diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/jffs2/nodelist.c | 637 | ||||
| -rw-r--r-- | fs/jffs2/nodelist.h | 9 | ||||
| -rw-r--r-- | fs/jffs2/readinode.c | 475 |
3 files changed, 868 insertions, 253 deletions
diff --git a/fs/jffs2/nodelist.c b/fs/jffs2/nodelist.c index 0cf5e6f1198..390ce06ab1a 100644 --- a/fs/jffs2/nodelist.c +++ b/fs/jffs2/nodelist.c @@ -7,7 +7,7 @@ * * 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 $ * */ @@ -59,7 +59,7 @@ void jffs2_truncate_fragtree(struct jffs2_sb_info *c, struct rb_root *list, uint /* 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; } @@ -73,6 +73,20 @@ void jffs2_truncate_fragtree(struct jffs2_sb_info *c, struct rb_root *list, uint 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) @@ -120,14 +134,82 @@ static void jffs2_fragtree_insert(struct jffs2_node_frag *newfrag, struct jffs2_ 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", @@ -138,7 +220,7 @@ static int jffs2_add_frag_to_fragtree(struct jffs2_sb_info *c, struct rb_root *l 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 */ @@ -152,45 +234,16 @@ static int jffs2_add_frag_to_fragtree(struct jffs2_sb_info *c, struct rb_root *l 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 @@ -206,11 +259,8 @@ static int jffs2_add_frag_to_fragtree(struct jffs2_sb_info *c, struct rb_root *l 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)); @@ -219,9 +269,10 @@ static int jffs2_add_frag_to_fragtree(struct jffs2_sb_info *c, struct rb_root *l 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++; @@ -235,10 +286,10 @@ static int jffs2_add_frag_to_fragtree(struct jffs2_sb_info *c, struct rb_root *l '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; } @@ -247,14 +298,14 @@ static int jffs2_add_frag_to_fragtree(struct jffs2_sb_info *c, struct rb_root *l /* 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); @@ -264,7 +315,7 @@ static int jffs2_add_frag_to_fragtree(struct jffs2_sb_info *c, struct rb_root *l this->size -= newfrag->size; jffs2_fragtree_insert(this, newfrag); - rb_insert_color(&this->rb, list); + rb_insert_color(&this->rb, root); return 0; } } @@ -275,15 +326,15 @@ static int jffs2_add_frag_to_fragtree(struct jffs2_sb_info *c, struct rb_root *l /* '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; @@ -296,8 +347,9 @@ static int jffs2_add_frag_to_fragtree(struct jffs2_sb_info *c, struct rb_root *l 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) { @@ -307,18 +359,14 @@ int jffs2_add_full_dnode_to_inode(struct jffs2_sb_info *c, struct jffs2_inode_in 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; @@ -344,10 +392,465 @@ int jffs2_add_full_dnode_to_inode(struct jffs2_sb_info *c, struct jffs2_inode_in } } 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) { diff --git a/fs/jffs2/nodelist.h b/fs/jffs2/nodelist.h index 53c12e4a337..adee3c6eb44 100644 --- a/fs/jffs2/nodelist.h +++ b/fs/jffs2/nodelist.h @@ -7,7 +7,7 @@ * * For licensing information, see the file 'LICENCE' in this directory. * - * $Id: nodelist.h,v 1.136 2005/07/31 08:20:44 dedekind Exp $ + * $Id: nodelist.h,v 1.137 2005/08/01 12:05:19 dedekind Exp $ * */ @@ -61,6 +61,9 @@ #error wibble #endif +/* The minimal node header size */ +#define JFFS2_MIN_NODE_HEADER sizeof(struct jffs2_raw_dirent) + /* This is all we need to keep in-core for each raw node during normal operation. As and when we do read_inode on a particular inode, we can @@ -148,6 +151,9 @@ struct jffs2_tmp_dnode_info struct rb_node rb; struct jffs2_full_dnode *fn; uint32_t version; + uint32_t data_crc; + uint32_t partial_crc; + uint32_t csize; }; struct jffs2_full_dirent @@ -311,6 +317,7 @@ void rb_replace_node(struct rb_node *victim, struct rb_node *new, struct rb_root void jffs2_obsolete_node_frag(struct jffs2_sb_info *c, struct jffs2_node_frag *this); int jffs2_add_full_dnode_to_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_full_dnode *fn); void jffs2_truncate_fragtree (struct jffs2_sb_info *c, struct rb_root *list, uint32_t size); +int jffs2_add_older_frag_to_fragtree(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_tmp_dnode_info *tn); /* nodemgmt.c */ int jffs2_thread_should_wake(struct jffs2_sb_info *c); diff --git a/fs/jffs2/readinode.c b/fs/jffs2/readinode.c index f3b12d7fe9a..488787a823b 100644 --- a/fs/jffs2/readinode.c +++ b/fs/jffs2/readinode.c @@ -7,7 +7,7 @@ * * 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 $ * */ @@ -21,8 +21,8 @@ #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) @@ -38,11 +38,11 @@ static void jffs2_add_tn_to_tree(struct jffs2_tmp_dnode_info *tn, struct rb_root /* 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); @@ -111,14 +111,9 @@ static struct jffs2_raw_node_ref *jffs2_first_valid_node(struct jffs2_raw_node_r * 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; @@ -196,30 +191,35 @@ read_direntry(struct jffs2_sb_info *c, * 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 */ @@ -227,107 +227,102 @@ read_dnode(struct jffs2_sb_info *c, 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); @@ -337,6 +332,10 @@ read_dnode(struct jffs2_sb_info *c, jffs2_add_tn_to_tree(tn, tnp); return 0; + +free_out: + jffs2_free_tmp_dnode_info(tn); + return ret; } /* @@ -347,11 +346,7 @@ read_dnode(struct jffs2_sb_info *c, * 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); @@ -394,9 +389,62 @@ read_unknown(struct jffs2_sb_info *c, 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, @@ -405,22 +453,47 @@ static int jffs2_get_inode_nodes(struct jffs2_sb_info *c, struct jffs2_inode_inf 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 @@ -433,70 +506,100 @@ static int jffs2_get_inode_nodes(struct jffs2_sb_info *c, struct jffs2_inode_inf 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; @@ -505,17 +608,21 @@ static int jffs2_get_inode_nodes(struct jffs2_sb_info *c, struct jffs2_inode_inf } 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; } @@ -523,14 +630,13 @@ static int jffs2_do_read_inode_internal(struct jffs2_sb_info *c, 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; @@ -550,42 +656,33 @@ static int jffs2_do_read_inode_internal(struct jffs2_sb_info *c, 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; @@ -595,7 +692,7 @@ static int jffs2_do_read_inode_internal(struct jffs2_sb_info *c, 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; @@ -606,10 +703,18 @@ static int jffs2_do_read_inode_internal(struct jffs2_sb_info *c, 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); |