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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
* Region media error reporting: A libnvdimm region device is the parent to one or more namespaces. To date, media errors have been reported via the "badblocks" attribute attached to pmem block devices for namespaces in "raw" or "memory" mode. Given that namespaces can be in "device-dax" or "btt-sector" mode this new interface reports media errors generically, i.e. independent of namespace modes or state. This subsequently allows userspace tooling to craft "ACPI 6.1 Section 9.20.7.6 Function Index 4 - Clear Uncorrectable Error" requests and submit them via the ioctl path for NVDIMM root bus devices. * Introduce 'struct dax_device' and 'struct dax_operations': Prompted by a request from Linus and feedback from Christoph this allows for dax capable drivers to publish their own custom dax operations. This fixes the broken assumption that all dax operations are related to a persistent memory device, and makes it easier for other architectures and platforms to add customized persistent memory support. * 'libnvdimm' core updates: A new "deep_flush" sysfs attribute is available for storage appliance applications to manually trigger memory controllers to drain write-pending buffers that would otherwise be flushed automatically by the platform ADR (asynchronous-DRAM-refresh) mechanism at a power loss event. Support for "locked" DIMMs is included to prevent namespaces from surfacing when the namespace label data area is locked. Finally, fixes for various reported deadlocks and crashes, also tagged for -stable. * ACPI / nfit driver updates: General updates of the nfit driver to add DSM command overrides, ACPI 6.1 health state flags support, DSM payload debug available by default, and various fixes. Acknowledgements that came after the branch was pushed: commmit565851c972
"device-dax: fix sysfs attribute deadlock" Tested-by: Yi Zhang <yizhan@redhat.com> commit23f4984483
"libnvdimm: rework region badblocks clearing" Tested-by: Toshi Kani <toshi.kani@hpe.com> -----BEGIN PGP SIGNATURE----- iQIcBAABAgAGBQJZDONJAAoJEB7SkWpmfYgC3SsP/2KrLvTUcz646ViuPOgZ2cC4 W6wAx6cvDSt+H52kLnFEsYoFt7WAj20ggPirb/Bc5jkGlvwE0lT9Xtmso9GpVkYT J9ZJ9pP/4YaAD3II1gmTwaUjYi0FxoOdx3Eb92yuWkO/8ylz4b2Nu3cBpYwyziGQ nIfEVwDXRLE86u6x0bWuf6TlVuvsbdiAI55CDqDMVQC6xIOLbSez7b8QIHlpiKEb Mw+xqdQva0esoreZEOXEhWNO+qtfILx8/ceBEGTNMp4e/JjZ2FbrSNplM+9bH5k7 ywqP8lW+mBEw0fmBBkYoVG/xyesiiBb55JLnbi8Ew+7IUxw8a3iV7wftRi62lHcK zAjsHe4L+MansgtZsCL8wluvIPaktAdtB4xr7l9VNLKRYRUG73jEWU0gcUNryHIL BkQJ52pUS1PkClyAsWbBBHl1I/CvzVPd21VW0YELmLR4OywKy1c+eKw2bcYgjrb4 59HZSv6S6EoKaQC+2qvVNpePil7cdfg5V2ubH/ki9HoYVyoxDptEWHnvf0NNatIH Y7mNcOPvhOksJmnKSyHbDjtRur7WoHIlC9D7UjEFkSBWsKPjxJHoidN4SnCMRtjQ WKQU0seoaKj04b68Bs/Qm9NozVgnsPFIUDZeLMikLFX2Jt7YSPu+Jmi2s4re6WLh TmJQ3Ly9t3o3/weHSzmn =Ox0s -----END PGP SIGNATURE----- Merge tag 'libnvdimm-for-4.12' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm Pull libnvdimm updates from Dan Williams: "The bulk of this has been in multiple -next releases. There were a few late breaking fixes and small features that got added in the last couple days, but the whole set has received a build success notification from the kbuild robot. Change summary: - Region media error reporting: A libnvdimm region device is the parent to one or more namespaces. To date, media errors have been reported via the "badblocks" attribute attached to pmem block devices for namespaces in "raw" or "memory" mode. Given that namespaces can be in "device-dax" or "btt-sector" mode this new interface reports media errors generically, i.e. independent of namespace modes or state. This subsequently allows userspace tooling to craft "ACPI 6.1 Section 9.20.7.6 Function Index 4 - Clear Uncorrectable Error" requests and submit them via the ioctl path for NVDIMM root bus devices. - Introduce 'struct dax_device' and 'struct dax_operations': Prompted by a request from Linus and feedback from Christoph this allows for dax capable drivers to publish their own custom dax operations. This fixes the broken assumption that all dax operations are related to a persistent memory device, and makes it easier for other architectures and platforms to add customized persistent memory support. - 'libnvdimm' core updates: A new "deep_flush" sysfs attribute is available for storage appliance applications to manually trigger memory controllers to drain write-pending buffers that would otherwise be flushed automatically by the platform ADR (asynchronous-DRAM-refresh) mechanism at a power loss event. Support for "locked" DIMMs is included to prevent namespaces from surfacing when the namespace label data area is locked. Finally, fixes for various reported deadlocks and crashes, also tagged for -stable. - ACPI / nfit driver updates: General updates of the nfit driver to add DSM command overrides, ACPI 6.1 health state flags support, DSM payload debug available by default, and various fixes. Acknowledgements that came after the branch was pushed: - commmit565851c972
