From: Gao Xiang <xiang@kernel.org>
To: linux-erofs@lists.ozlabs.org, Chao Yu <yuchao0@huawei.com>,
Chao Yu <chao@kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH v2 05/10] erofs: add big physical cluster definition
Date: Thu, 1 Apr 2021 11:29:49 +0800 [thread overview]
Message-ID: <20210401032954.20555-6-xiang@kernel.org> (raw)
In-Reply-To: <20210401032954.20555-1-xiang@kernel.org>
From: Gao Xiang <hsiangkao@redhat.com>
Big pcluster indicates the size of compressed data for each physical
pcluster is no longer fixed as block size, but could be more than 1
block (more accurately, 1 logical pcluster)
When big pcluster feature is enabled for head0/1, delta0 of the 1st
non-head lcluster index will keep block count of this pcluster in
lcluster size instead of 1. Or, the compressed size of pcluster
should be 1 lcluster if pcluster has no non-head lcluster index.
Also note that BIG_PCLUSTER feature reuses COMPR_CFGS feature since
it depends on COMPR_CFGS and will be released together.
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
---
fs/erofs/erofs_fs.h | 19 +++++++++++++++----
fs/erofs/internal.h | 1 +
2 files changed, 16 insertions(+), 4 deletions(-)
diff --git a/fs/erofs/erofs_fs.h b/fs/erofs/erofs_fs.h
index 76777673eb63..ecc3a0ea0bc4 100644
--- a/fs/erofs/erofs_fs.h
+++ b/fs/erofs/erofs_fs.h
@@ -19,6 +19,7 @@
*/
#define EROFS_FEATURE_INCOMPAT_LZ4_0PADDING 0x00000001
#define EROFS_FEATURE_INCOMPAT_COMPR_CFGS 0x00000002
+#define EROFS_FEATURE_INCOMPAT_BIG_PCLUSTER 0x00000002
#define EROFS_ALL_FEATURE_INCOMPAT EROFS_FEATURE_INCOMPAT_LZ4_0PADDING
#define EROFS_SB_EXTSLOT_SIZE 16
@@ -214,17 +215,20 @@ enum {
/* 14 bytes (+ length field = 16 bytes) */
struct z_erofs_lz4_cfgs {
__le16 max_distance;
- u8 reserved[12];
+ __le16 max_pclusterblks;
+ u8 reserved[10];
} __packed;
/*
* bit 0 : COMPACTED_2B indexes (0 - off; 1 - on)
* e.g. for 4k logical cluster size, 4B if compacted 2B is off;
* (4B) + 2B + (4B) if compacted 2B is on.
+ * bit 1 : HEAD1 big pcluster (0 - off; 1 - on)
+ * bit 2 : HEAD2 big pcluster (0 - off; 1 - on)
*/
-#define Z_EROFS_ADVISE_COMPACTED_2B_BIT 0
-
-#define Z_EROFS_ADVISE_COMPACTED_2B (1 << Z_EROFS_ADVISE_COMPACTED_2B_BIT)
+#define Z_EROFS_ADVISE_COMPACTED_2B 0x0001
+#define Z_EROFS_ADVISE_BIG_PCLUSTER_1 0x0002
+#define Z_EROFS_ADVISE_BIG_PCLUSTER_2 0x0004
struct z_erofs_map_header {
__le32 h_reserved1;
@@ -279,6 +283,13 @@ enum {
#define Z_EROFS_VLE_DI_CLUSTER_TYPE_BITS 2
#define Z_EROFS_VLE_DI_CLUSTER_TYPE_BIT 0
+/*
+ * D0_CBLKCNT will be marked _only_ at the 1st non-head lcluster to store the
+ * compressed block count of a compressed extent (in logical clusters, aka.
+ * block count of a pcluster).
+ */
+#define Z_EROFS_VLE_DI_D0_CBLKCNT (1 << 11)
+
struct z_erofs_vle_decompressed_index {
__le16 di_advise;
/* where to decompress in the head cluster */
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index 06c294929069..c4b3938a7e56 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -230,6 +230,7 @@ static inline bool erofs_sb_has_##name(struct erofs_sb_info *sbi) \
EROFS_FEATURE_FUNCS(lz4_0padding, incompat, INCOMPAT_LZ4_0PADDING)
EROFS_FEATURE_FUNCS(compr_cfgs, incompat, INCOMPAT_COMPR_CFGS)
+EROFS_FEATURE_FUNCS(big_pcluster, incompat, INCOMPAT_BIG_PCLUSTER)
EROFS_FEATURE_FUNCS(sb_chksum, compat, COMPAT_SB_CHKSUM)
/* atomic flag definitions */
--
2.20.1
next prev parent reply other threads:[~2021-04-01 3:30 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-01 3:29 [PATCH v2 00/10] erofs: add big pcluster compression support Gao Xiang
2021-04-01 3:29 ` [PATCH v2 01/10] erofs: reserve physical_clusterbits[] Gao Xiang
2021-04-01 3:29 ` [PATCH v2 02/10] erofs: introduce multipage per-CPU buffers Gao Xiang
2021-04-01 3:29 ` [PATCH v2 03/10] erofs: introduce physical cluster slab pools Gao Xiang
2021-04-01 3:29 ` [PATCH v2 04/10] erofs: fix up inplace I/O pointer for big pcluster Gao Xiang
2021-04-01 3:29 ` Gao Xiang [this message]
2021-04-01 3:29 ` [PATCH v2 06/10] erofs: adjust per-CPU buffers according to max_pclusterblks Gao Xiang
2021-04-01 3:29 ` [PATCH v2 07/10] erofs: support parsing big pcluster compress indexes Gao Xiang
2021-04-01 3:29 ` [PATCH v2 08/10] erofs: support parsing big pcluster compact indexes Gao Xiang
2021-04-01 3:29 ` [PATCH v2 09/10] erofs: support decompress big pcluster for lz4 backend Gao Xiang
2021-04-01 3:29 ` [PATCH v2 10/10] erofs: enable big pcluster feature Gao Xiang
2021-04-03 3:17 ` [PATCH v2 00/10] erofs: add big pcluster compression support Gao Xiang
2021-04-03 3:52 ` Chao Yu
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