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-----BEGIN PGP SIGNATURE----- iQJEBAABCAAuFiEEwPw5LcreJtl1+l5K99NY+ylx4KYFAl+EWUgQHGF4Ym9lQGtl cm5lbC5kawAKCRD301j7KXHgpnoxEADCVSNBRkpV0OVkOEC3wf8EGhXhk01Jnjtl u5Mg2V55hcgJ0thQxBV/V28XyqmsEBrmAVi0Yf8Vr9Qbq4Ze08Wae4ChS4rEOyh1 jTcGYWx5aJB3ChLvV/HI0nWQ3bkj03mMrL3SW8rhhf5DTyKHsVeTenpx42Qu/FKf fRzi09FSr3Pjd0B+EX6gunwJnlyXQC5Fa4AA0GhnXJzAznANXxHkkcXu8a6Yw75x e28CfhIBliORsK8sRHLoUnPpeTe1vtxCBhBMsE+gJAj9ZUOWMzvNFIPP4FvfawDy 6cCQo2m1azJ/IdZZCDjFUWyjh+wxdKMp+NNryEcoV+VlqIoc3n98rFwrSL+GIq5Z WVwEwq+AcwoMCsD29Lu1ytL2PQ/RVqcJP5UheMrbL4vzefNfJFumQVZLIcX0k943 8dFL2QHL+H/hM9Dx5y5rjeiWkAlq75v4xPKVjh/DHb4nehddCqn/+DD5HDhNANHf c1kmmEuYhvLpIaC4DHjE6DwLh8TPKahJjwsGuBOTr7D93NUQD+OOWsIhX6mNISIl FFhP8cd0/ZZVV//9j+q+5B4BaJsT+ZtwmrelKFnPdwPSnh+3iu8zPRRWO+8P8fRC YvddxuJAmE6BLmsAYrdz6Xb/wqfyV44cEiyivF0oBQfnhbtnXwDnkDWSfJD1bvCm ZwfpDh2+Tg== =LzyE -----END PGP SIGNATURE----- Merge tag 'block-5.10-2020-10-12' of git://git.kernel.dk/linux-block Pull block updates from Jens Axboe: - Series of merge handling cleanups (Baolin, Christoph) - Series of blk-throttle fixes and cleanups (Baolin) - Series cleaning up BDI, seperating the block device from the backing_dev_info (Christoph) - Removal of bdget() as a generic API (Christoph) - Removal of blkdev_get() as a generic API (Christoph) - Cleanup of is-partition checks (Christoph) - Series reworking disk revalidation (Christoph) - Series cleaning up bio flags (Christoph) - bio crypt fixes (Eric) - IO stats inflight tweak (Gabriel) - blk-mq tags fixes (Hannes) - Buffer invalidation fixes (Jan) - Allow soft limits for zone append (Johannes) - Shared tag set improvements (John, Kashyap) - Allow IOPRIO_CLASS_RT for CAP_SYS_NICE (Khazhismel) - DM no-wait support (Mike, Konstantin) - Request allocation improvements (Ming) - Allow md/dm/bcache to use IO stat helpers (Song) - Series improving blk-iocost (Tejun) - Various cleanups (Geert, Damien, Danny, Julia, Tetsuo, Tian, Wang, Xianting, Yang, Yufen, yangerkun) * tag 'block-5.10-2020-10-12' of git://git.kernel.dk/linux-block: (191 commits) block: fix uapi blkzoned.h comments blk-mq: move cancel of hctx->run_work to the front of blk_exit_queue blk-mq: get rid of the dead flush handle code path block: get rid of unnecessary local variable block: fix comment and add lockdep assert blk-mq: use helper function to test hw stopped block: use helper function to test queue register block: remove redundant mq check block: invoke blk_mq_exit_sched no matter whether have .exit_sched percpu_ref: don't refer to ref->data if it isn't allocated block: ratelimit handle_bad_sector() message blk-throttle: Re-use the throtl_set_slice_end() blk-throttle: Open code __throtl_de/enqueue_tg() blk-throttle: Move service tree validation out of the throtl_rb_first() blk-throttle: Move the list operation after list validation blk-throttle: Fix IO hang for a corner case blk-throttle: Avoid tracking latency if low limit is invalid blk-throttle: Avoid getting the current time if tg->last_finish_time is 0 blk-throttle: Remove a meaningless parameter for throtl_downgrade_state() block: Remove redundant 'return' statement ...
