^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) #ifndef _RAID10_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) #define _RAID10_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) /* Note: raid10_info.rdev can be set to NULL asynchronously by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * raid10_remove_disk.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * There are three safe ways to access raid10_info.rdev.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * 1/ when holding mddev->reconfig_mutex
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * 2/ when resync/recovery/reshape is known to be happening - i.e. in code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * that is called as part of performing resync/recovery/reshape.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * 3/ while holding rcu_read_lock(), use rcu_dereference to get the pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * and if it is non-NULL, increment rdev->nr_pending before dropping the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * RCU lock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * When .rdev is set to NULL, the nr_pending count checked again and if it has
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * been incremented, the pointer is put back in .rdev.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) struct raid10_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) struct md_rdev *rdev, *replacement;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) sector_t head_position;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) int recovery_disabled; /* matches
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * mddev->recovery_disabled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * when we shouldn't try
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * recovering this device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) struct r10conf {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) struct mddev *mddev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) struct raid10_info *mirrors;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct raid10_info *mirrors_new, *mirrors_old;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) spinlock_t device_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) /* geometry */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct geom {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) int raid_disks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) int near_copies; /* number of copies laid out
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * raid0 style */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) int far_copies; /* number of copies laid out
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * at large strides across drives
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) int far_offset; /* far_copies are offset by 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * stripe instead of many
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) sector_t stride; /* distance between far copies.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * This is size / far_copies unless
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * far_offset, in which case it is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * 1 stripe.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) int far_set_size; /* The number of devices in a set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * where a 'set' are devices that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * contain far/offset copies of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * each other.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) int chunk_shift; /* shift from chunks to sectors */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) sector_t chunk_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) } prev, geo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) int copies; /* near_copies * far_copies.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * must be <= raid_disks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) sector_t dev_sectors; /* temp copy of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * mddev->dev_sectors */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) sector_t reshape_progress;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) sector_t reshape_safe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) unsigned long reshape_checkpoint;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) sector_t offset_diff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) struct list_head retry_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) /* A separate list of r1bio which just need raid_end_bio_io called.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * This mustn't happen for writes which had any errors if the superblock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * needs to be written.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) struct list_head bio_end_io_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) /* queue pending writes and submit them on unplug */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) struct bio_list pending_bio_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) int pending_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) spinlock_t resync_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) atomic_t nr_pending;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) int nr_waiting;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) int nr_queued;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) int barrier;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) int array_freeze_pending;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) sector_t next_resync;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) int fullsync; /* set to 1 if a full sync is needed,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * (fresh device added).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * Cleared when a sync completes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) int have_replacement; /* There is at least one
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) * replacement device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) wait_queue_head_t wait_barrier;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) mempool_t r10bio_pool;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) mempool_t r10buf_pool;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) struct page *tmppage;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) struct bio_set bio_split;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) /* When taking over an array from a different personality, we store
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) * the new thread here until we fully activate the array.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) struct md_thread *thread;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) * Keep track of cluster resync window to send to other nodes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) sector_t cluster_sync_low;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) sector_t cluster_sync_high;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) * this is our 'private' RAID10 bio.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) * it contains information about what kind of IO operations were started
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) * for this RAID10 operation, and about their status:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) struct r10bio {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) atomic_t remaining; /* 'have we finished' count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) * used from IRQ handlers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) sector_t sector; /* virtual sector number */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) int sectors;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) unsigned long state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) struct mddev *mddev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) * original bio going to /dev/mdx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) struct bio *master_bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) * if the IO is in READ direction, then this is where we read
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) int read_slot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) struct list_head retry_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) * if the IO is in WRITE direction, then multiple bios are used,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) * one for each copy.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) * When resyncing we also use one for each copy.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) * When reconstructing, we use 2 bios, one for read, one for write.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) * We choose the number when they are allocated.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) * We sometimes need an extra bio to write to the replacement.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) struct r10dev {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) struct bio *bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) struct bio *repl_bio; /* used for resync and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) * writes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) struct md_rdev *rdev; /* used for reads
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) * (read_slot >= 0) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) sector_t addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) int devnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) } devs[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) /* bits for r10bio.state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) enum r10bio_state {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) R10BIO_Uptodate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) R10BIO_IsSync,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) R10BIO_IsRecover,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) R10BIO_IsReshape,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) R10BIO_Degraded,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) /* Set ReadError on bios that experience a read error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) * so that raid10d knows what to do with them.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) R10BIO_ReadError,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) /* If a write for this request means we can clear some
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) * known-bad-block records, we set this flag.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) R10BIO_MadeGood,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) R10BIO_WriteError,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) /* During a reshape we might be performing IO on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) * 'previous' part of the array, in which case this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) * flag is set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) R10BIO_Previous,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) /* failfast devices did receive failfast requests. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) R10BIO_FailFast,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) #endif
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags