diff options
Diffstat (limited to 'fs/jffs2/nodelist.c')
| -rw-r--r-- | fs/jffs2/nodelist.c | 1226 |
1 files changed, 773 insertions, 453 deletions
diff --git a/fs/jffs2/nodelist.c b/fs/jffs2/nodelist.c index 4991c348f6e..c79eebb8ab3 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 1.98 2005/07/10 15:15:32 dedekind Exp $ + * $Id: nodelist.c,v 1.115 2005/11/07 11:14:40 gleixner Exp $ * */ @@ -24,469 +24,832 @@ void jffs2_add_fd_to_list(struct jffs2_sb_info *c, struct jffs2_full_dirent *new, struct jffs2_full_dirent **list) { struct jffs2_full_dirent **prev = list; - D1(printk(KERN_DEBUG "jffs2_add_fd_to_list( %p, %p (->%p))\n", new, list, *list)); + + dbg_dentlist("add dirent \"%s\", ino #%u\n", new->name, new->ino); while ((*prev) && (*prev)->nhash <= new->nhash) { if ((*prev)->nhash == new->nhash && !strcmp((*prev)->name, new->name)) { /* Duplicate. Free one */ if (new->version < (*prev)->version) { - D1(printk(KERN_DEBUG "Eep! Marking new dirent node obsolete\n")); - D1(printk(KERN_DEBUG "New dirent is \"%s\"->ino #%u. Old is \"%s\"->ino #%u\n", new->name, new->ino, (*prev)->name, (*prev)->ino)); + dbg_dentlist("Eep! Marking new dirent node is obsolete, old is \"%s\", ino #%u\n", + (*prev)->name, (*prev)->ino); jffs2_mark_node_obsolete(c, new->raw); jffs2_free_full_dirent(new); } else { - D1(printk(KERN_DEBUG "Marking old dirent node (ino #%u) obsolete\n", (*prev)->ino)); + dbg_dentlist("marking old dirent \"%s\", ino #%u bsolete\n", + (*prev)->name, (*prev)->ino); new->next = (*prev)->next; jffs2_mark_node_obsolete(c, ((*prev)->raw)); jffs2_free_full_dirent(*prev); *prev = new; } - goto out; + return; } prev = &((*prev)->next); } new->next = *prev; *prev = new; +} + +void jffs2_truncate_fragtree(struct jffs2_sb_info *c, struct rb_root *list, uint32_t size) +{ + struct jffs2_node_frag *frag = jffs2_lookup_node_frag(list, size); + + dbg_fragtree("truncating fragtree to 0x%08x bytes\n", size); + + /* We know frag->ofs <= size. That's what lookup does for us */ + if (frag && frag->ofs != size) { + if (frag->ofs+frag->size > size) { + frag->size = size - frag->ofs; + } + frag = frag_next(frag); + } + while (frag && frag->ofs >= size) { + struct jffs2_node_frag *next = frag_next(frag); + + frag_erase(frag, list); + jffs2_obsolete_node_frag(c, frag); + frag = next; + } - out: - D2(while(*list) { - printk(KERN_DEBUG "Dirent \"%s\" (hash 0x%08x, ino #%u\n", (*list)->name, (*list)->nhash, (*list)->ino); - list = &(*list)->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->node && (frag->ofs & (PAGE_CACHE_SIZE - 1)) == 0) { + 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; + } } -/* - * 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) +void jffs2_obsolete_node_frag(struct jffs2_sb_info *c, struct jffs2_node_frag *this) { - struct rb_node **p = &list->rb_node; - struct rb_node * parent = NULL; - struct jffs2_tmp_dnode_info *this; - - while (*p) { - parent = *p; - this = rb_entry(parent, struct jffs2_tmp_dnode_info, rb); - - /* 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) - p = &(*p)->rb_left; - else - p = &(*p)->rb_right; - } + if (this->node) { + this->node->frags--; + if (!this->node->frags) { + /* The node has no valid frags left. It's totally obsoleted */ + dbg_fragtree2("marking old node @0x%08x (0x%04x-0x%04x) obsolete\n", + ref_offset(this->node->raw), this->node->ofs, this->node->ofs+this->node->size); + jffs2_mark_node_obsolete(c, this->node->raw); + jffs2_free_full_dnode(this->node); + } else { + dbg_fragtree2("marking old node @0x%08x (0x%04x-0x%04x) REF_NORMAL. frags is %d\n", + ref_offset(this->node->raw), this->node->ofs, this->node->ofs+this->node->size, this->node->frags); + mark_ref_normal(this->node->raw); + } - rb_link_node(&tn->rb, parent, p); - rb_insert_color(&tn->rb, list); + } + jffs2_free_node_frag(this); } -static void jffs2_free_tmp_dnode_info_list(struct rb_root *list) +static void jffs2_fragtree_insert(struct jffs2_node_frag *newfrag, struct jffs2_node_frag *base) { - struct rb_node *this; - struct jffs2_tmp_dnode_info *tn; + struct rb_node *parent = &base->rb; + struct rb_node **link = &parent; - this = list->rb_node; + dbg_fragtree2("insert frag (0x%04x-0x%04x)\n", newfrag->ofs, newfrag->ofs + newfrag->size); - /* Now at bottom of tree */ - while (this) { - if (this->rb_left) - this = this->rb_left; - else if (this->rb_right) - this = this->rb_right; + while (*link) { + parent = *link; + base = rb_entry(parent, struct jffs2_node_frag, rb); + + if (newfrag->ofs > base->ofs) + link = &base->rb.rb_right; + else if (newfrag->ofs < base->ofs) + link = &base->rb.rb_left; else { - tn = rb_entry(this, struct jffs2_tmp_dnode_info, rb); - jffs2_free_full_dnode(tn->fn); - jffs2_free_tmp_dnode_info(tn); - - this = this->rb_parent; - if (!this) - break; - - if (this->rb_left == &tn->rb) - this->rb_left = NULL; - else if (this->rb_right == &tn->rb) - this->rb_right = NULL; - else BUG(); + JFFS2_ERROR("duplicate frag at %08x (%p,%p)\n", newfrag->ofs, newfrag, base); + BUG(); } } - list->rb_node = NULL; + + rb_link_node(&newfrag->rb, &base->rb, link); } -static void jffs2_free_full_dirent_list(struct jffs2_full_dirent *fd) +/* + * 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_full_dirent *next; - - while (fd) { - next = fd->next; - jffs2_free_full_dirent(fd); - fd = next; + 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; } -/* Returns first valid node after 'ref'. May return 'ref' */ -static struct jffs2_raw_node_ref *jffs2_first_valid_node(struct jffs2_raw_node_ref *ref) +/* + * 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) { - while (ref && ref->next_in_ino) { - if (!ref_obsolete(ref)) - return ref; - D1(printk(KERN_DEBUG "node at 0x%08x is obsoleted. Ignoring.\n", ref_offset(ref))); - ref = ref->next_in_ino; + 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 */ + dbg_fragtree2("add hole frag %#04x-%#04x 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 { + dbg_fragtree2("Add hole frag %#04x-%#04x 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 */ + dbg_fragtree2("add the new node at the right\n"); + rb_link_node(&newfrag->rb, &this->rb, &this->rb.rb_right); + } else { + dbg_fragtree2("insert the new node at the root of the tree\n"); + rb_link_node(&newfrag->rb, NULL, &root->rb_node); } - return NULL; + rb_insert_color(&newfrag->rb, root); + + 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 */ +/* Doesn't set inode->i_size */ +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(root, newfrag->node->ofs); + + if (this) { + dbg_fragtree2("lookup gave 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); + lastend = this->ofs + this->size; + } else { + dbg_fragtree2("lookup gave no frag\n"); + lastend = 0; + } + + /* See if we ran off the end of the fragtree */ + if (lastend <= newfrag->ofs) { + /* We did */ + + /* Check if 'this' node was on the same page as the new node. + If so, both 'this' and the new node get marked REF_NORMAL so + the GC can take a look. + */ + if (lastend && (lastend-1) >> PAGE_CACHE_SHIFT == newfrag->ofs >> PAGE_CACHE_SHIFT) { + if (this->node) + mark_ref_normal(this->node->raw); + mark_ref_normal(newfrag->node->raw); + } + + return no_overlapping_node(c, root, newfrag, this, lastend); + } -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, - uint32_t *mctime_ver) + if (this->node) + 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 + 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 (newfrag->ofs > this->ofs) { + /* This node isn't completely obsoleted. The start of it remains valid */ + + /* Mark the new node and the partially covered node REF_NORMAL -- let + the GC take a look at them */ + mark_ref_normal(newfrag->node->raw); + if (this->node) + mark_ref_normal(this->node->raw); + + if (this->ofs + this->size > newfrag->ofs + newfrag->size) { + /* The new node splits 'this' frag into two */ + struct jffs2_node_frag *newfrag2; + + if (this->node) + dbg_fragtree2("split old frag 0x%04x-0x%04x, phys 0x%08x\n", + this->ofs, this->ofs+this->size, ref_offset(this->node->raw)); + else + dbg_fragtree2("split old hole frag 0x%04x-0x%04x\n", + this->ofs, this->ofs+this->size); + + /* New second frag pointing to this's 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++; + + /* Adjust size of original 'this' */ + this->size = newfrag->ofs - this->ofs; + + /* Now, we know there's no node with offset + greater than this->ofs but smaller than + newfrag2->ofs or newfrag->ofs, for obvious + reasons. So we can do a tree insert from + 'this' to insert newfrag, and a tree insert + from newfrag to insert newfrag2. */ + jffs2_fragtree_insert(newfrag, this); + rb_insert_color(&newfrag->rb, root); + + jffs2_fragtree_insert(newfrag2, newfrag); + rb_insert_color(&newfrag2->rb, root); + + return 0; + } + /* New node just reduces 'this' frag in size, doesn't split it */ + this->size = newfrag->ofs - this->ofs; + + /* Again, we know it lives down here in the tree */ + jffs2_fragtree_insert(newfrag, this); + 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 */ + 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, root); + + if (newfrag->ofs + newfrag->size >= this->ofs+this->size) { + dbg_fragtree2("obsoleting node frag %p (%x-%x)\n", this, this->ofs, this->ofs+this->size); + jffs2_obsolete_node_frag(c, this); + } else { + this->ofs += newfrag->size; + this->size -= newfrag->size; + + jffs2_fragtree_insert(this, newfrag); + rb_insert_color(&this->rb, root); + return 0; + } + } + /* OK, now we have newfrag added in the correct place in the tree, but + frag_next(newfrag) may be a fragment which is overlapped by it + */ + while ((this = frag_next(newfrag)) && newfrag->ofs + newfrag->size >= this->ofs + this->size) { + /* 'this' frag is obsoleted completely. */ + dbg_fragtree2("obsoleting node frag %p (%x-%x) and removing from tree\n", + this, this->ofs, this->ofs+this->size); + 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) + 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; + + /* And mark them REF_NORMAL so the GC takes a look at them */ + if (this->node) + mark_ref_normal(this->node->raw); + mark_ref_normal(newfrag->node->raw); + + return 