796 lines
19 KiB
C
796 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 1991-1998 Linus Torvalds
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* Re-organised Feb 1998 Russell King
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*/
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/ctype.h>
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#include <linux/genhd.h>
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#include <linux/vmalloc.h>
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#include <linux/blktrace_api.h>
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#include <linux/raid/detect.h>
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#include "check.h"
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static int (*check_part[])(struct parsed_partitions *) = {
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/*
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* Probe partition formats with tables at disk address 0
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* that also have an ADFS boot block at 0xdc0.
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*/
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#ifdef CONFIG_ACORN_PARTITION_ICS
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adfspart_check_ICS,
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#endif
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#ifdef CONFIG_ACORN_PARTITION_POWERTEC
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adfspart_check_POWERTEC,
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#endif
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#ifdef CONFIG_ACORN_PARTITION_EESOX
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adfspart_check_EESOX,
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#endif
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/*
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* Now move on to formats that only have partition info at
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* disk address 0xdc0. Since these may also have stale
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* PC/BIOS partition tables, they need to come before
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* the msdos entry.
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*/
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#ifdef CONFIG_ACORN_PARTITION_CUMANA
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adfspart_check_CUMANA,
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#endif
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#ifdef CONFIG_ACORN_PARTITION_ADFS
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adfspart_check_ADFS,
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#endif
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#ifdef CONFIG_CMDLINE_PARTITION
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cmdline_partition,
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#endif
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#ifdef CONFIG_EFI_PARTITION
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efi_partition, /* this must come before msdos */
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#endif
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#ifdef CONFIG_SGI_PARTITION
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sgi_partition,
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#endif
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#ifdef CONFIG_LDM_PARTITION
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ldm_partition, /* this must come before msdos */
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#endif
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#ifdef CONFIG_MSDOS_PARTITION
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msdos_partition,
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#endif
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#ifdef CONFIG_OSF_PARTITION
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osf_partition,
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#endif
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#ifdef CONFIG_SUN_PARTITION
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sun_partition,
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#endif
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#ifdef CONFIG_AMIGA_PARTITION
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amiga_partition,
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#endif
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#ifdef CONFIG_ATARI_PARTITION
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atari_partition,
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#endif
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#ifdef CONFIG_MAC_PARTITION
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mac_partition,
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#endif
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#ifdef CONFIG_ULTRIX_PARTITION
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ultrix_partition,
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#endif
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#ifdef CONFIG_IBM_PARTITION
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ibm_partition,
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#endif
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#ifdef CONFIG_KARMA_PARTITION
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karma_partition,
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#endif
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#ifdef CONFIG_SYSV68_PARTITION
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sysv68_partition,
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#endif
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NULL
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};
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static struct parsed_partitions *allocate_partitions(struct gendisk *hd)
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{
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struct parsed_partitions *state;
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int nr;
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state = kzalloc(sizeof(*state), GFP_KERNEL);
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if (!state)
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return NULL;
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nr = disk_max_parts(hd);
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state->parts = vzalloc(array_size(nr, sizeof(state->parts[0])));
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if (!state->parts) {
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kfree(state);
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return NULL;
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}
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state->limit = nr;
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return state;
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}
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static void free_partitions(struct parsed_partitions *state)
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{
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vfree(state->parts);
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kfree(state);
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}
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static struct parsed_partitions *check_partition(struct gendisk *hd,
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struct block_device *bdev)
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{
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struct parsed_partitions *state;
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int i, res, err;
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state = allocate_partitions(hd);
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if (!state)
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return NULL;
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state->pp_buf = (char *)__get_free_page(GFP_KERNEL);
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if (!state->pp_buf) {
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free_partitions(state);
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return NULL;
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}
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state->pp_buf[0] = '\0';
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state->bdev = bdev;
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disk_name(hd, 0, state->name);
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snprintf(state->pp_buf, PAGE_SIZE, " %s:", state->name);
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if (isdigit(state->name[strlen(state->name)-1]))
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sprintf(state->name, "p");
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i = res = err = 0;
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while (!res && check_part[i]) {
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memset(state->parts, 0, state->limit * sizeof(state->parts[0]));
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res = check_part[i++](state);
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if (res < 0) {
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/*
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* We have hit an I/O error which we don't report now.
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* But record it, and let the others do their job.
