*
* For licensing information, see the file 'LICENCE' in this directory.
*
- * $Id: nodelist.c,v 1.103 2005/07/31 08:20:44 dedekind Exp $
+ * $Id: nodelist.c,v 1.104 2005/08/01 12:05:19 dedekind Exp $
*
*/
/* We know frag->ofs <= size. That's what lookup does for us */
if (frag && frag->ofs != size) {
- if (frag->ofs+frag->size >= size) {
+ if (frag->ofs+frag->size > size) {
JFFS2_DBG_FRAGTREE2("truncating frag 0x%08x-0x%08x\n", frag->ofs, frag->ofs+frag->size);
frag->size = size - frag->ofs;
}
jffs2_obsolete_node_frag(c, frag);
frag = next;
}
+
+ if (size == 0)
+ return;
+
+ /*
+ * If the last fragment starts at the RAM page boundary, it is
+ * REF_PRISTINE irrespective of its size.
+ */
+ frag = frag_last(list);
+ if ((frag->ofs & (PAGE_CACHE_SIZE - 1)) == 0) {
+ JFFS2_DBG_FRAGTREE2("marking the last fragment 0x%08x-0x%08x REF_PRISTINE.\n",
+ frag->ofs, frag->ofs + frag->size);
+ frag->node->raw->flash_offset = ref_offset(frag->node->raw) | REF_PRISTINE;
+ }
}
void jffs2_obsolete_node_frag(struct jffs2_sb_info *c, struct jffs2_node_frag *this)
rb_link_node(&newfrag->rb, &base->rb, link);
}
+/*
+ * Allocate and initializes a new fragment.
+ */
+static inline struct jffs2_node_frag * new_fragment(struct jffs2_full_dnode *fn, uint32_t ofs, uint32_t size)
+{
+ struct jffs2_node_frag *newfrag;
+
+ newfrag = jffs2_alloc_node_frag();
+ if (likely(newfrag)) {
+ newfrag->ofs = ofs;
+ newfrag->size = size;
+ newfrag->node = fn;
+ } else {
+ JFFS2_ERROR("cannot allocate a jffs2_node_frag object\n");
+ }
+
+ return newfrag;
+}
+
+/*
+ * Called when there is no overlapping fragment exist. Inserts a hole before the new
+ * fragment and inserts the new fragment to the fragtree.
+ */
+static int no_overlapping_node(struct jffs2_sb_info *c, struct rb_root *root,
+ struct jffs2_node_frag *newfrag,
+ struct jffs2_node_frag *this, uint32_t lastend)
+{
+ if (lastend < newfrag->node->ofs) {
+ /* put a hole in before the new fragment */
+ struct jffs2_node_frag *holefrag;
+
+ holefrag= new_fragment(NULL, lastend, newfrag->node->ofs - lastend);
+ if (unlikely(!holefrag)) {
+ jffs2_free_node_frag(newfrag);
+ return -ENOMEM;
+ }
+
+ if (this) {
+ /* By definition, the 'this' node has no right-hand child,
+ because there are no frags with offset greater than it.
+ So that's where we want to put the hole */
+ JFFS2_DBG_FRAGTREE2("add hole frag %u-%u on the right of the new frag.\n",
+ holefrag->ofs, holefrag->ofs + holefrag->size);
+ rb_link_node(&holefrag->rb, &this->rb, &this->rb.rb_right);
+ } else {
+ JFFS2_DBG_FRAGTREE2("Add hole frag %u-%u to the root of the tree.\n",
+ holefrag->ofs, holefrag->ofs + holefrag->size);
+ rb_link_node(&holefrag->rb, NULL, &root->rb_node);
+ }
+ rb_insert_color(&holefrag->rb, root);
+ this = holefrag;
+ }
+
+ if (this) {
+ /* By definition, the 'this' node has no right-hand child,
+ because there are no frags with offset greater than it.
+ So that's where we want to put new fragment */
+ JFFS2_DBG_FRAGTREE2("add the new node at the right\n");
+ rb_link_node(&newfrag->rb, &this->rb, &this->rb.rb_right);
+ } else {
+ JFFS2_DBG_FRAGTREE2("insert the new node at the root of the tree\n");
+ rb_link_node(&newfrag->rb, NULL, &root->rb_node);
+ }
+ rb_insert_color(&newfrag->rb, root);
+
+ return 0;
+}
+
/* Doesn't set inode->i_size */
-static int jffs2_add_frag_to_fragtree(struct jffs2_sb_info *c, struct rb_root *list, struct jffs2_node_frag *newfrag)
+static int jffs2_add_frag_to_fragtree(struct jffs2_sb_info *c, struct rb_root *root, struct jffs2_node_frag *newfrag)
{
struct jffs2_node_frag *this;
uint32_t lastend;
/* Skip all the nodes which are completed before this one starts */
- this = jffs2_lookup_node_frag(list, newfrag->node->ofs);
+ this = jffs2_lookup_node_frag(root, newfrag->node->ofs);
if (this) {
JFFS2_DBG_FRAGTREE2("lookup gave frag 0x%04x-0x%04x; phys 0x%08x (*%p)\n",
lastend = 0;
}
- /* See if we ran off the end of the list */
+ /* See if we ran off the end of the fragtree */
if (lastend <= newfrag->ofs) {
/* We did */
mark_ref_normal(newfrag->node->raw);
}
- if (lastend < newfrag->node->ofs) {
- /* ... and we need to put a hole in before the new node */
- struct jffs2_node_frag *holefrag = jffs2_alloc_node_frag();
- if (!holefrag) {
- jffs2_free_node_frag(newfrag);
- return -ENOMEM;
- }
- holefrag->ofs = lastend;
- holefrag->size = newfrag->node->ofs - lastend;
- holefrag->node = NULL;
- if (this) {
- /* By definition, the 'this' node has no right-hand child,
- because there are no frags with offset greater than it.
- So that's where we want to put the hole */
- JFFS2_DBG_FRAGTREE2("adding hole frag (%p) on right of node at (%p)\n", holefrag, this);
- rb_link_node(&holefrag->rb, &this->rb, &this->rb.rb_right);
- } else {
- JFFS2_DBG_FRAGTREE2("adding hole frag (%p) at root of tree\n", holefrag);
- rb_link_node(&holefrag->rb, NULL, &list->rb_node);
- }
- rb_insert_color(&holefrag->rb, list);
- this = holefrag;
- }
- if (this) {
- /* By definition, the 'this' node has no right-hand child,
- because there are no frags with offset greater than it.
