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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-07-26 23:07:41 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-07-28 16:33:57 +0200
commitcce36f459ddb5698fd1a40061c466996482146eb (patch)
tree05037e8f8d18c850a2f8afeac427e3dcada717dc /include/data_writer.h
parente480a7459377817fbab7029a7dad47c969b8dd97 (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.h13
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 */