"device-dax: fix sysfs attribute deadlock": Tested-by: Yi Zhang <yizhan@redhat.com> - commit23f4984483
"libnvdimm: rework region badblocks clearing" Tested-by: Toshi Kani <toshi.kani@hpe.com>" * tag 'libnvdimm-for-4.12' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: (52 commits) libnvdimm, pfn: fix 'npfns' vs section alignment libnvdimm: handle locked label storage areas libnvdimm: convert NDD_ flags to use bitops, introduce NDD_LOCKED brd: fix uninitialized use of brd->dax_dev block, dax: use correct format string in bdev_dax_supported device-dax: fix sysfs attribute deadlock libnvdimm: restore "libnvdimm: band aid btt vs clear poison locking" libnvdimm: fix nvdimm_bus_lock() vs device_lock() ordering libnvdimm: rework region badblocks clearing acpi, nfit: kill ACPI_NFIT_DEBUG libnvdimm: fix clear length of nvdimm_forget_poison() libnvdimm, pmem: fix a NULL pointer BUG in nd_pmem_notify libnvdimm, region: sysfs trigger for nvdimm_flush() libnvdimm: fix phys_addr for nvdimm_clear_poison x86, dax, pmem: remove indirection around memcpy_from_pmem() block: remove block_device_operations ->direct_access() block, dax: convert bdev_dax_supported() to dax_direct_access() filesystem-dax: convert to dax_direct_access() Revert "block: use DAX for partition table reads" ext2, ext4, xfs: retrieve dax_device for iomap operations ...
650 lines
16 KiB
C
650 lines
16 KiB
C
/*
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* Code extracted from drivers/block/genhd.c
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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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* We now have independent partition support from the
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* block drivers, which allows all the partition code to
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* be grouped in one location, and it to be mostly self
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* contained.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/kmod.h>
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#include <linux/ctype.h>
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#include <linux/genhd.h>
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#include <linux/blktrace_api.h>
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#include "partitions/check.h"
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#ifdef CONFIG_BLK_DEV_MD
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extern void md_autodetect_dev(dev_t dev);
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#endif
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/*
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* disk_name() is used by partition check code and the genhd driver.
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* It formats the devicename of the indicated disk into
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* the supplied buffer (of size at least 32), and returns
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* a pointer to that same buffer (for convenience).
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*/
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char *disk_name(struct gendisk *hd, int partno, char *buf)
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{
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if (!partno)
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snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);
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else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))
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snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno);
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else
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snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno);
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return buf;
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}
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const char *bdevname(struct block_device *bdev, char *buf)
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{
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return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf);
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}
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EXPORT_SYMBOL(bdevname);
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/*
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* There's very little reason to use this, you should really
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* have a struct block_device just about everywhere and use
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* bdevname() instead.
