virtio_blk: set the zone write granularitygrafted

virtblk_read_zoned_limits() reads the write granularity that the device
reports in virtio_blk_zoned_characteristics and assigns it to the
physical block size and to io_min, but never to the limit that is named
after it. queue_limits.zone_write_granularity is left at zero, so
blk_validate_zoned_limits() raises it to the logical block size:

	if (lim->zone_write_granularity < lim->logical_block_size)
		lim->zone_write_granularity = lim->logical_block_size;

A device that reports a granularity coarser than its logical block size,
which is what the field exists to express, therefore has it silently
reduced. A 512e host managed disk passed through to a guest reports a
logical block size of 512 and a write granularity of 4096, and the guest
ends up with a zone write granularity of 512.

bio_split_alignment() returns lim->zone_write_granularity if it is non-zero
and bio_split_io_at() may split a bio with as per bio_split_alignment().
This can real to the write getting rejected by the host drive, as the write
is not aligned to the physical block size.

zonefs also takes its block size from bdev_zone_write_granularity(), so it
would incorrectly use 512 on a disk that requires 4096.

sd_zbc_read_zones() sets the limit from the physical block size for the
same reason. NVMe ZNS and null_blk leave it unset, but the fallback
gives the right answer for them, as their write granularity is the
logical block size. virtio carries a separate value that may exceed it.

Set the zone write granularity from the value that the device reports.

Fixes: 95bfec41bd3d ("virtio-blk: add support for zoned block devices")
Signed-off-by: Niklas Cassel <cassel@kernel.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Link: https://patch.msgid.link/20260918140641.2031075-2-cassel@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 866 insertions, 0 deletions

diff --git a/fs/jffs2/debug.c b/fs/jffs2/debug.c
new file mode 100644
index 000000000..0925caab2
--- /dev/null
+++ b/fs/jffs2/debug.c
@@ -0,0 +1,866 @@
+/*
+ * JFFS2 -- Journalling Flash File System, Version 2.
+ *
+ * Copyright © 2001-2007 Red Hat, Inc.
+ * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
+ *
+ * Created by David Woodhouse <dwmw2@infradead.org>
+ *
+ * For licensing information, see the file 'LICENCE' in this directory.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/pagemap.h>
+#include <linux/crc32.h>
+#include <linux/jffs2.h>
+#include <linux/mtd/mtd.h>
+#include <linux/slab.h>
+#include "nodelist.h"
+#include "debug.h"
+
+#ifdef JFFS2_DBG_SANITY_CHECKS
+
+void
+__jffs2_dbg_acct_sanity_check_nolock(struct jffs2_sb_info *c,
+				     struct jffs2_eraseblock *jeb)
+{
+	if (unlikely(jeb && jeb->used_size + jeb->dirty_size +
+			jeb->free_size + jeb->wasted_size +
+			jeb->unchecked_size != c->sector_size)) {
+		JFFS2_ERROR("eeep, space accounting for block at 0x%08x is screwed.\n", jeb->offset);
+		JFFS2_ERROR("free %#08x + dirty %#08x + used %#08x + wasted %#08x + unchecked %#08x != total %#08x.\n",
+			jeb->free_size, jeb->dirty_size, jeb->used_size,
+			jeb->wasted_size, jeb->unchecked_size, c->sector_size);
+		BUG();
+	}
+
+	if (unlikely(c->used_size + c->dirty_size + c->free_size + c->erasing_size + c->bad_size
+				+ c->wasted_size + c->unchecked_size != c->flash_size)) {
+		JFFS2_ERROR("eeep, space accounting superblock info is screwed.\n");
+		JFFS2_ERROR("free %#08x + dirty %#08x + used %#08x + erasing %#08x + bad %#08x + wasted %#08x + unchecked %#08x != total %#08x.\n",
+			c->free_size, c->dirty_size, c->used_size, c->erasing_size, c->bad_size,
+			c->wasted_size, c->unchecked_size, c->flash_size);
+		BUG();
+	}
+}
+
+void
+__jffs2_dbg_acct_sanity_check(struct jffs2_sb_info *c,
+			      struct jffs2_eraseblock *jeb)
+{
+	spin_lock(&c->erase_completion_lock);
+	jffs2_dbg_acct_sanity_check_nolock(c, jeb);
+	spin_unlock(&c->erase_completion_lock);
+}
+
+#endif /* JFFS2_DBG_SANITY_CHECKS */
+
+#ifdef JFFS2_DBG_PARANOIA_CHECKS
+/*
+ * Check the fragtree.
