^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * multipath.c : Multiple Devices driver for Linux
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 1999, 2000, 2001 Ingo Molnar, Red Hat
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (C) 1996, 1997, 1998 Ingo Molnar, Miguel de Icaza, Gadi Oxman
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * MULTIPATH management functions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * derived from raid1.c.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/blkdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/raid/md_u.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include "md.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include "md-multipath.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define MAX_WORK_PER_DISK 128
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define NR_RESERVED_BUFS 32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static int multipath_map (struct mpconf *conf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) int i, disks = conf->raid_disks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * Later we do read balancing on the read side
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * now we use the first available disk.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) for (i = 0; i < disks; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) struct md_rdev *rdev = rcu_dereference(conf->multipaths[i].rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) if (rdev && test_bit(In_sync, &rdev->flags) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) !test_bit(Faulty, &rdev->flags)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) atomic_inc(&rdev->nr_pending);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) return i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) pr_crit_ratelimited("multipath_map(): no more operational IO paths?\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) return (-1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) static void multipath_reschedule_retry (struct multipath_bh *mp_bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) struct mddev *mddev = mp_bh->mddev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) struct mpconf *conf = mddev->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) spin_lock_irqsave(&conf->device_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) list_add(&mp_bh->retry_list, &conf->retry_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) spin_unlock_irqrestore(&conf->device_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) md_wakeup_thread(mddev->thread);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * multipath_end_bh_io() is called when we have finished servicing a multipathed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * operation and are ready to return a success/failure code to the buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) * cache layer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) static void multipath_end_bh_io(struct multipath_bh *mp_bh, blk_status_t status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) struct bio *bio = mp_bh->master_bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) struct mpconf *conf = mp_bh->mddev->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) bio->bi_status = status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) bio_endio(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) mempool_free(mp_bh, &conf->pool);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) static void multipath_end_request(struct bio *bio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) struct multipath_bh *mp_bh = bio->bi_private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) struct mpconf *conf = mp_bh->mddev->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) struct md_rdev *rdev = conf->multipaths[mp_bh->path].rdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (!bio->bi_status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) multipath_end_bh_io(mp_bh, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) else if (!(bio->bi_opf & REQ_RAHEAD)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * oops, IO error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) char b[BDEVNAME_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) md_error (mp_bh->mddev, rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) pr_info("multipath: %s: rescheduling sector %llu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) bdevname(rdev->bdev,b),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) (unsigned long long)bio->bi_iter.bi_sector);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) multipath_reschedule_retry(mp_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) multipath_end_bh_io(mp_bh, bio->bi_status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) rdev_dec_pending(rdev, conf->mddev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) static bool multipath_make_request(struct mddev *mddev, struct bio * bio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) struct mpconf *conf = mddev->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) struct multipath_bh * mp_bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) struct multipath_info *multipath;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) if (unlikely(bio->bi_opf & REQ_PREFLUSH)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) && md_flush_request(mddev, bio))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) mp_bh = mempool_alloc(&conf->pool, GFP_NOIO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) mp_bh->master_bio = bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) mp_bh->mddev = mddev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) mp_bh->path = multipath_map(conf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) if (mp_bh->path < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) bio_io_error(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) mempool_free(mp_bh, &conf->pool);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) multipath = conf->multipaths + mp_bh->path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) bio_init(&mp_bh->bio, NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) __bio_clone_fast(&mp_bh->bio, bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) mp_bh->bio.bi_iter.bi_sector += multipath->rdev->data_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) bio_set_dev(&mp_bh->bio, multipath->rdev->bdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) mp_bh->bio.bi_opf |= REQ_FAILFAST_TRANSPORT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) mp_bh->bio.bi_end_io = multipath_end_request;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) mp_bh->bio.bi_private = mp_bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) mddev_check_writesame(mddev, &mp_bh->bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) mddev_check_write_zeroes(mddev, &mp_bh->bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) submit_bio_noacct(&mp_bh->bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) static void multipath_status(struct seq_file *seq, struct mddev *mddev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) struct mpconf *conf = mddev->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) seq_printf (seq, " [%d/%d] [", conf->raid_disks,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) conf->raid_disks - mddev->degraded);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) for (i = 0; i < conf->raid_disks; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) struct md_rdev *rdev = rcu_dereference(conf->multipaths[i].rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) seq_printf (seq, "%s", rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) seq_putc(seq, ']');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) * Careful, this can execute in IRQ contexts as well!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static void multipath_error (struct mddev *mddev, struct md_rdev *rdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) struct mpconf *conf = mddev->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) char b[BDEVNAME_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) if (conf->raid_disks - mddev->degraded <= 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) * Uh oh, we can do nothing if this is our last path, but