- So that's where we want to put new fragment */
- JFFS2_DBG_FRAGTREE2("adding new frag (%p) on right of node at (%p)\n", newfrag, this);
- rb_link_node(&newfrag->rb, &this->rb, &this->rb.rb_right);
- } else {
- JFFS2_DBG_FRAGTREE2("adding new frag (%p) at root of tree\n", newfrag);
- rb_link_node(&newfrag->rb, NULL, &list->rb_node);
- }
- rb_insert_color(&newfrag->rb, list);
- return 0;
+ return no_overlapping_node(c, root, newfrag, this, lastend);
}
- JFFS2_DBG_FRAGTREE2("dealing with frag 0x%04x-0x%04x; phys 0x%08x (*%p)\n",
- this->ofs, this->ofs+this->size, this->node?(ref_offset(this->node->raw)):0xffffffff, this);
+ if (this->node)
+ JFFS2_DBG_FRAGTREE2("dealing with frag %u-%u, phys %#08x(%d).\n",
+ this->ofs, this->ofs + this->size,
+ ref_offset(this->node->raw), ref_flags(this->node->raw));
+ else
+ JFFS2_DBG_FRAGTREE2("dealing with hole frag %u-%u.\n",
+ this->ofs, this->ofs + this->size);
/* OK. 'this' is pointing at the first frag that newfrag->ofs at least partially obsoletes,
* - i.e. newfrag->ofs < this->ofs+this->size && newfrag->ofs >= this->ofs
if (this->ofs + this->size > newfrag->ofs + newfrag->size) {
/* The new node splits 'this' frag into two */
- struct jffs2_node_frag *newfrag2 = jffs2_alloc_node_frag();
- if (!newfrag2) {
- jffs2_free_node_frag(newfrag);
- return -ENOMEM;
- }
+ struct jffs2_node_frag *newfrag2;
+
if (this->node)
JFFS2_DBG_FRAGTREE2("split old frag 0x%04x-0x%04x, phys 0x%08x\n",
this->ofs, this->ofs+this->size, ref_offset(this->node->raw));
this->ofs, this->ofs+this->size, ref_offset(this->node->raw));
/* New second frag pointing to this's node */
- newfrag2->ofs = newfrag->ofs + newfrag->size;
- newfrag2->size = (this->ofs+this->size) - newfrag2->ofs;
- newfrag2->node = this->node;
+ newfrag2 = new_fragment(this->node, newfrag->ofs + newfrag->size,
+ this->ofs + this->size - newfrag->ofs - newfrag->size);
+ if (unlikely(!newfrag2))
+ return -ENOMEM;
if (this->node)
this->node->frags++;
'this' to insert newfrag, and a tree insert
from newfrag to insert newfrag2. */
jffs2_fragtree_insert(newfrag, this);
- rb_insert_color(&newfrag->rb, list);
+ rb_insert_color(&newfrag->rb, root);
jffs2_fragtree_insert(newfrag2, newfrag);
- rb_insert_color(&newfrag2->rb, list);
+ rb_insert_color(&newfrag2->rb, root);
return 0;
}
/* Again, we know it lives down here in the tree */
jffs2_fragtree_insert(newfrag, this);
- rb_insert_color(&newfrag->rb, list);
+ rb_insert_color(&newfrag->rb, root);
} else {
/* New frag starts at the same point as 'this' used to. Replace
it in the tree without doing a delete and insertion */
JFFS2_DBG_FRAGTREE2("inserting newfrag (*%p),%d-%d in before 'this' (*%p),%d-%d\n",
newfrag, newfrag->ofs, newfrag->ofs+newfrag->size, this, this->ofs, this->ofs+this->size);
- rb_replace_node(&this->rb, &newfrag->rb, list);
+ rb_replace_node(&this->rb, &newfrag->rb, root);
if (newfrag->ofs + newfrag->size >= this->ofs+this->size) {
JFFS2_DBG_FRAGTREE2("obsoleting node frag %p (%x-%x)\n", this, this->ofs, this->ofs+this->size);
this->size -= newfrag->size;
jffs2_fragtree_insert(this, newfrag);
- rb_insert_color(&this->rb, list);
+ rb_insert_color(&this->rb, root);
return 0;
}
}
/* 'this' frag is obsoleted completely. */
JFFS2_DBG_FRAGTREE2("obsoleting node frag %p (%x-%x) and removing from tree\n",
this, this->ofs, this->ofs+this->size);
- rb_erase(&this->rb, list);
+ rb_erase(&this->rb, root);
jffs2_obsolete_node_frag(c, this);
}
/* Now we're pointing at the first frag which isn't totally obsoleted by
the new frag */
- if (!this || newfrag->ofs + newfrag->size == this->ofs) {
+ if (!this || newfrag->ofs + newfrag->size == this->ofs)
return 0;
- }
+
/* Still some overlap but we don't need to move it in the tree */
this->size = (this->ofs + this->size) - (newfrag->ofs + newfrag->size);
this->ofs = newfrag->ofs + newfrag->size;
return 0;
}
-/* Given an inode, probably with existing list of fragments, add the new node
- * to the fragment list.
+/*
+ * Given an inode, probably with existing tree of fragments, add the new node
+ * to the fragment tree.
*/
int jffs2_add_full_dnode_to_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_full_dnode *fn)
{
if (unlikely(!fn->size))
return 0;
- newfrag = jffs2_alloc_node_frag();
+ newfrag = new_fragment(fn, fn->ofs, fn->size);
if (unlikely(!newfrag))
return -ENOMEM;
+ newfrag->node->frags = 1;
JFFS2_DBG_FRAGTREE("adding node %#04x-%#04x @0x%08x on flash, newfrag *%p\n",
fn->ofs, fn->ofs+fn->size, ref_offset(fn->raw), newfrag);
- newfrag->ofs = fn->ofs;
- newfrag->size = fn->size;
- newfrag->node = fn;
- newfrag->node->frags = 1;
-
ret = jffs2_add_frag_to_fragtree(c, &f->fragtree, newfrag);
if (unlikely(ret))
return ret;
}
}
jffs2_dbg_fragtree_paranoia_check_nolock(f);
- jffs2_dbg_dump_fragtree_nolock(f);
+
+ return 0;
+}
+
+/*
+ * Check the data CRC of the node.
+ *
+ * Returns: 0 if the data CRC is correct;
+ * 1 - if incorrect;
+ * error code if an error occured.
