[PATCH] erofs: use kmap_local_page() only for erofs_bread()

From: Gao Xiang
Date: Mon Oct 17 2022 - 23:55:53 EST


Convert all mapped erofs_bread() users to use kmap_local_page()
instead of kmap() or kmap_atomic().

Signed-off-by: Gao Xiang <hsiangkao@xxxxxxxxxxxxxxxxx>
---
fs/erofs/data.c | 8 ++------
fs/erofs/internal.h | 3 +--
fs/erofs/xattr.c | 8 ++++----
fs/erofs/zmap.c | 4 ++--
4 files changed, 9 insertions(+), 14 deletions(-)

diff --git a/fs/erofs/data.c b/fs/erofs/data.c
index fe8ac0e163f7..3873395173b5 100644
--- a/fs/erofs/data.c
+++ b/fs/erofs/data.c
@@ -13,9 +13,7 @@
void erofs_unmap_metabuf(struct erofs_buf *buf)
{
if (buf->kmap_type == EROFS_KMAP)
- kunmap(buf->page);
- else if (buf->kmap_type == EROFS_KMAP_ATOMIC)
- kunmap_atomic(buf->base);
+ kunmap_local(buf->page);
buf->base = NULL;
buf->kmap_type = EROFS_NO_KMAP;
}
@@ -54,9 +52,7 @@ void *erofs_bread(struct erofs_buf *buf, struct inode *inode,
}
if (buf->kmap_type == EROFS_NO_KMAP) {
if (type == EROFS_KMAP)
- buf->base = kmap(page);
- else if (type == EROFS_KMAP_ATOMIC)
- buf->base = kmap_atomic(page);
+ buf->base = kmap_local_page(page);
buf->kmap_type = type;
} else if (buf->kmap_type != type) {
DBG_BUGON(1);
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index 1701df48c446..67dc8e177211 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -253,8 +253,7 @@ static inline int erofs_wait_on_workgroup_freezed(struct erofs_workgroup *grp)

enum erofs_kmap_type {
EROFS_NO_KMAP, /* don't map the buffer */
- EROFS_KMAP, /* use kmap() to map the buffer */
- EROFS_KMAP_ATOMIC, /* use kmap_atomic() to map the buffer */
+ EROFS_KMAP, /* use kmap_local_page() to map the buffer */
};

struct erofs_buf {
diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c
index 8106bcb5a38d..a62fb8a3318a 100644
--- a/fs/erofs/xattr.c
+++ b/fs/erofs/xattr.c
@@ -148,7 +148,7 @@ static inline int xattr_iter_fixup(struct xattr_iter *it)

it->blkaddr += erofs_blknr(it->ofs);
it->kaddr = erofs_read_metabuf(&it->buf, it->sb, it->blkaddr,
- EROFS_KMAP_ATOMIC);
+ EROFS_KMAP);
if (IS_ERR(it->kaddr))
return PTR_ERR(it->kaddr);
it->ofs = erofs_blkoff(it->ofs);
@@ -174,7 +174,7 @@ static int inline_xattr_iter_begin(struct xattr_iter *it,
it->ofs = erofs_blkoff(iloc(sbi, vi->nid) + inline_xattr_ofs);

it->kaddr = erofs_read_metabuf(&it->buf, inode->i_sb, it->blkaddr,
- EROFS_KMAP_ATOMIC);
+ EROFS_KMAP);
if (IS_ERR(it->kaddr))
return PTR_ERR(it->kaddr);
return vi->xattr_isize - xattr_header_sz;
@@ -368,7 +368,7 @@ static int shared_getxattr(struct inode *inode, struct getxattr_iter *it)

it->it.ofs = xattrblock_offset(sbi, vi->xattr_shared_xattrs[i]);
it->it.kaddr = erofs_read_metabuf(&it->it.buf, sb, blkaddr,
- EROFS_KMAP_ATOMIC);
+ EROFS_KMAP);
if (IS_ERR(it->it.kaddr))
return PTR_ERR(it->it.kaddr);
it->it.blkaddr = blkaddr;
@@ -580,7 +580,7 @@ static int shared_listxattr(struct listxattr_iter *it)

it->it.ofs = xattrblock_offset(sbi, vi->xattr_shared_xattrs[i]);
it->it.kaddr = erofs_read_metabuf(&it->it.buf, sb, blkaddr,
- EROFS_KMAP_ATOMIC);
+ EROFS_KMAP);
if (IS_ERR(it->it.kaddr))
return PTR_ERR(it->it.kaddr);
it->it.blkaddr = blkaddr;
diff --git a/fs/erofs/zmap.c b/fs/erofs/zmap.c
index 0bb66927e3d0..749a5ac943f4 100644
--- a/fs/erofs/zmap.c
+++ b/fs/erofs/zmap.c
@@ -178,7 +178,7 @@ static int legacy_load_cluster_from_disk(struct z_erofs_maprecorder *m,
unsigned int advise, type;

m->kaddr = erofs_read_metabuf(&m->map->buf, inode->i_sb,
- erofs_blknr(pos), EROFS_KMAP_ATOMIC);
+ erofs_blknr(pos), EROFS_KMAP);
if (IS_ERR(m->kaddr))
return PTR_ERR(m->kaddr);

@@ -416,7 +416,7 @@ static int compacted_load_cluster_from_disk(struct z_erofs_maprecorder *m,
out:
pos += lcn * (1 << amortizedshift);
m->kaddr = erofs_read_metabuf(&m->map->buf, inode->i_sb,
- erofs_blknr(pos), EROFS_KMAP_ATOMIC);
+ erofs_blknr(pos), EROFS_KMAP);
if (IS_ERR(m->kaddr))
return PTR_ERR(m->kaddr);
return unpack_compacted_index(m, amortizedshift, pos, lookahead);
--
2.24.4