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[JFFS2] Reduce visibility of raw_node_ref to upper layers of JFFS2 code.

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As the first step towards eliminating the ref->next_phys member and saving
memory by using an _array_ of struct jffs2_raw_node_ref per eraseblock,
stop the write functions from allocating their own refs; have them just
_reserve_ the appropriate number instead. Then jffs2_link_node_ref() can
just fill them in.

Use a linked list of pre-allocated refs in the superblock, for now. Once
we switch to an array, it'll just be a case of extending that array.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
David Woodhouse
2006-05-24 02:04:45 +01:00
parent 4cbb9b80e1
commit 2f785402f3
12 changed files with 205 additions and 350 deletions
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26
fs/jffs2/malloc.c
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@@ -190,7 +190,29 @@ void jffs2_free_tmp_dnode_info(struct jffs2_tmp_dnode_info *x)
kmem_cache_free(tmp_dnode_info_slab, x);
}
struct jffs2_raw_node_ref *jffs2_alloc_raw_node_ref(void)
int jffs2_prealloc_raw_node_refs(struct jffs2_sb_info *c, int nr)
{
struct jffs2_raw_node_ref *p = c->refs;
dbg_memalloc("%d\n", nr);
while (nr && p) {
p = p->next_in_ino;
nr--;
}
while (nr) {
p = __jffs2_alloc_raw_node_ref();
if (!p)
return -ENOMEM;
p->next_in_ino = c->refs;
c->refs = p;
nr--;
}
c->reserved_refs = nr;
return 0;
}
struct jffs2_raw_node_ref *__jffs2_alloc_raw_node_ref(void)
{
struct jffs2_raw_node_ref *ret;
ret = kmem_cache_alloc(raw_node_ref_slab, GFP_KERNEL);
@@ -198,7 +220,7 @@ struct jffs2_raw_node_ref *jffs2_alloc_raw_node_ref(void)
return ret;
}
void jffs2_free_raw_node_ref(struct jffs2_raw_node_ref *x)
void __jffs2_free_raw_node_ref(struct jffs2_raw_node_ref *x)
{
dbg_memalloc("%p\n", x);
kmem_cache_free(raw_node_ref_slab, x);