struct mddev *mddev, void *priv); |
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void (*status)(struct seq_file *seq, struct mddev *mddev); |
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/* error_handler must set ->faulty and clear ->in_sync |
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* if appropriate, and should abort recovery if needed |
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*/ |
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void (*error_handler)(struct mddev *mddev, struct md_rdev *rdev); |
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int (*hot_add_disk) (struct mddev *mddev, struct md_rdev *rdev); |
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int (*hot_remove_disk) (struct mddev *mddev, struct md_rdev *rdev); |
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int (*spare_active) (struct mddev *mddev); |
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sector_t (*sync_request)(struct mddev *mddev, sector_t sector_nr, int *skipped); |
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int (*resize) (struct mddev *mddev, sector_t sectors); |
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sector_t (*size) (struct mddev *mddev, sector_t sectors, int raid_disks); |
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int (*check_reshape) (struct mddev *mddev); |
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int (*start_reshape) (struct mddev *mddev); |
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void (*finish_reshape) (struct mddev *mddev); |
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void (*update_reshape_pos) (struct mddev *mddev); |
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/* quiesce suspends or resumes internal processing. |
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* 1 - stop new actions and wait for action io to complete |
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* 0 - return to normal behaviour |
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*/ |
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void (*quiesce) (struct mddev *mddev, int quiesce); |
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/* takeover is used to transition an array from one |
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* personality to another. The new personality must be able |
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* to handle the data in the current layout. |
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* e.g. 2drive raid1 -> 2drive raid5 |
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* ndrive raid5 -> degraded n+1drive raid6 with special layout |
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* If the takeover succeeds, a new 'private' structure is returned. |
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* This needs to be installed and then ->run used to activate the |
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* array. |
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*/ |
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void *(*takeover) (struct mddev *mddev); |
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/* Changes the consistency policy of an active array. */ |
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int (*change_consistency_policy)(struct mddev *mddev, const char *buf); |
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}; |
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|
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struct md_sysfs_entry { |
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struct attribute attr; |
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ssize_t (*show)(struct mddev *, char *); |
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ssize_t (*store)(struct mddev *, const char *, size_t); |
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}; |
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extern const struct attribute_group md_bitmap_group; |
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|
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static inline struct kernfs_node *sysfs_get_dirent_safe(struct kernfs_node *sd, char *name) |
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{ |
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if (sd) |
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return sysfs_get_dirent(sd, name); |
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return sd; |
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} |
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static inline void sysfs_notify_dirent_safe(struct kernfs_node *sd) |
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{ |
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if (sd) |
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sysfs_notify_dirent(sd); |
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} |
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|
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static inline char * mdname (struct mddev * mddev) |
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{ |
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return mddev->gendisk ? mddev->gendisk->disk_name : "mdX"; |
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} |
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|
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static inline int sysfs_link_rdev(struct mddev *mddev, struct md_rdev *rdev) |
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{ |
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char nm[20]; |
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if (!test_bit(Replacement, &rdev->flags) && |
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!test_bit(Journal, &rdev->flags) && |
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mddev->kobj.sd) { |
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sprintf(nm, "rd%d", rdev->raid_disk); |
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return sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); |
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} else |
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return 0; |
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} |
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|
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static inline void sysfs_unlink_rdev(struct mddev *mddev, struct md_rdev *rdev) |
|
{ |
|
char nm[20]; |
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if (!test_bit(Replacement, &rdev->flags) && |
|
!test_bit(Journal, &rdev->flags) && |
|
mddev->kobj.sd) { |
|
sprintf(nm, "rd%d", rdev->raid_disk); |
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sysfs_remove_link(&mddev->kobj, nm); |
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} |
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} |