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*/
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const char *__bdevname(dev_t dev, char *buffer)
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{
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scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
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MAJOR(dev), MINOR(dev));
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return buffer;
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}
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EXPORT_SYMBOL(__bdevname);
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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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ssize_t part_size_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)part_nr_sects_read(p));
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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, "%llu\n", (unsigned long long)p->alignment_offset);
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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", p->discard_alignment);
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}
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ssize_t part_stat_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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int cpu;
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cpu = part_stat_lock();
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part_round_stats(cpu, p);
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part_stat_unlock();
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return sprintf(buf,
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"%8lu %8lu %8llu %8u "
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"%8lu %8lu %8llu %8u "
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"%8u %8u %8u"
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"\n",
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part_stat_read(p, ios[READ]),
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part_stat_read(p, merges[READ]),
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(unsigned long long)part_stat_read(p, sectors[READ]),
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jiffies_to_msecs(part_stat_read(p, ticks[READ])),
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part_stat_read(p, ios[WRITE]),
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part_stat_read(p, merges[WRITE]),
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(unsigned long long)part_stat_read(p, sectors[WRITE]),
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jiffies_to_msecs(part_stat_read(p, ticks[WRITE])),
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part_in_flight(p),
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jiffies_to_msecs(part_stat_read(p, io_ticks)),
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jiffies_to_msecs(part_stat_read(p, time_in_queue)));
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}
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ssize_t part_inflight_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, "%8u %8u\n", atomic_read(&p->in_flight[0]),
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atomic_read(&p->in_flight[1]));
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}
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#ifdef CONFIG_FAIL_MAKE_REQUEST
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ssize_t part_fail_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->make_it_fail);
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}
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ssize_t part_fail_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct hd_struct *p = dev_to_part(dev);
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int i;
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if (count > 0 && sscanf(buf, "%d", &i) > 0)
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p->make_it_fail = (i == 0) ? 0 : 1;
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return count;
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}
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#endif
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static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL);
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static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
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static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
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static DEVICE_ATTR(ro, S_IRUGO, part_ro_show, NULL);
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static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL);
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static DEVICE_ATTR(discard_alignment, S_IRUGO, part_discard_alignment_show,
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NULL);
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static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
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static DEVICE_ATTR(inflight, S_IRUGO, 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, S_IRUGO|S_IWUSR, 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 delete_partition_rcu_cb(struct rcu_head *head)
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{
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struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
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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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void __delete_partition(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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call_rcu(&part->rcu_head, delete_partition_rcu_cb);
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}
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void delete_partition(struct gendisk *disk, int partno)
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{
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struct disk_part_tbl *ptbl = disk->part_tbl;
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struct hd_struct *part;
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if (partno >= ptbl->len)
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return;
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part = ptbl->part[partno];
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if (!part)
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return;
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rcu_assign_pointer(ptbl->part[partno], NULL);
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rcu_assign_pointer(ptbl->last_lookup, NULL);
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kobject_put(part->holder_dir);
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device_del(part_to_dev(part));
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hd_struct_kill(part);
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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, S_IRUSR | S_IRGRP | S_IROTH,
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whole_disk_show, NULL);
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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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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 = disk->part_tbl;
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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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if (!init_part_stats(p)) {
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err = -ENOMEM;
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goto out_free;
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}
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seqcount_init(&p->nr_sects_seq);
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pdev = part_to_dev(p);
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p->start_sect = start;
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p->alignment_offset =
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queue_limit_alignment_offset(&disk->queue->limits, start);
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p->discard_alignment =
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queue_limit_discard_alignment(&disk->queue->limits, 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 = alloc_part_info(disk);
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if (!pinfo)
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goto out_free_stats;
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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;
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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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p->holder_dir = kobject_create_and_add("holders", &pdev->kobj);
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if (!p->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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err = hd_ref_init(p);
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if (err) {
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if (flags & ADDPART_FLAG_WHOLEDISK)
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goto out_remove_file;
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goto out_del;
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}
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/* everything is up and running, commence */
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rcu_assign_pointer(ptbl->part[partno], p);
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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 p;
|
|
|
|
out_free_info:
|
|
free_part_info(p);
|
|
out_free_stats:
|
|
free_part_stats(p);
|
|
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);
|
|
blk_free_devt(devt);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
static int drop_partitions(struct gendisk *disk, struct block_device *bdev)
|
|
{
|
|
struct disk_part_iter piter;
|
|
struct hd_struct *part;
|
|
int res;
|
|
|
|
if (bdev->bd_part_count || bdev->bd_super)
|
|
return -EBUSY;
|
|
res = invalidate_partition(disk, 0);
|
|
if (res)
|
|
return res;
|
|
|
|
disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
|
|
while ((part = disk_part_iter_next(&piter)))
|
|
delete_partition(disk, part->partno);
|
|
disk_part_iter_exit(&piter);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool part_zone_aligned(struct gendisk *disk,
|
|
struct block_device *bdev,
|
|
sector_t from, sector_t size)
|
|
{
|
|
unsigned int zone_sectors = bdev_zone_sectors(bdev);
|
|
|
|
/*
|
|
* If this function is called, then the disk is a zoned block device
|
|
* (host-aware or host-managed). This can be detected even if the
|
|
* zoned block device support is disabled (CONFIG_BLK_DEV_ZONED not
|
|
* set). In this case, however, only host-aware devices will be seen
|
|
* as a block device is not created for host-managed devices. Without
|
|
* zoned block device support, host-aware drives can still be used as
|
|
* regular block devices (no zone operation) and their zone size will
|
|
* be reported as 0. Allow this case.
|
|
*/
|
|
if (!zone_sectors)
|
|
return true;
|
|
|
|
/*
|
|
* Check partition start and size alignement. If the drive has a
|
|
* smaller last runt zone, ignore it and allow the partition to
|
|
* use it. Check the zone size too: it should be a power of 2 number
|
|
* of sectors.
