On Fri, Mar 25, 2016 at 2:03 PM, Verma, Vishal L
<vishal.l.verma@xxxxxxxxx> wrote:
> On Fri, 2016-03-25 at 11:47 -0700, Dan Williams wrote:
>> On Thu, Mar 24, 2016 at 4:17 PM, Vishal Verma <vishal.l.verma@intel.c
>> om> wrote:
>> >
>> > From: Matthew Wilcox <matthew.r.wilcox@xxxxxxxxx>
>> >
>> > dax_clear_sectors() cannot handle poisoned blocks. These must be
>> > zeroed using the BIO interface instead. Convert ext2 and XFS to
>> > use
>> > only sb_issue_zerout().
>> >
>> > Signed-off-by: Matthew Wilcox <matthew.r.wilcox@xxxxxxxxx>
>> > [vishal: Also remove the dax_clear_sectors function entirely]
>> > Signed-off-by: Vishal Verma <vishal.l.verma@xxxxxxxxx>
>> > ---
>> > fs/dax.c | 32 --------------------------------
>> > fs/ext2/inode.c | 7 +++----
>> > fs/xfs/xfs_bmap_util.c | 9 ---------
>> > include/linux/dax.h | 1 -
>> > 4 files changed, 3 insertions(+), 46 deletions(-)
>> >
>> > diff --git a/fs/dax.c b/fs/dax.c
>> > index bb7e9f8..a30481e 100644
>> > --- a/fs/dax.c
>> > +++ b/fs/dax.c
>> > @@ -78,38 +78,6 @@ struct page *read_dax_sector(struct block_device
>> > *bdev, sector_t n)
>> > return page;
>> > }
>> >
>> > -/*
>> > - * dax_clear_sectors() is called from within transaction context
>> > from XFS,
>> > - * and hence this means the stack from this point must follow
>> > GFP_NOFS
>> > - * semantics for all operations.
>> > - */
>> > -int dax_clear_sectors(struct block_device *bdev, sector_t _sector,
>> > long _size)
>> > -{
>> > - struct blk_dax_ctl dax = {
>> > - .sector = _sector,
>> > - .size = _size,
>> > - };
>> > -
>> > - might_sleep();
>> > - do {
>> > - long count, sz;
>> > -
>> > - count = dax_map_atomic(bdev, &dax);
>> > - if (count < 0)
>> > - return count;
>> > - sz = min_t(long, count, SZ_128K);
>> > - clear_pmem(dax.addr, sz);
>> > - dax.size -= sz;
>> > - dax.sector += sz / 512;
>> > - dax_unmap_atomic(bdev, &dax);
>> > - cond_resched();
>> > - } while (dax.size);
>> > -
>> > - wmb_pmem();
>> > - return 0;
>> > -}
>> > -EXPORT_SYMBOL_GPL(dax_clear_sectors);
>> What about the other unwritten extent conversions in the dax path?
>> Shouldn't those be converted to block-layer zero-outs as well?
>
> Could you point me to where these might be? I thought once we've
> converted all the zeroout type callers (by removing dax_clear_sectors),
> and fixed up dax_do_io to try a driver fallback, we've handled all the
> media error cases in dax..
grep for usages of clear_pmem()... which I was hoping to eliminate
after this change to push zeroing down to the driver.
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