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|
|
/* |
|
* iterates through some rdev ringlist. It's safe to remove the |
|
* current 'rdev'. Dont touch 'tmp' though. |
|
*/ |
|
#define rdev_for_each_list(rdev, tmp, head) \ |
|
list_for_each_entry_safe(rdev, tmp, head, same_set) |
|
|
|
/* |
|
* iterates through the 'same array disks' ringlist |
|
*/ |
|
#define rdev_for_each(rdev, mddev) \ |
|
list_for_each_entry(rdev, &((mddev)->disks), same_set) |
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|
|
#define rdev_for_each_safe(rdev, tmp, mddev) \ |
|
list_for_each_entry_safe(rdev, tmp, &((mddev)->disks), same_set) |
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|
|
#define rdev_for_each_rcu(rdev, mddev) \ |
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list_for_each_entry_rcu(rdev, &((mddev)->disks), same_set) |
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|
|
struct md_thread { |
|
void (*run) (struct md_thread *thread); |
|
struct mddev *mddev; |
|
wait_queue_head_t wqueue; |
|
unsigned long flags; |
|
struct task_struct *tsk; |
|
unsigned long timeout; |
|
void *private; |
|
}; |
|
|
|
struct md_io_acct { |
|
struct bio *orig_bio; |
|
unsigned long start_time; |
|
struct bio bio_clone; |
|
}; |
|
|
|
#define THREAD_WAKEUP 0 |
|
|
|
static inline void safe_put_page(struct page *p) |
|
{ |
|
if (p) put_page(p); |
|
} |
|
|
|
extern int register_md_personality(struct md_personality *p); |
|
extern int unregister_md_personality(struct md_personality *p); |
|
extern int register_md_cluster_operations(struct md_cluster_operations *ops, |
|
struct module *module); |
|
extern int unregister_md_cluster_operations(void); |
|
extern int md_setup_cluster(struct mddev *mddev, int nodes); |
|
extern void md_cluster_stop(struct mddev *mddev); |
|
extern struct md_thread *md_register_thread( |
|
void (*run)(struct md_thread *thread), |
|
struct mddev *mddev, |
|
const char *name); |
|
extern void md_unregister_thread(struct md_thread **threadp); |
|
extern void md_wakeup_thread(struct md_thread *thread); |
|
extern void md_check_recovery(struct mddev *mddev); |
|
extern void md_reap_sync_thread(struct mddev *mddev); |
|
extern int mddev_init_writes_pending(struct mddev *mddev); |
|
extern bool md_write_start(struct mddev *mddev, struct bio *bi); |
|
extern void md_write_inc(struct mddev *mddev, struct bio *bi); |
|
extern void md_write_end(struct mddev *mddev); |
|
extern void md_done_sync(struct mddev *mddev, int blocks, int ok); |
|
extern void md_error(struct mddev *mddev, struct md_rdev *rdev); |
|
extern void md_finish_reshape(struct mddev *mddev); |
|
void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev, |
|
struct bio *bio, sector_t start, sector_t size); |
|
int acct_bioset_init(struct mddev *mddev); |
|
void acct_bioset_exit(struct mddev *mddev); |
|
void md_account_bio(struct mddev *mddev, struct bio **bio); |
|
|
|
extern bool __must_check md_flush_request(struct mddev *mddev, struct bio *bio); |
|
extern void md_super_write(struct mddev *mddev, struct md_rdev *rdev, |
|
sector_t sector, int size, struct page *page); |
|
extern int md_super_wait(struct mddev *mddev); |
|
extern int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, |
|
struct page *page, int op, int op_flags, |
|
bool metadata_op); |
|
extern void md_do_sync(struct md_thread *thread); |
|
extern void md_new_event(void); |
|
extern void md_allow_write(struct mddev *mddev); |
|
extern void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev); |
|
extern void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors); |
|
extern int md_check_no_bitmap(struct mddev *mddev); |
|
extern int md_integrity_register(struct mddev *mddev); |
|
extern int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev); |
|
extern int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale); |
|
|
|
extern void mddev_init(struct mddev *mddev); |
|
extern int md_run(struct mddev *mddev); |
|
extern int md_start(struct mddev *mddev); |
|
extern void md_stop(struct mddev *mddev); |
|
extern void md_stop_writes(struct mddev *mddev); |
|
extern int md_rdev_init(struct md_rdev *rdev); |
|
extern void md_rdev_clear(struct md_rdev *rdev); |
|
|
|
extern void md_handle_request(struct mddev *mddev, struct bio *bio); |
|
extern void mddev_suspend(struct mddev *mddev); |
|
extern void mddev_resume(struct mddev *mddev); |
|
|
|
extern void md_reload_sb(struct mddev *mddev, int raid_disk); |
|
extern void md_update_sb(struct mddev *mddev, int force); |
|
extern void md_kick_rdev_from_array(struct md_rdev * rdev); |
|
extern void mddev_create_serial_pool(struct mddev *mddev, struct md_rdev *rdev, |
|
bool is_suspend); |
|
extern void mddev_destroy_serial_pool(struct mddev *mddev, struct md_rdev *rdev, |
|
bool is_suspend); |
|
struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr); |
|
struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev); |
|
|
|
static inline bool is_mddev_broken(struct md_rdev *rdev, const char *md_type) |
|
{ |
|
if (!disk_live(rdev->bdev->bd_disk)) { |
|
if (!test_and_set_bit(MD_BROKEN, &rdev->mddev->flags)) |
|
pr_warn("md: %s: %s array has a missing/failed member\n", |
|
mdname(rdev->mddev), md_type); |
|
return true; |
|
} |
|
return false; |
|
} |
|
|
|
static inline void rdev_dec_pending(struct md_rdev *rdev, struct mddev *mddev) |
|
{ |
|
int faulty = test_bit(Faulty, &rdev->flags); |
|
if (atomic_dec_and_test(&rdev->nr_pending) && faulty) { |
|
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
|
md_wakeup_thread(mddev->thread); |
|
} |
|
} |
|
|
|
extern struct md_cluster_operations *md_cluster_ops; |
|
static inline int mddev_is_clustered(struct mddev *mddev) |
|
{ |
|
return mddev->cluster_info && mddev->bitmap_info.nodes > 1; |
|
} |
|
|
|
/* clear unsupported mddev_flags */ |
|
static inline void mddev_clear_unsupported_flags(struct mddev *mddev, |
|
unsigned long unsupported_flags) |
|
{ |
|
mddev->flags &= ~unsupported_flags; |
|
} |
|
|
|
static inline void mddev_check_writesame(struct mddev *mddev, struct bio *bio) |
|
{ |
|
if (bio_op(bio) == REQ_OP_WRITE_SAME && |
|
!bio->bi_bdev->bd_disk->queue->limits.max_write_same_sectors) |
|
mddev->queue->limits.max_write_same_sectors = 0; |
|
} |
|
|
|
static inline void mddev_check_write_zeroes(struct mddev *mddev, struct bio *bio) |
|
{ |
|
if (bio_op(bio) == REQ_OP_WRITE_ZEROES && |
|
!bio->bi_bdev->bd_disk->queue->limits.max_write_zeroes_sectors) |
|
mddev->queue->limits.max_write_zeroes_sectors = 0; |
|
} |
|
|
|
struct mdu_array_info_s; |
|
struct mdu_disk_info_s; |
|
|
|
extern int mdp_major; |
|
void md_autostart_arrays(int part); |
|
int md_set_array_info(struct mddev *mddev, struct mdu_array_info_s *info); |
|
int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info); |
|
int do_md_run(struct mddev *mddev); |
|
|
|
extern const struct block_device_operations md_fops; |
|
|
|
#endif /* _MD_MD_H */
|
|
|