+ */
+void
+__jffs2_dbg_fragtree_paranoia_check(struct jffs2_inode_info *f)
+{
+	mutex_lock(&f->sem);
+	__jffs2_dbg_fragtree_paranoia_check_nolock(f);
+	mutex_unlock(&f->sem);
+}
+
+void
+__jffs2_dbg_fragtree_paranoia_check_nolock(struct jffs2_inode_info *f)
+{
+	struct jffs2_node_frag *frag;
+	int bitched = 0;
+
+	for (frag = frag_first(&f->fragtree); frag; frag = frag_next(frag)) {
+		struct jffs2_full_dnode *fn = frag->node;
+
+		if (!fn || !fn->raw)
+			continue;
+
+		if (ref_flags(fn->raw) == REF_PRISTINE) {
+			if (fn->frags > 1) {
+				JFFS2_ERROR("REF_PRISTINE node at 0x%08x had %d frags. Tell dwmw2.\n",
+					ref_offset(fn->raw), fn->frags);
+				bitched = 1;
+			}
+
+			/* A hole node which isn't multi-page should be garbage-collected
+			   and merged anyway, so we just check for the frag size here,
+			   rather than mucking around with actually reading the node
+			   and checking the compression type, which is the real way
+			   to tell a hole node. */
+			if (frag->ofs & (PAGE_SIZE-1) && frag_prev(frag)
+					&& frag_prev(frag)->size < PAGE_SIZE && frag_prev(frag)->node) {
+				JFFS2_ERROR("REF_PRISTINE node at 0x%08x had a previous non-hole frag in the same page. Tell dwmw2.\n",
+					ref_offset(fn->raw));
+				bitched = 1;
+			}
+
+			if ((frag->ofs+frag->size) & (PAGE_SIZE-1) && frag_next(frag)
+					&& frag_next(frag)->size < PAGE_SIZE && frag_next(frag)->node) {
+				JFFS2_ERROR("REF_PRISTINE node at 0x%08x (%08x-%08x) had a following non-hole frag in the same page. Tell dwmw2.\n",
+				       ref_offset(fn->raw), frag->ofs, frag->ofs+frag->size);
+				bitched = 1;
+			}
+		}
+	}
+
+	if (bitched) {
+		JFFS2_ERROR("fragtree is corrupted.\n");
+		__jffs2_dbg_dump_fragtree_nolock(f);
+		BUG();
+	}
+}
+
+/*
+ * Check if the flash contains all 0xFF before we start writing.
+ */
+void
+__jffs2_dbg_prewrite_paranoia_check(struct jffs2_sb_info *c,
+				    uint32_t ofs, int len)
+{
+	size_t retlen;
+	int ret, i;
+	unsigned char *buf;
+
+	buf = kmalloc(len, GFP_KERNEL);
+	if (!buf)
+		return;
+
+	ret = jffs2_flash_read(c, ofs, len, &retlen, buf);
+	if (ret || (retlen != len)) {
+		JFFS2_WARNING("read %d bytes failed or short. ret %d, retlen %zd.\n",
+				len, ret, retlen);
+		kfree(buf);
+		return;
+	}
+
+	ret = 0;
+	for (i = 0; i < len; i++)
+		if (buf[i] != 0xff)
+			ret = 1;
+
+	if (ret) {
+		JFFS2_ERROR("argh, about to write node to %#08x on flash, but there are data already there. The first corrupted byte is at %#08x offset.\n",
+			ofs, ofs + i);
+		__jffs2_dbg_dump_buffer(buf, len, ofs);
+		kfree(buf);
+		BUG();
+	}
+
+	kfree(buf);
+}
+
+static void __jffs2_dbg_superblock_counts(struct jffs2_sb_info *c)
+{
+	struct jffs2_eraseblock *jeb;
+	uint32_t free = 0, dirty = 0, used = 0, wasted = 0,
+		erasing = 0, bad = 0, unchecked = 0;
+	int nr_counted = 0;
+	int dump = 0;
+
+	if (c->gcblock) {
+		nr_counted++;
+		free += c->gcblock->free_size;
+		dirty += c->gcblock->dirty_size;
+		used += c->gcblock->used_size;
+		wasted += c->gcblock->wasted_size;
+		unchecked += c->gcblock->unchecked_size;
+	}
+	if (c->nextblock) {
+		nr_counted++;
+		free += c->nextblock->free_size;
+		dirty += c->nextblock->dirty_size;
+		used += c->nextblock->used_size;
+		wasted += c->nextblock->wasted_size;
+		unchecked += c->nextblock->unchecked_size;
+	}
+	list_for_each_entry(jeb, &c->clean_list, list) {
+		nr_counted++;
+		free += jeb->free_size;
+		dirty += jeb->dirty_size;
+		used += jeb->used_size;
+		wasted += jeb->wasted_size;
+		unchecked += jeb->unchecked_size;
+	}
+	list_for_each_entry(jeb, &c->very_dirty_list, list) {