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) * first check if this is a queued request for a device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) * which has just failed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) pr_warn("multipath: only one IO path left and IO error.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) /* leave it active... it's all we have */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) * Mark disk as unusable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) if (test_and_clear_bit(In_sync, &rdev->flags)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) spin_lock_irqsave(&conf->device_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) mddev->degraded++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) spin_unlock_irqrestore(&conf->device_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) set_bit(Faulty, &rdev->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) pr_err("multipath: IO failure on %s, disabling IO path.\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) "multipath: Operation continuing on %d IO paths.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) bdevname(rdev->bdev, b),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) conf->raid_disks - mddev->degraded);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) static void print_multipath_conf (struct mpconf *conf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) struct multipath_info *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) pr_debug("MULTIPATH conf printout:\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) if (!conf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) pr_debug("(conf==NULL)\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) pr_debug(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) conf->raid_disks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) for (i = 0; i < conf->raid_disks; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) char b[BDEVNAME_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) tmp = conf->multipaths + i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) if (tmp->rdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) pr_debug(" disk%d, o:%d, dev:%s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) i,!test_bit(Faulty, &tmp->rdev->flags),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) bdevname(tmp->rdev->bdev,b));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) static int multipath_add_disk(struct mddev *mddev, struct md_rdev *rdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) struct mpconf *conf = mddev->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) int err = -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) int path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) struct multipath_info *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) int first = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) int last = mddev->raid_disks - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) if (rdev->raid_disk >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) first = last = rdev->raid_disk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) print_multipath_conf(conf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) for (path = first; path <= last; path++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) if ((p=conf->multipaths+path)->rdev == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) disk_stack_limits(mddev->gendisk, rdev->bdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) rdev->data_offset << 9);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) err = md_integrity_add_rdev(rdev, mddev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) spin_lock_irq(&conf->device_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) mddev->degraded--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) rdev->raid_disk = path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) set_bit(In_sync, &rdev->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) spin_unlock_irq(&conf->device_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) rcu_assign_pointer(p->rdev, rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) print_multipath_conf(conf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) static int multipath_remove_disk(struct mddev *mddev, struct md_rdev *rdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) struct mpconf *conf = mddev->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) int number = rdev->raid_disk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) struct multipath_info *p = conf->multipaths + number;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) print_multipath_conf(conf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) if (rdev == p->rdev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) if (test_bit(In_sync, &rdev->flags) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) atomic_read(&rdev->nr_pending)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) pr_warn("hot-remove-disk, slot %d is identified but is still operational!\n", number);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) err = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) goto abort;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) p->rdev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) if (!test_bit(RemoveSynchronized, &rdev->flags)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) synchronize_rcu();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) if (atomic_read(&rdev->nr_pending)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) /* lost the race, try later */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) err = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) p->rdev = rdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) goto abort;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) err = md_integrity_register(mddev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) abort:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) print_multipath_conf(conf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) * This is a kernel thread which:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) * 1. Retries failed read operations on working multipaths.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) * 2. Updates the raid superblock when problems encounter.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) * 3. Performs writes following reads for array syncronising.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) static void multipathd(struct md_thread *thread)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) struct mddev *mddev = thread->mddev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) struct multipath_bh *mp_bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) struct bio *bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) struct mpconf *conf = mddev->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) struct list_head *head = &conf->retry_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) md_check_recovery(mddev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) for (;;) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) char b[BDEVNAME_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) spin_lock_irqsave(&conf->device_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) if (list_empty(head))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) mp_bh = list_entry(head->prev, struct multipath_bh, retry_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) list_del(head->prev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) spin_unlock_irqrestore(&conf->device_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) bio = &mp_bh->bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) bio->bi_iter.bi_sector = mp_bh->master_bio->bi_iter.bi_sector;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) if ((mp_bh->path = multipath_map (conf))<0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) pr_err("multipath: %s: unrecoverable IO read error for block %llu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) bio_devname(bio, b),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) (unsigned long long)bio->bi_iter.bi_sector);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) multipath_end_bh_io(mp_bh, BLK_STS_IOERR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) pr_err("multipath: %s: redirecting sector %llu to another IO path\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) bio_devname(bio, b),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) (unsigned long long)bio->bi_iter.bi_sector);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) *bio = *(mp_bh->master_bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) bio->bi_iter.bi_sector +=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) conf->multipaths[mp_bh->path].rdev->data_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) bio_set_dev(bio, conf->multipaths[mp_bh->path].rdev->bdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) bio->bi_opf |= REQ_FAILFAST_TRANSPORT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) bio->bi_end_io = multipath_end_request;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) bio->bi_private = mp_bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) submit_bio_noacct(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) spin_unlock_irqrestore(&conf->device_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) static sector_t multipath_size(struct mddev *mddev, sector_t sectors, int raid_disks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) WARN_ONCE(sectors || raid_disks,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) "%s does not support generic reshape\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) return mddev->dev_sectors;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) static int multipath_run (struct mddev *mddev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) struct mpconf *conf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) int disk_idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) struct multipath_info *disk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) struct md_rdev *rdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) int working_disks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) if (md_check_no_bitmap(mddev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) if (mddev->level != LEVEL_MULTIPATH) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) pr_warn("multipath: %s: raid level not set to multipath IO (%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) mdname(mddev), mddev->level);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) * copy the already verified devices into our private MULTIPATH
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) * bookkeeping area. [whatever we allocate in multipath_run(),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) * should be freed in multipath_free()]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) conf = kzalloc(sizeof(struct mpconf), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) mddev->private = conf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) if (!conf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) conf->multipaths = kcalloc(mddev->raid_disks,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) sizeof(struct multipath_info),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) if (!conf->multipaths)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) goto out_free_conf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) working_disks = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) rdev_for_each(rdev, mddev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) disk_idx = rdev->raid_disk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) if (disk_idx < 0 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) disk_idx >= mddev->raid_disks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) disk = conf->multipaths + disk_idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) disk->rdev = rdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) disk_stack_limits(mddev->gendisk, rdev->bdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) rdev->data_offset << 9);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) if (!test_bit(Faulty, &rdev->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) working_disks++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) conf->raid_disks = mddev->raid_disks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) conf->mddev = mddev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) spin_lock_init(&conf->device_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) INIT_LIST_HEAD(&conf->retry_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) if (!working_disks) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) pr_warn("multipath: no operational IO paths for %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) mdname(mddev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) goto out_free_conf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) mddev->degraded = conf->raid_disks - working_disks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) ret = mempool_init_kmalloc_pool(&conf->pool, NR_RESERVED_BUFS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) sizeof(struct multipath_bh));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) goto out_free_conf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) mddev->thread = md_register_thread(multipathd, mddev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) "multipath");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) if (!mddev->thread)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) goto out_free_conf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) pr_info("multipath: array %s active with %d out of %d IO paths\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) mdname(mddev), conf->raid_disks - mddev->degraded,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) mddev->raid_disks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) * Ok, everything is just fine now
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) md_set_array_sectors(mddev, multipath_size(mddev, 0, 0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) if (md_integrity_register(mddev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) goto out_free_conf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) out_free_conf:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) mempool_exit(&conf->pool);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) kfree(conf->multipaths);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) kfree(conf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) mddev->private = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) static void multipath_free(struct mddev *mddev, void *priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) struct mpconf *conf = priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) mempool_exit(&conf->pool);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) kfree(conf->multipaths);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) kfree(conf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) static struct md_personality multipath_personality =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) .name = "multipath",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) .level = LEVEL_MULTIPATH,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) .make_request = multipath_make_request,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) .run = multipath_run,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) .free = multipath_free,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) .status = multipath_status,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) .error_handler = multipath_error,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) .hot_add_disk = multipath_add_disk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) .hot_remove_disk= multipath_remove_disk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) .size = multipath_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) static int __init multipath_init (void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) return register_md_personality (&multipath_personality);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) static void __exit multipath_exit (void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) unregister_md_personality (&multipath_personality);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) module_init(multipath_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) module_exit(multipath_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) MODULE_DESCRIPTION("simple multi-path personality for MD");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) MODULE_ALIAS("md-personality-7"); /* MULTIPATH */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) MODULE_ALIAS("md-multipath");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) MODULE_ALIAS("md-level--4");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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