erofs: move zdata.h into zdata.c

Definitions in zdata.h are only used in zdata.c and for internal
use only.  No logic changes.

Reviewed-by: Yue Hu <huyue2@coolpad.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20230204093040.97967-4-hsiangkao@linux.alibaba.com

1 files changed, 165 insertions, 1 deletions

diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index ae97e3b627cb..384f64292f73 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -4,13 +4,177 @@
  *             https://www.huawei.com/
  * Copyright (C) 2022 Alibaba Cloud
  */
-#include "zdata.h"
 #include "compress.h"
 #include <linux/prefetch.h>
 #include <linux/psi.h>
 
 #include <trace/events/erofs.h>
 
+#define Z_EROFS_PCLUSTER_MAX_PAGES	(Z_EROFS_PCLUSTER_MAX_SIZE / PAGE_SIZE)
+#define Z_EROFS_INLINE_BVECS		2
+
+/*
+ * let's leave a type here in case of introducing
+ * another tagged pointer later.
+ */
+typedef void *z_erofs_next_pcluster_t;
+
+struct z_erofs_bvec {
+	struct page *page;
+	int offset;
+	unsigned int end;
+};
+
+#define __Z_EROFS_BVSET(name, total) \
+struct name { \
+	/* point to the next page which contains the following bvecs */ \
+	struct page *nextpage; \
+	struct z_erofs_bvec bvec[total]; \
+}
+__Z_EROFS_BVSET(z_erofs_bvset,);
+__Z_EROFS_BVSET(z_erofs_bvset_inline, Z_EROFS_INLINE_BVECS);
+
+/*
+ * Structure fields follow one of the following exclusion rules.
+ *
+ * I: Modifiable by initialization/destruction paths and read-only
+ *    for everyone else;
+ *
+ * L: Field should be protected by the pcluster lock;
+ *
+ * A: Field should be accessed / updated in atomic for parallelized code.
+ */
+struct z_erofs_pcluster {
+	struct erofs_workgroup obj;
+	struct mutex lock;
+
+	/* A: point to next chained pcluster or TAILs */
+	z_erofs_next_pcluster_t next;
+
+	/* L: the maximum decompression size of this round */
+	unsigned int length;
+
+	/* L: total number of bvecs */
+	unsigned int vcnt;
+
+	/* I: page offset of start position of decompression */
+	unsigned short pageofs_out;
+
+	/* I: page offset of inline compressed data */
+	unsigned short pageofs_in;
+
+	union {
+		/* L: inline a certain number of bvec for bootstrap */
+		struct z_erofs_bvset_inline bvset;
+
+		/* I: can be used to free the pcluster by RCU. */
+		struct rcu_head rcu;
+	};
+
+	union {
+		/* I: physical cluster size in pages */
+		unsigned short pclusterpages;
+
+		/* I: tailpacking inline compressed size */
+		unsigned short tailpacking_size;
+	};
+
+	/* I: compression algorithm format */
+	unsigned char algorithmformat;
+
+	/* L: whether partial decompression or not */
+	bool partial;
+
+	/* L: indicate several pageofs_outs or not */
+	bool multibases;
+
+	/* A: compressed bvecs (can be cached or inplaced pages) */
+	struct z_erofs_bvec compressed_bvecs[];
+};
+
+/* let's avoid the valid 32-bit kernel addresses */
+
+/* the chained workgroup has't submitted io (still open) */
+#define Z_EROFS_PCLUSTER_TAIL           ((void *)0x5F0ECAFE)
+/* the chained workgroup has already submitted io */
+#define Z_EROFS_PCLUSTER_TAIL_CLOSED    ((void *)0x5F0EDEAD)
+
+#define Z_EROFS_PCLUSTER_NIL            (NULL)
+
+struct z_erofs_decompressqueue {
+	struct super_block *sb;
+	atomic_t pending_bios;
+	z_erofs_next_pcluster_t head;
+
+	union {
+		struct completion done;
+		struct work_struct work;
+	} u;
+	bool eio, sync;
+};
+
+static inline bool z_erofs_is_inline_pcluster(struct z_erofs_pcluster *pcl)
+{
+	return !pcl->obj.index;
+}
+
+static inline unsigned int z_erofs_pclusterpages(struct z_erofs_pcluster *pcl)
+{
+	if (z_erofs_is_inline_pcluster(pcl))
+		return 1;
+	return pcl->pclusterpages;
+}
+
+/*
+ * bit 30: I/O error occurred on this page
+ * bit 0 - 29: remaining parts to complete this page
+ */
+#define Z_EROFS_PAGE_EIO			(1 << 30)
+
+static inline void z_erofs_onlinepage_init(struct page *page)
+{
+	union {
+		atomic_t o;
+		unsigned long v;
+	} u = { .o = ATOMIC_INIT(1) };
+
+	set_page_private(page, u.v);
+	smp_wmb();
+	SetPagePrivate(page);
+}
+
+static inline void z_erofs_onlinepage_split(struct page *page)
+{
+	atomic_inc((atomic_t *)&page->private);
+}
+
+static inline void z_erofs_page_mark_eio(struct page *page)
+{
+	int orig;
+
+	do {
+		orig = atomic_read((atomic_t *)&page->private);
+	} while (atomic_cmpxchg((atomic_t *)&page->private, orig,
+				orig | Z_EROFS_PAGE_EIO) != orig);
+}
+
+static inline void z_erofs_onlinepage_endio(struct page *page)
+{
+	unsigned int v;
+
+	DBG_BUGON(!PagePrivate(page));
+	v = atomic_dec_return((atomic_t *)&page->private);
+	if (!(v & ~Z_EROFS_PAGE_EIO)) {
+		set_page_private(page, 0);
+		ClearPagePrivate(page);
+		if (!(v & Z_EROFS_PAGE_EIO))
+			SetPageUptodate(page);
+		unlock_page(page);
+	}
+}
+
+#define Z_EROFS_ONSTACK_PAGES		32
+
 /*
  * since pclustersize is variable for big pcluster feature, introduce slab
  * pools implementation for different pcluster sizes.