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

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>

1 files changed, 14 insertions, 63 deletions

diff --git a/fs/jffs2/scan.c b/fs/jffs2/scan.c
index 6fce703..87b0a41 100644
--- a/fs/jffs2/scan.c
+++ b/fs/jffs2/scan.c
@@ -317,7 +317,6 @@ static int jffs2_scan_xattr_node(struct jffs2_sb_info *c, struct jffs2_erasebloc
 				 struct jffs2_summary *s)
 {
 	struct jffs2_xattr_datum *xd;
-	struct jffs2_raw_node_ref *raw;
 	uint32_t totlen, crc;
 	int err;
 
@@ -340,13 +339,8 @@ static int jffs2_scan_xattr_node(struct jffs2_sb_info *c, struct jffs2_erasebloc
 		return 0;
 	}
 
-	raw =  jffs2_alloc_raw_node_ref();
-	if (!raw)
-		return -ENOMEM;
-
 	xd = jffs2_setup_xattr_datum(c, je32_to_cpu(rx->xid), je32_to_cpu(rx->version));
 	if (IS_ERR(xd)) {
-		jffs2_free_raw_node_ref(raw);
 		if (PTR_ERR(xd) == -EEXIST) {
 			if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rx->totlen)))))
 				return err;
@@ -358,12 +352,9 @@ static int jffs2_scan_xattr_node(struct jffs2_sb_info *c, struct jffs2_erasebloc
 	xd->name_len = rx->name_len;
 	xd->value_len = je16_to_cpu(rx->value_len);
 	xd->data_crc = je32_to_cpu(rx->data_crc);
-	xd->node = raw;
-
-	raw->flash_offset = ofs | REF_PRISTINE;
 
-	jffs2_link_node_ref(c, jeb, raw, totlen, NULL);
-	/* FIXME */ raw->next_in_ino = (void *)xd;
+	xd->node = jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, totlen, NULL);
+	/* FIXME */ xd->node->next_in_ino = (void *)xd;
 
 	if (jffs2_sum_active())
 		jffs2_sum_add_xattr_mem(s, rx, ofs - jeb->offset);
@@ -377,7 +368,6 @@ static int jffs2_scan_xref_node(struct jffs2_sb_info *c, struct jffs2_eraseblock
 				struct jffs2_summary *s)
 {
 	struct jffs2_xattr_ref *ref;
-	struct jffs2_raw_node_ref *raw;
 	uint32_t crc;
 	int err;
 
@@ -404,12 +394,6 @@ static int jffs2_scan_xref_node(struct jffs2_sb_info *c, struct jffs2_eraseblock
 	if (!ref)
 		return -ENOMEM;
 
-	raw =  jffs2_alloc_raw_node_ref();
-	if (!raw) {
-		jffs2_free_xattr_ref(ref);
-		return -ENOMEM;
-	}
-
 	/* BEFORE jffs2_build_xattr_subsystem() called, 
 	 * ref->xid is used to store 32bit xid, xd is not used
 	 * ref->ino is used to store 32bit inode-number, ic is not used
@@ -418,16 +402,13 @@ static int jffs2_scan_xref_node(struct jffs2_sb_info *c, struct jffs2_eraseblock
 	 * used to chain all xattr_ref object. It's re-chained to
 	 * jffs2_inode_cache in jffs2_build_xattr_subsystem() correctly.
 	 */
-	ref->node = raw;
 	ref->ino = je32_to_cpu(rr->ino);
 	ref->xid = je32_to_cpu(rr->xid);
 	ref->next = c->xref_temp;
 	c->xref_temp = ref;
 
-	raw->flash_offset = ofs | REF_PRISTINE;
-
-	jffs2_link_node_ref(c, jeb, raw, PAD(je32_to_cpu(rr->totlen)), NULL);
-	/* FIXME */ raw->next_in_ino = (void *)ref;
+	ref->node = jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(rr->totlen)), NULL);
+	/* FIXME */ ref->node->next_in_ino = (void *)ref;
 
 	if (jffs2_sum_active())
 		jffs2_sum_add_xref_mem(s, rr, ofs - jeb->offset);
@@ -597,6 +578,11 @@ scan_more:
 
 		jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
 
+		/* Make sure there are node refs available for use */
+		err = jffs2_prealloc_raw_node_refs(c, 2);
+		if (err)
+			return err;
+
 		cond_resched();
 
 		if (ofs & 3) {
@@ -839,14 +825,7 @@ scan_more:
 					return err;
 				ofs += PAD(sizeof(struct jffs2_unknown_node));
 			} else {
-				struct jffs2_raw_node_ref *marker_ref = jffs2_alloc_raw_node_ref();
-				if (!marker_ref) {
-					printk(KERN_NOTICE "Failed to allocate node ref for clean marker\n");
-					return -ENOMEM;
-				}
-				marker_ref->flash_offset = ofs | REF_NORMAL;
-
-				jffs2_link_node_ref(c, jeb, marker_ref, c->cleanmarker_size, NULL);
+				jffs2_link_node_ref(c, jeb, ofs | REF_NORMAL, c->cleanmarker_size, NULL);
 
 				ofs += PAD(c->cleanmarker_size);
 			}
@@ -884,14 +863,9 @@ scan_more:
 				break;
 
 			case JFFS2_FEATURE_RWCOMPAT_COPY: {
-				struct jffs2_raw_node_ref *ref;
 				D1(printk(KERN_NOTICE "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs));
 
