diff options
| author | David Oberhollenzer <david.oberhollenzer@sigma-star.at> | 2019-07-26 23:07:41 +0200 |
|---|---|---|
| committer | David Oberhollenzer <david.oberhollenzer@sigma-star.at> | 2019-07-28 16:33:57 +0200 |
| commit | cce36f459ddb5698fd1a40061c466996482146eb (patch) | |
| tree | 05037e8f8d18c850a2f8afeac427e3dcada717dc /include/data_writer.h | |
| parent | e480a7459377817fbab7029a7dad47c969b8dd97 (diff) | |
Implement fragment deduplication in data writer
The strategy is simple:
- The data writer function that write data/fragment blocks get
access to the list files.
- When writing a fragment, we look for an already written file that has
a fragment with the same size and checksum.
- If we find one, we throw away the fragment and reuse the existing one.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'include/data_writer.h')
| -rw-r--r-- | include/data_writer.h | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/include/data_writer.h b/include/data_writer.h index 7107868..f5ad572 100644 --- a/include/data_writer.h +++ b/include/data_writer.h @@ -66,10 +66,14 @@ int data_writer_flush_fragments(data_writer_t *data); The flags argument is a combination of DW_* flags. + If 'list' is not NULL, it is used for fragment and data block deduplication. + It is assumed that the list is processed in order and scanning stops as soon + as the current file info 'fi' is encountered in the list. + Returns 0 on success, prints errors to stderr. */ int write_data_from_fd(data_writer_t *data, file_info_t *fi, int infd, - int flags); + int flags, file_info_t *list); /* Does the same as write_data_from_fd but the input file is the condensed @@ -78,9 +82,14 @@ int write_data_from_fd(data_writer_t *data, file_info_t *fi, int infd, The flags argument is a combination of DW_* flags. + If 'list' is not NULL, it is used for fragment and data block deduplication. + It is assumed that the list is processed in order and scanning stops as soon + as the current file info 'fi' is encountered in the list. + Returns 0 on success, prints errors to stderr. */ int write_data_from_fd_condensed(data_writer_t *data, file_info_t *fi, - int infd, sparse_map_t *map, int flags); + int infd, sparse_map_t *map, int flags, + file_info_t *list); #endif /* DATA_WRITER_H */ |