+ */
+static int check_node_data(struct jffs2_sb_info *c, struct jffs2_tmp_dnode_info *tn)
+{
+ struct jffs2_raw_node_ref *ref = tn->fn->raw;
+ int err = 0, pointed = 0;
+ struct jffs2_eraseblock *jeb;
+ unsigned char *buffer;
+ uint32_t crc, ofs, retlen, len;
+
+ BUG_ON(tn->csize == 0);
+
+ /* Calculate how many bytes were already checked */
+ ofs = ref_offset(ref) + sizeof(struct jffs2_raw_inode);
+ len = ofs - (ofs & (PAGE_CACHE_SIZE - 1));
+ len = c->wbuf_pagesize - len;
+
+ if (len >= tn->csize) {
+ JFFS2_DBG_READINODE("no need to check node at %#08x, data length %u, data starts at %#08x - it has already been checked.\n",
+ ref_offset(ref), tn->csize, ofs);
+ goto adj_acc;
+ }
+
+ ofs += len;
+ len = tn->csize - len;
+
+ JFFS2_DBG_READINODE("check node at %#08x, data length %u, partial CRC %#08x, correct CRC %#08x, data starts at %#08x, start checking from %#08x - %u bytes.\n",
+ ref_offset(ref), tn->csize, tn->partial_crc, tn->data_crc, ofs - len, ofs, len);
+
+#ifndef __ECOS
+ /* TODO: instead, incapsulate point() stuff to jffs2_flash_read(),
+ * adding and jffs2_flash_read_end() interface. */
+ if (c->mtd->point) {
+ err = c->mtd->point(c->mtd, ofs, len, &retlen, &buffer);
+ if (!err && retlen < tn->csize) {
+ JFFS2_WARNING("MTD point returned len too short: %u instead of %u.\n", retlen, tn->csize);
+ c->mtd->unpoint(c->mtd, buffer, ofs, len);
+ } else if (err)
+ JFFS2_WARNING("MTD point failed: error code %d.\n", err);
+ else
+ pointed = 1; /* succefully pointed to device */
+ }
+#endif
+
+ if (!pointed) {
+ buffer = kmalloc(len, GFP_KERNEL);
+ if (unlikely(!buffer))
+ return -ENOMEM;
+
+ /* TODO: this is very frequent pattern, make it a separate
+ * routine */
+ err = jffs2_flash_read(c, ofs, len, &retlen, buffer);
+ if (err) {
+ JFFS2_ERROR("can not read %d bytes from 0x%08x, error code: %d.\n", len, ofs, err);
+ goto free_out;
+ }
+
+ if (retlen != len) {
+ JFFS2_ERROR("short read at %#08x: %d instead of %d.\n", ofs, retlen, len);
+ err = -EIO;
+ goto free_out;
+ }
+ }
+
+ /* Continue calculating CRC */
+ crc = crc32(tn->partial_crc, buffer, len);
+ if(!pointed)
+ kfree(buffer);
+#ifndef __ECOS
+ else
+ c->mtd->unpoint(c->mtd, buffer, ofs, len);
+#endif
+
+ if (crc != tn->data_crc) {
+ JFFS2_NOTICE("drong data CRC in data node at 0x%08x: read %#08x, calculated %#08x.\n",
+ ofs, tn->data_crc, crc);
+ return 1;
+ }
+
+adj_acc:
+ jeb = &c->blocks[ref->flash_offset / c->sector_size];
+ len = ref_totlen(c, jeb, ref);
+
+ /*
+ * Mark the node as having been checked and fix the
+ * accounting accordingly.
+ */
+ spin_lock(&c->erase_completion_lock);
+ jeb->used_size += len;
+ jeb->unchecked_size -= len;
+ c->used_size += len;
+ c->unchecked_size -= len;
+ spin_unlock(&c->erase_completion_lock);
+
return 0;
+
+free_out:
+ if(!pointed)
+ kfree(buffer);
+#ifndef __ECOS
+ else
+ c->mtd->unpoint(c->mtd, buffer, ofs, len);
+#endif
+ return err;
}
+/*
+ * Helper function for jffs2_add_older_frag_to_fragtree().
+ *
+ * Checks the node if we are in the checking stage.
+ */
+static inline int check_node(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_tmp_dnode_info *tn)
+{
+ int ret;
+
+ BUG_ON(ref_obsolete(tn->fn->raw));
+
+ /* We only check the data CRC of unchecked nodes */
+ if (ref_flags(tn->fn->raw) != REF_UNCHECKED)
+ return 0;
+
+ JFFS2_DBG_FRAGTREE2("check node %u-%u, phys offs %#08x.\n",
+ tn->fn->ofs, tn->fn->ofs + tn->fn->size,
+ ref_offset(tn->fn->raw));
+
+ ret = check_node_data(c, tn);
+ if (unlikely(ret < 0)) {
+ JFFS2_ERROR("check_node_data() returned error: %d.\n",
+ ret);
+ } else if (unlikely(ret > 0)) {
+ JFFS2_DBG_FRAGTREE2("CRC error, mark it obsolete.\n");
+ jffs2_mark_node_obsolete(c, tn->fn->raw);
+ }
+
+ return ret;
+}
+
+/*
+ * Helper function for jffs2_add_older_frag_to_fragtree().
+ *
+ * Called when the new fragment that is being inserted
+ * splits a hole fragment.
+ */
+static int split_hole(struct jffs2_sb_info *c, struct rb_root *root,
+ struct jffs2_node_frag *newfrag, struct jffs2_node_frag *hole)
+{
+ JFFS2_DBG_FRAGTREE2("fragment %#04x-%#04x splits the hole %#04x-%#04x\n",
+ newfrag->ofs, newfrag->ofs + newfrag->size, hole->ofs, hole->ofs + hole->size);
+
+ if (hole->ofs == newfrag->ofs) {
+ /*
+ * Well, the new fragment actually starts at the same offset as
+ * the hole.
+ */
+ if (hole->ofs + hole->size > newfrag->ofs + newfrag->size) {
+ /*
+ * We replace the overlapped left part of the hole by
+ * the new node.
+ */
+
+ JFFS2_DBG_FRAGTREE2("insert fragment %#04x-%#04x and cut the left part of the hole\n",
+ newfrag->ofs, newfrag->ofs + newfrag->size);
+ rb_replace_node(&hole->rb, &newfrag->rb, root);
+
+ hole->ofs += newfrag->size;
+ hole->size -= newfrag->size;
+
+ /*
+ * We know that 'hole' should be the right hand
+ * fragment.
+ */
+ jffs2_fragtree_insert(hole, newfrag);
+ rb_insert_color(&hole->rb, root);
+ } else {
+ /*
+ * Ah, the new fragment is of the same size as the hole.
+ * Relace the hole by it.
+ */
+ JFFS2_DBG_FRAGTREE2("insert fragment %#04x-%#04x and overwrite hole\n",
+ newfrag->ofs, newfrag->ofs + newfrag->size);
+ rb_replace_node(&hole->rb, &newfrag->rb, root);
+ jffs2_free_node_frag(hole);
+ }
+ } else {
+ /* The new fragment lefts some hole space at the left */
+
+ struct jffs2_node_frag * newfrag2 = NULL;
+
+ if (hole->ofs + hole->size > newfrag->ofs + newfrag->size) {
+ /* The new frag also lefts some space at the right */
+ newfrag2 = new_fragment(NULL, newfrag->ofs +
+ newfrag->size, hole->ofs + hole->size
+ - newfrag->ofs - newfrag->size);
+ if (unlikely(!newfrag2)) {
+ jffs2_free_node_frag(newfrag);
+ return -ENOMEM;
+ }
+ }
+
+ hole->size = newfrag->ofs - hole->ofs;
+ JFFS2_DBG_FRAGTREE2("left the hole %#04x-%#04x at the left and inserd fragment %#04x-%#04x\n",
+ hole->ofs, hole->ofs + hole->size, newfrag->ofs, newfrag->ofs + newfrag->size);
+
+ jffs2_fragtree_insert(newfrag, hole);
+ rb_insert_color(&newfrag->rb, root);
+
+ if (newfrag2) {
+ JFFS2_DBG_FRAGTREE2("left the hole %#04x-%#04x at the right\n",
+ newfrag2->ofs, newfrag2->ofs + newfrag2->size);
+ jffs2_fragtree_insert(newfrag2, newfrag);
+ rb_insert_color(&newfrag2->rb, root);
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * This function is used when we build inode. It expects the nodes are passed
+ * in the decreasing version order. The whole point of this is to improve the
+ * inodes checking on NAND: we check the nodes' data CRC only when they are not
+ * obsoleted. Previously, add_frag_to_fragtree() function was used and
+ * nodes were passed to it in the increasing version ordes and CRCs of all
+ * nodes were checked.