+		nr_counted++;
+		free += jeb->free_size;
+		dirty += jeb->dirty_size;
+		used += jeb->used_size;
+		wasted += jeb->wasted_size;
+		unchecked += jeb->unchecked_size;
+	}
+	list_for_each_entry(jeb, &c->dirty_list, list) {
+		nr_counted++;
+		free += jeb->free_size;
+		dirty += jeb->dirty_size;
+		used += jeb->used_size;
+		wasted += jeb->wasted_size;
+		unchecked += jeb->unchecked_size;
+	}
+	list_for_each_entry(jeb, &c->erasable_list, list) {
+		nr_counted++;
+		free += jeb->free_size;
+		dirty += jeb->dirty_size;
+		used += jeb->used_size;
+		wasted += jeb->wasted_size;
+		unchecked += jeb->unchecked_size;
+	}
+	list_for_each_entry(jeb, &c->erasable_pending_wbuf_list, list) {
+		nr_counted++;
+		free += jeb->free_size;
+		dirty += jeb->dirty_size;
+		used += jeb->used_size;
+		wasted += jeb->wasted_size;
+		unchecked += jeb->unchecked_size;
+	}
+	list_for_each_entry(jeb, &c->erase_pending_list, list) {
+		nr_counted++;
+		free += jeb->free_size;
+		dirty += jeb->dirty_size;
+		used += jeb->used_size;
+		wasted += jeb->wasted_size;
+		unchecked += jeb->unchecked_size;
+	}
+	list_for_each_entry(jeb, &c->free_list, list) {
+		nr_counted++;
+		free += jeb->free_size;
+		dirty += jeb->dirty_size;
+		used += jeb->used_size;
+		wasted += jeb->wasted_size;
+		unchecked += jeb->unchecked_size;
+	}
+	list_for_each_entry(jeb, &c->bad_used_list, list) {
+		nr_counted++;
+		free += jeb->free_size;
+		dirty += jeb->dirty_size;
+		used += jeb->used_size;
+		wasted += jeb->wasted_size;
+		unchecked += jeb->unchecked_size;
+	}
+
+	list_for_each_entry(jeb, &c->erasing_list, list) {
+		nr_counted++;
+		erasing += c->sector_size;
+	}
+	list_for_each_entry(jeb, &c->erase_checking_list, list) {
+		nr_counted++;
+		erasing += c->sector_size;
+	}
+	list_for_each_entry(jeb, &c->erase_complete_list, list) {
+		nr_counted++;
+		erasing += c->sector_size;
+	}
+	list_for_each_entry(jeb, &c->bad_list, list) {
+		nr_counted++;
+		bad += c->sector_size;
+	}
+
+#define check(sz)							\
+do {									\
+	if (sz != c->sz##_size) {					\
+		pr_warn("%s_size mismatch counted 0x%x, c->%s_size 0x%x\n", \
+			#sz, sz, #sz, c->sz##_size);			\
+		dump = 1;						\
+	}								\
+} while (0)
+
+	check(free);
+	check(dirty);
+	check(used);
+	check(wasted);
+	check(unchecked);
+	check(bad);
+	check(erasing);
+
+#undef check
+
+	if (nr_counted != c->nr_blocks) {
+		pr_warn("%s counted only 0x%x blocks of 0x%x. Where are the others?\n",
+			__func__, nr_counted, c->nr_blocks);
+		dump = 1;
+	}
+
+	if (dump) {
+		__jffs2_dbg_dump_block_lists_nolock(c);
+		BUG();
+	}
+}
+
+/*
+ * Check the space accounting and node_ref list correctness for the JFFS2 erasable block 'jeb'.
+ */
+void
+__jffs2_dbg_acct_paranoia_check(struct jffs2_sb_info *c,
+				struct jffs2_eraseblock *jeb)
+{
+	spin_lock(&c->erase_completion_lock);
+	__jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
+	spin_unlock(&c->erase_completion_lock);
+}
+
+void
+__jffs2_dbg_acct_paranoia_check_nolock(struct jffs2_sb_info *c,
+				       struct jffs2_eraseblock *jeb)
+{
+	uint32_t my_used_size = 0;
+	uint32_t my_unchecked_size = 0;
+	uint32_t my_dirty_size = 0;
+	struct jffs2_raw_node_ref *ref2 = jeb->first_node;
+
+	while (ref2) {
+		uint32_t totlen = ref_totlen(c, jeb, ref2);
+
+		if (ref_offset(ref2) < jeb->offset ||
+				ref_offset(ref2) > jeb->offset + c->sector_size) {
+			JFFS2_ERROR("node_ref %#08x shouldn't be in block at %#08x.\n",
+				ref_offset(ref2), jeb->offset);
+			goto error;
+
+		}
+		if (ref_flags(ref2) == REF_UNCHECKED)
+			my_unchecked_size += totlen;
+		else if (!ref_obsolete(ref2))
