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| author | David Sterba <dsterba@suse.com> | 2016-11-09 19:43:38 +0300 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2016-11-30 15:45:17 +0300 |
| commit | f157bf765b3773efb5e981dea286cd311fca3b59 (patch) | |
| tree | ac59008400086c6c7f5a8f205ad3e9da14659fe0 | |
| parent | 2230adffe4eae30ffce605daa81a116cb71b5960 (diff) | |
| download | linux-f157bf765b3773efb5e981dea286cd311fca3b59.tar.xz | |
btrfs: introduce helpers for updating eb uuids
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@suse.com>
| -rw-r--r-- | fs/btrfs/extent_io.c | 21 | ||||
| -rw-r--r-- | fs/btrfs/extent_io.h | 3 |
2 files changed, 24 insertions, 0 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index ea9ade703da2..2ae731a0058a 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, |