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![Christoph Hellwig](/assets/img/avatar_default.png)
There is no need to hold a bdev reference when removing the partition. Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20210701081638.246552-3-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
741 lines
17 KiB
C
741 lines
17 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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* Copyright (C) 2020 Christoph Hellwig
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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 void bdev_set_nr_sectors(struct block_device *bdev, sector_t sectors)
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{
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spin_lock(&bdev->bd_size_lock);
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i_size_write(bdev->bd_inode, (loff_t)sectors << SECTOR_SHIFT);
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spin_unlock(&bdev->bd_size_lock);
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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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{
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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 = hd->part0;
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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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return sprintf(buf, "%d\n", dev_to_bdev(dev)->bd_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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return sprintf(buf, "%llu\n", dev_to_bdev(dev)->bd_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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return sprintf(buf, "%d\n", bdev_read_only(dev_to_bdev(dev)));
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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 block_device *bdev = dev_to_bdev(dev);
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return sprintf(buf, "%u\n",
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queue_limit_alignment_offset(&bdev->bd_disk->queue->limits,
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bdev->bd_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 block_device *bdev = dev_to_bdev(dev);
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return sprintf(buf, "%u\n",
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queue_limit_discard_alignment(&bdev->bd_disk->queue->limits,
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bdev->bd_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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if (MAJOR(dev->devt) == BLOCK_EXT_MAJOR)
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blk_free_ext_minor(MINOR(dev->devt));
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bdput(dev_to_bdev(dev));
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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 block_device *part = dev_to_bdev(dev);
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add_uevent_var(env, "PARTN=%u", part->bd_partno);
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if (part->bd_meta_info && part->bd_meta_info->volname[0])
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add_uevent_var(env, "PARTNAME=%s", part->bd_meta_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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/*
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* Must be called either with open_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 void delete_partition(struct block_device *part)
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{
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fsync_bdev(part);
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__invalidate_device(part, true);
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xa_erase(&part->bd_disk->part_tbl, part->bd_partno);
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kobject_put(part->bd_holder_dir);
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device_del(&part->bd_device);
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/*
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* Remove the block device from the inode hash, so that it cannot be
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* looked up any more even when openers still hold references.
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*/
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remove_inode_hash(part->bd_inode);
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put_device(&part->bd_device);
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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 open_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 block_device *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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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 block_device *bdev;
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const char *dname;
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int err;
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lockdep_assert_held(&disk->open_mutex);
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if (partno >= disk_max_parts(disk))
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return ERR_PTR(-EINVAL);
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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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blk_queue_set_zoned(disk, 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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if (xa_load(&disk->part_tbl, partno))
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return ERR_PTR(-EBUSY);
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bdev = bdev_alloc(disk, partno);
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if (!bdev)
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return ERR_PTR(-ENOMEM);
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bdev->bd_start_sect = start;
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bdev_set_nr_sectors(bdev, len);
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if (info) {
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err = -ENOMEM;
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bdev->bd_meta_info = kmemdup(info, sizeof(*info), GFP_KERNEL);
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if (!bdev->bd_meta_info)
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goto out_bdput;
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}
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pdev = &bdev->bd_device;
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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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/* in consecutive minor range? */
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if (bdev->bd_partno < disk->minors) {
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devt = MKDEV(disk->major, disk->first_minor + bdev->bd_partno);
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} else {
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err = blk_alloc_ext_minor();
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if (err < 0)
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goto out_put;
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devt = MKDEV(BLOCK_EXT_MAJOR, err);
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}
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pdev->devt = devt;
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/* delay uevent until 'holders' subdir is created */
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dev_set_uevent_suppress(pdev, 1);
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err = device_add(pdev);