+			my_used_size += totlen;
+		else
+			my_dirty_size += totlen;
+
+		if ((!ref_next(ref2)) != (ref2 == jeb->last_node)) {
+			JFFS2_ERROR("node_ref for node at %#08x (mem %p) has next at %#08x (mem %p), last_node is at %#08x (mem %p).\n",
+				    ref_offset(ref2), ref2, ref_offset(ref_next(ref2)), ref_next(ref2),
+				    ref_offset(jeb->last_node), jeb->last_node);
+			goto error;
+		}
+		ref2 = ref_next(ref2);
+	}
+
+	if (my_used_size != jeb->used_size) {
+		JFFS2_ERROR("Calculated used size %#08x != stored used size %#08x.\n",
+			my_used_size, jeb->used_size);
+		goto error;
+	}
+
+	if (my_unchecked_size != jeb->unchecked_size) {
+		JFFS2_ERROR("Calculated unchecked size %#08x != stored unchecked size %#08x.\n",
+			my_unchecked_size, jeb->unchecked_size);
+		goto error;
+	}
+
+#if 0
+	/* This should work when we implement ref->__totlen elemination */
+	if (my_dirty_size != jeb->dirty_size + jeb->wasted_size) {
+		JFFS2_ERROR("Calculated dirty+wasted size %#08x != stored dirty + wasted size %#08x\n",
+			my_dirty_size, jeb->dirty_size + jeb->wasted_size);
+		goto error;
+	}
+
+	if (jeb->free_size == 0
+		&& my_used_size + my_unchecked_size + my_dirty_size != c->sector_size) {
+		JFFS2_ERROR("The sum of all nodes in block (%#x) != size of block (%#x)\n",
+			my_used_size + my_unchecked_size + my_dirty_size,
+			c->sector_size);
+		goto error;
+	}
+#endif
+
+	if (!(c->flags & (JFFS2_SB_FLAG_BUILDING|JFFS2_SB_FLAG_SCANNING)))
+		__jffs2_dbg_superblock_counts(c);
+
+	return;
+
+error:
+	__jffs2_dbg_dump_node_refs_nolock(c, jeb);
+	__jffs2_dbg_dump_jeb_nolock(jeb);
+	__jffs2_dbg_dump_block_lists_nolock(c);
+	BUG();
+
+}
+#endif /* JFFS2_DBG_PARANOIA_CHECKS */
+
+#if defined(JFFS2_DBG_DUMPS) || defined(JFFS2_DBG_PARANOIA_CHECKS)
+/*
+ * Dump the node_refs of the 'jeb' JFFS2 eraseblock.
+ */
+void
+__jffs2_dbg_dump_node_refs(struct jffs2_sb_info *c,
+			   struct jffs2_eraseblock *jeb)
+{
+	spin_lock(&c->erase_completion_lock);
+	__jffs2_dbg_dump_node_refs_nolock(c, jeb);
+	spin_unlock(&c->erase_completion_lock);
+}
+
+void
+__jffs2_dbg_dump_node_refs_nolock(struct jffs2_sb_info *c,
+				  struct jffs2_eraseblock *jeb)
+{
+	struct jffs2_raw_node_ref *ref;
+	int i = 0;
+
+	printk(JFFS2_DBG_MSG_PREFIX " Dump node_refs of the eraseblock %#08x\n", jeb->offset);
+	if (!jeb->first_node) {
+		printk(JFFS2_DBG_MSG_PREFIX " no nodes in the eraseblock %#08x\n", jeb->offset);
+		return;
+	}
+
+	printk(JFFS2_DBG);
+	for (ref = jeb->first_node; ; ref = ref_next(ref)) {
+		printk("%#08x", ref_offset(ref));
+#ifdef TEST_TOTLEN
+		printk("(%x)", ref->__totlen);
+#endif
+		if (ref_next(ref))
+			printk("->");
+		else
+			break;
+		if (++i == 4) {
+			i = 0;
+			printk("\n" JFFS2_DBG);
+		}
+	}
+	printk("\n");
+}
+
+/*
+ * Dump an eraseblock's space accounting.
+ */
+void
+__jffs2_dbg_dump_jeb(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
+{
+	spin_lock(&c->erase_completion_lock);
+	__jffs2_dbg_dump_jeb_nolock(jeb);
+	spin_unlock(&c->erase_completion_lock);
+}
+
+void
+__jffs2_dbg_dump_jeb_nolock(struct jffs2_eraseblock *jeb)
+{
+	if (!jeb)
+		return;
+
+	printk(JFFS2_DBG_MSG_PREFIX " dump space accounting for the eraseblock at %#08x:\n",
+			jeb->offset);
+
+	printk(JFFS2_DBG "used_size: %#08x\n",		jeb->used_size);
+	printk(JFFS2_DBG "dirty_size: %#08x\n",		jeb->dirty_size);
+	printk(JFFS2_DBG "wasted_size: %#08x\n",	jeb->wasted_size);
+	printk(JFFS2_DBG "unchecked_size: %#08x\n",	jeb->unchecked_size);
+	printk(JFFS2_DBG "free_size: %#08x\n",		jeb->free_size);
+}
+
+void
+__jffs2_dbg_dump_block_lists(struct jffs2_sb_info *c)
