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DAX PMD support was added via the following commit:
commit e7b1ea2ad658 ("ext2: huge page fault support")
I believe this path to be untested as ext2 doesn't reliably provide block
allocations that are aligned to 2MiB. In my testing I've been unable to
get ext2 to actually fault in a PMD. It alw
Currently when doing a DAX hole punch with ext4 we fail to do a writeback.
This is because the logic around filemap_write_and_wait_range() in
ext4_punch_hole() only looks for dirty page cache pages in the radix tree,
not for dirty DAX exceptional entries.
Signed-off-by: Ross Zwisler
Reviewed-by:
The RADIX_DAX_* defines currently mostly live in fs/dax.c, with just
RADIX_DAX_ENTRY_LOCK being in include/linux/dax.h so it can be used in
mm/filemap.c. When we add PMD support, though, mm/filemap.c will also need
access to the RADIX_DAX_PTE type so it can properly construct a 4k sized
empty entr
Currently iomap_end() doesn't do anything for DAX page faults for both ext2
and XFS. ext2_iomap_end() just checks for a write underrun, and
xfs_file_iomap_end() checks to see if it needs to finish a delayed
allocation. However, in the future iomap_end() calls might be needed to
make sure we have
DAX PMDs have been disabled since Jan Kara introduced DAX radix tree based
locking. This series allows DAX PMDs to participate in the DAX radix tree
based locking scheme so that they can be re-enabled.
For now I'm still using the same baseline for this series as I did with v5.
I'll update the bas
When DAX calls _ext4_get_block() and the file offset points to a hole we
currently don't set bh->b_size. This is current worked around via
buffer_size_valid() in fs/dax.c.
_ext4_get_block() has the hole size information from ext4_map_blocks(), so
populate bh->b_size so we can remove buffer_size_v
No functional change.
The static functions put_locked_mapping_entry() and
put_unlocked_mapping_entry() will soon be used in error cases in
grab_mapping_entry(), so move their definitions above this function.
Signed-off-by: Ross Zwisler
---
fs/dax.c | 50 +
Now that DAX PMD faults are once again working and are now participating in
DAX's radix tree locking scheme, allow their config option to be enabled.
Signed-off-by: Ross Zwisler
---
fs/Kconfig | 1 -
1 file changed, 1 deletion(-)
diff --git a/fs/Kconfig b/fs/Kconfig
index 2bc7ad7..b6f0fce 10064
DAX radix tree locking currently locks entries based on the unique
combination of the 'mapping' pointer and the pgoff_t 'index' for the entry.
This works for PTEs, but as we move to PMDs we will need to have all the
offsets within the range covered by the PMD to map to the same bit lock.
To accompl
The recently added DAX functions that use the new struct iomap data
structure were named iomap_dax_rw(), iomap_dax_fault() and
iomap_dax_actor(). These are actually defined in fs/dax.c, though, so
should be part of the "dax" namespace and not the "iomap" namespace.
Rename them to dax_iomap_rw(), d
Now that ext4 properly sets bh.b_size when we call get_block() for a hole,
rely on that value and remove the buffer_size_valid() sanity check.
Signed-off-by: Ross Zwisler
Reviewed-by: Jan Kara
Reviewed-by: Christoph Hellwig
---
fs/dax.c | 22 +-
1 file changed, 1 insertion(
Switch xfs_filemap_pmd_fault() from using dax_pmd_fault() to the new and
improved dax_iomap_pmd_fault(). Also, now that it has no more users,
remove xfs_get_blocks_dax_fault().
Signed-off-by: Ross Zwisler
Reviewed-by: Jan Kara
---
fs/xfs/xfs_aops.c | 26 +-
fs/xfs/xfs_a
The global 'wait_table' variable is only used within fs/dax.c, and
generates the following sparse warning:
fs/dax.c:39:19: warning: symbol 'wait_table' was not declared. Should it be
static?
Make it static so it has scope local to fs/dax.c, and to make sparse happy.
Signed-off-by: Ross Zwisler
To be able to correctly calculate the sector from a file position and a
struct iomap there is a complex little bit of logic that currently happens
in both dax_iomap_actor() and dax_iomap_fault(). This will need to be
repeated yet again in the DAX PMD fault handler when it is added, so break
it out
DAX PMDs have been disabled since Jan Kara introduced DAX radix tree based
locking. This patch allows DAX PMDs to participate in the DAX radix tree
based locking scheme so that they can be re-enabled using the new struct
iomap based fault handlers.
There are currently three types of DAX 4k entrie
No functional change.
Consistently use the variable name 'entry' instead of 'ret' for DAX radix
tree entries. This was already happening in most of the code, so update
get_unlocked_mapping_entry(), grab_mapping_entry() and
dax_unlock_mapping_entry().
Signed-off-by: Ross Zwisler
Reviewed-by: Chr
Don't take down the kernel if we get an invalid 'from' and 'length'
argument pair. Just warn once and return an error.