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*/
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err = res;
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res = 0;
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}
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}
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if (res > 0) {
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printk(KERN_INFO "%s", state->pp_buf);
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free_page((unsigned long)state->pp_buf);
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return state;
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}
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if (state->access_beyond_eod)
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err = -ENOSPC;
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/*
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* The partition is unrecognized. So report I/O errors if there were any
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*/
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if (err)
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res = err;
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if (res) {
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strlcat(state->pp_buf,
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" unable to read partition table\n", PAGE_SIZE);
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printk(KERN_INFO "%s", state->pp_buf);
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}
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free_page((unsigned long)state->pp_buf);
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free_partitions(state);
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return ERR_PTR(res);
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}
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static ssize_t part_partition_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hd_struct *p = dev_to_part(dev);
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return sprintf(buf, "%d\n", p->partno);
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}
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static ssize_t part_start_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hd_struct *p = dev_to_part(dev);
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return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
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}
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static ssize_t part_ro_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hd_struct *p = dev_to_part(dev);
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return sprintf(buf, "%d\n", p->policy ? 1 : 0);
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}
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static ssize_t part_alignment_offset_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hd_struct *p = dev_to_part(dev);
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return sprintf(buf, "%u\n",
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queue_limit_alignment_offset(&part_to_disk(p)->queue->limits,
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p->start_sect));
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}
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static ssize_t part_discard_alignment_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hd_struct *p = dev_to_part(dev);
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return sprintf(buf, "%u\n",
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queue_limit_discard_alignment(&part_to_disk(p)->queue->limits,
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p->start_sect));
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}
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static DEVICE_ATTR(partition, 0444, part_partition_show, NULL);
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static DEVICE_ATTR(start, 0444, part_start_show, NULL);
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static DEVICE_ATTR(size, 0444, part_size_show, NULL);
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static DEVICE_ATTR(ro, 0444, part_ro_show, NULL);
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static DEVICE_ATTR(alignment_offset, 0444, part_alignment_offset_show, NULL);
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static DEVICE_ATTR(discard_alignment, 0444, part_discard_alignment_show, NULL);
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static DEVICE_ATTR(stat, 0444, part_stat_show, NULL);
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static DEVICE_ATTR(inflight, 0444, part_inflight_show, NULL);
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#ifdef CONFIG_FAIL_MAKE_REQUEST
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static struct device_attribute dev_attr_fail =
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__ATTR(make-it-fail, 0644, part_fail_show, part_fail_store);
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#endif
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static struct attribute *part_attrs[] = {
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&dev_attr_partition.attr,
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&dev_attr_start.attr,
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&dev_attr_size.attr,
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&dev_attr_ro.attr,
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&dev_attr_alignment_offset.attr,
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&dev_attr_discard_alignment.attr,
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&dev_attr_stat.attr,
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&dev_attr_inflight.attr,
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#ifdef CONFIG_FAIL_MAKE_REQUEST
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&dev_attr_fail.attr,
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#endif
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NULL
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};
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static struct attribute_group part_attr_group = {
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.attrs = part_attrs,
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};
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static const struct attribute_group *part_attr_groups[] = {
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&part_attr_group,
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#ifdef CONFIG_BLK_DEV_IO_TRACE
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&blk_trace_attr_group,
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#endif
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NULL
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};
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static void part_release(struct device *dev)
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{
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struct hd_struct *p = dev_to_part(dev);
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blk_free_devt(dev->devt);
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hd_free_part(p);
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kfree(p);
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}
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static int part_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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struct hd_struct *part = dev_to_part(dev);
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add_uevent_var(env, "PARTN=%u", part->partno);
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if (part->info && part->info->volname[0])
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add_uevent_var(env, "PARTNAME=%s", part->info->volname);
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return 0;
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}
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struct device_type part_type = {
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.name = "partition",
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.groups = part_attr_groups,
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.release = part_release,
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.uevent = part_uevent,
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};
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static void hd_struct_free_work(struct work_struct *work)
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{
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struct hd_struct *part =
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container_of(to_rcu_work(work), struct hd_struct, rcu_work);
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struct gendisk *disk = part_to_disk(part);
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/*
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* Release the disk reference acquired in delete_partition here.
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* We can't release it in hd_struct_free because the final put_device
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* needs process context and thus can't be run directly from a
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* percpu_ref ->release handler.