0; +} + +/* + * 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) { - struct jffs2_raw_node_ref *ref, *valid_ref; - struct jffs2_tmp_dnode_info *tn; - struct rb_root ret_tn = RB_ROOT; - struct jffs2_full_dirent *fd, *ret_fd = NULL; - union jffs2_node_union node; - size_t retlen; - int err; - - *mctime_ver = 0; - - D1(printk(KERN_DEBUG "jffs2_get_inode_nodes(): ino #%u\n", f->inocache->ino)); + int ret; + struct jffs2_node_frag *newfrag; - spin_lock(&c->erase_completion_lock); + if (unlikely(!fn->size)) + return 0; - valid_ref = jffs2_first_valid_node(f->inocache->nodes); + newfrag = new_fragment(fn, fn->ofs, fn->size); + if (unlikely(!newfrag)) + return -ENOMEM; + newfrag->node->frags = 1; - if (!valid_ref && (f->inocache->ino != 1)) - printk(KERN_WARNING "Eep. No valid nodes for ino #%u\n", f->inocache->ino); + dbg_fragtree("adding node %#04x-%#04x @0x%08x on flash, newfrag *%p\n", + fn->ofs, fn->ofs+fn->size, ref_offset(fn->raw), newfrag); - while (valid_ref) { - /* 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 - not holding the lock, it can go away immediately. For that reason, - we find the next valid node first, before processing 'ref'. - */ - ref = valid_ref; - valid_ref = jffs2_first_valid_node(ref->next_in_ino); - spin_unlock(&c->erase_completion_lock); + ret = jffs2_add_frag_to_fragtree(c, &f->fragtree, newfrag); + if (unlikely(ret)) + return ret; - cond_resched(); + /* If we now share a page with other nodes, mark either previous + or next node REF_NORMAL, as appropriate. */ + if (newfrag->ofs & (PAGE_CACHE_SIZE-1)) { + struct jffs2_node_frag *prev = frag_prev(newfrag); + + mark_ref_normal(fn->raw); + /* If we don't start at zero there's _always_ a previous */ + if (prev->node) + mark_ref_normal(prev->node->raw); + } + + if ((newfrag->ofs+newfrag->size) & (PAGE_CACHE_SIZE-1)) { + struct jffs2_node_frag *next = frag_next(newfrag); + + if (next) { + mark_ref_normal(fn->raw); + if (next->node) + mark_ref_normal(next->node->raw); + } + } + jffs2_dbg_fragtree_paranoia_check_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); + + if (!jffs2_is_writebuffered(c)) + goto adj_acc; + + /* Calculate how many bytes were already checked */ + ofs = ref_offset(ref) + sizeof(struct jffs2_raw_inode); + len = ofs % c->wbuf_pagesize; + if (likely(len)) + len = c->wbuf_pagesize - len; + + if (len >= tn->csize) { + 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; + + 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; - /* FIXME: point() */ - err = jffs2_flash_read(c, (ref_offset(ref)), - min_t(uint32_t, ref_totlen(c, NULL, ref), sizeof(node)), - &retlen, (void *)&node); + /* TODO: this is very frequent pattern, make it a separate + * routine */ + err = jffs2_flash_read(c, ofs, len, &retlen, buffer); if (err) { - printk(KERN_WARNING "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, ofs, err); goto free_out; } - - /* Check we've managed to read at least the common node header */ - if (retlen < min_t(uint32_t, ref_totlen(c, NULL, ref), sizeof(node.u))) { - printk(KERN_WARNING "short read in get_inode_nodes()\n"); + if (retlen != len) { + JFFS2_ERROR("short read at %#08x: %d instead of %d.