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authorLinus Torvalds <torvalds@linux-foundation.org>2017-11-17 09:51:57 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-11-17 09:51:57 -0800
commita3841f94c7ecb3ede0f888d3fcfe8fb6368ddd7a (patch)
tree6625eedf10d0672068ee218bb893a5a0e1803df2 /drivers/block
parentadeba81ac2a6451f44545874da3d181081f0ab04 (diff)
parent4247f24c23589bcc3bc3490515ef8c9497e9ae55 (diff)
Merge tag 'libnvdimm-for-4.15' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
Pull libnvdimm and dax updates from Dan Williams: "Save for a few late fixes, all of these commits have shipped in -next releases since before the merge window opened, and 0day has given a build success notification. The ext4 touches came from Jan, and the xfs touches have Darrick's reviewed-by. An xfstest for the MAP_SYNC feature has been through a few round of reviews and is on track to be merged. - Introduce MAP_SYNC and MAP_SHARED_VALIDATE, a mechanism to enable 'userspace flush' of persistent memory updates via filesystem-dax mappings. It arranges for any filesystem metadata updates that may be required to satisfy a write fault to also be flushed ("on disk") before the kernel returns to userspace from the fault handler. Effectively every write-fault that dirties metadata completes an fsync() before returning from the fault handler. The new MAP_SHARED_VALIDATE mapping type guarantees that the MAP_SYNC flag is validated as supported by the filesystem's ->mmap() file operation. - Add support for the standard ACPI 6.2 label access methods that replace the NVDIMM_FAMILY_INTEL (vendor specific) label methods. This enables interoperability with environments that only implement the standardized methods. - Add support for the ACPI 6.2 NVDIMM media error injection methods. - Add support for the NVDIMM_FAMILY_INTEL v1.6 DIMM commands for latch last shutdown status, firmware update, SMART error injection, and SMART alarm threshold control. - Cleanup physical address information disclosures to be root-only. - Fix revalidation of the DIMM "locked label area" status to support dynamic unlock of the label area. - Expand unit test infrastructure to mock the ACPI 6.2 Translate SPA (system-physical-address) command and error injection commands. Acknowledgements that came after the commits were pushed to -next: - 957ac8c421ad ("dax: fix PMD faults on zero-length files"): Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> - a39e596baa07 ("xfs: support for synchronous DAX faults") and 7b565c9f965b ("xfs: Implement xfs_filemap_pfn_mkwrite() using __xfs_filemap_fault()") Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>" * tag 'libnvdimm-for-4.15' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: (49 commits) acpi, nfit: add 'Enable Latch System Shutdown Status' command support dax: fix general protection fault in dax_alloc_inode dax: fix PMD faults on zero-length files dax: stop requiring a live device for dax_flush() brd: remove dax support dax: quiet bdev_dax_supported() fs, dax: unify IOMAP_F_DIRTY read vs write handling policy in the dax core tools/testing/nvdimm: unit test clear-error commands acpi, nfit: validate commands against the device type tools/testing/nvdimm: stricter bounds checking for error injection commands xfs: support for synchronous DAX faults xfs: Implement xfs_filemap_pfn_mkwrite() using __xfs_filemap_fault() ext4: Support for synchronous DAX faults ext4: Simplify error handling in ext4_dax_huge_fault() dax: Implement dax_finish_sync_fault() dax, iomap: Add support for synchronous faults mm: Define MAP_SYNC and VM_SYNC flags dax: Allow tuning whether dax_insert_mapping_entry() dirties entry dax: Allow dax_iomap_fault() to return pfn dax: Fix comment describing dax_iomap_fault() ...
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/Kconfig12
-rw-r--r--drivers/block/brd.c65
2 files changed, 0 insertions, 77 deletions
diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index 923b417eaf4c..40579d0cb3d1 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -302,7 +302,6 @@ config BLK_DEV_SX8
config BLK_DEV_RAM
tristate "RAM block device support"
- select DAX if BLK_DEV_RAM_DAX
---help---
Saying Y here will allow you to use a portion of your RAM memory as
a block device, so that you can make file systems on it, read and
@@ -338,17 +337,6 @@ config BLK_DEV_RAM_SIZE
The default value is 4096 kilobytes. Only change this if you know
what you are doing.
