| Message ID | 1459492512-31435-8-git-send-email-quwenruo@cn.fujitsu.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Fri, Apr 01, 2016 at 02:34:58PM +0800, Qu Wenruo wrote: > From: Wang Xiaoguang <wangxg.fnst@cn.fujitsu.com> > > Unlike in-memory or on-disk dedupe method, only SHA256 hash method is > supported yet, so implement btrfs_dedupe_calc_hash() interface using > SHA256. > > Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> > Signed-off-by: Wang Xiaoguang <wangxg.fnst@cn.fujitsu.com> > --- > fs/btrfs/dedupe.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 49 insertions(+) > > diff --git a/fs/btrfs/dedupe.c b/fs/btrfs/dedupe.c > index 9175a5f..bdaea3a 100644 > --- a/fs/btrfs/dedupe.c > +++ b/fs/btrfs/dedupe.c > @@ -593,3 +593,52 @@ int btrfs_dedupe_search(struct btrfs_fs_info *fs_info, > } > return ret; > } > + > +int btrfs_dedupe_calc_hash(struct btrfs_fs_info *fs_info, > + struct inode *inode, u64 start, > + struct btrfs_dedupe_hash *hash) > +{ > + int i; > + int ret; > + struct page *p; > + struct btrfs_dedupe_info *dedupe_info = fs_info->dedupe_info; > + struct crypto_shash *tfm = dedupe_info->dedupe_driver; > + struct { > + struct shash_desc desc; > + char ctx[crypto_shash_descsize(tfm)]; > + } sdesc; This construct has been obsoleted, please use SHASH_DESC_ON_STACK. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/fs/btrfs/dedupe.c b/fs/btrfs/dedupe.c index 9175a5f..bdaea3a 100644 --- a/fs/btrfs/dedupe.c +++ b/fs/btrfs/dedupe.c @@ -593,3 +593,52 @@ int btrfs_dedupe_search(struct btrfs_fs_info *fs_info, } return ret; } + +int btrfs_dedupe_calc_hash(struct btrfs_fs_info *fs_info, + struct inode *inode, u64 start, + struct btrfs_dedupe_hash *hash) +{ + int i; + int ret; + struct page *p; + struct btrfs_dedupe_info *dedupe_info = fs_info->dedupe_info; + struct crypto_shash *tfm = dedupe_info->dedupe_driver; + struct { + struct shash_desc desc; + char ctx[crypto_shash_descsize(tfm)]; + } sdesc; + u64 dedupe_bs; + u64 sectorsize = BTRFS_I(inode)->root->sectorsize; + + if (!fs_info->dedupe_enabled || !hash) + return 0; + + if (WARN_ON(dedupe_info == NULL)) + return -EINVAL; + + WARN_ON(!IS_ALIGNED(start, sectorsize)); + + dedupe_bs = dedupe_info->blocksize; + + sdesc.desc.tfm = tfm; + sdesc.desc.flags = 0; + ret = crypto_shash_init(&sdesc.desc); + if (ret) + return ret; + for (i = 0; sectorsize * i < dedupe_bs; i++) { + char *d; + + p = find_get_page(inode->i_mapping, + (start >> PAGE_CACHE_SHIFT) + i); + if (WARN_ON(!p)) + return -ENOENT; + d = kmap(p); + ret = crypto_shash_update(&sdesc.desc, d, sectorsize); + kunmap(p); + page_cache_release(p); + if (ret) + return ret; + } + ret = crypto_shash_final(&sdesc.desc, hash->hash); + return ret; +}