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| author | David Sterba | 2016-11-09 17:43:38 +0100 |
|---|---|---|
| committer | David Sterba | 2016-11-30 13:45:17 +0100 |
| commit | f157bf765b3773efb5e981dea286cd311fca3b59 (patch) | |
| tree | ac59008400086c6c7f5a8f205ad3e9da14659fe0 /fs/btrfs/extent_io.c | |
| parent | btrfs: delete unused member from superblock (diff) | |
| download | kernel-qcow2-linux-f157bf765b3773efb5e981dea286cd311fca3b59.tar.gz kernel-qcow2-linux-f157bf765b3773efb5e981dea286cd311fca3b59.tar.xz kernel-qcow2-linux-f157bf765b3773efb5e981dea286cd311fca3b59.zip | |
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>
Diffstat (limited to 'fs/btrfs/extent_io.c')
| -rw-r--r-- | fs/btrfs/extent_io.c | 21 |
1 files changed, 21 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) { |