Signed-off-by: Ross Zwisler
Reviewed-by: Christoph Hellwig
Reviewed-by: Jan Kara
---
fs/dax.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/dax.c b
dax_pmd_fault() is the old struct buffer_head + get_block_t based 2 MiB DAX
fault handler. This fault handler has been disabled for several kernel
releases, and support for PMDs will be reintroduced using the struct iomap
interface instead.
Signed-off-by: Ross Zwisler
Reviewed-by: Christoph Hell
On Tue, Oct 11, 2016 at 11:34 PM, Dan Carpenter
wrote:
> If the kcalloc() fails then "devs" can be NULL and we dereference it
> checking "devs[i]".
>
> Fixes: 1b40e09a1232 ('libnvdimm: blk labels and namespace instantiation')
> Signed-off-by: Dan Carpenter
Thanks, applied.
__
Fix warnings of the form:
libndctl-hpe1.c: In function 'hpe1_smart_valid':
libndctl-hpe1.c:78:15: warning: dereferencing type-punned pointer will
break strict-aliasing rules [-Wstrict-aliasing]
CMD_HPE1(cmd)->gen.nd_family != NVDIMM_FAMILY_HPE1 ||
^
libndctl-hpe
Commit 917db484dc6a "x86/boot: Fix kdump, cleanup aborted E820_PRAM
max_pfn manipulation" fixed up the broken manipulations of max_pfn in
the presence of E820_PRAM ranges. However, it also broke the
sanitize_e820_map() support for not merging E820_PRAM ranges.
Re-introduce the enabling to keep reso
On Wed, Oct 12, 2016 at 9:01 AM, Jan Beulich wrote:
On 12.10.16 at 17:42, wrote:
>> On Wed, Oct 12, 2016 at 8:39 AM, Jan Beulich wrote:
>> On 12.10.16 at 16:58, wrote:
On 10/12/16 05:32 -0600, Jan Beulich wrote:
On 12.10.16 at 12:33, wrote:
>> The layout is shown as
>>> On 12.10.16 at 17:42, wrote:
> On Wed, Oct 12, 2016 at 8:39 AM, Jan Beulich wrote:
> On 12.10.16 at 16:58, wrote:
>>> On 10/12/16 05:32 -0600, Jan Beulich wrote:
>>> On 12.10.16 at 12:33, wrote:
> The layout is shown as the following diagram.
>
> +---+---
On Wed, Oct 12, 2016 at 8:39 AM, Jan Beulich wrote:
On 12.10.16 at 16:58, wrote:
>> On 10/12/16 05:32 -0600, Jan Beulich wrote:
>> On 12.10.16 at 12:33, wrote:
The layout is shown as the following diagram.
+---+---+---+--+--+
>>
>>> On 12.10.16 at 16:58, wrote:
> On 10/12/16 05:32 -0600, Jan Beulich wrote:
> On 12.10.16 at 12:33, wrote:
>>> The layout is shown as the following diagram.
>>>
>>> +---+---+---+--+--+
>>> | whatever used | Partition | Super | Reserved | /dev/pme
On 10/12/16 05:32 -0600, Jan Beulich wrote:
On 12.10.16 at 12:33, wrote:
The layout is shown as the following diagram.
+---+---+---+--+--+
| whatever used | Partition | Super | Reserved | /dev/pmem0p1 |
| by kernel| Table | Block | for Xen
>>> On 12.10.16 at 12:33, wrote:
> The layout is shown as the following diagram.
>
> +---+---+---+--+--+
> | whatever used | Partition | Super | Reserved | /dev/pmem0p1 |
> | by kernel| Table | Block | for Xen | |
> +-
On 10/11/16 13:17 -0700, Dan Williams wrote:
On Tue, Oct 11, 2016 at 12:48 PM, Konrad Rzeszutek Wilk
wrote:
On Tue, Oct 11, 2016 at 12:28:56PM -0700, Dan Williams wrote:
On Tue, Oct 11, 2016 at 11:33 AM, Konrad Rzeszutek Wilk
wrote:
> On Tue, Oct 11, 2016 at 10:51:19AM -0700, Dan Williams wro
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On Tue 11-10-16 16:51:30, Ross Zwisler wrote:
> On Tue, Oct 11, 2016 at 10:31:52AM +0200, Jan Kara wrote:
> > On Fri 07-10-16 15:09:02, Ross Zwisler wrote:
> > > diff --git a/fs/dax.c b/fs/dax.c
> > > index ac3cd05..e51d51f 100644
> > > --- a/fs/dax.c
> > > +++ b/fs/dax.c
> > > @@ -281,7 +281,7 @@
>>> On 11.10.16 at 17:53, wrote:
> On Tue, Oct 11, 2016 at 6:08 AM, Jan Beulich wrote:
> Andrew Cooper 10/10/16 6:44 PM >>>
>>>On 10/10/16 01:35, Haozhong Zhang wrote:
Xen hypervisor needs assistance from Dom0 Linux kernel for following tasks:
1) Reserve an area on NVDIMM devices f
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