\n", ofs, retlen, len); err = -EIO; goto free_out; } - - switch (je16_to_cpu(node.u.nodetype)) { - case JFFS2_NODETYPE_DIRENT: - D1(printk(KERN_DEBUG "Node at %08x (%d) is a dirent node\n", ref_offset(ref), ref_flags(ref))); - if (ref_flags(ref) == REF_UNCHECKED) { - printk(KERN_WARNING "BUG: Dirent node at 0x%08x never got checked? How?\n", ref_offset(ref)); - BUG(); - } - if (retlen < sizeof(node.d)) { - printk(KERN_WARNING "short read in get_inode_nodes()\n"); - err = -EIO; - goto free_out; - } - /* sanity check */ - if (PAD((node.d.nsize + sizeof (node.d))) != PAD(je32_to_cpu (node.d.totlen))) { - printk(KERN_NOTICE "jffs2_get_inode_nodes(): Illegal nsize in node at 0x%08x: nsize 0x%02x, totlen %04x\n", - ref_offset(ref), node.d.nsize, je32_to_cpu(node.d.totlen)); - jffs2_mark_node_obsolete(c, ref); - spin_lock(&c->erase_completion_lock); - continue; - } - if (je32_to_cpu(node.d.version) > *highest_version) - *highest_version = je32_to_cpu(node.d.version); - if (ref_obsolete(ref)) { - /* Obsoleted. This cannot happen, surely? dwmw2 20020308 */ - printk(KERN_ERR "Dirent node at 0x%08x became obsolete while we weren't looking\n", - ref_offset(ref)); - BUG(); - } - - fd = jffs2_alloc_full_dirent(node.d.nsize+1); - if (!fd) { - err = -ENOMEM; - goto free_out; - } - fd->raw = ref; - fd->version = je32_to_cpu(node.d.version); - fd->ino = je32_to_cpu(node.d.ino); - fd->type = node.d.type; - - /* Pick out the mctime of the latest dirent */ - if(fd->version > *mctime_ver) { - *mctime_ver = fd->version; - *latest_mctime = je32_to_cpu(node.d.mctime); - } + } - /* memcpy as much of the name as possible from the raw - dirent we've already read from the flash - */ - if (retlen > sizeof(struct jffs2_raw_dirent)) - memcpy(&fd->name[0], &node.d.name[0], min_t(uint32_t, node.d.nsize, (retlen-sizeof(struct jffs2_raw_dirent)))); - - /* Do we need to copy any more of the name directly - from the flash? - */ - if (node.d.nsize + sizeof(struct jffs2_raw_dirent) > retlen) { - /* FIXME: point() */ - int already = retlen - sizeof(struct jffs2_raw_dirent); - - err = jffs2_flash_read(c, (ref_offset(ref)) + retlen, - node.d.nsize - already, &retlen, &fd->name[already]); - if (!err && retlen != node.d.nsize - already) - err = -EIO; - - if (err) { - printk(KERN_WARNING "Read remainder of name in jffs2_get_inode_nodes(): error %d\n", err); - jffs2_free_full_dirent(fd); - goto free_out; - } - } - fd->nhash = full_name_hash(fd->name, node.d.nsize); - fd->next = NULL; - fd->name[node.d.nsize] = '\0'; - /* Wheee. We now have a complete jffs2_full_dirent structure, with - the name in it and everything. Link it into the list - */ - D1(printk(KERN_DEBUG "Adding fd \"%s\", ino #%u\n", fd->name, fd->ino)); - jffs2_add_fd_to_list(c, fd, &ret_fd); - break; - - case JFFS2_NODETYPE_INODE: - D1(printk(KERN_DEBUG "Node at %08x (%d) is a data node\n", ref_offset(ref), ref_flags(ref))); - if (retlen < sizeof(node.i)) { - printk(KERN_WARNING "read too short for dnode\n"); - err = -EIO; - goto free_out; - } - if (je32_to_cpu(node.i.version) > *highest_version) - *highest_version = je32_to_cpu(node.i.version); - D1(printk(KERN_DEBUG "version %d, highest_version now %d\n", je32_to_cpu(node.i.version), *highest_version)); - - if (ref_obsolete(ref)) { - /* Obsoleted. This cannot happen, surely? dwmw2 20020308 */ - printk(KERN_ERR "Inode node at 0x%08x became obsolete while we weren't looking\n", - ref_offset(ref)); - BUG(); - } + /* 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 we've never checked the CRCs on this