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*/
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put_device(disk_to_dev(disk));
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part->start_sect = 0;
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part->nr_sects = 0;
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part_stat_set_all(part, 0);
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put_device(part_to_dev(part));
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}
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static void hd_struct_free(struct percpu_ref *ref)
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{
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struct hd_struct *part = container_of(ref, struct hd_struct, ref);
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struct gendisk *disk = part_to_disk(part);
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struct disk_part_tbl *ptbl =
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rcu_dereference_protected(disk->part_tbl, 1);
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rcu_assign_pointer(ptbl->last_lookup, NULL);
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INIT_RCU_WORK(&part->rcu_work, hd_struct_free_work);
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queue_rcu_work(system_wq, &part->rcu_work);
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}
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int hd_ref_init(struct hd_struct *part)
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{
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if (percpu_ref_init(&part->ref, hd_struct_free, 0, GFP_KERNEL))
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return -ENOMEM;
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return 0;
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}
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/*
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* Must be called either with bd_mutex held, before a disk can be opened or
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* after all disk users are gone.
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*/
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void delete_partition(struct hd_struct *part)
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{
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struct gendisk *disk = part_to_disk(part);
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struct disk_part_tbl *ptbl =
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rcu_dereference_protected(disk->part_tbl, 1);
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/*
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* ->part_tbl is referenced in this part's release handler, so
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* we have to hold the disk device
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*/
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get_device(disk_to_dev(disk));
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rcu_assign_pointer(ptbl->part[part->partno], NULL);
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kobject_put(part->holder_dir);
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device_del(part_to_dev(part));
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/*
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* Remove gendisk pointer from idr so that it cannot be looked up
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* while RCU period before freeing gendisk is running to prevent
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* use-after-free issues. Note that the device number stays
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* "in-use" until we really free the gendisk.
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*/
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blk_invalidate_devt(part_devt(part));
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percpu_ref_kill(&part->ref);
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}
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static ssize_t whole_disk_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return 0;
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}
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static DEVICE_ATTR(whole_disk, 0444, whole_disk_show, NULL);
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/*
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* Must be called either with bd_mutex held, before a disk can be opened or
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* after all disk users are gone.
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*/
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static struct hd_struct *add_partition(struct gendisk *disk, int partno,
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sector_t start, sector_t len, int flags,
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struct partition_meta_info *info)
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{
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struct hd_struct *p;
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dev_t devt = MKDEV(0, 0);
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struct device *ddev = disk_to_dev(disk);
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struct device *pdev;
