From f5c54717bf2b9e052bb69d6ee19fe22e87817079 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Tue, 13 Mar 2018 23:15:32 -0700
Subject: [PATCH] xfs: remove xfs_zero_range
Git-commit: f5c54717bf2b9e052bb69d6ee19fe22e87817079
Patch-mainline: v4.17-rc1
References: bsc#1106011

This helper doesn't add any real value over just calling iomap_zero_range
directly, so remove it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Acked-by: Anthony Iliopoulos <ailiopoulos@suse.com>

---
 fs/xfs/xfs_bmap_util.c | 11 ++++-------
 fs/xfs/xfs_file.c      | 48 +++++++-----------------------------------------
 fs/xfs/xfs_inode.h     |  4 ----
 fs/xfs/xfs_iops.c      |  4 +++-
 4 files changed, 14 insertions(+), 53 deletions(-)

diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index 19ea7d086cf8..05dee8fdd895 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -1208,18 +1208,15 @@ xfs_free_file_space(
 
 	/*
 	 * Now that we've unmap all full blocks we'll have to zero out any
-	 * partial block at the beginning and/or end.  xfs_zero_range is
-	 * smart enough to skip any holes, including those we just created,
-	 * but we must take care not to zero beyond EOF and enlarge i_size.
+	 * partial block at the beginning and/or end.  iomap_zero_range is smart
+	 * enough to skip any holes, including those we just created, but we
+	 * must take care not to zero beyond EOF and enlarge i_size.
 	 */
-
 	if (offset >= XFS_ISIZE(ip))
 		return 0;
-
 	if (offset + len > XFS_ISIZE(ip))
 		len = XFS_ISIZE(ip) - offset;
-
-	return xfs_zero_range(ip, offset, len, NULL);
+	return iomap_zero_range(VFS_I(ip), offset, len, NULL, &xfs_iomap_ops);
 }
 
 /*
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index f5c5dbbf1792..299aee4b7b0b 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -48,20 +48,6 @@
 
 static const struct vm_operations_struct xfs_file_vm_ops;
 
-/*
- * Clear the specified ranges to zero through either the pagecache or DAX.
- * Holes and unwritten extents will be left as-is as they already are zeroed.
- */
-int
-xfs_zero_range(
-	struct xfs_inode	*ip,
-	xfs_off_t		pos,
-	xfs_off_t		count,
-	bool			*did_zero)
-{
-	return iomap_zero_range(VFS_I(ip), pos, count, did_zero, &xfs_iomap_ops);
-}
-
 int
 xfs_update_prealloc_flags(
 	struct xfs_inode	*ip,
@@ -300,31 +286,6 @@ xfs_file_read_iter(
 	return ret;
 }
 
-/*
- * Zero any on disk space between the current EOF and the new, larger EOF.
- *
- * This handles the normal case of zeroing the remainder of the last block in
- * the file and the unusual case of zeroing blocks out beyond the size of the
- * file.  This second case only happens with fixed size extents and when the
- * system crashes before the inode size was updated but after blocks were
- * allocated.
- *
- * Expects the iolock to be held exclusive, and will take the ilock internally.
- */
-int					/* error (positive) */
-xfs_zero_eof(
-	struct xfs_inode	*ip,
-	xfs_off_t		offset,		/* starting I/O offset */
-	xfs_fsize_t		isize,		/* current inode size */
-	bool			*did_zeroing)
-{
-	ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
-	ASSERT(offset > isize);
-
-	trace_xfs_zero_eof(ip, isize, offset - isize);
-	return xfs_zero_range(ip, isize, offset - isize, did_zeroing);
-}
-
 /*
  * Common pre-write limit and setup checks.
  *
@@ -344,6 +305,7 @@ xfs_file_aio_write_checks(
 	ssize_t			error = 0;
 	size_t			count = iov_iter_count(from);
 	bool			drained_dio = false;
+	loff_t			isize;
 
 restart:
 	error = generic_write_checks(iocb, from);
@@ -380,7 +342,8 @@ xfs_file_aio_write_checks(
 	 * and hence be able to correctly determine if we need to run zeroing.
 	 */
 	spin_lock(&ip->i_flags_lock);
-	if (iocb->ki_pos > i_size_read(inode)) {
+	isize = i_size_read(inode);
+	if (iocb->ki_pos > isize) {
 		spin_unlock(&ip->i_flags_lock);
 		if (!drained_dio) {
 			if (*iolock == XFS_IOLOCK_SHARED) {
@@ -401,7 +364,10 @@ xfs_file_aio_write_checks(
 			drained_dio = true;
 			goto restart;
 		}
-		error = xfs_zero_eof(ip, iocb->ki_pos, i_size_read(inode), NULL);
+	
+		trace_xfs_zero_eof(ip, isize, iocb->ki_pos - isize);
+		error = iomap_zero_range(inode, isize, iocb->ki_pos - isize,
+				NULL, &xfs_iomap_ops);
 		if (error)
 			return error;
 	} else
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index 3e8dc990d41c..132d8aa2afc4 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -443,10 +443,6 @@ enum xfs_prealloc_flags {
 
 int	xfs_update_prealloc_flags(struct xfs_inode *ip,
 				  enum xfs_prealloc_flags flags);
-int	xfs_zero_eof(struct xfs_inode *ip, xfs_off_t offset,
-		     xfs_fsize_t isize, bool *did_zeroing);
-int	xfs_zero_range(struct xfs_inode *ip, xfs_off_t pos, xfs_off_t count,
-		bool *did_zero);
 
 /* from xfs_iops.c */
 extern void xfs_setup_inode(struct xfs_inode *ip);
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index 8567951eff10..e0307fbff911 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -875,7 +875,9 @@ xfs_setattr_size(
 	 * truncate.
 	 */
 	if (newsize > oldsize) {
-		error = xfs_zero_eof(ip, newsize, oldsize, &did_zeroing);
+		trace_xfs_zero_eof(ip, oldsize, newsize - oldsize);
+		error = iomap_zero_range(inode, oldsize, newsize - oldsize,
+				&did_zeroing, &xfs_iomap_ops);
 	} else {
 		error = iomap_truncate_page(inode, newsize, &did_zeroing,
 				&xfs_iomap_ops);
-- 
2.16.4