|
|
*/
|
|
if (WARN_ON_ONCE(!is_power_of_2(zone_sectors))) {
|
|
u32 rem;
|
|
|
|
div_u64_rem(from, zone_sectors, &rem);
|
|
if (rem)
|
|
return false;
|
|
if ((from + size) < get_capacity(disk)) {
|
|
div_u64_rem(size, zone_sectors, &rem);
|
|
if (rem)
|
|
return false;
|
|
}
|
|
|
|
} else {
|
|
|
|
if (from & (zone_sectors - 1))
|
|
return false;
|
|
if ((from + size) < get_capacity(disk) &&
|
|
(size & (zone_sectors - 1)))
|
|
return false;
|
|
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
|
|
{
|
|
struct parsed_partitions *state = NULL;
|
|
struct hd_struct *part;
|
|
int p, highest, res;
|
|
rescan:
|
|
if (state && !IS_ERR(state)) {
|
|
free_partitions(state);
|
|
state = NULL;
|
|
}
|
|
|
|
res = drop_partitions(disk, bdev);
|
|
if (res)
|
|
return res;
|
|
|
|
if (disk->fops->revalidate_disk)
|
|
disk->fops->revalidate_disk(disk);
|
|
check_disk_size_change(disk, bdev);
|
|
bdev->bd_invalidated = 0;
|
|
if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
|
|
return 0;
|
|
if (IS_ERR(state)) {
|
|
/*
|
|
* I/O error reading the partition table. If any
|
|
* partition code tried to read beyond EOD, retry
|
|
* after unlocking native capacity.
|
|
*/
|
|
if (PTR_ERR(state) == -ENOSPC) {
|
|
printk(KERN_WARNING "%s: partition table beyond EOD, ",
|
|
disk->disk_name);
|
|
if (disk_unlock_native_capacity(disk))
|
|
goto rescan;
|
|
}
|
|
return -EIO;
|
|
}
|
|
/*
|
|
* If any partition code tried to read beyond EOD, try
|
|
* unlocking native capacity even if partition table is
|
|
* 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 rescan;
|
|
}
|
|
|
|
/* 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);
|
|
|
|
/* add partitions */
|
|
for (p = 1; p < state->limit; p++) {
|
|
sector_t size, from;
|
|
|
|
size = state->parts[p].size;
|
|
if (!size)
|
|
continue;
|
|
|
|
from = state->parts[p].from;
|
|
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))
|
|
goto rescan;
|
|
continue;
|
|
}
|
|
|
|
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)) {
|
|
/* free state and restart */
|
|
goto rescan;
|
|
} else {
|
|
/*
|
|
* 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;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* On a zoned block device, partitions should be aligned on the
|
|
* device zone size (i.e. zone boundary crossing not allowed).
|
|
* Otherwise, resetting the write pointer of the last zone of
|
|
* one partition may impact the following partition.
|
|
*/
|
|
if (bdev_is_zoned(bdev) &&
|
|
!part_zone_aligned(disk, bdev, from, size)) {
|
|
printk(KERN_WARNING
|
|
"%s: p%d start %llu+%llu is not zone aligned\n",
|
|
disk->disk_name, p, (unsigned long long) from,
|
|
(unsigned long long) size);
|
|
continue;
|
|
}
|
|
|
|
part = add_partition(disk, p, from, size,
|
|
state->parts[p].flags,
|
|
&state->parts[p].info);
|
|
if (IS_ERR(part)) {
|
|
printk(KERN_ERR " %s: p%d could not be added: %ld\n",
|
|
disk->disk_name, p, -PTR_ERR(part));
|
|
continue;
|
|
}
|
|
#ifdef CONFIG_BLK_DEV_MD
|
|
if (state->parts[p].flags & ADDPART_FLAG_RAID)
|
|
md_autodetect_dev(part_to_dev(part)->devt);
|
|
#endif
|
|
}
|
|
free_partitions(state);
|
|
return 0;
|
|
}
|
|
|
|
int invalidate_partitions(struct gendisk *disk, struct block_device *bdev)
|
|
{
|
|
int res;
|
|
|
|
if (!bdev->bd_invalidated)
|
|
return 0;
|
|
|
|
res = drop_partitions(disk, bdev);
|
|
if (res)
|
|
return res;
|
|
|
|
set_capacity(disk, 0);
|
|
check_disk_size_change(disk, bdev);
|
|
bdev->bd_invalidated = 0;
|
|
/* tell userspace that the media / partition table may have changed */
|
|
kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
|
|
{
|
|
struct address_space *mapping = bdev->bd_inode->i_mapping;
|
|
struct page *page;
|
|
|
|
page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_SHIFT-9)), NULL);
|
|
if (!IS_ERR(page)) {
|
|
if (PageError(page))
|
|
goto fail;
|
|
p->v = page;
|
|
return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_SHIFT - 9)) - 1)) << 9);
|
|
fail:
|
|
put_page(page);
|
|
}
|
|
p->v = NULL;
|
|
return NULL;
|
|
}
|
|
|
|
EXPORT_SYMBOL(read_dev_sector);
|