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struct disk_part_tbl *ptbl;
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const char *dname;
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int err;
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/*
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* Partitions are not supported on zoned block devices that are used as
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* such.
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*/
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switch (disk->queue->limits.zoned) {
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case BLK_ZONED_HM:
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pr_warn("%s: partitions not supported on host managed zoned block device\n",
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disk->disk_name);
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return ERR_PTR(-ENXIO);
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case BLK_ZONED_HA:
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pr_info("%s: disabling host aware zoned block device support due to partitions\n",
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disk->disk_name);
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disk->queue->limits.zoned = BLK_ZONED_NONE;
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break;
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case BLK_ZONED_NONE:
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break;
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}
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err = disk_expand_part_tbl(disk, partno);
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if (err)
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return ERR_PTR(err);
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ptbl = rcu_dereference_protected(disk->part_tbl, 1);
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if (ptbl->part[partno])
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return ERR_PTR(-EBUSY);
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p = kzalloc(sizeof(*p), GFP_KERNEL);
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if (!p)
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return ERR_PTR(-EBUSY);
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p->dkstats = alloc_percpu(struct disk_stats);
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if (!p->dkstats) {
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err = -ENOMEM;
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goto out_free;
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}
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hd_sects_seq_init(p);
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pdev = part_to_dev(p);
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p->start_sect = start;
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p->nr_sects = len;
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p->partno = partno;
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p->policy = get_disk_ro(disk);
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if (info) {
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struct partition_meta_info *pinfo;
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pinfo = kzalloc_node(sizeof(*pinfo), GFP_KERNEL, disk->node_id);
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if (!pinfo) {
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err = -ENOMEM;
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goto out_free_stats;
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}
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memcpy(pinfo, info, sizeof(*info));
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p->info = pinfo;
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}
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dname = dev_name(ddev);
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if (isdigit(dname[strlen(dname) - 1]))
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dev_set_name(pdev, "%sp%d", dname, partno);
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else
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dev_set_name(pdev, "%s%d", dname, partno);
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device_initialize(pdev);
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pdev->class = &block_class;
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pdev->type = &part_type;
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pdev->parent = ddev;
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err = blk_alloc_devt(p, &devt);
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if (err)
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goto out_free_info;
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pdev->devt = devt;
|
|
|
|
/* delay uevent until 'holders' subdir is created */
|
|
dev_set_uevent_suppress(pdev, 1);
|
|
err = device_add(pdev);
|
|
if (err)
|
|
goto out_put;
|
|
|
|
err = -ENOMEM;
|
|
p->holder_dir = kobject_create_and_add("holders", &pdev->kobj);
|
|
if (!p->holder_dir)
|
|
goto out_del;
|
|
|
|
dev_set_uevent_suppress(pdev, 0);
|
|
if (flags & ADDPART_FLAG_WHOLEDISK) {
|
|
err = device_create_file(pdev, &dev_attr_whole_disk);
|
|
if (err)
|
|
goto out_del;
|
|
}
|
|
|
|
err = hd_ref_init(p);
|
|
if (err) {
|
|