-				ref = jffs2_alloc_raw_node_ref();
-				if (!ref)
-					return -ENOMEM;
-				ref->flash_offset = ofs | REF_PRISTINE;
-				jffs2_link_node_ref(c, jeb, ref, PAD(je32_to_cpu(node->totlen)), NULL);
+				jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(node->totlen)), NULL);
 
 				/* We can't summarise nodes we don't grok */
 				jffs2_sum_disable_collecting(s);
@@ -953,7 +927,6 @@ struct jffs2_inode_cache *jffs2_scan_make_ino_cache(struct jffs2_sb_info *c, uin
 static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 				 struct jffs2_raw_inode *ri, uint32_t ofs, struct jffs2_summary *s)
 {
-	struct jffs2_raw_node_ref *raw;
 	struct jffs2_inode_cache *ic;
 	uint32_t ino = je32_to_cpu(ri->ino);
 	int err;
@@ -969,12 +942,6 @@ static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_erasebloc
 	   Which means that the _full_ amount of time to get to proper write mode with GC
 	   operational may actually be _longer_ than before. Sucks to be me. */
 
-	raw = jffs2_alloc_raw_node_ref();
-	if (!raw) {
-		printk(KERN_NOTICE "jffs2_scan_inode_node(): allocation of node reference failed\n");
-		return -ENOMEM;
-	}
-
 	ic = jffs2_get_ino_cache(c, ino);
 	if (!ic) {
 		/* Inocache get failed. Either we read a bogus ino# or it's just genuinely the
@@ -988,21 +955,15 @@ static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_erasebloc
 			/* We believe totlen because the CRC on the node _header_ was OK, just the node itself failed. */
 			if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(ri->totlen)))))
 				return err;
-			jffs2_free_raw_node_ref(raw);
 			return 0;
 		}
 		ic = jffs2_scan_make_ino_cache(c, ino);
-		if (!ic) {
-			jffs2_free_raw_node_ref(raw);
+		if (!ic)
 			return -ENOMEM;
-		}
 	}
 
 	/* Wheee. It worked */
-
-	raw->flash_offset = ofs | REF_UNCHECKED;
-
-	jffs2_link_node_ref(c, jeb, raw, PAD(je32_to_cpu(ri->totlen)), ic);
+	jffs2_link_node_ref(c, jeb, ofs | REF_UNCHECKED, PAD(je32_to_cpu(ri->totlen)), ic);
 
 	D1(printk(KERN_DEBUG "Node is ino #%u, version %d. Range 0x%x-0x%x\n",
 		  je32_to_cpu(ri->ino), je32_to_cpu(ri->version),
@@ -1021,7 +982,6 @@ static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_erasebloc
 static int jffs2_scan_dirent_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 				  struct jffs2_raw_dirent *rd, uint32_t ofs, struct jffs2_summary *s)
 {
-	struct jffs2_raw_node_ref *raw;
 	struct jffs2_full_dirent *fd;
 	struct jffs2_inode_cache *ic;
 	uint32_t crc;
@@ -1063,23 +1023,14 @@ static int jffs2_scan_dirent_node(struct jffs2_sb_info *c, struct jffs2_eraseblo
 			return err;
 		return 0;
 	}
-	raw = jffs2_alloc_raw_node_ref();
-	if (!raw) {
-		jffs2_free_full_dirent(fd);
-		printk(KERN_NOTICE "jffs2_scan_dirent_node(): allocation of node reference failed\n");
-		return -ENOMEM;
-	}
 	ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(rd->pino));
 	if (!ic) {
 		jffs2_free_full_dirent(fd);
-		jffs2_free_raw_node_ref(raw);
 		return -ENOMEM;
 	}
 
-	raw->flash_offset = ofs | REF_PRISTINE;
-	jffs2_link_node_ref(c, jeb, raw, PAD(je32_to_cpu(rd->totlen)), ic);
+	fd->raw = jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(rd->totlen)), ic);
 
-	fd->raw = raw;
 	fd->next = NULL;
 	fd->version = je32_to_cpu(rd->version);
 	fd->ino = je32_to_cpu(rd->ino);