From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- drivers/md/raid0.c | 788 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 788 insertions(+) create mode 100644 drivers/md/raid0.c (limited to 'drivers/md/raid0.c') diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c new file mode 100644 index 000000000..b536befd8 --- /dev/null +++ b/drivers/md/raid0.c @@ -0,0 +1,788 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + raid0.c : Multiple Devices driver for Linux + Copyright (C) 1994-96 Marc ZYNGIER + or + + Copyright (C) 1999, 2000 Ingo Molnar, Red Hat + + RAID-0 management functions. + +*/ + +#include +#include +#include +#include +#include +#include "md.h" +#include "raid0.h" +#include "raid5.h" + +static int default_layout = 0; +module_param(default_layout, int, 0644); + +#define UNSUPPORTED_MDDEV_FLAGS \ + ((1L << MD_HAS_JOURNAL) | \ + (1L << MD_JOURNAL_CLEAN) | \ + (1L << MD_FAILFAST_SUPPORTED) |\ + (1L << MD_HAS_PPL) | \ + (1L << MD_HAS_MULTIPLE_PPLS)) + +/* + * inform the user of the raid configuration +*/ +static void dump_zones(struct mddev *mddev) +{ + int j, k; + sector_t zone_size = 0; + sector_t zone_start = 0; + struct r0conf *conf = mddev->private; + int raid_disks = conf->strip_zone[0].nb_dev; + pr_debug("md: RAID0 configuration for %s - %d zone%s\n", + mdname(mddev), + conf->nr_strip_zones, conf->nr_strip_zones==1?"":"s"); + for (j = 0; j < conf->nr_strip_zones; j++) { + char line[200]; + int len = 0; + + for (k = 0; k < conf->strip_zone[j].nb_dev; k++) + len += scnprintf(line+len, 200-len, "%s%pg", k?"/":"", + conf->devlist[j * raid_disks + k]->bdev); + pr_debug("md: zone%d=[%s]\n", j, line); + + zone_size = conf->strip_zone[j].zone_end - zone_start; + pr_debug(" zone-offset=%10lluKB, device-offset=%10lluKB, size=%10lluKB\n", + (unsigned long long)zone_start>>1, + (unsigned long long)conf->strip_zone[j].dev_start>>1, + (unsigned long long)zone_size>>1); + zone_start = conf->strip_zone[j].zone_end; + } +} + +static int create_strip_zones(struct mddev *mddev, struct r0conf **private_conf) +{ + int i, c, err; + sector_t curr_zone_end, sectors; + struct md_rdev *smallest, *rdev1, *rdev2, *rdev, **dev; + struct strip_zone *zone; + int cnt; + struct r0conf *conf = kzalloc(sizeof(*conf), GFP_KERNEL); + unsigned blksize = 512; + + *private_conf = ERR_PTR(-ENOMEM); + if (!conf) + return -ENOMEM; + rdev_for_each(rdev1, mddev) { + pr_debug("md/raid0:%s: looking at %pg\n", + mdname(mddev), + rdev1->bdev); + c = 0; + + /* round size to chunk_size */ + sectors = rdev1->sectors; + sector_div(sectors, mddev->chunk_sectors); + rdev1->sectors = sectors * mddev->chunk_sectors; + + blksize = max(blksize, queue_logical_block_size( + rdev1->bdev->bd_disk->queue)); + + rdev_for_each(rdev2, mddev) { + pr_debug("md/raid0:%s: comparing %pg(%llu)" + " with %pg(%llu)\n", + mdname(mddev), + rdev1->bdev, + (unsigned long long)rdev1->sectors, + rdev2->bdev, + (unsigned long long)rdev2->sectors); + if (rdev2 == rdev1) { + pr_debug("md/raid0:%s: END\n", + mdname(mddev)); + break; + } + if (rdev2->sectors == rdev1->sectors) { + /* + * Not unique, don't count it as a new + * group + */ + pr_debug("md/raid0:%s: EQUAL\n", + mdname(mddev)); + c = 1; + break; + } + pr_debug("md/raid0:%s: NOT EQUAL\n", + mdname(mddev)); + } + if (!c) { + pr_debug("md/raid0:%s: ==> UNIQUE\n", + mdname(mddev)); + conf->nr_strip_zones++; + pr_debug("md/raid0:%s: %d zones\n", + mdname(mddev), conf->nr_strip_zones); + } + } + pr_debug("md/raid0:%s: FINAL %d zones\n", + mdname(mddev), conf->nr_strip_zones); + + /* + * now since we have the hard sector sizes, we can make sure + * chunk size is a multiple of that sector size + */ + if ((mddev->chunk_sectors << 9) % blksize) { + pr_warn("md/raid0:%s: chunk_size of %d not multiple of block size %d\n", + mdname(mddev), + mddev->chunk_sectors << 9, blksize); + err = -EINVAL; + goto abort; + } + + err = -ENOMEM; + conf->strip_zone = kcalloc(conf->nr_strip_zones, + sizeof(struct strip_zone), + GFP_KERNEL); + if (!conf->strip_zone) + goto abort; + conf->devlist = kzalloc(array3_size(sizeof(struct md_rdev *), + conf->nr_strip_zones, + mddev->raid_disks), + GFP_KERNEL); + if (!conf->devlist) + goto abort; + + /* The first zone must contain all devices, so here we check that + * there is a proper alignment of slots to devices and find them all + */ + zone = &conf->strip_zone[0]; + cnt = 0; + smallest = NULL; + dev = conf->devlist; + err = -EINVAL; + rdev_for_each(rdev1, mddev) { + int j = rdev1->raid_disk; + + if (mddev->level == 10) { + /* taking over a raid10-n2 array */ + j /= 2; + rdev1->new_raid_disk = j; + } + + if (mddev->level == 1) { + /* taiking over a raid1 array- + * we have only one active disk + */ + j = 0; + rdev1->new_raid_disk = j; + } + + if (j < 0) { + pr_warn("md/raid0:%s: remove inactive devices before converting to RAID0\n", + mdname(mddev)); + goto abort; + } + if (j >= mddev->raid_disks) { + pr_warn("md/raid0:%s: bad disk number %d - aborting!\n", + mdname(mddev), j); + goto abort; + } + if (dev[j]) { + pr_warn("md/raid0:%s: multiple devices for %d - aborting!\n", + mdname(mddev), j); + goto abort; + } + dev[j] = rdev1; + + if (!smallest || (rdev1->sectors < smallest->sectors)) + smallest = rdev1; + cnt++; + } + if (cnt != mddev->raid_disks) { + pr_warn("md/raid0:%s: too few disks (%d of %d) - aborting!\n", + mdname(mddev), cnt, mddev->raid_disks); + goto abort; + } + zone->nb_dev = cnt; + zone->zone_end = smallest->sectors * cnt; + + curr_zone_end = zone->zone_end; + + /* now do the other zones */ + for (i = 1; i < conf->nr_strip_zones; i++) + { + int j; + + zone = conf->strip_zone + i; + dev = conf->devlist + i * mddev->raid_disks; + + pr_debug("md/raid0:%s: zone %d\n", mdname(mddev), i); + zone->dev_start = smallest->sectors; + smallest = NULL; + c = 0; + + for (j=0; jdevlist[j]; + if (rdev->sectors <= zone->dev_start) { + pr_debug("md/raid0:%s: checking %pg ... nope\n", + mdname(mddev), + rdev->bdev); + continue; + } + pr_debug("md/raid0:%s: checking %pg ..." + " contained as device %d\n", + mdname(mddev), + rdev->bdev, c); + dev[c] = rdev; + c++; + if (!smallest || rdev->sectors < smallest->sectors) { + smallest = rdev; + pr_debug("md/raid0:%s: (%llu) is smallest!.\n", + mdname(mddev), + (unsigned long long)rdev->sectors); + } + } + + zone->nb_dev = c; + sectors = (smallest->sectors - zone->dev_start) * c; + pr_debug("md/raid0:%s: zone->nb_dev: %d, sectors: %llu\n", + mdname(mddev), + zone->nb_dev, (unsigned long long)sectors); + + curr_zone_end += sectors; + zone->zone_end = curr_zone_end; + + pr_debug("md/raid0:%s: current zone start: %llu\n", + mdname(mddev), + (unsigned long long)smallest->sectors); + } + + if (conf->nr_strip_zones == 1 || conf->strip_zone[1].nb_dev == 1) { + conf->layout = RAID0_ORIG_LAYOUT; + } else if (mddev->layout == RAID0_ORIG_LAYOUT || + mddev->layout == RAID0_ALT_MULTIZONE_LAYOUT) { + conf->layout = mddev->layout; + } else if (default_layout == RAID0_ORIG_LAYOUT || + default_layout == RAID0_ALT_MULTIZONE_LAYOUT) { + conf->layout = default_layout; + } else { + pr_err("md/raid0:%s: cannot assemble multi-zone RAID0 with default_layout setting\n", + mdname(mddev)); + pr_err("md/raid0: please set raid0.default_layout to 1 or 2\n"); + err = -EOPNOTSUPP; + goto abort; + } + + pr_debug("md/raid0:%s: done.\n", mdname(mddev)); + *private_conf = conf; + + return 0; +abort: + kfree(conf->strip_zone); + kfree(conf->devlist); + kfree(conf); + *private_conf = ERR_PTR(err); + return err; +} + +/* Find the zone which holds a particular offset + * Update *sectorp to be an offset in that zone + */ +static struct strip_zone *find_zone(struct r0conf *conf, + sector_t *sectorp) +{ + int i; + struct strip_zone *z = conf->strip_zone; + sector_t sector = *sectorp; + + for (i = 0; i < conf->nr_strip_zones; i++) + if (sector < z[i].zone_end) { + if (i) + *sectorp = sector - z[i-1].zone_end; + return z + i; + } + BUG(); +} + +/* + * remaps the bio to the target device. we separate two flows. + * power 2 flow and a general flow for the sake of performance +*/ +static struct md_rdev *map_sector(struct mddev *mddev, struct strip_zone *zone, + sector_t sector, sector_t *sector_offset) +{ + unsigned int sect_in_chunk; + sector_t chunk; + struct r0conf *conf = mddev->private; + int raid_disks = conf->strip_zone[0].nb_dev; + unsigned int chunk_sects = mddev->chunk_sectors; + + if (is_power_of_2(chunk_sects)) { + int chunksect_bits = ffz(~chunk_sects); + /* find the sector offset inside the chunk */ + sect_in_chunk = sector & (chunk_sects - 1); + sector >>= chunksect_bits; + /* chunk in zone */ + chunk = *sector_offset; + /* quotient is the chunk in real device*/ + sector_div(chunk, zone->nb_dev << chunksect_bits); + } else{ + sect_in_chunk = sector_div(sector, chunk_sects); + chunk = *sector_offset; + sector_div(chunk, chunk_sects * zone->nb_dev); + } + /* + * position the bio over the real device + * real sector = chunk in device + starting of zone + * + the position in the chunk + */ + *sector_offset = (chunk * chunk_sects) + sect_in_chunk; + return conf->devlist[(zone - conf->strip_zone)*raid_disks + + sector_div(sector, zone->nb_dev)]; +} + +static sector_t raid0_size(struct mddev *mddev, sector_t sectors, int raid_disks) +{ + sector_t array_sectors = 0; + struct md_rdev *rdev; + + WARN_ONCE(sectors || raid_disks, + "%s does not support generic reshape\n", __func__); + + rdev_for_each(rdev, mddev) + array_sectors += (rdev->sectors & + ~(sector_t)(mddev->chunk_sectors-1)); + + return array_sectors; +} + +static void free_conf(struct mddev *mddev, struct r0conf *conf) +{ + kfree(conf->strip_zone); + kfree(conf->devlist); + kfree(conf); +} + +static void raid0_free(struct mddev *mddev, void *priv) +{ + struct r0conf *conf = priv; + + free_conf(mddev, conf); + acct_bioset_exit(mddev); +} + +static int raid0_run(struct mddev *mddev) +{ + struct r0conf *conf; + int ret; + + if (mddev->chunk_sectors == 0) { + pr_warn("md/raid0:%s: chunk size must be set.\n", mdname(mddev)); + return -EINVAL; + } + if (md_check_no_bitmap(mddev)) + return -EINVAL; + + if (acct_bioset_init(mddev)) { + pr_err("md/raid0:%s: alloc acct bioset failed.\n", mdname(mddev)); + return -ENOMEM; + } + + /* if private is not null, we are here after takeover */ + if (mddev->private == NULL) { + ret = create_strip_zones(mddev, &conf); + if (ret < 0) + goto exit_acct_set; + mddev->private = conf; + } + conf = mddev->private; + if (mddev->queue) { + struct md_rdev *rdev; + + blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors); + blk_queue_max_write_zeroes_sectors(mddev->queue, mddev->chunk_sectors); + + blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9); + blk_queue_io_opt(mddev->queue, + (mddev->chunk_sectors << 9) * mddev->raid_disks); + + rdev_for_each(rdev, mddev) { + disk_stack_limits(mddev->gendisk, rdev->bdev, + rdev->data_offset << 9); + } + } + + /* calculate array device size */ + md_set_array_sectors(mddev, raid0_size(mddev, 0, 0)); + + pr_debug("md/raid0:%s: md_size is %llu sectors.\n", + mdname(mddev), + (unsigned long long)mddev->array_sectors); + + dump_zones(mddev); + + ret = md_integrity_register(mddev); + if (ret) + goto free; + + return ret; + +free: + free_conf(mddev, conf); +exit_acct_set: + acct_bioset_exit(mddev); + return ret; +} + +static void raid0_handle_discard(struct mddev *mddev, struct bio *bio) +{ + struct r0conf *conf = mddev->private; + struct strip_zone *zone; + sector_t start = bio->bi_iter.bi_sector; + sector_t end; + unsigned int stripe_size; + sector_t first_stripe_index, last_stripe_index; + sector_t start_disk_offset; + unsigned int start_disk_index; + sector_t end_disk_offset; + unsigned int end_disk_index; + unsigned int disk; + + zone = find_zone(conf, &start); + + if (bio_end_sector(bio) > zone->zone_end) { + struct bio *split = bio_split(bio, + zone->zone_end - bio->bi_iter.bi_sector, GFP_NOIO, + &mddev->bio_set); + bio_chain(split, bio); + submit_bio_noacct(bio); + bio = split; + end = zone->zone_end; + } else + end = bio_end_sector(bio); + + if (zone != conf->strip_zone) + end = end - zone[-1].zone_end; + + /* Now start and end is the offset in zone */ + stripe_size = zone->nb_dev * mddev->chunk_sectors; + + first_stripe_index = start; + sector_div(first_stripe_index, stripe_size); + last_stripe_index = end; + sector_div(last_stripe_index, stripe_size); + + start_disk_index = (int)(start - first_stripe_index * stripe_size) / + mddev->chunk_sectors; + start_disk_offset = ((int)(start - first_stripe_index * stripe_size) % + mddev->chunk_sectors) + + first_stripe_index * mddev->chunk_sectors; + end_disk_index = (int)(end - last_stripe_index * stripe_size) / + mddev->chunk_sectors; + end_disk_offset = ((int)(end - last_stripe_index * stripe_size) % + mddev->chunk_sectors) + + last_stripe_index * mddev->chunk_sectors; + + for (disk = 0; disk < zone->nb_dev; disk++) { + sector_t dev_start, dev_end; + struct md_rdev *rdev; + + if (disk < start_disk_index) + dev_start = (first_stripe_index + 1) * + mddev->chunk_sectors; + else if (disk > start_disk_index) + dev_start = first_stripe_index * mddev->chunk_sectors; + else + dev_start = start_disk_offset; + + if (disk < end_disk_index) + dev_end = (last_stripe_index + 1) * mddev->chunk_sectors; + else if (disk > end_disk_index) + dev_end = last_stripe_index * mddev->chunk_sectors; + else + dev_end = end_disk_offset; + + if (dev_end <= dev_start) + continue; + + rdev = conf->devlist[(zone - conf->strip_zone) * + conf->strip_zone[0].nb_dev + disk]; + md_submit_discard_bio(mddev, rdev, bio, + dev_start + zone->dev_start + rdev->data_offset, + dev_end - dev_start); + } + bio_endio(bio); +} + +static bool raid0_make_request(struct mddev *mddev, struct bio *bio) +{ + struct r0conf *conf = mddev->private; + struct strip_zone *zone; + struct md_rdev *tmp_dev; + sector_t bio_sector; + sector_t sector; + sector_t orig_sector; + unsigned chunk_sects; + unsigned sectors; + + if (unlikely(bio->bi_opf & REQ_PREFLUSH) + && md_flush_request(mddev, bio)) + return true; + + if (unlikely((bio_op(bio) == REQ_OP_DISCARD))) { + raid0_handle_discard(mddev, bio); + return true; + } + + bio_sector = bio->bi_iter.bi_sector; + sector = bio_sector; + chunk_sects = mddev->chunk_sectors; + + sectors = chunk_sects - + (likely(is_power_of_2(chunk_sects)) + ? (sector & (chunk_sects-1)) + : sector_div(sector, chunk_sects)); + + /* Restore due to sector_div */ + sector = bio_sector; + + if (sectors < bio_sectors(bio)) { + struct bio *split = bio_split(bio, sectors, GFP_NOIO, + &mddev->bio_set); + bio_chain(split, bio); + submit_bio_noacct(bio); + bio = split; + } + + if (bio->bi_pool != &mddev->bio_set) + md_account_bio(mddev, &bio); + + orig_sector = sector; + zone = find_zone(mddev->private, §or); + switch (conf->layout) { + case RAID0_ORIG_LAYOUT: + tmp_dev = map_sector(mddev, zone, orig_sector, §or); + break; + case RAID0_ALT_MULTIZONE_LAYOUT: + tmp_dev = map_sector(mddev, zone, sector, §or); + break; + default: + WARN(1, "md/raid0:%s: Invalid layout\n", mdname(mddev)); + bio_io_error(bio); + return true; + } + + if (unlikely(is_mddev_broken(tmp_dev, "raid0"))) { + bio_io_error(bio); + return true; + } + + bio_set_dev(bio, tmp_dev->bdev); + bio->bi_iter.bi_sector = sector + zone->dev_start + + tmp_dev->data_offset; + + if (mddev->gendisk) + trace_block_bio_remap(bio, disk_devt(mddev->gendisk), + bio_sector); + mddev_check_write_zeroes(mddev, bio); + submit_bio_noacct(bio); + return true; +} + +static void raid0_status(struct seq_file *seq, struct mddev *mddev) +{ + seq_printf(seq, " %dk chunks", mddev->chunk_sectors / 2); + return; +} + +static void *raid0_takeover_raid45(struct mddev *mddev) +{ + struct md_rdev *rdev; + struct r0conf *priv_conf; + + if (mddev->degraded != 1) { + pr_warn("md/raid0:%s: raid5 must be degraded! Degraded disks: %d\n", + mdname(mddev), + mddev->degraded); + return ERR_PTR(-EINVAL); + } + + rdev_for_each(rdev, mddev) { + /* check slot number for a disk */ + if (rdev->raid_disk == mddev->raid_disks-1) { + pr_warn("md/raid0:%s: raid5 must have missing parity disk!\n", + mdname(mddev)); + return ERR_PTR(-EINVAL); + } + rdev->sectors = mddev->dev_sectors; + } + + /* Set new parameters */ + mddev->new_level = 0; + mddev->new_layout = 0; + mddev->new_chunk_sectors = mddev->chunk_sectors; + mddev->raid_disks--; + mddev->delta_disks = -1; + /* make sure it will be not marked as dirty */ + mddev->recovery_cp = MaxSector; + mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); + + create_strip_zones(mddev, &priv_conf); + + return priv_conf; +} + +static void *raid0_takeover_raid10(struct mddev *mddev) +{ + struct r0conf *priv_conf; + + /* Check layout: + * - far_copies must be 1 + * - near_copies must be 2 + * - disks number must be even + * - all mirrors must be already degraded + */ + if (mddev->layout != ((1 << 8) + 2)) { + pr_warn("md/raid0:%s:: Raid0 cannot takeover layout: 0x%x\n", + mdname(mddev), + mddev->layout); + return ERR_PTR(-EINVAL); + } + if (mddev->raid_disks & 1) { + pr_warn("md/raid0:%s: Raid0 cannot takeover Raid10 with odd disk number.\n", + mdname(mddev)); + return ERR_PTR(-EINVAL); + } + if (mddev->degraded != (mddev->raid_disks>>1)) { + pr_warn("md/raid0:%s: All mirrors must be already degraded!\n", + mdname(mddev)); + return ERR_PTR(-EINVAL); + } + + /* Set new parameters */ + mddev->new_level = 0; + mddev->new_layout = 0; + mddev->new_chunk_sectors = mddev->chunk_sectors; + mddev->delta_disks = - mddev->raid_disks / 2; + mddev->raid_disks += mddev->delta_disks; + mddev->degraded = 0; + /* make sure it will be not marked as dirty */ + mddev->recovery_cp = MaxSector; + mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); + + create_strip_zones(mddev, &priv_conf); + return priv_conf; +} + +static void *raid0_takeover_raid1(struct mddev *mddev) +{ + struct r0conf *priv_conf; + int chunksect; + + /* Check layout: + * - (N - 1) mirror drives must be already faulty + */ + if ((mddev->raid_disks - 1) != mddev->degraded) { + pr_err("md/raid0:%s: (N - 1) mirrors drives must be already faulty!\n", + mdname(mddev)); + return ERR_PTR(-EINVAL); + } + + /* + * a raid1 doesn't have the notion of chunk size, so + * figure out the largest suitable size we can use. + */ + chunksect = 64 * 2; /* 64K by default */ + + /* The array must be an exact multiple of chunksize */ + while (chunksect && (mddev->array_sectors & (chunksect - 1))) + chunksect >>= 1; + + if ((chunksect << 9) < PAGE_SIZE) + /* array size does not allow a suitable chunk size */ + return ERR_PTR(-EINVAL); + + /* Set new parameters */ + mddev->new_level = 0; + mddev->new_layout = 0; + mddev->new_chunk_sectors = chunksect; + mddev->chunk_sectors = chunksect; + mddev->delta_disks = 1 - mddev->raid_disks; + mddev->raid_disks = 1; + /* make sure it will be not marked as dirty */ + mddev->recovery_cp = MaxSector; + mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); + + create_strip_zones(mddev, &priv_conf); + return priv_conf; +} + +static void *raid0_takeover(struct mddev *mddev) +{ + /* raid0 can take over: + * raid4 - if all data disks are active. + * raid5 - providing it is Raid4 layout and one disk is faulty + * raid10 - assuming we have all necessary active disks + * raid1 - with (N -1) mirror drives faulty + */ + + if (mddev->bitmap) { + pr_warn("md/raid0: %s: cannot takeover array with bitmap\n", + mdname(mddev)); + return ERR_PTR(-EBUSY); + } + if (mddev->level == 4) + return raid0_takeover_raid45(mddev); + + if (mddev->level == 5) { + if (mddev->layout == ALGORITHM_PARITY_N) + return raid0_takeover_raid45(mddev); + + pr_warn("md/raid0:%s: Raid can only takeover Raid5 with layout: %d\n", + mdname(mddev), ALGORITHM_PARITY_N); + } + + if (mddev->level == 10) + return raid0_takeover_raid10(mddev); + + if (mddev->level == 1) + return raid0_takeover_raid1(mddev); + + pr_warn("Takeover from raid%i to raid0 not supported\n", + mddev->level); + + return ERR_PTR(-EINVAL); +} + +static void raid0_quiesce(struct mddev *mddev, int quiesce) +{ +} + +static struct md_personality raid0_personality= +{ + .name = "raid0", + .level = 0, + .owner = THIS_MODULE, + .make_request = raid0_make_request, + .run = raid0_run, + .free = raid0_free, + .status = raid0_status, + .size = raid0_size, + .takeover = raid0_takeover, + .quiesce = raid0_quiesce, +}; + +static int __init raid0_init (void) +{ + return register_md_personality (&raid0_personality); +} + +static void raid0_exit (void) +{ + unregister_md_personality (&raid0_personality); +} + +module_init(raid0_init); +module_exit(raid0_exit); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("RAID0 (striping) personality for MD"); +MODULE_ALIAS("md-personality-2"); /* RAID0 */ +MODULE_ALIAS("md-raid0"); +MODULE_ALIAS("md-level-0"); -- cgit v1.2.3