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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180/* SPDX-License-Identifier: GPL-2.0 */#ifndef _RAID10_H#define _RAID10_H
/* Note: raid10_info.rdev can be set to NULL asynchronously by * raid10_remove_disk. * There are three safe ways to access raid10_info.rdev. * 1/ when holding mddev->reconfig_mutex * 2/ when resync/recovery/reshape is known to be happening - i.e. in code * that is called as part of performing resync/recovery/reshape. * 3/ while holding rcu_read_lock(), use rcu_dereference to get the pointer * and if it is non-NULL, increment rdev->nr_pending before dropping the * RCU lock. * When .rdev is set to NULL, the nr_pending count checked again and if it has * been incremented, the pointer is put back in .rdev. */
struct raid10_info { struct md_rdev *rdev, *replacement; sector_t head_position;};
struct r10conf { struct mddev *mddev; struct raid10_info *mirrors; struct raid10_info *mirrors_new, *mirrors_old; spinlock_t device_lock;
/* geometry */ struct geom { int raid_disks; int near_copies; /* number of copies laid out * raid0 style */ int far_copies; /* number of copies laid out * at large strides across drives */ int far_offset; /* far_copies are offset by 1 * stripe instead of many */ sector_t stride; /* distance between far copies. * This is size / far_copies unless * far_offset, in which case it is * 1 stripe. */ int far_set_size; /* The number of devices in a set, * where a 'set' are devices that * contain far/offset copies of * each other. */ int chunk_shift; /* shift from chunks to sectors */ sector_t chunk_mask; } prev, geo; int copies; /* near_copies * far_copies. * must be <= raid_disks */
sector_t dev_sectors; /* temp copy of * mddev->dev_sectors */ sector_t reshape_progress; sector_t reshape_safe; unsigned long reshape_checkpoint; sector_t offset_diff;
struct list_head retry_list; /* A separate list of r1bio which just need raid_end_bio_io called. * This mustn't happen for writes which had any errors if the superblock * needs to be written. */ struct list_head bio_end_io_list;
/* queue pending writes and submit them on unplug */ struct bio_list pending_bio_list;
seqlock_t resync_lock; atomic_t nr_pending; int nr_waiting; int nr_queued; int barrier; int array_freeze_pending; sector_t next_resync; int fullsync; /* set to 1 if a full sync is needed, * (fresh device added). * Cleared when a sync completes. */ int have_replacement; /* There is at least one * replacement device. */ wait_queue_head_t wait_barrier;
mempool_t r10bio_pool; mempool_t r10buf_pool; struct page *tmppage; struct bio_set bio_split;
/* When taking over an array from a different personality, we store * the new thread here until we fully activate the array. */ struct md_thread __rcu *thread;
/* * Keep track of cluster resync window to send to other nodes. */ sector_t cluster_sync_low; sector_t cluster_sync_high;};
/* * this is our 'private' RAID10 bio. * * it contains information about what kind of IO operations were started * for this RAID10 operation, and about their status: */
struct r10bio { atomic_t remaining; /* 'have we finished' count, * used from IRQ handlers */ sector_t sector; /* virtual sector number */ int sectors; unsigned long state; struct mddev *mddev; /* * original bio going to /dev/mdx */ struct bio *master_bio; /* * if the IO is in READ direction, then this is where we read */ int read_slot;
struct list_head retry_list; /* * if the IO is in WRITE direction, then multiple bios are used, * one for each copy. * When resyncing we also use one for each copy. * When reconstructing, we use 2 bios, one for read, one for write. * We choose the number when they are allocated. * We sometimes need an extra bio to write to the replacement. */ struct r10dev { struct bio *bio; union { struct bio *repl_bio; /* used for resync and * writes */ struct md_rdev *rdev; /* used for reads * (read_slot >= 0) */ }; sector_t addr; int devnum; } devs[];};
/* bits for r10bio.state */enum r10bio_state { R10BIO_Uptodate, R10BIO_IsSync, R10BIO_IsRecover, R10BIO_IsReshape,/* Set ReadError on bios that experience a read error * so that raid10d knows what to do with them. */ R10BIO_ReadError,/* For bio_split errors, record that bi_end_io was called. */ R10BIO_Returned,/* If a write for this request means we can clear some * known-bad-block records, we set this flag. */ R10BIO_MadeGood, R10BIO_WriteError,/* During a reshape we might be performing IO on the * 'previous' part of the array, in which case this * flag is set */ R10BIO_Previous,/* failfast devices did receive failfast requests. */ R10BIO_FailFast, R10BIO_Discard,};#endif