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if (err)
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goto out_put;
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err = -ENOMEM;
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bdev->bd_holder_dir = kobject_create_and_add("holders", &pdev->kobj);
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if (!bdev->bd_holder_dir)
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goto out_del;
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dev_set_uevent_suppress(pdev, 0);
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if (flags & ADDPART_FLAG_WHOLEDISK) {
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err = device_create_file(pdev, &dev_attr_whole_disk);
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if (err)
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goto out_del;
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}
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|
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/* everything is up and running, commence */
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err = xa_insert(&disk->part_tbl, partno, bdev, GFP_KERNEL);
|
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if (err)
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goto out_del;
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bdev_add(bdev, devt);
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|
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/* suppress uevent if the disk suppresses it */
|
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if (!dev_get_uevent_suppress(ddev))
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kobject_uevent(&pdev->kobj, KOBJ_ADD);
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return bdev;
|
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|
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out_bdput:
|
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bdput(bdev);
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return ERR_PTR(err);
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out_del:
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kobject_put(bdev->bd_holder_dir);
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device_del(pdev);
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|
out_put:
|
|
put_device(pdev);
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return ERR_PTR(err);
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}
|
|
|
|
static bool partition_overlaps(struct gendisk *disk, sector_t start,
|
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sector_t length, int skip_partno)
|
|
{
|
|
struct block_device *part;
|
|
bool overlap = false;
|
|
unsigned long idx;
|
|
|
|
rcu_read_lock();
|
|
xa_for_each_start(&disk->part_tbl, idx, part, 1) {
|
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if (part->bd_partno != skip_partno &&
|
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start < part->bd_start_sect + bdev_nr_sectors(part) &&
|
|
start + length > part->bd_start_sect) {
|
|
overlap = true;
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break;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return overlap;
|
|
}
|
|
|
|
int bdev_add_partition(struct block_device *bdev, int partno,
|
|
sector_t start, sector_t length)
|
|
{
|
|
struct block_device *part;
|
|
struct gendisk *disk = bdev->bd_disk;
|
|
int ret;
|
|
|
|
mutex_lock(&disk->open_mutex);
|
|
if (!(disk->flags & GENHD_FL_UP)) {
|
|
ret = -ENXIO;
|
|
goto out;
|
|
}
|
|
|
|
if (partition_overlaps(disk, start, length, -1)) {
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
part = add_partition(disk, partno, start, length,
|
|
ADDPART_FLAG_NONE, NULL);
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|
ret = PTR_ERR_OR_ZERO(part);
|
|
out:
|
|
mutex_unlock(&disk->open_mutex);
|
|
return ret;
|
|
}
|
|
|
|
int bdev_del_partition(struct block_device *bdev, int partno)
|
|
{
|
|
struct block_device *part = NULL;
|
|
int ret = -ENXIO;
|
|
|
|
mutex_lock(&bdev->bd_disk->open_mutex);
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|
part = xa_load(&bdev->bd_disk->part_tbl, partno);
|
|
if (!part)
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|
goto out_unlock;
|
|
|
|
ret = -EBUSY;
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|
if (part->bd_openers)
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|
goto out_unlock;
|
|
|
|
delete_partition(part);
|
|
ret = 0;
|
|
out_unlock:
|
|
mutex_unlock(&bdev->bd_disk->open_mutex);
|
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return ret;
|
|
}
|
|
|
|
int bdev_resize_partition(struct block_device *bdev, int partno,
|
|
sector_t start, sector_t length)
|
|
{
|
|
struct block_device *part = NULL;
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|
int ret = -ENXIO;
|
|
|
|
mutex_lock(&bdev->bd_disk->open_mutex);
|
|
part = xa_load(&bdev->bd_disk->part_tbl, partno);
|
|
if (!part)
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|
goto out_unlock;
|
|
|
|
ret = -EINVAL;
|
|
if (start != part->bd_start_sect)
|
|
goto out_unlock;
|
|
|
|
ret = -EBUSY;
|
|
if (partition_overlaps(bdev->bd_disk, start, length, partno))
|
|
goto out_unlock;
|
|
|
|
bdev_set_nr_sectors(part, length);
|
|
|
|
ret = 0;
|
|
out_unlock:
|
|
mutex_unlock(&bdev->bd_disk->open_mutex);
|
|
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;
|
|
}
|
|
}
|
|
|
|
void blk_drop_partitions(struct gendisk *disk)
|
|
{
|
|
struct block_device *part;
|
|
unsigned long idx;
|
|
|
|
lockdep_assert_held(&disk->open_mutex);
|
|
|
|
xa_for_each_start(&disk->part_tbl, idx, part, 1)
|
|
delete_partition(part);
|
|
}
|
|
|
|
static bool blk_add_partition(struct gendisk *disk,
|
|
struct parsed_partitions *state, int p)
|
|
{
|
|
sector_t size = state->parts[p].size;
|
|
sector_t from = state->parts[p].from;
|
|
struct block_device *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->bd_dev);
|
|
|
|
return true;
|
|
}
|
|
|
|
static int blk_add_partitions(struct gendisk *disk)
|
|
{
|
|
struct parsed_partitions *state;
|
|
int ret = -EAGAIN, p;
|
|
|
|
if (!disk_part_scan_enabled(disk))
|
|
return 0;
|
|
|
|
state = check_partition(disk);
|
|
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);
|
|
|
|
for (p = 1; p < state->limit; p++)
|
|
if (!blk_add_partition(disk, state, p))
|
|
goto out_free_state;
|
|
|
|
ret = 0;
|
|
out_free_state:
|
|
free_partitions(state);
|
|
return ret;
|
|
}
|
|
|
|
int bdev_disk_changed(struct gendisk *disk, bool invalidate)
|
|
{
|
|
int ret = 0;
|
|
|
|
lockdep_assert_held(&disk->open_mutex);
|
|
|
|
if (!(disk->flags & GENHD_FL_UP))
|
|
return -ENXIO;
|
|
|
|
rescan:
|
|
if (disk->open_partitions)
|
|
return -EBUSY;
|
|
sync_blockdev(disk->part0);
|
|
invalidate_bdev(disk->part0);
|
|
blk_drop_partitions(disk);
|
|
|
|
clear_bit(GD_NEED_PART_SCAN, &disk->state);
|
|
|
|
/*
|
|
* Historically we only set the capacity to zero for devices that
|
|
* support partitions (independ of actually having partitions created).
|
|
* Doing that is rather inconsistent, but changing it broke legacy
|
|
* udisks polling for legacy ide-cdrom devices. Use the crude check
|
|
* below to get the sane behavior for most device while not breaking
|
|
* userspace for this particular setup.
|
|
*/
|
|
if (invalidate) {
|
|
if (disk_part_scan_enabled(disk) ||
|
|
!(disk->flags & GENHD_FL_REMOVABLE))
|
|
set_capacity(disk, 0);
|
|
}
|
|
|
|
if (get_capacity(disk)) {
|
|
ret = blk_add_partitions(disk);
|
|
if (ret == -EAGAIN)
|
|
goto rescan;
|
|
} else if (invalidate) {
|
|
/*
|
|
* Tell userspace that the media / partition table may have
|
|
* changed.
|
|
*/
|
|
kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
/*
|
|
* Only exported for loop and dasd for historic reasons. Don't use in new
|
|
* code!
|
|
*/
|
|
EXPORT_SYMBOL_GPL(bdev_disk_changed);
|
|
|
|
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;
|
|
}
|