if (flags & ADDPART_FLAG_WHOLEDISK)
|
|
goto out_remove_file;
|
|
goto out_del;
|
|
}
|
|
|
|
/* everything is up and running, commence */
|
|
rcu_assign_pointer(ptbl->part[partno], p);
|
|
|
|
/* suppress uevent if the disk suppresses it */
|
|
if (!dev_get_uevent_suppress(ddev))
|
|
kobject_uevent(&pdev->kobj, KOBJ_ADD);
|
|
return p;
|
|
|
|
out_free_info:
|
|
kfree(p->info);
|
|
out_free_stats:
|
|
free_percpu(p->dkstats);
|
|
out_free:
|
|
kfree(p);
|
|
return ERR_PTR(err);
|
|
out_remove_file:
|
|
device_remove_file(pdev, &dev_attr_whole_disk);
|
|
out_del:
|
|
kobject_put(p->holder_dir);
|
|
device_del(pdev);
|
|
out_put:
|
|
put_device(pdev);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static bool partition_overlaps(struct gendisk *disk, sector_t start,
|
|
sector_t length, int skip_partno)
|
|
{
|
|
struct disk_part_iter piter;
|
|
struct hd_struct *part;
|
|
bool overlap = false;
|
|
|
|
disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
|
|
while ((part = disk_part_iter_next(&piter))) {
|
|
if (part->partno == skip_partno ||
|
|
start >= part->start_sect + part->nr_sects ||
|
|
start + length <= part->start_sect)
|
|
continue;
|
|
overlap = true;
|
|
break;
|
|
}
|
|
|
|
disk_part_iter_exit(&piter);
|
|
return overlap;
|
|
}
|
|
|
|
int bdev_add_partition(struct block_device *bdev, int partno,
|
|
sector_t start, sector_t length)
|
|
{
|
|
struct hd_struct *part;
|
|
|
|
mutex_lock(&bdev->bd_mutex);
|
|
if (partition_overlaps(bdev->bd_disk, start, length, -1)) {
|
|
mutex_unlock(&bdev->bd_mutex);
|
|
return -EBUSY;
|
|
}
|
|
|
|
part = add_partition(bdev->bd_disk, partno, start, length,
|
|
ADDPART_FLAG_NONE, NULL);
|
|
mutex_unlock(&bdev->bd_mutex);
|
|
return PTR_ERR_OR_ZERO(part);
|
|
}
|
|
|
|
int bdev_del_partition(struct block_device *bdev, int partno)
|
|
{
|
|
struct block_device *bdevp;
|
|
struct hd_struct *part = NULL;
|
|
int ret;
|
|
|
|
bdevp = bdget_disk(bdev->bd_disk, partno);
|
|
if (!bdevp)
|
|
return -ENXIO;
|
|
|
|
mutex_lock(&bdevp->bd_mutex);
|
|
mutex_lock_nested(&bdev->bd_mutex, 1);
|
|
|
|
ret = -ENXIO;
|
|
part = disk_get_part(bdev->bd_disk, partno);
|
|
if (!part)
|
|
goto out_unlock;
|
|
|
|
ret = -EBUSY;
|
|
if (bdevp->bd_openers)
|
|
goto out_unlock;
|
|
|
|
sync_blockdev(bdevp);
|
|
invalidate_bdev(bdevp);
|
|
|
|
delete_partition(part);
|
|
ret = 0;
|
|
out_unlock:
|
|
mutex_unlock(&bdev->bd_mutex);
|
|
mutex_unlock(&bdevp->bd_mutex);
|
|
bdput(bdevp);
|
|
if (part)
|
|
disk_put_part(part);
|
|
return ret;
|
|
}
|
|
|
|
int bdev_resize_partition(struct block_device *bdev, int partno,
|
|
sector_t start, sector_t length)
|
|
{
|
|
struct block_device *bdevp;
|
|
struct hd_struct *part;
|
|
int ret = 0;
|
|
|
|
part = disk_get_part(bdev->bd_disk, partno);
|
|
if (!part)
|
|
return -ENXIO;
|
|
|
|
ret = -ENOMEM;
|
|
bdevp = bdget_part(part);
|
|
if (!bdevp)
|
|
goto out_put_part;
|
|
|
|
mutex_lock(&bdevp->bd_mutex);
|
|
mutex_lock_nested(&bdev->bd_mutex, 1);
|
|
|
|
ret = -EINVAL;
|
|
if (start != part->start_sect)
|
|
goto out_unlock;
|
|
|
|
ret = -EBUSY;
|
|
if (partition_overlaps(bdev->bd_disk, start, length, partno))
|
|
goto out_unlock;
|
|
|
|
part_nr_sects_write(part, length);
|
|
bd_set_nr_sectors(bdevp, length);
|
|
|
|
ret = 0;
|
|
out_unlock:
|
|
mutex_unlock(&bdevp->bd_mutex);
|
|
mutex_unlock(&bdev->bd_mutex);
|
|
bdput(bdevp);
|
|
out_put_part:
|
|
disk_put_part(part);
|
|
return ret;
|
|
}
|
|
|
|
static bool disk_unlock_native_capacity(struct gendisk *disk)
|
|
{
|
|
const struct block_device_operations *bdops = disk->fops;
|
|
|
|
if (bdops->unlock_native_capacity &&
|
|
!(disk->flags & GENHD_FL_NATIVE_CAPACITY)) {
|
|
printk(KERN_CONT "enabling native capacity\n");
|
|
bdops->unlock_native_capacity(disk);
|
|
disk->flags |= GENHD_FL_NATIVE_CAPACITY;
|
|
return true;
|
|
} else {
|
|
printk(KERN_CONT "truncated\n");
|
|
return false;
|
|
}
|
|
}
|
|
|
|
int blk_drop_partitions(struct block_device *bdev)
|
|
{
|
|
struct disk_part_iter piter;
|
|
struct hd_struct *part;
|
|
|
|
if (bdev->bd_part_count)
|
|
return -EBUSY;
|
|
|
|
sync_blockdev(bdev);
|
|
invalidate_bdev(bdev);
|
|
|
|
disk_part_iter_init(&piter, bdev->bd_disk, DISK_PITER_INCL_EMPTY);
|
|
while ((part = disk_part_iter_next(&piter)))
|
|
delete_partition(part);
|
|
disk_part_iter_exit(&piter);
|
|
|
|
return 0;
|
|
}
|
|
#ifdef CONFIG_S390
|
|
/* for historic reasons in the DASD driver */
|
|
EXPORT_SYMBOL_GPL(blk_drop_partitions);
|
|
#endif
|
|
|
|
static bool blk_add_partition(struct gendisk *disk, struct block_device *bdev,
|
|
struct parsed_partitions *state, int p)
|
|
{
|
|
sector_t size = state->parts[p].size;
|
|
sector_t from = state->parts[p].from;
|
|
struct hd_struct *part;
|
|
|
|
if (!size)
|
|
return true;
|
|
|
|
if (from >= get_capacity(disk)) {
|
|
printk(KERN_WARNING
|
|
"%s: p%d start %llu is beyond EOD, ",
|
|
disk->disk_name, p, (unsigned long long) from);
|
|
if (disk_unlock_native_capacity(disk))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
if (from + size > get_capacity(disk)) {
|
|
printk(KERN_WARNING
|
|
"%s: p%d size %llu extends beyond EOD, ",
|
|
disk->disk_name, p, (unsigned long long) size);
|
|
|
|
if (disk_unlock_native_capacity(disk))
|
|
return false;
|
|
|
|
/*
|
|
* We can not ignore partitions of broken tables created by for
|
|
* example camera firmware, but we limit them to the end of the
|
|
* disk to avoid creating invalid block devices.
