Subject: [PATCH RFC PKS/PMEM 17/58] fs/nilfs2: Utilize new kmap_thread()

From: [email-masked]
Date: Fri, 9 Oct 2020 12:49:52 -0700

From: Ira Weiny <[email-masked]>

The kmap() calls in this FS are localized to a single thread.  To avoid
the over head of global PKRS updates use the new kmap_thread() call.

Cc: Ryusuke Konishi <[email-masked]>
Signed-off-by: Ira Weiny <[email-masked]>
---
 fs/nilfs2/alloc.c  | 34 +++++++++++++++++-----------------
 fs/nilfs2/cpfile.c |  4 ++--
 2 files changed, 19 insertions(+), 19 deletions(-)

diff --git a/fs/nilfs2/alloc.c b/fs/nilfs2/alloc.c
index adf3bb0a8048..2aa4c34094ef 100644
--- a/fs/nilfs2/alloc.c
+++ b/fs/nilfs2/alloc.c
@@ -524,7 +524,7 @@ int nilfs_palloc_prepare_alloc_entry(struct inode *inode,
 		ret = nilfs_palloc_get_desc_block(inode, group, 1, &desc_bh);
 		if (ret < 0)
 			return ret;
-		desc_kaddr = kmap(desc_bh->b_page);
+		desc_kaddr = kmap_thread(desc_bh->b_page);
 		desc = nilfs_palloc_block_get_group_desc(
 			inode, group, desc_bh, desc_kaddr);
 		n = nilfs_palloc_rest_groups_in_desc_block(inode, group,
@@ -536,7 +536,7 @@ int nilfs_palloc_prepare_alloc_entry(struct inode *inode,
 					inode, group, 1, &bitmap_bh);
 				if (ret < 0)
 					goto out_desc;
-				bitmap_kaddr = kmap(bitmap_bh->b_page);
+				bitmap_kaddr = kmap_thread(bitmap_bh->b_page);
 				bitmap = bitmap_kaddr + bh_offset(bitmap_bh);
 				pos = nilfs_palloc_find_available_slot(
 					bitmap, group_offset,
@@ -547,21 +547,21 @@ int nilfs_palloc_prepare_alloc_entry(struct inode *inode,
 						desc, lock, -1);
 					req->pr_entry_nr =
 						entries_per_group * group + pos;
-					kunmap(desc_bh->b_page);
-					kunmap(bitmap_bh->b_page);
+					kunmap_thread(desc_bh->b_page);
+					kunmap_thread(bitmap_bh->b_page);
 
 					req->pr_desc_bh = desc_bh;
 					req->pr_bitmap_bh = bitmap_bh;
 					return 0;
 				}
-				kunmap(bitmap_bh->b_page);
+				kunmap_thread(bitmap_bh->b_page);
 				brelse(bitmap_bh);
 			}
 
 			group_offset = 0;
 		}
 
-		kunmap(desc_bh->b_page);
+		kunmap_thread(desc_bh->b_page);
 		brelse(desc_bh);
 	}
 
@@ -569,7 +569,7 @@ int nilfs_palloc_prepare_alloc_entry(struct inode *inode,
 	return -ENOSPC;
 
  out_desc:
-	kunmap(desc_bh->b_page);
+	kunmap_thread(desc_bh->b_page);
 	brelse(desc_bh);
 	return ret;
 }
@@ -605,10 +605,10 @@ void nilfs_palloc_commit_free_entry(struct inode *inode,
 	spinlock_t *lock;
 
 	group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);
-	desc_kaddr = kmap(req->pr_desc_bh->b_page);
+	desc_kaddr = kmap_thread(req->pr_desc_bh->b_page);
 	desc = nilfs_palloc_block_get_group_desc(inode, group,
 						 req->pr_desc_bh, desc_kaddr);
-	bitmap_kaddr = kmap(req->pr_bitmap_bh->b_page);
+	bitmap_kaddr = kmap_thread(req->pr_bitmap_bh->b_page);
 	bitmap = bitmap_kaddr + bh_offset(req->pr_bitmap_bh);
 	lock = nilfs_mdt_bgl_lock(inode, group);
 
@@ -620,8 +620,8 @@ void nilfs_palloc_commit_free_entry(struct inode *inode,
 	else
 		nilfs_palloc_group_desc_add_entries(desc, lock, 1);
 
-	kunmap(req->pr_bitmap_bh->b_page);
-	kunmap(req->pr_desc_bh->b_page);
+	kunmap_thread(req->pr_bitmap_bh->b_page);
+	kunmap_thread(req->pr_desc_bh->b_page);
 
 	mark_buffer_dirty(req->pr_desc_bh);
 	mark_buffer_dirty(req->pr_bitmap_bh);
@@ -646,10 +646,10 @@ void nilfs_palloc_abort_alloc_entry(struct inode *inode,
 	spinlock_t *lock;
 
 	group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);
-	desc_kaddr = kmap(req->pr_desc_bh->b_page);
+	desc_kaddr = kmap_thread(req->pr_desc_bh->b_page);
 	desc = nilfs_palloc_block_get_group_desc(inode, group,
 						 req->pr_desc_bh, desc_kaddr);
-	bitmap_kaddr = kmap(req->pr_bitmap_bh->b_page);
+	bitmap_kaddr = kmap_thread(req->pr_bitmap_bh->b_page);
 	bitmap = bitmap_kaddr + bh_offset(req->pr_bitmap_bh);
 	lock = nilfs_mdt_bgl_lock(inode, group);
 
@@ -661,8 +661,8 @@ void nilfs_palloc_abort_alloc_entry(struct inode *inode,
 	else
 		nilfs_palloc_group_desc_add_entries(desc, lock, 1);
 
-	kunmap(req->pr_bitmap_bh->b_page);
-	kunmap(req->pr_desc_bh->b_page);
+	kunmap_thread(req->pr_bitmap_bh->b_page);
+	kunmap_thread(req->pr_desc_bh->b_page);
 
 	brelse(req->pr_bitmap_bh);
 	brelse(req->pr_desc_bh);
@@ -754,7 +754,7 @@ int nilfs_palloc_freev(struct inode *inode, __u64 *entry_nrs, size_t nitems)
 		/* Get the first entry number of the group */
 		group_min_nr = (__u64)group * epg;
 
-		bitmap_kaddr = kmap(bitmap_bh->b_page);
+		bitmap_kaddr = kmap_thread(bitmap_bh->b_page);
 		bitmap = bitmap_kaddr + bh_offset(bitmap_bh);
 		lock = nilfs_mdt_bgl_lock(inode, group);
 
@@ -800,7 +800,7 @@ int nilfs_palloc_freev(struct inode *inode, __u64 *entry_nrs, size_t nitems)
 			entry_start = rounddown(group_offset, epb);
 		} while (true);
 
-		kunmap(bitmap_bh->b_page);
+		kunmap_thread(bitmap_bh->b_page);
 		mark_buffer_dirty(bitmap_bh);
 		brelse(bitmap_bh);
 
diff --git a/fs/nilfs2/cpfile.c b/fs/nilfs2/cpfile.c
index 86d4d850d130..402ab8bfce29 100644
--- a/fs/nilfs2/cpfile.c
+++ b/fs/nilfs2/cpfile.c
@@ -235,11 +235,11 @@ int nilfs_cpfile_get_checkpoint(struct inode *cpfile,
 	ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, create, &cp_bh);
 	if (ret < 0)
 		goto out_header;
-	kaddr = kmap(cp_bh->b_page);
+	kaddr = kmap_thread(cp_bh->b_page);
 	cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
 	if (nilfs_checkpoint_invalid(cp)) {
 		if (!create) {
-			kunmap(cp_bh->b_page);
+			kunmap_thread(cp_bh->b_page);
 			brelse(cp_bh);
 			ret = -ENOENT;
 			goto out_header;
-- 
2.28.0.rc0.12.gb6a658bd00c9