+ *
+ * Note: tn->fn->size shouldn't be zero.
+ *
+ * Returns 0 if the node was inserted
+ * 1 if it wasn't inserted (since it is obsolete)
+ * < 0 an if error occured
+ */
+int jffs2_add_older_frag_to_fragtree(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
+ struct jffs2_tmp_dnode_info *tn)
+{
+ struct jffs2_node_frag *this, *newfrag;
+ uint32_t lastend;
+ struct jffs2_full_dnode *fn = tn->fn;
+ struct rb_root *root = &f->fragtree;
+ uint32_t fn_size = fn->size, fn_ofs = fn->ofs;
+ int err, checked = 0;
+ int ref_flag;
+
+ JFFS2_DBG_FRAGTREE("insert fragment %#04x-%#04x\n", fn_ofs, fn_ofs + fn_size);
+
+ /* Skip all the nodes which are completed before this one starts */
+ this = jffs2_lookup_node_frag(root, fn_ofs);
+ if (this)
+ JFFS2_DBG_FRAGTREE2("'this' found %#04x-%#04x (%s)\n", this->ofs, this->ofs + this->size, this->node ? "data" : "hole");
+
+ if (this)
+ lastend = this->ofs + this->size;
+ else
+ lastend = 0;
+
+ /* Detect the preliminary type of node */
+ if (fn->size >= PAGE_CACHE_SIZE)
+ ref_flag = REF_PRISTINE;
+ else
+ ref_flag = REF_NORMAL;
+
+ /* See if we ran off the end of the root */
+ if (lastend <= fn_ofs) {
+ /* We did */
+
+ /*
+ * We are going to insert the new node into the
+ * fragment tree, so check it.
+ */
+ err = check_node(c, f, tn);
+ if (err != 0)
+ return err;
+
+ fn->frags = 1;
+
+ newfrag = new_fragment(fn, fn_ofs, fn_size);
+ if (unlikely(!newfrag))
+ return -ENOMEM;
+
+ err = no_overlapping_node(c, root, newfrag, this, lastend);
+ if (unlikely(err != 0)) {
+ jffs2_free_node_frag(newfrag);
+ return err;
+ }
+
+ goto out_ok;
+ }
+
+ fn->frags = 0;
+
+ while (1) {
+ /*
+ * Here we have:
+ * fn_ofs < this->ofs + this->size && fn_ofs >= this->ofs.
+ *
+ * Remember, 'this' has higher version, any non-hole node
+ * which is already in the fragtree is newer then the newly
+ * inserted.
+ */
+ if (!this->node) {
+ /*
+ * 'this' is the hole fragment, so at least the
+ * beginning of the new fragment is valid.
+ */
+
+ /*
+ * We are going to insert the new node into the
+ * fragment tree, so check it.
+ */
+ if (!checked) {
+ err = check_node(c, f, tn);
+ if (unlikely(err != 0))
+ return err;
+ checked = 1;
+ }
+
+ if (this->ofs + this->size >= fn_ofs + fn_size) {
+ /* We split the hole on two parts */
+
+ fn->frags += 1;
+ newfrag = new_fragment(fn, fn_ofs, fn_size);
+ if (unlikely(!newfrag))
+ return -ENOMEM;
+
+ err = split_hole(c, root, newfrag, this);
+ if (unlikely(err))
+ return err;
+ goto out_ok;
+ }
+
+ /*
+ * The beginning of the new fragment is valid since it
+ * overlaps the hole node.
+ */
+
+ ref_flag = REF_NORMAL;
+
+ fn->frags += 1;
+ newfrag = new_fragment(fn, fn_ofs,
+ this->ofs + this->size - fn_ofs);
+ if (unlikely(!newfrag))
+ return -ENOMEM;
+
+ if (fn_ofs == this->ofs) {
+ /*
+ * The new node starts at the same offset as
+ * the hole and supersieds the hole.
+ */
+ JFFS2_DBG_FRAGTREE2("add the new fragment instead of hole %#04x-%#04x, refcnt %d\n",
+ fn_ofs, fn_ofs + this->ofs + this->size - fn_ofs, fn->frags);
+
+ rb_replace_node(&this->rb, &newfrag->rb, root);
+ jffs2_free_node_frag(this);
+ } else {
+ /*
+ * The hole becomes shorter as its right part
+ * is supersieded by the new fragment.
+ */
+ JFFS2_DBG_FRAGTREE2("reduce size of hole %#04x-%#04x to %#04x-%#04x\n",
+ this->ofs, this->ofs + this->size, this->ofs, this->ofs + this->size - newfrag->size);
+
+ JFFS2_DBG_FRAGTREE2("add new fragment %#04x-%#04x, refcnt %d\n", fn_ofs,
+ fn_ofs + this->ofs + this->size - fn_ofs, fn->frags);
+
+ this->size -= newfrag->size;
+ jffs2_fragtree_insert(newfrag, this);
+ rb_insert_color(&newfrag->rb, root);
+ }
+
+ fn_ofs += newfrag->size;
+ fn_size -= newfrag->size;
+ this = rb_entry(rb_next(&newfrag->rb),
+ struct jffs2_node_frag, rb);
+
+ JFFS2_DBG_FRAGTREE2("switch to the next 'this' fragment: %#04x-%#04x %s\n",
+ this->ofs, this->ofs + this->size, this->node ? "(data)" : "(hole)");
+ }
+
+ /*
+ * 'This' node is not the hole so it obsoletes the new fragment
+ * either fully or partially.
+ */
+ if (this->ofs + this->size >= fn_ofs + fn_size) {
+ /* The new node is obsolete, drop it */
+ if (fn->frags == 0) {
+ JFFS2_DBG_FRAGTREE2("%#04x-%#04x is obsolete, mark it obsolete\n", fn_ofs, fn_ofs + fn_size);
+ ref_flag = REF_OBSOLETE;
+ }
+ goto out_ok;
+ } else {
+ struct jffs2_node_frag *new_this;
+
+ /* 'This' node obsoletes the beginning of the new node */
+ JFFS2_DBG_FRAGTREE2("the beginning %#04x-%#04x is obsolete\n", fn_ofs, this->ofs + this->size);
+
+ ref_flag = REF_NORMAL;
+
+ fn_size -= this->ofs + this->size - fn_ofs;
+ fn_ofs = this->ofs + this->size;
+ JFFS2_DBG_FRAGTREE2("now considering %#04x-%#04x\n", fn_ofs, fn_ofs + fn_size);
+
+ new_this = rb_entry(rb_next(&this->rb), struct jffs2_node_frag, rb);
+ if (!new_this) {
+ /*
+ * There is no next fragment. Add the rest of
+ * the new node as the right-hand child.
+ */
+ if (!checked) {
+ err = check_node(c, f, tn);
+ if (unlikely(err != 0))
+ return err;
+ checked = 1;
+ }
+
+ fn->frags += 1;
+ newfrag = new_fragment(fn, fn_ofs, fn_size);
+ if (unlikely(!newfrag))
+ return -ENOMEM;
+
+ JFFS2_DBG_FRAGTREE2("there are no more fragments, insert %#04x-%#04x\n",
+ newfrag->ofs, newfrag->ofs + newfrag->size);
+ rb_link_node(&newfrag->rb, &this->rb, &this->rb.rb_right);
+ rb_insert_color(&newfrag->rb, root);
+ goto out_ok;
+ } else {
+ this = new_this;
+ JFFS2_DBG_FRAGTREE2("switch to the next 'this' fragment: %#04x-%#04x %s\n",
+ this->ofs, this->ofs + this->size, this->node ? "(data)" : "(hole)");
+ }
+ }
+ }
+
+out_ok:
+ BUG_ON(fn->size < PAGE_CACHE_SIZE && ref_flag == REF_PRISTINE);
+
+ if (ref_flag == REF_OBSOLETE) {
+ JFFS2_DBG_FRAGTREE2("the node is obsolete now\n");
+ /* jffs2_mark_node_obsolete() will adjust space accounting */
+ jffs2_mark_node_obsolete(c, fn->raw);
+ return 1;
+ }
+
+ JFFS2_DBG_FRAGTREE2("the node is \"%s\" now\n", ref_flag == REF_NORMAL ? "REF_NORMAL" : "REF_PRISTINE");
+
+ /* Space accounting was adjusted at check_node_data() */
+ spin_lock(&c->erase_completion_lock);
+ fn->raw->flash_offset = ref_offset(fn->raw) | ref_flag;
+ spin_unlock(&c->erase_completion_lock);
+
+ return 0;
+}
void jffs2_set_inocache_state(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, int state)
{
*
* For licensing information, see the file 'LICENCE' in this directory.
*
- * $Id: readinode.c,v 1.134 2005/07/31 08:20:44 dedekind Exp $
+ * $Id: readinode.c,v 1.135 2005/08/01 12:05:19 dedekind Exp $
*
*/
#include <linux/compiler.h>
#include "nodelist.h"
-/*
- * Put a new tmp_dnode_info into the temporaty RB-tree, keeping the list in
+/*
+ * Put a new tmp_dnode_info into the temporaty RB-tree, keeping the list in
* order of increasing version.
*/
static void jffs2_add_tn_to_tree(struct jffs2_tmp_dnode_info *tn, struct rb_root *list)
/* There may actually be a collision here, but it doesn't
actually matter. As long as the two nodes with the same
version are together, it's all fine. */
- if (tn->version < this->version)
+ if (tn->version > this->version)
p = &(*p)->rb_left;
else
p = &(*p)->rb_right;
- }
+ }
rb_link_node(&tn->rb, parent, p);
rb_insert_color(&tn->rb, list);
* 1 if the node should be marked obsolete;
* negative error code on failure.
*/
-static inline int
-read_direntry(struct jffs2_sb_info *c,
- struct jffs2_raw_node_ref *ref,
- struct jffs2_raw_dirent *rd,
- uint32_t read,
- struct jffs2_full_dirent **fdp,
- int32_t *latest_mctime,
- uint32_t *mctime_ver)
+static inline int read_direntry(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref,
+ struct jffs2_raw_dirent *rd, uint32_t read, struct jffs2_full_dirent **fdp,
+ uint32_t *latest_mctime, uint32_t *mctime_ver)
{
struct jffs2_full_dirent *fd;
* 1 if the node should be marked obsolete;
* negative error code on failure.
*/
-static inline int
-read_dnode(struct jffs2_sb_info *c,
- struct jffs2_raw_node_ref *ref,
- struct jffs2_raw_inode *rd,
- uint32_t read,
- struct rb_root *tnp,
- int32_t *latest_mctime,
- uint32_t *mctime_ver)
+static inline int read_dnode(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref,
+ struct jffs2_raw_inode *rd, struct rb_root *tnp, int rdlen,
+ uint32_t *latest_mctime, uint32_t *mctime_ver)
{
- struct jffs2_eraseblock *jeb;
struct jffs2_tmp_dnode_info *tn;
+ uint32_t len, csize;
+ int ret = 1;
/* Obsoleted. This cannot happen, surely? dwmw2 20020308 */
BUG_ON(ref_obsolete(ref));
+ tn = jffs2_alloc_tmp_dnode_info();
+ if (!tn) {
+ JFFS2_ERROR("failed to allocate tn (%d bytes).\n", sizeof(*tn));
+ return -ENOMEM;
+ }
+
+ tn->partial_crc = 0;
+ csize = je32_to_cpu(rd->csize);
+
/* If we've never checked the CRCs on this node, check them now */
if (ref_flags(ref) == REF_UNCHECKED) {
- uint32_t crc, len;
+ uint32_t crc;
crc = crc32(0, rd, sizeof(*rd) - 8);
if (unlikely(crc != je32_to_cpu(rd->node_crc))) {
JFFS2_NOTICE("header CRC failed on node at %#08x: read %#08x, calculated %#08x\n",
ref_offset(ref), je32_to_cpu(rd->node_crc), crc);
- return 1;
+ goto free_out;
}
/* Sanity checks */
unlikely(PAD(je32_to_cpu(rd->csize) + sizeof(*rd)) != PAD(je32_to_cpu(rd->totlen)))) {
JFFS2_WARNING("inode node header CRC is corrupted at %#08x\n", ref_offset(ref));
jffs2_dbg_dump_node(c, ref_offset(ref));
- return 1;
+ goto free_out;
}
- if (rd->compr != JFFS2_COMPR_ZERO && je32_to_cpu(rd->csize)) {
- unsigned char *buf = NULL;
- uint32_t pointed = 0;
- int err;
-#ifndef __ECOS
- if (c->mtd->point) {
- err = c->mtd->point (c->mtd, ref_offset(ref) + sizeof(*rd), je32_to_cpu(rd->csize),
- &read, &buf);
- if (unlikely(read < je32_to_cpu(rd->csize)) && likely(!err)) {
- JFFS2_ERROR("MTD point returned len too short: 0x%zx\n", read);
- c->mtd->unpoint(c->mtd, buf, ref_offset(ref) + sizeof(*rd),
- je32_to_cpu(rd->csize));
- } else if (unlikely(err)){
- JFFS2_ERROR("MTD point failed %d\n", err);
- } else
- pointed = 1; /* succefully pointed to device */
- }
-#endif
- if(!pointed){
- buf = kmalloc(je32_to_cpu(rd->csize), GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
-
- err = jffs2_flash_read(c, ref_offset(ref) + sizeof(*rd), je32_to_cpu(rd->csize),
- &read, buf);
- if (unlikely(read != je32_to_cpu(rd->csize)) && likely(!err))
- err = -EIO;
- if (err) {
- kfree(buf);
- return err;
- }
- }
- crc = crc32(0, buf, je32_to_cpu(rd->csize));
- if(!pointed)
- kfree(buf);
-#ifndef __ECOS
- else
- c->mtd->unpoint(c->mtd, buf, ref_offset(ref) + sizeof(*rd), je32_to_cpu(rd->csize));
-#endif
-
- if (crc != je32_to_cpu(rd->data_crc)) {
- JFFS2_NOTICE("data CRC failed on node at %#08x: read %#08x, calculated %#08x\n",
- ref_offset(ref), je32_to_cpu(rd->data_crc), crc);
- return 1;
- }
+ if (jffs2_is_writebuffered(c) && csize != 0) {
+ /* At this point we are supposed to check the data CRC
+ * of our unchecked node. But thus far, we do not
+ * know whether the node is valid or obsolete. To
+ * figure this out, we need to walk all the nodes of
+ * the inode and build the inode fragtree. We don't
+ * want to spend time checking data of nodes which may
+ * later be found to be obsolete. So we put off the full
+ * data CRC checking until we have read all the inode
+ * nodes and have started building the fragtree.
