^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) linear.c : Multiple Devices driver for Linux
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) Copyright (C) 1994-96 Marc ZYNGIER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) <zyngier@ufr-info-p7.ibp.fr> or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) <maz@gloups.fdn.fr>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) Linear mode management functions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/blkdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/raid/md_u.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/seq_file.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/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <trace/events/block.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include "md.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include "md-linear.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * find which device holds a particular offset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static inline struct dev_info *which_dev(struct mddev *mddev, sector_t sector)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) int lo, mid, hi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct linear_conf *conf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) lo = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) hi = mddev->raid_disks - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) conf = mddev->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * Binary Search
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) while (hi > lo) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) mid = (hi + lo) / 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) if (sector < conf->disks[mid].end_sector)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) hi = mid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) lo = mid + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) return conf->disks + lo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) static sector_t linear_size(struct mddev *mddev, sector_t sectors, int raid_disks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) struct linear_conf *conf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) sector_t array_sectors;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) conf = mddev->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) WARN_ONCE(sectors || raid_disks,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) "%s does not support generic reshape\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) array_sectors = conf->array_sectors;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) return array_sectors;
^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) static struct linear_conf *linear_conf(struct mddev *mddev, int raid_disks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) struct linear_conf *conf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) struct md_rdev *rdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) int i, cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) bool discard_supported = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) conf = kzalloc(struct_size(conf, disks, raid_disks), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) if (!conf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) cnt = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) conf->array_sectors = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) rdev_for_each(rdev, mddev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) int j = rdev->raid_disk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) struct dev_info *disk = conf->disks + j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) sector_t sectors;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) if (j < 0 || j >= raid_disks || disk->rdev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) pr_warn("md/linear:%s: disk numbering problem. Aborting!\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) mdname(mddev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) disk->rdev = rdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) if (mddev->chunk_sectors) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) sectors = rdev->sectors;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) sector_div(sectors, mddev->chunk_sectors);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) rdev->sectors = sectors * mddev->chunk_sectors;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) disk_stack_limits(mddev->gendisk, rdev->bdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) rdev->data_offset << 9);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) conf->array_sectors += rdev->sectors;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) cnt++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) if (blk_queue_discard(bdev_get_queue(rdev->bdev)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) discard_supported = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if (cnt != raid_disks) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) pr_warn("md/linear:%s: not enough drives present. Aborting!\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) mdname(mddev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) if (!discard_supported)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) blk_queue_flag_clear(QUEUE_FLAG_DISCARD, mddev->queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) blk_queue_flag_set(QUEUE_FLAG_DISCARD, mddev->queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) * Here we calculate the device offsets.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) conf->disks[0].end_sector = conf->disks[0].rdev->sectors;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) for (i = 1; i < raid_disks; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) conf->disks[i].end_sector =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) conf->disks[i-1].end_sector +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) conf->disks[i].rdev->sectors;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) * conf->raid_disks is copy of mddev->raid_disks. The reason to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) * keep a copy of mddev->raid_disks in struct linear_conf is,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) * mddev->raid_disks may not be consistent with pointers number of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) * conf->disks[] when it is updated in linear_add() and used to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) * iterate old conf->disks[] earray in linear_congested().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) * Here conf->raid_disks is always consitent with number of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) * pointers in conf->disks[] array, and mddev->private is updated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) * with rcu_assign_pointer() in linear_addr(), such race can be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) * avoided.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) conf->raid_disks = raid_disks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) return conf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) kfree(conf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) static int linear_run (struct mddev *mddev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) struct linear_conf *conf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if (md_check_no_bitmap(mddev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) conf = linear_conf(mddev, mddev->raid_disks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) if (!conf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) mddev->private = conf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) md_set_array_sectors(mddev, linear_size(mddev, 0, 0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) ret = md_integrity_register(mddev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) kfree(conf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) mddev->private = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) static int linear_add(struct mddev *mddev, struct md_rdev *rdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) /* Adding a drive to a linear array allows the array to grow.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) * It is permitted if the new drive has a matching superblock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) * already on it, with raid_disk equal to raid_disks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) * It is achieved by creating a new linear_private_data structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) * and swapping it in in-place of the current one.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) * The current one is never freed until the array is stopped.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) * This avoids races.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) struct linear_conf *newconf, *oldconf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) if (rdev->saved_raid_disk != mddev->raid_disks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) rdev->raid_disk = rdev->saved_raid_disk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) rdev->saved_raid_disk = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) newconf = linear_conf(mddev,mddev->raid_disks+1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) if (!newconf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) /* newconf->raid_disks already keeps a copy of * the increased
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) * value of mddev->raid_disks, WARN_ONCE() is just used to make
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) * sure of this. It is possible that oldconf is still referenced
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) * in linear_congested(), therefore kfree_rcu() is used to free
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) * oldconf until no one uses it anymore.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) mddev_suspend(mddev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) oldconf = rcu_dereference_protected(mddev->private,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) lockdep_is_held(&mddev->reconfig_mutex));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) mddev->raid_disks++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) WARN_ONCE(mddev->raid_disks != newconf->raid_disks,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) "copied raid_disks doesn't match mddev->raid_disks");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) rcu_assign_pointer(mddev->private, newconf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) md_set_array_sectors(mddev, linear_size(mddev, 0, 0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) set_capacity(mddev->gendisk, mddev->array_sectors);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) mddev_resume(mddev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) revalidate_disk_size(mddev->gendisk, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) kfree_rcu(oldconf, rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) static void linear_free(struct mddev *mddev, void *priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) struct linear_conf *conf = priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) kfree(conf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) static bool linear_make_request(struct mddev *mddev, struct bio *bio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) char b[BDEVNAME_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) struct dev_info *tmp_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) sector_t start_sector, end_sector, data_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) sector_t bio_sector = bio->bi_iter.bi_sector;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) if (unlikely(bio->bi_opf & REQ_PREFLUSH)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) && md_flush_request(mddev, bio))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) tmp_dev = which_dev(mddev, bio_sector);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) start_sector = tmp_dev->end_sector - tmp_dev->rdev->sectors;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) end_sector = tmp_dev->end_sector;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) data_offset = tmp_dev->rdev->data_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) if (unlikely(bio_sector >= end_sector ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) bio_sector < start_sector))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) goto out_of_bounds;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) if (unlikely(is_mddev_broken(tmp_dev->rdev, "linear"))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) bio_io_error(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) if (unlikely(bio_end_sector(bio) > end_sector)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) /* This bio crosses a device boundary, so we have to split it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) struct bio *split = bio_split(bio, end_sector - bio_sector,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) GFP_NOIO, &mddev->bio_set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) bio_chain(split, bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) submit_bio_noacct(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) bio = split;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) bio_set_dev(bio, tmp_dev->rdev->bdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) bio->bi_iter.bi_sector = bio->bi_iter.bi_sector -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) start_sector + data_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) if (unlikely((bio_op(bio) == REQ_OP_DISCARD) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) !blk_queue_discard(bio->bi_disk->queue))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) /* Just ignore it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) bio_endio(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) if (mddev->gendisk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) trace_block_bio_remap(bio->bi_disk->queue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) bio, disk_devt(mddev->gendisk),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) bio_sector);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) mddev_check_writesame(mddev, bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) mddev_check_write_zeroes(mddev, bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) submit_bio_noacct(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) out_of_bounds:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) pr_err("md/linear:%s: make_request: Sector %llu out of bounds on dev %s: %llu sectors, offset %llu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) mdname(mddev),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) (unsigned long long)bio->bi_iter.bi_sector,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) bdevname(tmp_dev->rdev->bdev, b),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) (unsigned long long)tmp_dev->rdev->sectors,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) (unsigned long long)start_sector);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) bio_io_error(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) static void linear_status (struct seq_file *seq, struct mddev *mddev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) seq_printf(seq, " %dk rounding", mddev->chunk_sectors / 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) static void linear_quiesce(struct mddev *mddev, int state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) static struct md_personality linear_personality =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) .name = "linear",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) .level = LEVEL_LINEAR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) .make_request = linear_make_request,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) .run = linear_run,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) .free = linear_free,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) .status = linear_status,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) .hot_add_disk = linear_add,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) .size = linear_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) .quiesce = linear_quiesce,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) static int __init linear_init (void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) return register_md_personality (&linear_personality);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) static void linear_exit (void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) unregister_md_personality (&linear_personality);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) module_init(linear_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) module_exit(linear_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) MODULE_DESCRIPTION("Linear device concatenation personality for MD");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) MODULE_ALIAS("md-personality-1"); /* LINEAR - deprecated*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) MODULE_ALIAS("md-linear");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) MODULE_ALIAS("md-level--1");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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