-config BLK_DEV_RAM_DAX
- bool "Support Direct Access (DAX) to RAM block devices"
- depends on BLK_DEV_RAM && FS_DAX
- default n
- help
- Support filesystems using DAX to access RAM block devices. This
- avoids double-buffering data in the page cache before copying it
- to the block device. Answering Y will slightly enlarge the kernel,
- and will prevent RAM block device backing store memory from being
- allocated from highmem (only a problem for highmem systems).
-
config CDROM_PKTCDVD
tristate "Packet writing on CD/DVD media (DEPRECATED)"
depends on !UML
diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index 588360d79fca..8028a3a7e7fd 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -21,11 +21,6 @@
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/backing-dev.h>
-#ifdef CONFIG_BLK_DEV_RAM_DAX
-#include <linux/pfn_t.h>
-#include <linux/dax.h>
-#include <linux/uio.h>
-#endif
#include <linux/uaccess.h>
@@ -45,9 +40,6 @@ struct brd_device {
struct request_queue *brd_queue;
struct gendisk *brd_disk;
-#ifdef CONFIG_BLK_DEV_RAM_DAX
- struct dax_device *dax_dev;
-#endif
struct list_head brd_list;
/*
@@ -112,9 +104,6 @@ static struct page *brd_insert_page(struct brd_device *brd, sector_t sector)
* restriction might be able to be lifted.
*/
gfp_flags = GFP_NOIO | __GFP_ZERO;
-#ifndef CONFIG_BLK_DEV_RAM_DAX
- gfp_flags |= __GFP_HIGHMEM;
-#endif
page = alloc_page(gfp_flags);
if (!page)
return NULL;
@@ -334,43 +323,6 @@ static int brd_rw_page(struct block_device *bdev, sector_t sector,
return err;
}
-#ifdef CONFIG_BLK_DEV_RAM_DAX
-static long __brd_direct_access(struct brd_device *brd, pgoff_t pgoff,
- long nr_pages, void **kaddr, pfn_t *pfn)
-{
- struct page *page;
-
- if (!brd)
- return -ENODEV;
- page = brd_insert_page(brd, (sector_t)pgoff << PAGE_SECTORS_SHIFT);
- if (!page)
- return -ENOSPC;
- *kaddr = page_address(page);
- *pfn = page_to_pfn_t(page);
-
- return 1;
-}
-
-static long brd_dax_direct_access(struct dax_device *dax_dev,
- pgoff_t pgoff, long nr_pages, void **kaddr, pfn_t *pfn)
-{
- struct brd_device *brd = dax_get_private(dax_dev);
-
- return __brd_direct_access(brd, pgoff, nr_pages, kaddr, pfn);
-}
-
-static size_t brd_dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff,
- void *addr, size_t bytes, struct iov_iter *i)
-{
- return copy_from_iter(addr, bytes, i);
-}
-
-static const struct dax_operations brd_dax_ops = {
- .direct_access = brd_dax_direct_access,
- .copy_from_iter = brd_dax_copy_from_iter,
-};
-#endif
-
static const struct block_device_operations brd_fops = {
.owner = THIS_MODULE,
.rw_page = brd_rw_page,
@@ -451,21 +403,8 @@ static struct brd_device *brd_alloc(int i)
set_capacity(disk, rd_size * 2);
disk->queue->backing_dev_info->capabilities |= BDI_CAP_SYNCHRONOUS_IO;
-#ifdef CONFIG_BLK_DEV_RAM_DAX
- queue_flag_set_unlocked(QUEUE_FLAG_DAX, brd->brd_queue);
- brd->dax_dev = alloc_dax(brd, disk->disk_name, &brd_dax_ops);
- if (!brd->dax_dev)
- goto out_free_inode;
-#endif
-
-
return brd;
-#ifdef CONFIG_BLK_DEV_RAM_DAX
-out_free_inode:
- kill_dax(brd->dax_dev);
- put_dax(brd->dax_dev);
-#endif
out_free_queue:
blk_cleanup_queue(brd->brd_queue);
out_free_dev:
@@ -505,10 +444,6 @@ out:
static void brd_del_one(struct brd_device *brd)
{
list_del(&brd->brd_list);
-#ifdef CONFIG_BLK_DEV_RAM_DAX
- kill_dax(brd->dax_dev);
- put_dax(brd->dax_dev);
-#endif
del_gendisk(brd->brd_disk);
brd_free(brd);
}