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Date: Fri, 6 May 2016 15:53:09 -0600
From: Vishal Verma <vishal.l.verma@...el.com>
To: linux-nvdimm@...ts.01.org
Cc: Matthew Wilcox <matthew.r.wilcox@...el.com>,
linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
xfs@....sgi.com, linux-ext4@...r.kernel.org, linux-mm@...ck.org,
Ross Zwisler <ross.zwisler@...ux.intel.com>,
Dan Williams <dan.j.williams@...el.com>,
Dave Chinner <david@...morbit.com>, Jan Kara <jack@...e.cz>,
Jens Axboe <axboe@...com>,
Andrew Morton <akpm@...ux-foundation.org>,
linux-kernel@...r.kernel.org,
Christoph Hellwig <hch@...radead.org>,
Jeff Moyer <jmoyer@...hat.com>,
Boaz Harrosh <boaz@...xistor.com>,
Vishal Verma <vishal.l.verma@...el.com>
Subject: [PATCH v5 3/5] dax: use sb_issue_zerout instead of calling dax_clear_sectors
From: Matthew Wilcox <matthew.r.wilcox@...el.com>
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@...el.com>
[vishal: Also remove the dax_clear_sectors function entirely]
Signed-off-by: Vishal Verma <vishal.l.verma@...el.com>
---
fs/dax.c | 32 --------------------------------
fs/ext2/inode.c | 7 +++----
fs/xfs/xfs_bmap_util.c | 15 ++++-----------
include/linux/dax.h | 1 -
4 files changed, 7 insertions(+), 48 deletions(-)
diff --git a/fs/dax.c b/fs/dax.c
index 52f0044..5948d9b 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -116,38 +116,6 @@ 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);
-
static bool buffer_written(struct buffer_head *bh)
{
return buffer_mapped(bh) && !buffer_unwritten(bh);
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 1f07b75..35f2b0bf 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -26,6 +26,7 @@
#include <linux/highuid.h>
#include <linux/pagemap.h>
#include <linux/dax.h>
+#include <linux/blkdev.h>
#include <linux/quotaops.h>
#include <linux/writeback.h>
#include <linux/buffer_head.h>
@@ -737,10 +738,8 @@ static int ext2_get_blocks(struct inode *inode,
* so that it's not found by another thread before it's
* initialised
*/
- err = dax_clear_sectors(inode->i_sb->s_bdev,
- le32_to_cpu(chain[depth-1].key) <<
- (inode->i_blkbits - 9),
- 1 << inode->i_blkbits);
+ err = sb_issue_zeroout(inode->i_sb,
+ le32_to_cpu(chain[depth-1].key), 1, GFP_NOFS);
if (err) {
mutex_unlock(&ei->truncate_mutex);
goto cleanup;
diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index 3b63098..930ac6a 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -72,18 +72,11 @@ xfs_zero_extent(
struct xfs_mount *mp = ip->i_mount;
xfs_daddr_t sector = xfs_fsb_to_db(ip, start_fsb);
sector_t block = XFS_BB_TO_FSBT(mp, sector);
- ssize_t size = XFS_FSB_TO_B(mp, count_fsb);
-
- if (IS_DAX(VFS_I(ip)))
- return dax_clear_sectors(xfs_find_bdev_for_inode(VFS_I(ip)),
- sector, size);
-
- /*
- * let the block layer decide on the fastest method of
- * implementing the zeroing.
- */
- return sb_issue_zeroout(mp->m_super, block, count_fsb, GFP_NOFS);
+ return blkdev_issue_zeroout(xfs_find_bdev_for_inode(VFS_I(ip)),
+ block << (mp->m_super->s_blocksize_bits - 9),
+ count_fsb << (mp->m_super->s_blocksize_bits - 9),
+ GFP_NOFS, true);
}
/*
diff --git a/include/linux/dax.h b/include/linux/dax.h
index ef94fa7..426841a 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -11,7 +11,6 @@
ssize_t dax_do_io(struct kiocb *, struct inode *, struct iov_iter *, loff_t,
get_block_t, dio_iodone_t, int flags);
-int dax_clear_sectors(struct block_device *bdev, sector_t _sector, long _size);
int dax_zero_page_range(struct inode *, loff_t from, unsigned len, get_block_t);
int dax_truncate_page(struct inode *, loff_t from, get_block_t);
int dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t);
--
2.5.5
--
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