+{
+	spin_lock(&c->erase_completion_lock);
+	__jffs2_dbg_dump_block_lists_nolock(c);
+	spin_unlock(&c->erase_completion_lock);
+}
+
+void
+__jffs2_dbg_dump_block_lists_nolock(struct jffs2_sb_info *c)
+{
+	printk(JFFS2_DBG_MSG_PREFIX " dump JFFS2 blocks lists:\n");
+
+	printk(JFFS2_DBG "flash_size: %#08x\n",		c->flash_size);
+	printk(JFFS2_DBG "used_size: %#08x\n",		c->used_size);
+	printk(JFFS2_DBG "dirty_size: %#08x\n",		c->dirty_size);
+	printk(JFFS2_DBG "wasted_size: %#08x\n",	c->wasted_size);
+	printk(JFFS2_DBG "unchecked_size: %#08x\n",	c->unchecked_size);
+	printk(JFFS2_DBG "free_size: %#08x\n",		c->free_size);
+	printk(JFFS2_DBG "erasing_size: %#08x\n",	c->erasing_size);
+	printk(JFFS2_DBG "bad_size: %#08x\n",		c->bad_size);
+	printk(JFFS2_DBG "sector_size: %#08x\n",	c->sector_size);
+	printk(JFFS2_DBG "jffs2_reserved_blocks size: %#08x\n",
+				c->sector_size * c->resv_blocks_write);
+
+	if (c->nextblock)
+		printk(JFFS2_DBG "nextblock: %#08x (used %#08x, dirty %#08x, wasted %#08x, unchecked %#08x, free %#08x)\n",
+			c->nextblock->offset, c->nextblock->used_size,
+			c->nextblock->dirty_size, c->nextblock->wasted_size,
+			c->nextblock->unchecked_size, c->nextblock->free_size);
+	else
+		printk(JFFS2_DBG "nextblock: NULL\n");
+
+	if (c->gcblock)
+		printk(JFFS2_DBG "gcblock: %#08x (used %#08x, dirty %#08x, wasted %#08x, unchecked %#08x, free %#08x)\n",
+			c->gcblock->offset, c->gcblock->used_size, c->gcblock->dirty_size,
+			c->gcblock->wasted_size, c->gcblock->unchecked_size, c->gcblock->free_size);
+	else
+		printk(JFFS2_DBG "gcblock: NULL\n");
+
+	if (list_empty(&c->clean_list)) {
+		printk(JFFS2_DBG "clean_list: empty\n");
+	} else {
+		struct list_head *this;
+		int numblocks = 0;
+		uint32_t dirty = 0;
+
+		list_for_each(this, &c->clean_list) {
+			struct jffs2_eraseblock *jeb = list_entry(this, struct jffs2_eraseblock, list);
+			numblocks ++;
+			dirty += jeb->wasted_size;
+			if (!(jeb->used_size == 0 && jeb->dirty_size == 0 && jeb->wasted_size == 0)) {
+				printk(JFFS2_DBG "clean_list: %#08x (used %#08x, dirty %#08x, wasted %#08x, unchecked %#08x, free %#08x)\n",
+					jeb->offset, jeb->used_size, jeb->dirty_size, jeb->wasted_size,
+					jeb->unchecked_size, jeb->free_size);
+			}
+		}
+
+		printk (JFFS2_DBG "Contains %d blocks with total wasted size %u, average wasted size: %u\n",
+			numblocks, dirty, dirty / numblocks);
+	}
+
+	if (list_empty(&c->very_dirty_list)) {
+		printk(JFFS2_DBG "very_dirty_list: empty\n");
+	} else {
+		struct list_head *this;
+		int numblocks = 0;
+		uint32_t dirty = 0;
+
+		list_for_each(this, &c->very_dirty_list) {
+			struct jffs2_eraseblock *jeb = list_entry(this, struct jffs2_eraseblock, list);
+
+			numblocks ++;
+			dirty += jeb->dirty_size;
+			if (!(jeb->used_size == 0 && jeb->dirty_size == 0 && jeb->wasted_size == 0)) {
+				printk(JFFS2_DBG "very_dirty_list: %#08x (used %#08x, dirty %#08x, wasted %#08x, unchecked %#08x, free %#08x)\n",
+					jeb->offset, jeb->used_size, jeb->dirty_size, jeb->wasted_size,
+					jeb->unchecked_size, jeb->free_size);
+			}
+		}
+
+		printk (JFFS2_DBG "Contains %d blocks with total dirty size %u, average dirty size: %u\n",
+			numblocks, dirty, dirty / numblocks);
+	}
+
+	if (list_empty(&c->dirty_list)) {
+		printk(JFFS2_DBG "dirty_list: empty\n");
+	} else {
+		struct list_head *this;
+		int numblocks = 0;
+		uint32_t dirty = 0;
+
+		list_for_each(this, &c->dirty_list) {
+			struct jffs2_eraseblock *jeb = list_entry(this, struct jffs2_eraseblock, list);
+
+			numblocks ++;
+			dirty += jeb->dirty_size;
