staging: erofs: separate erofs_get_meta_page

This patch separates 'erofs_get_meta_page' into 'erofs_get_meta_page'
and 'erofs_get_meta_page_nofail'. The second one ensures that it
should not fail under memory pressure and should make best efforts
if IO errors occur.

It also adds auxiliary variables in order to fulfill 80 character limit.

Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 14 insertions, 9 deletions

diff --git a/drivers/staging/erofs/xattr.c b/drivers/staging/erofs/xattr.c
index 0e9cfeccdf99..2593c856b079 100644
--- a/drivers/staging/erofs/xattr.c
+++ b/drivers/staging/erofs/xattr.c
@@ -38,6 +38,7 @@ static void init_inode_xattrs(struct inode *inode)
 	struct xattr_iter it;
 	unsigned i;
 	struct erofs_xattr_ibody_header *ih;
+	struct super_block *sb;
 	struct erofs_sb_info *sbi;
 	struct erofs_vnode *vi;
 	bool atomic_map;
@@ -48,11 +49,12 @@ static void init_inode_xattrs(struct inode *inode)
 	vi = EROFS_V(inode);
 	BUG_ON(!vi->xattr_isize);
 
-	sbi = EROFS_I_SB(inode);
+	sb = inode->i_sb;
+	sbi = EROFS_SB(sb);
 	it.blkaddr = erofs_blknr(iloc(sbi, vi->nid) + vi->inode_isize);
 	it.ofs = erofs_blkoff(iloc(sbi, vi->nid) + vi->inode_isize);
 
-	it.page = erofs_get_inline_page(inode, it.blkaddr);
+	it.page = erofs_get_inline_page_nofail(inode, it.blkaddr);
 	BUG_ON(IS_ERR(it.page));
 
 	/* read in shared xattr array (non-atomic, see kmalloc below) */
@@ -75,7 +77,7 @@ static void init_inode_xattrs(struct inode *inode)
 			BUG_ON(it.ofs != EROFS_BLKSIZ);
 			xattr_iter_end(&it, atomic_map);
 
-			it.page = erofs_get_meta_page(inode->i_sb,
+			it.page = erofs_get_meta_page_nofail(sb,
 				++it.blkaddr, S_ISDIR(inode->i_mode));
 			BUG_ON(IS_ERR(it.page));
 
@@ -105,7 +107,8 @@ static void xattr_iter_fixup(struct xattr_iter *it)
 		xattr_iter_end(it, true);
 
 		it->blkaddr += erofs_blknr(it->ofs);
-		it->page = erofs_get_meta_page(it->sb, it->blkaddr, false);
+		it->page = erofs_get_meta_page_nofail(it->sb,
+			it->blkaddr, false);
 		BUG_ON(IS_ERR(it->page));
 
 		it->kaddr = kmap_atomic(it->page);
@@ -131,7 +134,7 @@ static int inline_xattr_iter_begin(struct xattr_iter *it,
 	it->blkaddr = erofs_blknr(iloc(sbi, vi->nid) + inline_xattr_ofs);
 	it->ofs = erofs_blkoff(iloc(sbi, vi->nid) + inline_xattr_ofs);
 
-	it->page = erofs_get_inline_page(inode, it->blkaddr);
+	it->page = erofs_get_inline_page_nofail(inode, it->blkaddr);
 	BUG_ON(IS_ERR(it->page));
 	it->kaddr = kmap_atomic(it->page);
 
@@ -300,7 +303,8 @@ static int inline_getxattr(struct inode *inode, struct getxattr_iter *it)
 static int shared_getxattr(struct inode *inode, struct getxattr_iter *it)
 {
 	struct erofs_vnode *const vi = EROFS_V(inode);
-	struct erofs_sb_info *const sbi = EROFS_SB(inode->i_sb);
+	struct super_block *const sb = inode->i_sb;
+	struct erofs_sb_info *const sbi = EROFS_SB(sb);
 	unsigned i;
 	int ret = -ENOATTR;
 
@@ -314,7 +318,7 @@ static int shared_getxattr(struct inode *inode, struct getxattr_iter *it)
 			if (i)
 				xattr_iter_end(&it->it, true);
 
-			it->it.page = erofs_get_meta_page(inode->i_sb,
+			it->it.page = erofs_get_meta_page_nofail(sb,
 				blkaddr, false);
 			BUG_ON(IS_ERR(it->it.page));
 			it->it.kaddr = kmap_atomic(it->it.page);
@@ -524,7 +528,8 @@ static int shared_listxattr(struct listxattr_iter *it)
 {
 	struct inode *const inode = d_inode(it->dentry);
 	struct erofs_vnode *const vi = EROFS_V(inode);
-	struct erofs_sb_info *const sbi = EROFS_I_SB(inode);
+	struct super_block *const sb = inode->i_sb;
+	struct erofs_sb_info *const sbi = EROFS_SB(sb);
 	unsigned i;
 	int ret = 0;
 
@@ -537,7 +542,7 @@ static int shared_listxattr(struct listxattr_iter *it)
 			if (i)
 				xattr_iter_end(&it->it, true);
 
-			it->it.page = erofs_get_meta_page(inode->i_sb,
+			it->it.page = erofs_get_meta_page_nofail(sb,
 				blkaddr, false);
 			BUG_ON(IS_ERR(it->it.page));
 			it->it.kaddr = kmap_atomic(it->it.page);