+ *
+ * The fragtree is being built starting with nodes
+ * having the highest version number, so we'll be able
+ * to detect whether a node is valid (i.e., it is not
+ * overlapped by a node with higher version) or not.
+ * And we'll be able to check only those nodes, which
+ * are not obsolete.
+ *
+ * Of course, this optimization only makes sense in case
+ * of NAND flashes (or other flashes whith
+ * !jffs2_can_mark_obsolete()), since on NOR flashes
+ * nodes are marked obsolete physically.
+ *
+ * Since NAND flashes (or other flashes with
+ * jffs2_is_writebuffered(c)) are anyway read by
+ * fractions of c->wbuf_pagesize, and we have just read
+ * the node header, it is likely that the starting part
+ * of the node data is also read when we read the
+ * header. So we don't mind to check the CRC of the
+ * starting part of the data of the node now, and check
+ * the second part later (in jffs2_check_node_data()).
+ * Of course, we will not need to re-read and re-check
+ * the NAND page which we have just read. This is why we
+ * read the whole NAND page at jffs2_get_inode_nodes(),
+ * while we needed only the node header.
+ */
+ unsigned char *buf;
+
+ /* 'buf' will point to the start of data */
+ buf = (unsigned char *)rd + sizeof(*rd);
+ /* len will be the read data length */
+ len = min_t(uint32_t, rdlen - sizeof(*rd), csize);
- }
-
- /* Mark the node as having been checked and fix the accounting accordingly */
- jeb = &c->blocks[ref->flash_offset / c->sector_size];
- len = ref_totlen(c, jeb, ref);
-
- spin_lock(&c->erase_completion_lock);
- jeb->used_size += len;
- jeb->unchecked_size -= len;
- c->used_size += len;
- c->unchecked_size -= len;
-
- /* If node covers at least a whole page, or if it starts at the
- beginning of a page and runs to the end of the file, or if
- it's a hole node, mark it REF_PRISTINE, else REF_NORMAL.
+ if (len)
+ tn->partial_crc = crc = crc32(0, buf, len);
+
+ /* If we actually calculated the whole data CRC
+ * and it is wrong, drop the node. */
+ if (unlikely(tn->partial_crc
+ != je32_to_cpu(rd->data_crc)) &&
+ len == csize)
+ goto free_out;
- If it's actually overlapped, it'll get made NORMAL (or OBSOLETE)
- when the overlapping node(s) get added to the tree anyway.
- */
- if ((je32_to_cpu(rd->dsize) >= PAGE_CACHE_SIZE) ||
- ( ((je32_to_cpu(rd->offset) & (PAGE_CACHE_SIZE-1))==0) &&
- (je32_to_cpu(rd->dsize) + je32_to_cpu(rd->offset) == je32_to_cpu(rd->isize)))) {
- JFFS2_DBG_READINODE("marking node at %#08x REF_PRISTINE\n", ref_offset(ref));
- ref->flash_offset = ref_offset(ref) | REF_PRISTINE;
- } else {
- JFFS2_DBG_READINODE("marking node at %#08x REF_NORMAL\n", ref_offset(ref));
+ } else if (csize == 0) {
+ /*
+ * We checked the header CRC. If the node has no data, adjust
+ * the space accounting now. For other nodes this will be done
+ * later either when the node is marked obsolete or when its
+ * data is checked.
+ */
+ struct jffs2_eraseblock *jeb;
+
+ JFFS2_DBG_READINODE("the node has no data.\n");
+ jeb = &c->blocks[ref->flash_offset / c->sector_size];
+ len = ref_totlen(c, jeb, ref);
+
+ spin_lock(&c->erase_completion_lock);
+ jeb->used_size += len;
+ jeb->unchecked_size -= len;
+ c->used_size += len;
+ c->unchecked_size -= len;
ref->flash_offset = ref_offset(ref) | REF_NORMAL;
+ spin_unlock(&c->erase_completion_lock);
}
- spin_unlock(&c->erase_completion_lock);
- }
-
- tn = jffs2_alloc_tmp_dnode_info();
- if (!tn) {
- JFFS2_ERROR("alloc tn failed\n");
- return -ENOMEM;
}
tn->fn = jffs2_alloc_full_dnode();
if (!tn->fn) {
JFFS2_ERROR("alloc fn failed\n");
- jffs2_free_tmp_dnode_info(tn);
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto free_out;
}
tn->version = je32_to_cpu(rd->version);
tn->fn->ofs = je32_to_cpu(rd->offset);
+ tn->data_crc = je32_to_cpu(rd->data_crc);
+ tn->csize = csize;
tn->fn->raw = ref;
/* There was a bug where we wrote hole nodes out with
csize/dsize swapped. Deal with it */
- if (rd->compr == JFFS2_COMPR_ZERO && !je32_to_cpu(rd->dsize) && je32_to_cpu(rd->csize))
- tn->fn->size = je32_to_cpu(rd->csize);
+ if (rd->compr == JFFS2_COMPR_ZERO && !je32_to_cpu(rd->dsize) && csize)
+ tn->fn->size = csize;
else // normal case...
tn->fn->size = je32_to_cpu(rd->dsize);
jffs2_add_tn_to_tree(tn, tnp);
return 0;
+
+free_out:
+ jffs2_free_tmp_dnode_info(tn);
+ return ret;
}
/*
* 1 if the node should be marked obsolete;
* negative error code on failure.
*/
-static inline int
-read_unknown(struct jffs2_sb_info *c,
- struct jffs2_raw_node_ref *ref,
- struct jffs2_unknown_node *un,
- uint32_t read)
+static inline int read_unknown(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref, struct jffs2_unknown_node *un)
{
/* We don't mark unknown nodes as REF_UNCHECKED */
BUG_ON(ref_flags(ref) == REF_UNCHECKED);
return 0;
}
+/*
+ * Helper function for jffs2_get_inode_nodes().
+ * The function detects whether more data should be read and reads it if yes.
+ *
+ * Returns: 0 on succes;
+ * negative error code on failure.