+			if (!(jeb->used_size == 0 && jeb->dirty_size == 0 && jeb->wasted_size == 0)) {
+				printk(JFFS2_DBG "dirty_list: %#08x (used %#08x, dirty %#08x, wasted %#08x, unchecked %#08x, free %#08x)\n",
+					jeb->offset, jeb->used_size, jeb->dirty_size, jeb->wasted_size,
+					jeb->unchecked_size, jeb->free_size);
+			}
+		}
+
+		printk (JFFS2_DBG "contains %d blocks with total dirty size %u, average dirty size: %u\n",
+			numblocks, dirty, dirty / numblocks);
+	}
+
+	if (list_empty(&c->erasable_list)) {
+		printk(JFFS2_DBG "erasable_list: empty\n");
+	} else {
+		struct list_head *this;
+
+		list_for_each(this, &c->erasable_list) {
+			struct jffs2_eraseblock *jeb = list_entry(this, struct jffs2_eraseblock, list);
+
+			if (!(jeb->used_size == 0 && jeb->dirty_size == 0 && jeb->wasted_size == 0)) {
+				printk(JFFS2_DBG "erasable_list: %#08x (used %#08x, dirty %#08x, wasted %#08x, unchecked %#08x, free %#08x)\n",
+					jeb->offset, jeb->used_size, jeb->dirty_size, jeb->wasted_size,
+					jeb->unchecked_size, jeb->free_size);
+			}
+		}
+	}
+
+	if (list_empty(&c->erasing_list)) {
+		printk(JFFS2_DBG "erasing_list: empty\n");
+	} else {
+		struct list_head *this;
+
+		list_for_each(this, &c->erasing_list) {
+			struct jffs2_eraseblock *jeb = list_entry(this, struct jffs2_eraseblock, list);
+
+			if (!(jeb->used_size == 0 && jeb->dirty_size == 0 && jeb->wasted_size == 0)) {
+				printk(JFFS2_DBG "erasing_list: %#08x (used %#08x, dirty %#08x, wasted %#08x, unchecked %#08x, free %#08x)\n",
+					jeb->offset, jeb->used_size, jeb->dirty_size, jeb->wasted_size,
+					jeb->unchecked_size, jeb->free_size);
+			}
+		}
+	}
+	if (list_empty(&c->erase_checking_list)) {
+		printk(JFFS2_DBG "erase_checking_list: empty\n");
+	} else {
+		struct list_head *this;
+
+		list_for_each(this, &c->erase_checking_list) {
+			struct jffs2_eraseblock *jeb = list_entry(this, struct jffs2_eraseblock, list);
+
+			if (!(jeb->used_size == 0 && jeb->dirty_size == 0 && jeb->wasted_size == 0)) {
+				printk(JFFS2_DBG "erase_checking_list: %#08x (used %#08x, dirty %#08x, wasted %#08x, unchecked %#08x, free %#08x)\n",
+					jeb->offset, jeb->used_size, jeb->dirty_size, jeb->wasted_size,
+					jeb->unchecked_size, jeb->free_size);
+			}
+		}
+	}
+
+	if (list_empty(&c->erase_pending_list)) {
+		printk(JFFS2_DBG "erase_pending_list: empty\n");
+	} else {
+		struct list_head *this;
+
+		list_for_each(this, &c->erase_pending_list) {
+			struct jffs2_eraseblock *jeb = list_entry(this, struct jffs2_eraseblock, list);
+
+			if (!(jeb->used_size == 0 && jeb->dirty_size == 0 && jeb->wasted_size == 0)) {
+				printk(JFFS2_DBG "erase_pending_list: %#08x (used %#08x, dirty %#08x, wasted %#08x, unchecked %#08x, free %#08x)\n",
+					jeb->offset, jeb->used_size, jeb->dirty_size, jeb->wasted_size,
+					jeb->unchecked_size, jeb->free_size);
+			}
+		}
+	}
+
+	if (list_empty(&c->erasable_pending_wbuf_list)) {
+		printk(JFFS2_DBG "erasable_pending_wbuf_list: empty\n");
+	} else {
+		struct list_head *this;
+
+		list_for_each(this, &c->erasable_pending_wbuf_list) {
+			struct jffs2_eraseblock *jeb = list_entry(this, struct jffs2_eraseblock, list);
+
+			if (!(jeb->used_size == 0 && jeb->dirty_size == 0 && jeb->wasted_size == 0)) {
+				printk(JFFS2_DBG "erasable_pending_wbuf_list: %#08x (used %#08x, dirty %#08x, wasted %#08x, unchecked %#08x, free %#08x)\n",
+					jeb->offset, jeb->used_size, jeb->dirty_size, jeb->wasted_size,
+					jeb->unchecked_size, jeb->free_size);
+			}
+		}
+	}
+
+	if (list_empty(&c->free_list)) {
+		printk(JFFS2_DBG "free_list: empty\n");
+	} else {
+		struct list_head *this;
