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[JFFS2] Finally eliminate __totlen field from struct jffs2_raw_node_ref

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Well, almost. We'll actually keep a 'TEST_TOTLEN' macro set for now, and keep
doing some paranoia checks to make sure it's all working correctly. But if
TEST_TOTLEN is unset, the size of struct jffs2_raw_node_ref drops from 16
bytes to 12 on 32-bit machines. That's a saving of about half a megabyte of
memory on the OLPC prototype board, with 125K or so nodes in its 512MiB of
flash.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
此提交包含在：
David Woodhouse
2006-05-21 13:29:11 +01:00
父節點 010b06d6d0
當前提交 ca89a517fa
共有 3 個檔案被更改，包括 121 行新增 和 58 行删除
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58
fs/jffs2/nodelist.h
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@@ -82,7 +82,10 @@ struct jffs2_raw_node_ref
word so you know when you've got there :) */
struct jffs2_raw_node_ref *next_phys;
uint32_t flash_offset;
#define TEST_TOTLEN
#ifdef TEST_TOTLEN
uint32_t __totlen; /* This may die; use ref_totlen(c, jeb, ) below */
#endif
};
/* flash_offset & 3 always has to be zero, because nodes are
@@ -221,57 +224,7 @@ static inline int jffs2_blocks_use_vmalloc(struct jffs2_sb_info *c)
return ((c->flash_size / c->sector_size) * sizeof (struct jffs2_eraseblock)) > (128 * 1024);
}
/* Calculate totlen from surrounding nodes or eraseblock */
static inline uint32_t __ref_totlen(struct jffs2_sb_info *c,
struct jffs2_eraseblock *jeb,
struct jffs2_raw_node_ref *ref)
{
uint32_t ref_end;
if (ref->next_phys)
ref_end = ref_offset(ref->next_phys);
else {
if (!jeb)
jeb = &c->blocks[ref->flash_offset / c->sector_size];
/* Last node in block. Use free_space */
BUG_ON(ref != jeb->last_node);
ref_end = jeb->offset + c->sector_size - jeb->free_size;
}
return ref_end - ref_offset(ref);
}
static inline uint32_t ref_totlen(struct jffs2_sb_info *c,
struct jffs2_eraseblock *jeb,
struct jffs2_raw_node_ref *ref)
{
uint32_t ret;
#if CONFIG_JFFS2_FS_DEBUG > 0
if (jeb && jeb != &c->blocks[ref->flash_offset / c->sector_size]) {
printk(KERN_CRIT "ref_totlen called with wrong block -- at 0x%08x instead of 0x%08x; ref 0x%08x\n",
jeb->offset, c->blocks[ref->flash_offset / c->sector_size].offset, ref_offset(ref));
BUG();
}
#endif
#if 1
ret = ref->__totlen;
#else
/* This doesn't actually work yet */
ret = __ref_totlen(c, jeb, ref);
if (ret != ref->__totlen) {
printk(KERN_CRIT "Totlen for ref at %p (0x%08x-0x%08x) miscalculated as 0x%x instead of %x\n",
ref, ref_offset(ref), ref_offset(ref)+ref->__totlen,
ret, ref->__totlen);
if (!jeb)
jeb = &c->blocks[ref->flash_offset / c->sector_size];
jffs2_dbg_dump_node_refs_nolock(c, jeb);
BUG();
}
#endif
return ret;
}
#define ref_totlen(a, b, c) __jffs2_ref_totlen((a), (b), (c))
#define ALLOC_NORMAL 0 /* Normal allocation */
#define ALLOC_DELETION 1 /* Deletion node. Best to allow it */
@@ -355,6 +308,9 @@ void jffs2_truncate_fragtree (struct jffs2_sb_info *c, struct rb_root *list, uin
int jffs2_add_older_frag_to_fragtree(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_tmp_dnode_info *tn);
void jffs2_link_node_ref(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
struct jffs2_raw_node_ref *ref, uint32_t len);
extern uint32_t __jffs2_ref_totlen(struct jffs2_sb_info *c,
struct jffs2_eraseblock *jeb,
struct jffs2_raw_node_ref *ref);
/* nodemgmt.c */
int jffs2_thread_should_wake(struct jffs2_sb_info *c);