+ */
+static int read_more(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref,
+ int right_size, int *rdlen, unsigned char *buf, unsigned char *bufstart)
+{
+ int right_len, err, len;
+ size_t retlen;
+ uint32_t offs;
+
+ if (jffs2_is_writebuffered(c)) {
+ right_len = c->wbuf_pagesize - (bufstart - buf);
+ if (right_size + (int)(bufstart - buf) > c->wbuf_pagesize)
+ right_len += c->wbuf_pagesize;
+ } else
+ right_len = right_size;
+
+ if (*rdlen == right_len)
+ return 0;
+
+ /* We need to read more data */
+ offs = ref_offset(ref) + *rdlen;
+ if (jffs2_is_writebuffered(c)) {
+ bufstart = buf + c->wbuf_pagesize;
+ len = c->wbuf_pagesize;
+ } else {
+ bufstart = buf + *rdlen;
+ len = right_size - *rdlen;
+ }
+
+ JFFS2_DBG_READINODE("read more %d bytes.", len);
+
+ err = jffs2_flash_read(c, offs, len, &retlen, bufstart);
+ if (err) {
+ JFFS2_ERROR("can not read %d bytes from 0x%08x, "
+ "error code: %d.\n", len, offs, err);
+ return err;
+ }
+
+ if (retlen < len) {
+ JFFS2_ERROR("short read at %#08x: %d instead of %d.\n",
+ offs, retlen, len);
+ return -EIO;
+ }
+
+ *rdlen = right_len;
+
+ return 0;
+}
+
/* Get tmp_dnode_info and full_dirent for all non-obsolete nodes associated
with this ino, returning the former in order of version */
-
static int jffs2_get_inode_nodes(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
struct rb_root *tnp, struct jffs2_full_dirent **fdp,
uint32_t *highest_version, uint32_t *latest_mctime,
struct jffs2_raw_node_ref *ref, *valid_ref;
struct rb_root ret_tn = RB_ROOT;
struct jffs2_full_dirent *ret_fd = NULL;
- union jffs2_node_union node;
+ unsigned char *buf = NULL;
+ union jffs2_node_union *node;
size_t retlen;
- int err;
+ int len, err;
*mctime_ver = 0;
JFFS2_DBG_READINODE("ino #%u\n", f->inocache->ino);
- spin_lock(&c->erase_completion_lock);
+ if (jffs2_is_writebuffered(c)) {
+ /*
+ * If we have the write buffer, we assume the minimal I/O unit
+ * is c->wbuf_pagesize. We implement some optimizations which in
+ * this case and we need a temporary buffer of size =
+ * 2*c->wbuf_pagesize bytes (see comments in read_dnode()).
+ * Basically, we want to read not only the node header, but the
+ * whole wbuf (NAND page in case of NAND) or 2, if the node
+ * header overlaps the border between the 2 wbufs.
+ */
+ len = 2*c->wbuf_pagesize;
+ } else {
+ /*
+ * When there is no write buffer, the size of the temporary
+ * buffer is the size of the larges node header.
+ */
+ len = sizeof(union jffs2_node_union);
+ }
+ /* FIXME: in case of NOR and available ->point() this
+ * needs to be fixed. */
+ buf = kmalloc(len, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ spin_lock(&c->erase_completion_lock);
valid_ref = jffs2_first_valid_node(f->inocache->nodes);
-
- if (!valid_ref && (f->inocache->ino != 1))
- JFFS2_WARNING("no valid nodes for ino #%u\n", f->inocache->ino);
-
+ if (!valid_ref && f->inocache->ino != 1)
+ JFFS2_WARNING("Eep. No valid nodes for ino #%u.\n", f->inocache->ino);
while (valid_ref) {
+ unsigned char *bufstart;
+
/* We can hold a pointer to a non-obsolete node without the spinlock,
but _obsolete_ nodes may disappear at any time, if the block
they're in gets erased. So if we mark 'ref' obsolete while we're
cond_resched();
+ /*
+ * At this point we don't know the type of the node we're going
+ * to read, so we do not know the size of its header. In order
+ * to minimize the amount of flash IO we assume the node has
+ * size = JFFS2_MIN_NODE_HEADER.
+ */
+ if (jffs2_is_writebuffered(c)) {
+ /*
+ * We treat 'buf' as 2 adjacent wbufs. We want to
+ * adjust bufstart such as it points to the
+ * beginning of the node within this wbuf.
+ */
+ bufstart = buf + (ref_offset(ref) % c->wbuf_pagesize);
+ /* We will read either one wbuf or 2 wbufs. */
+ len = c->wbuf_pagesize - (bufstart - buf);
+ if (JFFS2_MIN_NODE_HEADER +
+ (int)(bufstart - buf) > c->wbuf_pagesize) {
+ /* The header spans the border of the
+ * first wbuf */
+ len += c->wbuf_pagesize;
+ }
+ } else {
+ bufstart = buf;
+ len = JFFS2_MIN_NODE_HEADER;
+ }
+
+ JFFS2_DBG_READINODE("read %d bytes at %#08x(%d).\n", len, ref_offset(ref), ref_flags(ref));
+
/* FIXME: point() */
- err = jffs2_flash_read(c, (ref_offset(ref)),
- min_t(uint32_t, ref_totlen(c, NULL, ref), sizeof(node)),
- &retlen, (void *)&node);
+ err = jffs2_flash_read(c, ref_offset(ref), len,
+ &retlen, bufstart);
if (err) {
- JFFS2_ERROR("error %d reading node at 0x%08x in get_inode_nodes()\n", err, ref_offset(ref));
+ JFFS2_ERROR("can not read %d bytes from 0x%08x, " "error code: %d.\n", len, ref_offset(ref), err);
+ goto free_out;
+ }
+
+ if (retlen < len) {
+ JFFS2_ERROR("short read at %#08x: %d instead of %d.\n", ref_offset(ref), retlen, len);
+ err = -EIO;
goto free_out;
}
+
+ node = (union jffs2_node_union *)bufstart;
- switch (je16_to_cpu(node.u.nodetype)) {
+ switch (je16_to_cpu(node->u.nodetype)) {
case JFFS2_NODETYPE_DIRENT:
- JFFS2_DBG_READINODE("node at %08x (%d) is a dirent node\n", ref_offset(ref), ref_flags(ref));
-
- if (retlen < sizeof(node.d)) {
- JFFS2_ERROR("short read dirent at %#08x\n", ref_offset(ref));
- err = -EIO;
- goto free_out;
- }
- err = read_direntry(c, ref, &node.d, retlen, &ret_fd, latest_mctime, mctime_ver);
+ if (JFFS2_MIN_NODE_HEADER < sizeof(struct jffs2_raw_dirent)) {
+ err = read_more(c, ref, sizeof(struct jffs2_raw_dirent), &len, buf, bufstart);
+ if (unlikely(err))
+ goto free_out;
+ }
+
+ err = read_direntry(c, ref, &node->d, retlen, &ret_fd, latest_mctime, mctime_ver);
if (err == 1) {
jffs2_mark_node_obsolete(c, ref);