+
+		list_for_each(this, &c->free_list) {
+			struct jffs2_eraseblock *jeb = list_entry(this, struct jffs2_eraseblock, list);
+
+			if (!(jeb->used_size == 0 && jeb->dirty_size == 0 && jeb->wasted_size == 0)) {
+				printk(JFFS2_DBG "free_list: %#08x (used %#08x, dirty %#08x, wasted %#08x, unchecked %#08x, free %#08x)\n",
+					jeb->offset, jeb->used_size, jeb->dirty_size, jeb->wasted_size,
+					jeb->unchecked_size, jeb->free_size);
+			}
+		}
+	}
+
+	if (list_empty(&c->bad_list)) {
+		printk(JFFS2_DBG "bad_list: empty\n");
+	} else {
+		struct list_head *this;
+
+		list_for_each(this, &c->bad_list) {
+			struct jffs2_eraseblock *jeb = list_entry(this, struct jffs2_eraseblock, list);
+
+			if (!(jeb->used_size == 0 && jeb->dirty_size == 0 && jeb->wasted_size == 0)) {
+				printk(JFFS2_DBG "bad_list: %#08x (used %#08x, dirty %#08x, wasted %#08x, unchecked %#08x, free %#08x)\n",
+					jeb->offset, jeb->used_size, jeb->dirty_size, jeb->wasted_size,
+					jeb->unchecked_size, jeb->free_size);
+			}
+		}
+	}
+
+	if (list_empty(&c->bad_used_list)) {
+		printk(JFFS2_DBG "bad_used_list: empty\n");
+	} else {
+		struct list_head *this;
+
+		list_for_each(this, &c->bad_used_list) {
+			struct jffs2_eraseblock *jeb = list_entry(this, struct jffs2_eraseblock, list);
+
+			if (!(jeb->used_size == 0 && jeb->dirty_size == 0 && jeb->wasted_size == 0)) {
+				printk(JFFS2_DBG "bad_used_list: %#08x (used %#08x, dirty %#08x, wasted %#08x, unchecked %#08x, free %#08x)\n",
+					jeb->offset, jeb->used_size, jeb->dirty_size, jeb->wasted_size,
+					jeb->unchecked_size, jeb->free_size);
+			}
+		}
+	}
+}
+
+void
+__jffs2_dbg_dump_fragtree(struct jffs2_inode_info *f)
+{
+	mutex_lock(&f->sem);
+	jffs2_dbg_dump_fragtree_nolock(f);
+	mutex_unlock(&f->sem);
+}
+
+void
+__jffs2_dbg_dump_fragtree_nolock(struct jffs2_inode_info *f)
+{
+	struct jffs2_node_frag *this = frag_first(&f->fragtree);
+	uint32_t lastofs = 0;
+	int buggy = 0;
+
+	printk(JFFS2_DBG_MSG_PREFIX " dump fragtree of ino #%u\n", f->inocache->ino);
+	while(this) {
+		if (this->node)
+			printk(JFFS2_DBG "frag %#04x-%#04x: %#08x(%d) on flash (*%p), left (%p), right (%p), parent (%p)\n",
+				this->ofs, this->ofs+this->size, ref_offset(this->node->raw),
+				ref_flags(this->node->raw), this, frag_left(this), frag_right(this),
+				frag_parent(this));
+		else
+			printk(JFFS2_DBG "frag %#04x-%#04x: hole (*%p). left (%p), right (%p), parent (%p)\n",
+				this->ofs, this->ofs+this->size, this, frag_left(this),
+				frag_right(this), frag_parent(this));
+		if (this->ofs != lastofs)
+			buggy = 1;
+		lastofs = this->ofs + this->size;
+		this = frag_next(this);
+	}
+
+	if (f->metadata)
+		printk(JFFS2_DBG "metadata at 0x%08x\n", ref_offset(f->metadata->raw));
+
+	if (buggy) {
+		JFFS2_ERROR("frag tree got a hole in it.\n");
+		BUG();
+	}
+}
+
+#define JFFS2_BUFDUMP_BYTES_PER_LINE	32
+void
+__jffs2_dbg_dump_buffer(unsigned char *buf, int len, uint32_t offs)
+{
+	int skip;
+	int i;
+
+	printk(JFFS2_DBG_MSG_PREFIX " dump from offset %#08x to offset %#08x (%x bytes).\n",
+		offs, offs + len, len);
+	i = skip = offs % JFFS2_BUFDUMP_BYTES_PER_LINE;
+	offs = offs & ~(JFFS2_BUFDUMP_BYTES_PER_LINE - 1);
+
+	if (skip != 0)
+		printk(JFFS2_DBG "%#08x: ", offs);
+
+	while (skip--)
+		printk("   ");
+
+	while (i < len) {
+		if ((i % JFFS2_BUFDUMP_BYTES_PER_LINE) == 0 && i != len -1) {
+			if (i != 0)
+				printk("\n");
+			offs += JFFS2_BUFDUMP_BYTES_PER_LINE;
+			printk(JFFS2_DBG "%0#8x: ", offs);
+		}
+
+		printk("%02x ", buf[i]);
+
+		i += 1;
+	}
+
+	printk("\n");
+}
+
+/*
+ * Dump a JFFS2 node.
