diff options
| author | Gao Xiang <gaoxiang25@huawei.com> | 2019-06-24 15:22:51 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-06-26 09:44:39 +0800 |
| commit | ec8c24420501d4cf3ed495c4d026984194897276 (patch) | |
| tree | 9ecde9f14e9b774cd311059f78e710afe756b816 /drivers/staging/erofs/data.c | |
| parent | e36472145aa706c186a6bb4f6419c613b0b1305c (diff) | |
staging: erofs: add compacted ondisk compression indexes
This patch introduces new compacted compression indexes.
In contract to legacy compression indexes that
each 4k logical cluster has an 8-byte index,
compacted ondisk compression indexes will have
amortized 2 bytes for each 4k logical cluster (compacted 2B)
amortized 4 bytes for each 4k logical cluster (compacted 4B)
In detail, several continuous clusters will be encoded in
a compacted pack with cluster types, offsets, and one blkaddr
at the end of the pack to leave 4-byte margin for better
decoding performance, as illustrated below:
_____________________________________________
|___@_____ encoded bits __________|_ blkaddr _|
0 . amortized * vcnt
. .
. . amortized * vcnt - 4
. .
.___________________.
|_type_|_clusterofs_|
Note that compacted 2 / 4B should be aligned with 32 / 8 bytes
in order to avoid each pack crossing page boundary.
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/erofs/data.c')
| -rw-r--r-- | drivers/staging/erofs/data.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/staging/erofs/data.c b/drivers/staging/erofs/data.c index 746685f90564..cc31c3e5984c 100644 --- a/drivers/staging/erofs/data.c +++ b/drivers/staging/erofs/data.c @@ -124,7 +124,7 @@ static int erofs_map_blocks_flatmode(struct inode *inode, trace_erofs_map_blocks_flatmode_enter(inode, map, flags); nblocks = DIV_ROUND_UP(inode->i_size, PAGE_SIZE); - lastblk = nblocks - is_inode_layout_inline(inode); + lastblk = nblocks - is_inode_flat_inline(inode); if (unlikely(offset >= inode->i_size)) { /* leave out-of-bound access unmapped */ @@ -139,7 +139,7 @@ static int erofs_map_blocks_flatmode(struct inode *inode, if (offset < blknr_to_addr(lastblk)) { map->m_pa = blknr_to_addr(vi->raw_blkaddr) + map->m_la; map->m_plen = blknr_to_addr(lastblk) - offset; - } else if (is_inode_layout_inline(inode)) { + } else if (is_inode_flat_inline(inode)) { /* 2 - inode inline B: inode, [xattrs], inline last blk... */ struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb); |