On 04/01/2016 02:35 AM, Qu Wenruo wrote:
Now on-disk backend can add hash now.
Since all needed on-disk backend functions are added, also allow on-disk
backend to be used, by changing DEDUPE_BACKEND_COUNT from 1(inmemory
only) to 2 (inmemory + ondisk).
Signed-off-by: Wang Xiaoguang <wangxg.fnst@xxxxxxxxxxxxxx>
Signed-off-by: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx>
---
fs/btrfs/dedupe.c | 83 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/btrfs/dedupe.h | 3 +-
2 files changed, 84 insertions(+), 2 deletions(-)
diff --git a/fs/btrfs/dedupe.c b/fs/btrfs/dedupe.c
index 7c5d58a..1f0178e 100644
--- a/fs/btrfs/dedupe.c
+++ b/fs/btrfs/dedupe.c
@@ -437,6 +437,87 @@ out:
return 0;
}
+static int ondisk_search_bytenr(struct btrfs_trans_handle *trans,
+ struct btrfs_dedupe_info *dedupe_info,
+ struct btrfs_path *path, u64 bytenr,
+ int prepare_del);
+static int ondisk_search_hash(struct btrfs_dedupe_info *dedupe_info, u8 *hash,
+ u64 *bytenr_ret, u32 *num_bytes_ret);
+static int ondisk_add(struct btrfs_trans_handle *trans,
+ struct btrfs_dedupe_info *dedupe_info,
+ struct btrfs_dedupe_hash *hash)
+{
+ struct btrfs_path *path;
+ struct btrfs_root *dedupe_root = dedupe_info->dedupe_root;
+ struct btrfs_key key;
+ u64 hash_offset;
+ u64 bytenr;
+ u32 num_bytes;
+ int hash_len = btrfs_dedupe_sizes[dedupe_info->hash_type];
+ int ret;
+
+ if (WARN_ON(hash_len <= 8 ||
+ !IS_ALIGNED(hash->bytenr, dedupe_root->sectorsize)))
+ return -EINVAL;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ mutex_lock(&dedupe_info->lock);
+
+ ret = ondisk_search_bytenr(NULL, dedupe_info, path, hash->bytenr, 0);
+ if (ret < 0)
+ goto out;
+ if (ret > 0) {
+ ret = 0;
+ goto out;
+ }
+ btrfs_release_path(path);
+
+ ret = ondisk_search_hash(dedupe_info, hash->hash, &bytenr, &num_bytes);
+ if (ret < 0)
+ goto out;
+ /* Same hash found, don't re-add to save dedupe tree space */
+ if (ret > 0) {
+ ret = 0;
+ goto out;
+ }
+
+ /* Insert hash->bytenr item */
+ memcpy(&key.objectid, hash->hash + hash_len - 8, 8);
No magic numbers please. Thanks,
Josef
--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