break;
} else if (unlikely(err))
goto free_out;
- if (je32_to_cpu(node.d.version) > *highest_version)
- *highest_version = je32_to_cpu(node.d.version);
+ if (je32_to_cpu(node->d.version) > *highest_version)
+ *highest_version = je32_to_cpu(node->d.version);
break;
case JFFS2_NODETYPE_INODE:
- JFFS2_DBG_READINODE("node at %08x (%d) is a data node\n", ref_offset(ref), ref_flags(ref));
- if (retlen < sizeof(node.i)) {
- JFFS2_ERROR("short read dnode at %#08x\n", ref_offset(ref));
- err = -EIO;
- goto free_out;
+ if (JFFS2_MIN_NODE_HEADER < sizeof(struct jffs2_raw_inode)) {
+ err = read_more(c, ref, sizeof(struct jffs2_raw_inode), &len, buf, bufstart);
+ if (unlikely(err))
+ goto free_out;
}
- err = read_dnode(c, ref, &node.i, retlen, &ret_tn, latest_mctime, mctime_ver);
+ err = read_dnode(c, ref, &node->i, &ret_tn, len, latest_mctime, mctime_ver);
if (err == 1) {
jffs2_mark_node_obsolete(c, ref);
break;
} else if (unlikely(err))
goto free_out;
- if (je32_to_cpu(node.i.version) > *highest_version)
- *highest_version = je32_to_cpu(node.i.version);
+ if (je32_to_cpu(node->i.version) > *highest_version)
+ *highest_version = je32_to_cpu(node->i.version);
- JFFS2_DBG_READINODE("version %d, highest_version now %d\n",
- je32_to_cpu(node.i.version), *highest_version);
-
break;
default:
- /* Check we've managed to read at least the common node header */
- if (retlen < sizeof(struct jffs2_unknown_node)) {
- JFFS2_ERROR("short read unknown node at %#08x\n", ref_offset(ref));
- return -EIO;
+ if (JFFS2_MIN_NODE_HEADER < sizeof(struct jffs2_unknown_node)) {
+ err = read_more(c, ref, sizeof(struct jffs2_unknown_node), &len, buf, bufstart);
+ if (unlikely(err))
+ goto free_out;
}
-
- err = read_unknown(c, ref, &node.u, retlen);
+
+ err = read_unknown(c, ref, &node->u);
if (err == 1) {
jffs2_mark_node_obsolete(c, ref);
break;
}
spin_lock(&c->erase_completion_lock);
-
}
+
spin_unlock(&c->erase_completion_lock);
*tnp = ret_tn;
*fdp = ret_fd;
+ kfree(buf);
+ JFFS2_DBG_READINODE("nodes of inode #%u were read, the highest version is %u, latest_mctime %u, mctime_ver %u.\n",
+ f->inocache->ino, *highest_version, *latest_mctime, *mctime_ver);
return 0;
free_out:
jffs2_free_tmp_dnode_info_list(&ret_tn);
jffs2_free_full_dirent_list(ret_fd);
+ kfree(buf);
return err;
}
struct jffs2_inode_info *f,
struct jffs2_raw_inode *latest_node)
{
- struct jffs2_tmp_dnode_info *tn = NULL;
+ struct jffs2_tmp_dnode_info *tn;
struct rb_root tn_list;
struct rb_node *rb, *repl_rb;
struct jffs2_full_dirent *fd_list;
- struct jffs2_full_dnode *fn = NULL;
+ struct jffs2_full_dnode *fn, *first_fn = NULL;
uint32_t crc;
uint32_t latest_mctime, mctime_ver;
- uint32_t mdata_ver = 0;
size_t retlen;
int ret;
rb = rb_first(&tn_list);
while (rb) {
+ cond_resched();
tn = rb_entry(rb, struct jffs2_tmp_dnode_info, rb);
fn = tn->fn;
-
- if (f->metadata) {
- if (likely(tn->version >= mdata_ver)) {
- JFFS2_DBG_READINODE("obsoleting old metadata at 0x%08x\n", ref_offset(f->metadata->raw));
- jffs2_mark_node_obsolete(c, f->metadata->raw);
- jffs2_free_full_dnode(f->metadata);
- f->metadata = NULL;
-
- mdata_ver = 0;
- } else {
- /* This should never happen. */
- JFFS2_ERROR("Er. New metadata at 0x%08x with ver %d is actually older than previous ver %d at 0x%08x\n",
- ref_offset(fn->raw), tn->version, mdata_ver, ref_offset(f->metadata->raw));
- jffs2_mark_node_obsolete(c, fn->raw);
- jffs2_free_full_dnode(fn);
- /* Fill in latest_node from the metadata, not this one we're about to free... */
- fn = f->metadata;
- goto next_tn;
- }
- }
+ ret = 1;
+ JFFS2_DBG_READINODE("consider node ver %u, phys offset "
+ "%#08x(%d), range %u-%u.\n", tn->version,
+ ref_offset(fn->raw), ref_flags(fn->raw),
+ fn->ofs, fn->ofs + fn->size);
if (fn->size) {
- jffs2_add_full_dnode_to_inode(c, f, fn);
- } else {
- /* Zero-sized node at end of version list. Just a metadata update */
- JFFS2_DBG_READINODE("metadata @%08x: ver %d\n", ref_offset(fn->raw), tn->version);
+ ret = jffs2_add_older_frag_to_fragtree(c, f, tn);
+ /* TODO: the error code isn't checked, check it */
+ jffs2_dbg_fragtree_paranoia_check_nolock(f);
+ BUG_ON(ret < 0);
+ if (!first_fn && ret == 0)
+ first_fn = fn;
+ } else if (!first_fn) {
+ first_fn = fn;
f->metadata = fn;
- mdata_ver = tn->version;
- }
- next_tn:
+ ret = 0; /* Prevent freeing the metadata update node */
+ } else
+ jffs2_mark_node_obsolete(c, fn->raw);
+
BUG_ON(rb->rb_left);
if (rb->rb_parent && rb->rb_parent->rb_left == rb) {
/* We were then left-hand child of our parent. We need
- to move our own right-hand child into our place. */
+ * to move our own right-hand child into our place. */
repl_rb = rb->rb_right;
if (repl_rb)
repl_rb->rb_parent = rb->rb_parent;
rb = rb_next(rb);
/* Remove the spent tn from the tree; don't bother rebalancing
- but put our right-hand child in our own place. */
+ * but put our right-hand child in our own place. */
if (tn->rb.rb_parent) {
if (tn->rb.rb_parent->rb_left == &tn->rb)
tn->rb.rb_parent->rb_left = repl_rb;
tn->rb.rb_right->rb_parent = NULL;
jffs2_free_tmp_dnode_info(tn);
+ if (ret) {
+ JFFS2_DBG_READINODE("delete dnode %u-%u.\n",
+ fn->ofs, fn->ofs + fn->size);
+ jffs2_free_full_dnode(fn);
+ }
}
jffs2_dbg_fragtree_paranoia_check_nolock(f);
- if (!fn) {
+ BUG_ON(first_fn && ref_obsolete(first_fn->raw));
+
+ fn = first_fn;
+ if (unlikely(!first_fn)) {
/* No data nodes for this inode. */
if (f->inocache->ino != 1) {
JFFS2_WARNING("no data nodes found for ino #%u\n", f->inocache->ino);
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff