nilfs2: switch to kmap_local for directory handling

Match ext2 by using kmap_local() instead of kmap().  This is more
efficient.  Also use unmap_and_put_page() instead of duplicating it as a
nilfs function.

[konishi.ryusuke: followed the change of page release helper call sites]
Link: https://lkml.kernel.org/r/20231127143036.2425-9-konishi.ryusuke@gmail.com
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 13 insertions, 14 deletions

diff --git a/fs/nilfs2/dir.c b/fs/nilfs2/dir.c
index 01900e84bddf..89e8a248e571 100644
--- a/fs/nilfs2/dir.c
+++ b/fs/nilfs2/dir.c
@@ -189,7 +189,7 @@ static void *nilfs_get_page(struct inode *dir, unsigned long n,
 	if (IS_ERR(page))
 		return page;
 
-	kaddr = kmap(page);
+	kaddr = kmap_local_page(page);
 	if (unlikely(!PageChecked(page))) {
 		if (!nilfs_check_page(page, kaddr))
 			goto fail;
@@ -199,7 +199,7 @@ static void *nilfs_get_page(struct inode *dir, unsigned long n,
 	return kaddr;
 
 fail:
-	nilfs_put_page(page);
+	unmap_and_put_page(page, kaddr);
 	return ERR_PTR(-EIO);
 }
 
@@ -287,7 +287,7 @@ static int nilfs_readdir(struct file *file, struct dir_context *ctx)
 		for ( ; (char *)de <= limit; de = nilfs_next_entry(de)) {
 			if (de->rec_len == 0) {
 				nilfs_error(sb, "zero-length directory entry");
-				nilfs_put_page(page);
+				unmap_and_put_page(page, kaddr);
 				return -EIO;
 			}
 			if (de->inode) {
@@ -300,13 +300,13 @@ static int nilfs_readdir(struct file *file, struct dir_context *ctx)
 
 				if (!dir_emit(ctx, de->name, de->name_len,
 						le64_to_cpu(de->inode), t)) {
-					nilfs_put_page(page);
+					unmap_and_put_page(page, kaddr);
 					return 0;
 				}
 			}
 			ctx->pos += nilfs_rec_len_from_disk(de->rec_len);
 		}
-		nilfs_put_page(page);
+		unmap_and_put_page(page, kaddr);
 	}
 	return 0;
 }
@@ -352,14 +352,14 @@ nilfs_find_entry(struct inode *dir, const struct qstr *qstr,
 				if (de->rec_len == 0) {
 					nilfs_error(dir->i_sb,
 						"zero-length directory entry");
-					nilfs_put_page(page);
+					unmap_and_put_page(page, kaddr);
 					goto out;
 				}
 				if (nilfs_match(namelen, name, de))
 					goto found;
 				de = nilfs_next_entry(de);
 			}
-			nilfs_put_page(page);
+			unmap_and_put_page(page, kaddr);
 		}
 		if (++n >= npages)
 			n = 0;
@@ -399,8 +399,7 @@ ino_t nilfs_inode_by_name(struct inode *dir, const struct qstr *qstr)
 	de = nilfs_find_entry(dir, qstr, &page);
 	if (de) {
 		res = le64_to_cpu(de->inode);
-		kunmap(page);
-		put_page(page);
+		unmap_and_put_page(page, de);
 	}
 	return res;
 }
@@ -484,7 +483,7 @@ int nilfs_add_link(struct dentry *dentry, struct inode *inode)
 			de = (struct nilfs_dir_entry *)((char *)de + rec_len);
 		}
 		unlock_page(page);
-		nilfs_put_page(page);
+		unmap_and_put_page(page, kaddr);
 	}
 	BUG();
 	return -EINVAL;
@@ -512,7 +511,7 @@ got_it:
 	nilfs_mark_inode_dirty(dir);
 	/* OFFSET_CACHE */
 out_put:
-	nilfs_put_page(page);
+	unmap_and_put_page(page, de);
 out:
 	return err;
 out_unlock:
@@ -609,10 +608,10 @@ fail:
 int nilfs_empty_dir(struct inode *inode)
 {
 	struct page *page = NULL;
+	char *kaddr;
 	unsigned long i, npages = dir_pages(inode);
 
 	for (i = 0; i < npages; i++) {
-		char *kaddr;
 		struct nilfs_dir_entry *de;
 
 		kaddr = nilfs_get_page(inode, i, &page);
@@ -644,12 +643,12 @@ int nilfs_empty_dir(struct inode *inode)
 			}
 			de = nilfs_next_entry(de);
 		}
-		nilfs_put_page(page);
+		unmap_and_put_page(page, kaddr);
 	}
 	return 1;
 
 not_empty:
-	nilfs_put_page(page);
+	unmap_and_put_page(page, kaddr);
 	return 0;
 }