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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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fs/jffs2/nodelist.c
+33 -18
View File
@@ -953,13 +953,19 @@ void jffs2_free_raw_node_refs(struct jffs2_sb_info *c)
for (i=0; i<c->nr_blocks; i++) {
this = c->blocks[i].first_node;
while(this) {
while (this) {
next = this->next_phys;
jffs2_free_raw_node_ref(this);
__jffs2_free_raw_node_ref(this);
this = next;
}
c->blocks[i].first_node = c->blocks[i].last_node = NULL;
}
this = c->refs;
while (this) {
next = this->next_in_ino;
__jffs2_free_raw_node_ref(this);
this = next;
}
}
struct jffs2_node_frag *jffs2_lookup_node_frag(struct rb_root *fragtree, uint32_t offset)
@@ -1047,10 +1053,27 @@ void jffs2_kill_fragtree(struct rb_root *root, struct jffs2_sb_info *c)
}
}
void jffs2_link_node_ref(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
struct jffs2_raw_node_ref *ref, uint32_t len,
struct jffs2_inode_cache *ic)
struct jffs2_raw_node_ref *jffs2_link_node_ref(struct jffs2_sb_info *c,
struct jffs2_eraseblock *jeb,
uint32_t ofs, uint32_t len,
struct jffs2_inode_cache *ic)
{
struct jffs2_raw_node_ref *ref;
/* These will be preallocated _very_ shortly. */
ref = c->refs;
if (!c->refs) {
JFFS2_WARNING("Using non-preallocated refs!\n");
ref = __jffs2_alloc_raw_node_ref();
BUG_ON(!ref);
WARN_ON(1);
} else {
c->refs = ref->next_in_ino;
}
ref->next_phys = NULL;
ref->flash_offset = ofs;
if (!jeb->first_node)
jeb->first_node = ref;
if (jeb->last_node) {
@@ -1093,15 +1116,15 @@ void jffs2_link_node_ref(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
c->free_size -= len;
jeb->free_size -= len;
ref->next_phys = NULL;
#ifdef TEST_TOTLEN
/* Set (and test) __totlen field... for now */
ref->__totlen = len;
ref_totlen(c, jeb, ref);
#endif
return ref;
}
/* No locking. Do not use on a live file system */
/* No locking, no reservation of 'ref'. Do not use on a live file system */
int jffs2_scan_dirty_space(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
uint32_t size)
{
@@ -1121,18 +1144,10 @@ int jffs2_scan_dirty_space(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb
jeb->dirty_size += size;
jeb->free_size -= size;
} else {
struct jffs2_raw_node_ref *ref;
ref = jffs2_alloc_raw_node_ref();
if (!ref)
return -ENOMEM;
uint32_t ofs = jeb->offset + c->sector_size - jeb->free_size;
ofs |= REF_OBSOLETE;
ref->flash_offset = jeb->offset + c->sector_size - jeb->free_size;
ref->flash_offset |= REF_OBSOLETE;
#ifdef TEST_TOTLEN
ref->__totlen = size;
#endif
jffs2_link_node_ref(c, jeb, ref, size, NULL);
jffs2_link_node_ref(c, jeb, ofs, size, NULL);
}
return 0;