|
|
*/
|
|
size = get_capacity(disk) - from;
|
|
}
|
|
|
|
part = add_partition(disk, p, from, size, state->parts[p].flags,
|
|
&state->parts[p].info);
|
|
if (IS_ERR(part) && PTR_ERR(part) != -ENXIO) {
|
|
printk(KERN_ERR " %s: p%d could not be added: %ld\n",
|
|
disk->disk_name, p, -PTR_ERR(part));
|
|
return true;
|
|
}
|
|
|
|
if (IS_BUILTIN(CONFIG_BLK_DEV_MD) &&
|
|
(state->parts[p].flags & ADDPART_FLAG_RAID))
|
|
md_autodetect_dev(part_to_dev(part)->devt);
|
|
|
|
return true;
|
|
}
|
|
|
|
int blk_add_partitions(struct gendisk *disk, struct block_device *bdev)
|
|
{
|
|
struct parsed_partitions *state;
|
|
int ret = -EAGAIN, p, highest;
|
|
|
|
if (!disk_part_scan_enabled(disk))
|
|
return 0;
|
|
|
|
state = check_partition(disk, bdev);
|
|
if (!state)
|
|
return 0;
|
|
if (IS_ERR(state)) {
|
|
/*
|
|
* I/O error reading the partition table. If we tried to read
|
|
* beyond EOD, retry after unlocking the native capacity.
|
|
*/
|
|
if (PTR_ERR(state) == -ENOSPC) {
|
|
printk(KERN_WARNING "%s: partition table beyond EOD, ",
|
|
disk->disk_name);
|
|
if (disk_unlock_native_capacity(disk))
|
|
return -EAGAIN;
|
|
}
|
|
return -EIO;
|
|
}
|
|
|
|
/*
|
|
* Partitions are not supported on host managed zoned block devices.
|
|
*/
|
|
if (disk->queue->limits.zoned == BLK_ZONED_HM) {
|
|
pr_warn("%s: ignoring partition table on host managed zoned block device\n",
|
|
disk->disk_name);
|
|
ret = 0;
|
|
goto out_free_state;
|
|
}
|
|
|
|
/*
|
|
* If we read beyond EOD, try unlocking native capacity even if the
|
|
* partition table was successfully read as we could be missing some
|
|
* partitions.
|
|
*/
|
|
if (state->access_beyond_eod) {
|
|
printk(KERN_WARNING
|
|
"%s: partition table partially beyond EOD, ",
|
|
disk->disk_name);
|
|
if (disk_unlock_native_capacity(disk))
|
|
goto out_free_state;
|
|
}
|
|
|
|
/* tell userspace that the media / partition table may have changed */
|
|
kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
|
|
|
|
/*
|
|
* Detect the highest partition number and preallocate disk->part_tbl.
|
|
* This is an optimization and not strictly necessary.
|
|
*/
|
|
for (p = 1, highest = 0; p < state->limit; p++)
|
|
if (state->parts[p].size)
|
|
highest = p;
|
|
disk_expand_part_tbl(disk, highest);
|
|
|
|
for (p = 1; p < state->limit; p++)
|
|
if (!blk_add_partition(disk, bdev, state, p))
|
|
goto out_free_state;
|
|
|
|
ret = 0;
|
|
out_free_state:
|
|
free_partitions(state);
|
|
return ret;
|
|
}
|
|
|
|
void *read_part_sector(struct parsed_partitions *state, sector_t n, Sector *p)
|
|
{
|
|
struct address_space *mapping = state->bdev->bd_inode->i_mapping;
|
|
struct page *page;
|
|
|
|
if (n >= get_capacity(state->bdev->bd_disk)) {
|
|
state->access_beyond_eod = true;
|
|
return NULL;
|
|
}
|
|
|
|
page = read_mapping_page(mapping,
|
|
(pgoff_t)(n >> (PAGE_SHIFT - 9)), NULL);
|
|
if (IS_ERR(page))
|
|
goto out;
|
|
if (PageError(page))
|
|
goto out_put_page;
|
|
|
|
p->v = page;
|
|
return (unsigned char *)page_address(page) +
|
|
((n & ((1 << (PAGE_SHIFT - 9)) - 1)) << SECTOR_SHIFT);
|
|
out_put_page:
|
|
put_page(page);
|
|
out:
|
|
p->v = NULL;
|
|
return NULL;
|
|
}
|