The fsid and chunk tree uuid are always located in the first page,
we don't need the to use write_extent_buffer.
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
---
fs/btrfs/extent_io.c | 21 +++++++++++++++++++++
fs/btrfs/extent_io.h | 3 +++
2 files changed, 24 insertions(+)
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 8ed05d95584a..45a986791fe0 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -5465,6 +5465,27 @@ int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
return ret;
}
+void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb,
+ const void *srcv)
+{
+ char *kaddr;
+
+ WARN_ON(!PageUptodate(eb->pages[0]));
+ kaddr = page_address(eb->pages[0]);
+ memcpy(kaddr + offsetof(struct btrfs_header, chunk_tree_uuid), srcv,
+ BTRFS_FSID_SIZE);
+}
+
+void write_extent_buffer_fsid(struct extent_buffer *eb, const void *srcv)
+{
+ char *kaddr;
+
+ WARN_ON(!PageUptodate(eb->pages[0]));
+ kaddr = page_address(eb->pages[0]);
+ memcpy(kaddr + offsetof(struct btrfs_header, fsid), srcv,
+ BTRFS_FSID_SIZE);
+}
+
void write_extent_buffer(struct extent_buffer *eb, const void *srcv,
unsigned long start, unsigned long len)
{
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index ab31d145227e..065c77d43921 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -405,6 +405,9 @@ void read_extent_buffer(struct extent_buffer *eb, void *dst,
int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dst,
unsigned long start,
unsigned long len);
+void write_extent_buffer_fsid(struct extent_buffer *eb, const void *src);
+void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb,
+ const void *src);
void write_extent_buffer(struct extent_buffer *eb, const void *src,
unsigned long start, unsigned long len);
void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
--
2.10.1
--
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