45991f3d2a
* refs/heads/tmp-26bf816: Linux 4.19.18 ipmi: Don't initialize anything in the core until something uses it ipmi:ssif: Fix handling of multi-part return messages ipmi: Prevent use-after-free in deliver_response ipmi: msghandler: Fix potential Spectre v1 vulnerabilities ipmi: fix use-after-free of user->release_barrier.rda Bluetooth: Fix unnecessary error message for HCI request completion iwlwifi: mvm: Send LQ command as async when necessary mm, proc: be more verbose about unstable VMA flags in /proc/<pid>/smaps userfaultfd: clear flag if remap event not enabled mm/swap: use nr_node_ids for avail_lists in swap_info_struct mm/page-writeback.c: don't break integrity writeback on ->writepage() error ocfs2: fix panic due to unrecovered local alloc iomap: don't search past page end in iomap_is_partially_uptodate scsi: megaraid: fix out-of-bound array accesses scsi: smartpqi: call pqi_free_interrupts() in pqi_shutdown() ath10k: fix peer stats null pointer dereference scsi: smartpqi: correct lun reset issues scsi: mpt3sas: fix memory ordering on 64bit writes IB/usnic: Fix potential deadlock sysfs: Disable lockdep for driver bind/unbind files ALSA: bebob: fix model-id of unit for Apogee Ensemble Bluetooth: btusb: Add support for Intel bluetooth device 8087:0029 dm: Check for device sector overflow if CONFIG_LBDAF is not set clocksource/drivers/integrator-ap: Add missing of_node_put() quota: Lock s_umount in exclusive mode for Q_XQUOTA{ON,OFF} quotactls. perf tools: Add missing open_memstream() prototype for systems lacking it perf tools: Add missing sigqueue() prototype for systems lacking it perf cs-etm: Correct packets swapping in cs_etm__flush() dm snapshot: Fix excessive memory usage and workqueue stalls tools lib subcmd: Don't add the kernel sources to the include path perf stat: Avoid segfaults caused by negated options dm kcopyd: Fix bug causing workqueue stalls dm crypt: use u64 instead of sector_t to store iv_offset x86/topology: Use total_cpus for max logical packages calculation netfilter: ipt_CLUSTERIP: fix deadlock in netns exit routine netfilter: ipt_CLUSTERIP: remove wrong WARN_ON_ONCE in netns exit routine netfilter: ipt_CLUSTERIP: check MAC address when duplicate config is set perf vendor events intel: Fix Load_Miss_Real_Latency on SKL/SKX perf parse-events: Fix unchecked usage of strncpy() perf svghelper: Fix unchecked usage of strncpy() perf tests ARM: Disable breakpoint tests 32-bit perf intel-pt: Fix error with config term "pt=0" tty/serial: do not free trasnmit buffer page under port lock btrfs: improve error handling of btrfs_add_link btrfs: fix use-after-free due to race between replace start and cancel btrfs: alloc_chunk: fix more DUP stripe size handling btrfs: volumes: Make sure there is no overlap of dev extents at mount time mmc: atmel-mci: do not assume idle after atmci_request_end kconfig: fix memory leak when EOF is encountered in quotation kconfig: fix file name and line number of warn_ignored_character() bpf: relax verifier restriction on BPF_MOV | BPF_ALU arm64: Fix minor issues with the dcache_by_line_op macro clk: imx6q: reset exclusive gates on init arm64: kasan: Increase stack size for KASAN_EXTRA selftests: do not macro-expand failed assertion expressions scsi: target/core: Make sure that target_wait_for_sess_cmds() waits long enough scsi: target: use consistent left-aligned ASCII INQUIRY data net: call sk_dst_reset when set SO_DONTROUTE staging: erofs: fix use-after-free of on-stack `z_erofs_vle_unzip_io' media: venus: core: Set dma maximum segment size ASoC: use dma_ops of parent device for acp_audio_dma media: firewire: Fix app_info parameter type in avc_ca{,_app}_info powerpc/pseries/cpuidle: Fix preempt warning powerpc/xmon: Fix invocation inside lock region media: uvcvideo: Refactor teardown of uvc on USB disconnect pstore/ram: Do not treat empty buffers as valid clk: imx: make mux parent strings const jffs2: Fix use of uninitialized delayed_work, lockdep breakage efi/libstub: Disable some warnings for x86{,_64} rxe: IB_WR_REG_MR does not capture MR's iova field drm/amdgpu: Reorder uvd ring init before uvd resume scsi: qedi: Check for session online before getting iSCSI TLV data. ASoC: pcm3168a: Don't disable pcm3168a when CONFIG_PM defined selinux: always allow mounting submounts fpga: altera-cvp: fix probing for multiple FPGAs on the bus usb: gadget: udc: renesas_usb3: add a safety connection way for forced_b_device samples: bpf: fix: error handling regarding kprobe_events clk: meson: meson8b: fix incorrect divider mapping in cpu_scale_table drm/atomic-helper: Complete fake_commit->flip_done potentially earlier arm64: perf: set suppress_bind_attrs flag to true crypto: ecc - regularize scalar for scalar multiplication MIPS: SiByte: Enable swiotlb for SWARM, LittleSur and BigSur x86/mce: Fix -Wmissing-prototypes warnings ALSA: oxfw: add support for APOGEE duet FireWire bpf: Allow narrow loads with offset > 0 serial: set suppress_bind_attrs flag only if builtin writeback: don't decrement wb->refcnt if !wb->bdi of: overlay: add missing of_node_put() after add new node to changeset selftests/bpf: enable (uncomment) all tests in test_libbpf.sh usb: typec: tcpm: Do not disconnect link for self powered devices e1000e: allow non-monotonic SYSTIM readings platform/x86: asus-wmi: Tell the EC the OS will handle the display off hotkey ixgbe: allow IPsec Tx offload in VEPA mode drm/amdkfd: fix interrupt spin lock drm/amd/display: Guard against null stream_state in set_crc_source gpio: pl061: Move irq_chip definition inside struct pl061 netfilter: ipset: Allow matching on destination MAC address for mac and ipmac sets net: clear skb->tstamp in bridge forwarding path ipv6: Take rcu_read_lock in __inet6_bind for mapped addresses r8169: Add support for new Realtek Ethernet qmi_wwan: add MTU default to qmap network interface net, skbuff: do not prefer skb allocation fails early net: dsa: mv88x6xxx: mv88e6390 errata mlxsw: spectrum_switchdev: Set PVID correctly during VLAN deletion mlxsw: spectrum: Disable lag port TX before removing it ipv6: Consider sk_bound_dev_if when binding a socket to a v4 mapped address UPSTREAM: dm: do not allow readahead to limit IO size UPSTREAM: ppp: Move PFC decompression to PPP generic layer UPSTREAM: l2tp: Add protocol field decompression Conflicts: include/linux/swap.h Change-Id: I72fecd7d04341015f9397afe60d8469d548b4cb6 Signed-off-by: Ivaylo Georgiev <irgeorgiev@codeaurora.org>
248 lines
5.8 KiB
C
248 lines
5.8 KiB
C
/*
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* Copyright (C) 2001-2003 Sistina Software (UK) Limited.
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*
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* This file is released under the GPL.
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*/
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#include "dm.h"
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/blkdev.h>
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#include <linux/bio.h>
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#include <linux/dax.h>
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#include <linux/slab.h>
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#include <linux/device-mapper.h>
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#define DM_MSG_PREFIX "linear"
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/*
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* Linear: maps a linear range of a device.
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*/
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struct linear_c {
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struct dm_dev *dev;
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sector_t start;
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};
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/*
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* Construct a linear mapping: <dev_path> <offset>
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*/
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int dm_linear_ctr(struct dm_target *ti, unsigned int argc, char **argv)
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{
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struct linear_c *lc;
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unsigned long long tmp;
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char dummy;
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int ret;
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if (argc != 2) {
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ti->error = "Invalid argument count";
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return -EINVAL;
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}
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lc = kmalloc(sizeof(*lc), GFP_KERNEL);
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if (lc == NULL) {
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ti->error = "Cannot allocate linear context";
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return -ENOMEM;
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}
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ret = -EINVAL;
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if (sscanf(argv[1], "%llu%c", &tmp, &dummy) != 1 || tmp != (sector_t)tmp) {
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ti->error = "Invalid device sector";
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goto bad;
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}
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lc->start = tmp;
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ret = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &lc->dev);
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if (ret) {
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ti->error = "Device lookup failed";
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goto bad;
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}
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ti->num_flush_bios = 1;
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ti->num_discard_bios = 1;
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ti->num_secure_erase_bios = 1;
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ti->num_write_same_bios = 1;
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ti->num_write_zeroes_bios = 1;
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ti->private = lc;
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return 0;
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bad:
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kfree(lc);
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return ret;
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}
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void dm_linear_dtr(struct dm_target *ti)
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{
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struct linear_c *lc = (struct linear_c *) ti->private;
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dm_put_device(ti, lc->dev);
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kfree(lc);
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}
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static sector_t linear_map_sector(struct dm_target *ti, sector_t bi_sector)
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{
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struct linear_c *lc = ti->private;
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return lc->start + dm_target_offset(ti, bi_sector);
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}
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static void linear_map_bio(struct dm_target *ti, struct bio *bio)
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{
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struct linear_c *lc = ti->private;
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bio_set_dev(bio, lc->dev->bdev);
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if (bio_sectors(bio) || bio_op(bio) == REQ_OP_ZONE_RESET)
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bio->bi_iter.bi_sector =
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linear_map_sector(ti, bio->bi_iter.bi_sector);
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}
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int dm_linear_map(struct dm_target *ti, struct bio *bio)
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{
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linear_map_bio(ti, bio);
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return DM_MAPIO_REMAPPED;
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}
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#ifdef CONFIG_BLK_DEV_ZONED
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int dm_linear_end_io(struct dm_target *ti, struct bio *bio,
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blk_status_t *error)
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{
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struct linear_c *lc = ti->private;
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if (!*error && bio_op(bio) == REQ_OP_ZONE_REPORT)
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dm_remap_zone_report(ti, bio, lc->start);
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return DM_ENDIO_DONE;
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}
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EXPORT_SYMBOL_GPL(dm_linear_end_io);
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#endif
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void dm_linear_status(struct dm_target *ti, status_type_t type,
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unsigned status_flags, char *result, unsigned maxlen)
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{
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struct linear_c *lc = (struct linear_c *) ti->private;
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switch (type) {
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case STATUSTYPE_INFO:
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result[0] = '\0';
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break;
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case STATUSTYPE_TABLE:
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snprintf(result, maxlen, "%s %llu", lc->dev->name,
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(unsigned long long)lc->start);
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break;
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}
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}
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int dm_linear_prepare_ioctl(struct dm_target *ti, struct block_device **bdev)
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{
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struct linear_c *lc = (struct linear_c *) ti->private;
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struct dm_dev *dev = lc->dev;
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*bdev = dev->bdev;
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/*
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* Only pass ioctls through if the device sizes match exactly.
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*/
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if (lc->start ||
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ti->len != i_size_read(dev->bdev->bd_inode) >> SECTOR_SHIFT)
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return 1;
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return 0;
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}
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int dm_linear_iterate_devices(struct dm_target *ti,
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iterate_devices_callout_fn fn, void *data)
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{
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struct linear_c *lc = ti->private;
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return fn(ti, lc->dev, lc->start, ti->len, data);
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}
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#if IS_ENABLED(CONFIG_DAX_DRIVER)
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long dm_linear_dax_direct_access(struct dm_target *ti, pgoff_t pgoff,
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long nr_pages, void **kaddr, pfn_t *pfn)
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{
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long ret;
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struct linear_c *lc = ti->private;
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struct block_device *bdev = lc->dev->bdev;
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struct dax_device *dax_dev = lc->dev->dax_dev;
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sector_t dev_sector, sector = pgoff * PAGE_SECTORS;
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dev_sector = linear_map_sector(ti, sector);
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ret = bdev_dax_pgoff(bdev, dev_sector, nr_pages * PAGE_SIZE, &pgoff);
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if (ret)
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return ret;
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return dax_direct_access(dax_dev, pgoff, nr_pages, kaddr, pfn);
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}
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EXPORT_SYMBOL_GPL(dm_linear_dax_direct_access);
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size_t dm_linear_dax_copy_from_iter(struct dm_target *ti, pgoff_t pgoff,
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void *addr, size_t bytes, struct iov_iter *i)
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{
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struct linear_c *lc = ti->private;
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struct block_device *bdev = lc->dev->bdev;
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struct dax_device *dax_dev = lc->dev->dax_dev;
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sector_t dev_sector, sector = pgoff * PAGE_SECTORS;
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dev_sector = linear_map_sector(ti, sector);
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if (bdev_dax_pgoff(bdev, dev_sector, ALIGN(bytes, PAGE_SIZE), &pgoff))
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return 0;
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return dax_copy_from_iter(dax_dev, pgoff, addr, bytes, i);
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}
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EXPORT_SYMBOL_GPL(dm_linear_dax_copy_from_iter);
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static size_t dm_linear_dax_copy_to_iter(struct dm_target *ti, pgoff_t pgoff,
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void *addr, size_t bytes, struct iov_iter *i)
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{
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struct linear_c *lc = ti->private;
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struct block_device *bdev = lc->dev->bdev;
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struct dax_device *dax_dev = lc->dev->dax_dev;
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sector_t dev_sector, sector = pgoff * PAGE_SECTORS;
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dev_sector = linear_map_sector(ti, sector);
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if (bdev_dax_pgoff(bdev, dev_sector, ALIGN(bytes, PAGE_SIZE), &pgoff))
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return 0;
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return dax_copy_to_iter(dax_dev, pgoff, addr, bytes, i);
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}
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#else
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#define dm_linear_dax_direct_access NULL
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#define dm_linear_dax_copy_from_iter NULL
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#define dm_linear_dax_copy_to_iter NULL
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#endif
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static struct target_type linear_target = {
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.name = "linear",
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.version = {1, 4, 0},
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#ifdef CONFIG_BLK_DEV_ZONED
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.end_io = dm_linear_end_io,
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.features = DM_TARGET_PASSES_INTEGRITY | DM_TARGET_ZONED_HM,
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#else
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.features = DM_TARGET_PASSES_INTEGRITY,
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#endif
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.module = THIS_MODULE,
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.ctr = dm_linear_ctr,
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.dtr = dm_linear_dtr,
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.map = dm_linear_map,
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.status = dm_linear_status,
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.prepare_ioctl = dm_linear_prepare_ioctl,
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.iterate_devices = dm_linear_iterate_devices,
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.direct_access = dm_linear_dax_direct_access,
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.dax_copy_from_iter = dm_linear_dax_copy_from_iter,
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.dax_copy_to_iter = dm_linear_dax_copy_to_iter,
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};
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int __init dm_linear_init(void)
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{
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int r = dm_register_target(&linear_target);
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if (r < 0)
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DMERR("register failed %d", r);
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return r;
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}
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void dm_linear_exit(void)
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{
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dm_unregister_target(&linear_target);
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}
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