+ */
+void
+__jffs2_dbg_dump_node(struct jffs2_sb_info *c, uint32_t ofs)
+{
+	union jffs2_node_union node;
+	int len = sizeof(union jffs2_node_union);
+	size_t retlen;
+	uint32_t crc;
+	int ret;
+
+	printk(JFFS2_DBG_MSG_PREFIX " dump node at offset %#08x.\n", ofs);
+
+	ret = jffs2_flash_read(c, ofs, len, &retlen, (unsigned char *)&node);
+	if (ret || (retlen != len)) {
+		JFFS2_ERROR("read %d bytes failed or short. ret %d, retlen %zd.\n",
+			len, ret, retlen);
+		return;
+	}
+
+	printk(JFFS2_DBG "magic:\t%#04x\n", je16_to_cpu(node.u.magic));
+	printk(JFFS2_DBG "nodetype:\t%#04x\n", je16_to_cpu(node.u.nodetype));
+	printk(JFFS2_DBG "totlen:\t%#08x\n", je32_to_cpu(node.u.totlen));
+	printk(JFFS2_DBG "hdr_crc:\t%#08x\n", je32_to_cpu(node.u.hdr_crc));
+
+	crc = crc32(0, &node.u, sizeof(node.u) - 4);
+	if (crc != je32_to_cpu(node.u.hdr_crc)) {
+		JFFS2_ERROR("wrong common header CRC.\n");
+		return;
+	}
+
+	if (je16_to_cpu(node.u.magic) != JFFS2_MAGIC_BITMASK &&
+		je16_to_cpu(node.u.magic) != JFFS2_OLD_MAGIC_BITMASK)
+	{
+		JFFS2_ERROR("wrong node magic: %#04x instead of %#04x.\n",
+			je16_to_cpu(node.u.magic), JFFS2_MAGIC_BITMASK);
+		return;
+	}
+
+	switch(je16_to_cpu(node.u.nodetype)) {
+
+	case JFFS2_NODETYPE_INODE:
+
+		printk(JFFS2_DBG "the node is inode node\n");
+		printk(JFFS2_DBG "ino:\t%#08x\n", je32_to_cpu(node.i.ino));
+		printk(JFFS2_DBG "version:\t%#08x\n", je32_to_cpu(node.i.version));
+		printk(JFFS2_DBG "mode:\t%#08x\n", node.i.mode.m);
+		printk(JFFS2_DBG "uid:\t%#04x\n", je16_to_cpu(node.i.uid));
+		printk(JFFS2_DBG "gid:\t%#04x\n", je16_to_cpu(node.i.gid));
+		printk(JFFS2_DBG "isize:\t%#08x\n", je32_to_cpu(node.i.isize));
+		printk(JFFS2_DBG "atime:\t%#08x\n", je32_to_cpu(node.i.atime));
+		printk(JFFS2_DBG "mtime:\t%#08x\n", je32_to_cpu(node.i.mtime));
+		printk(JFFS2_DBG "ctime:\t%#08x\n", je32_to_cpu(node.i.ctime));
+		printk(JFFS2_DBG "offset:\t%#08x\n", je32_to_cpu(node.i.offset));
+		printk(JFFS2_DBG "csize:\t%#08x\n", je32_to_cpu(node.i.csize));
+		printk(JFFS2_DBG "dsize:\t%#08x\n", je32_to_cpu(node.i.dsize));
+		printk(JFFS2_DBG "compr:\t%#02x\n", node.i.compr);
+		printk(JFFS2_DBG "usercompr:\t%#02x\n", node.i.usercompr);
+		printk(JFFS2_DBG "flags:\t%#04x\n", je16_to_cpu(node.i.flags));
+		printk(JFFS2_DBG "data_crc:\t%#08x\n", je32_to_cpu(node.i.data_crc));
+		printk(JFFS2_DBG "node_crc:\t%#08x\n", je32_to_cpu(node.i.node_crc));
+
+		crc = crc32(0, &node.i, sizeof(node.i) - 8);
+		if (crc != je32_to_cpu(node.i.node_crc)) {
+			JFFS2_ERROR("wrong node header CRC.\n");
+			return;
+		}
+		break;
+
+	case JFFS2_NODETYPE_DIRENT:
+
+		printk(JFFS2_DBG "the node is dirent node\n");
+		printk(JFFS2_DBG "pino:\t%#08x\n", je32_to_cpu(node.d.pino));
+		printk(JFFS2_DBG "version:\t%#08x\n", je32_to_cpu(node.d.version));
+		printk(JFFS2_DBG "ino:\t%#08x\n", je32_to_cpu(node.d.ino));
+		printk(JFFS2_DBG "mctime:\t%#08x\n", je32_to_cpu(node.d.mctime));
+		printk(JFFS2_DBG "nsize:\t%#02x\n", node.d.nsize);
+		printk(JFFS2_DBG "type:\t%#02x\n", node.d.type);
+		printk(JFFS2_DBG "node_crc:\t%#08x\n", je32_to_cpu(node.d.node_crc));
+		printk(JFFS2_DBG "name_crc:\t%#08x\n", je32_to_cpu(node.d.name_crc));
+
+		node.d.name[node.d.nsize] = '\0';
+		printk(JFFS2_DBG "name:\t\"%s\"\n", node.d.name);
+
+		crc = crc32(0, &node.d, sizeof(node.d) - 8);
+		if (crc != je32_to_cpu(node.d.node_crc)) {
+			JFFS2_ERROR("wrong node header CRC.\n");
+			return;
+		}
+		break;
+
+	default:
+		printk(JFFS2_DBG "node type is unknown\n");
+		break;
+	}
+}
+#endif /* JFFS2_DBG_DUMPS || JFFS2_DBG_PARANOIA_CHECKS */