dax: require 'struct page' by default for filesystem dax

If a dax buffer from a device that does not map pages is passed to
read(2) or write(2) as a target for direct-I/O it triggers SIGBUS. If
gdb attempts to examine the contents of a dax buffer from a device that
does not map pages it triggers SIGBUS. If fork(2) is called on a process
with a dax mapping from a device that does not map pages it triggers
SIGBUS. 'struct page' is required otherwise several kernel code paths
break in surprising ways. Disable filesystem-dax on devices that do not
map pages.

In addition to needing pfn_to_page() to be valid we also require devmap
pages.  We need this to detect dax pages in the get_user_pages_fast()
path and so that we can stop managing the VM_MIXEDMAP flag. For DAX
drivers that have not supported get_user_pages() to date we allow them
to opt-in to supporting DAX with the CONFIG_FS_DAX_LIMITED configuration
option which requires ->direct_access() to return pfn_t_special() pfns.
This leaves DAX support in brd disabled and scheduled for removal.

Note that when the initial dax support was being merged a few years back
there was concern that struct page was unsuitable for use with next
generation persistent memory devices. The theoretical concern was that
struct page access, being such a hotly used data structure in the
kernel, would lead to media wear out. While that was a reasonable
conservative starting position it has not held true in practice. We have
long since committed to using devm_memremap_pages() to support higher
order kernel functionality that needs get_user_pages() and
pfn_to_page().

Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig
index 5a96a2763e4ae176cc5c6215db5da793f2fb81d5..2ce89b42a9f463298c70107f6c83d8c6d396aae7 100644 (file)
--- a/arch/powerpc/platforms/Kconfig
+++ b/arch/powerpc/platforms/Kconfig
@@ -297,6 +297,7 @@ config AXON_RAM
        tristate "Axon DDR2 memory device driver"
        depends on PPC_IBM_CELL_BLADE && BLOCK
        select DAX
+       select FS_DAX_LIMITED
        default m
        help
          It registers one block device per Axon's DDR2 memory bank found

diff --git a/drivers/dax/super.c b/drivers/dax/super.c
index 3ec8046726017bad8afe69e120a0c54e0f9f5229..473af694ad1cbee97db06646a715776a5d9e7889 100644 (file)
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c
@@ -15,6 +15,7 @@
 #include <linux/mount.h>
 #include <linux/magic.h>
 #include <linux/genhd.h>
+#include <linux/pfn_t.h>
 #include <linux/cdev.h>
 #include <linux/hash.h>
 #include <linux/slab.h>
@@ -123,6 +124,15 @@ int __bdev_dax_supported(struct super_block *sb, int blocksize)
                return len < 0 ? len : -EIO;
        }
 
+       if ((IS_ENABLED(CONFIG_FS_DAX_LIMITED) && pfn_t_special(pfn))
+                       || pfn_t_devmap(pfn))
+               /* pass */;
+       else {
+               pr_debug("VFS (%s): error: dax support not enabled\n",
+                               sb->s_id);
+               return -EOPNOTSUPP;
+       }
+
        return 0;
 }
 EXPORT_SYMBOL_GPL(__bdev_dax_supported);

diff --git a/drivers/s390/block/Kconfig b/drivers/s390/block/Kconfig
index bc27d716aa6b2d404863a22a4242c2ccbd9fc6e6..1444333210c74929479cdaf2b9b411b74eb74b95 100644 (file)
--- a/drivers/s390/block/Kconfig
+++ b/drivers/s390/block/Kconfig
@@ -16,6 +16,7 @@ config BLK_DEV_XPRAM
 config DCSSBLK
        def_tristate m
        select DAX
+       select FS_DAX_LIMITED
        prompt "DCSSBLK support"
        depends on S390 && BLOCK
        help

diff --git a/fs/Kconfig b/fs/Kconfig
index 7aee6d699fd6b38949df0563281473c3afb445c2..b40128bf6d1a98da68c1d365913f32b9f6cf3b80 100644 (file)
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -58,6 +58,13 @@ config FS_DAX_PMD
        depends on ZONE_DEVICE
        depends on TRANSPARENT_HUGEPAGE
 
+# Selected by DAX drivers that do not expect filesystem DAX to support
+# get_user_pages() of DAX mappings. I.e. "limited" indicates no support
+# for fork() of processes with MAP_SHARED mappings or support for
+# direct-I/O to a DAX mapping.
+config FS_DAX_LIMITED
+       bool
+
 endif # BLOCK
 
 # Posix ACL utility routines