node, check them now. */ - if (ref_flags(ref) == REF_UNCHECKED) { - uint32_t crc, len; - struct jffs2_eraseblock *jeb; - - crc = crc32(0, &node, sizeof(node.i)-8); - if (crc != je32_to_cpu(node.i.node_crc)) { - printk(KERN_NOTICE "jffs2_get_inode_nodes(): CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", - ref_offset(ref), je32_to_cpu(node.i.node_crc), crc); - jffs2_mark_node_obsolete(c, ref); - spin_lock(&c->erase_completion_lock); - continue; - } - - /* sanity checks */ - if ( je32_to_cpu(node.i.offset) > je32_to_cpu(node.i.isize) || - PAD(je32_to_cpu(node.i.csize) + sizeof (node.i)) != PAD(je32_to_cpu(node.i.totlen))) { - printk(KERN_NOTICE "jffs2_get_inode_nodes(): Inode corrupted at 0x%08x, totlen %d, #ino %d, version %d, isize %d, csize %d, dsize %d \n", - ref_offset(ref), je32_to_cpu(node.i.totlen), je32_to_cpu(node.i.ino), - je32_to_cpu(node.i.version), je32_to_cpu(node.i.isize), - je32_to_cpu(node.i.csize), je32_to_cpu(node.i.dsize)); - jffs2_mark_node_obsolete(c, ref); - spin_lock(&c->erase_completion_lock); - continue; - } + if (crc != tn->data_crc) { + JFFS2_NOTICE("wrong data CRC in data node at 0x%08x: read %#08x, calculated %#08x.\n", + ofs, tn->data_crc, crc); + return 1; + } - if (node.i.compr != JFFS2_COMPR_ZERO && je32_to_cpu(node.i.csize)) { - unsigned char *buf=NULL; - uint32_t pointed = 0; -#ifndef __ECOS - if (c->mtd->point) { - err = c->mtd->point (c->mtd, ref_offset(ref) + sizeof(node.i), je32_to_cpu(node.i.csize), - &retlen, &buf); - if (!err && retlen < je32_to_cpu(node.i.csize)) { - D1(printk(KERN_DEBUG "MTD point returned len too short: 0x%zx\n", retlen)); - c->mtd->unpoint(c->mtd, buf, ref_offset(ref) + sizeof(node.i), je32_to_cpu(node.i.csize)); - } else if (err){ - D1(printk(KERN_DEBUG "MTD point failed %d\n", err)); - } else - pointed = 1; /* succefully pointed to device */ - } -#endif - if(!pointed){ - buf = kmalloc(je32_to_cpu(node.i.csize), GFP_KERNEL); - if (!buf) - return -ENOMEM; - - err = jffs2_flash_read(c, ref_offset(ref) + sizeof(node.i), je32_to_cpu(node.i.csize), - &retlen, buf); - if (!err && retlen != je32_to_cpu(node.i.csize)) - err = -EIO; - if (err) { - kfree(buf); - return err; - } - } - crc = crc32(0, buf, je32_to_cpu(node.i.csize)); - if(!pointed) - kfree(buf); +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, buf, ref_offset(ref) + sizeof(node.i), je32_to_cpu(node.i.csize)); + else + c->mtd->unpoint(c->mtd, buffer, ofs, len); #endif + return err; +} - if (crc != je32_to_cpu(node.i.data_crc)) { - printk(KERN_NOTICE "jffs2_get_inode_nodes(): Data CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", - ref_offset(ref), je32_to_cpu(node.i.data_crc), crc); - jffs2_mark_node_obsolete(c, ref); - spin_lock(&c->erase_completion_lock); - continue; - } - - } +/* + * 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; - /* Mark the node as having been checked and fix the accounting accordingly */ - spin_lock(&c->erase_completion_lock); - jeb = &c->blocks[ref->flash_offset / c->sector_size]; - len = ref_totlen(c, jeb, ref); - - 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 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(node.i.dsize) >= PAGE_CACHE_SIZE) || - ( ((je32_to_cpu(node.i.offset)&(PAGE_CACHE_SIZE-1))==0) && - (je32_to_cpu(node.i.dsize)+je32_to_cpu(node.i.offset) == je32_to_cpu(node.i.isize)))) { - D1(printk(KERN_DEBUG "Marking node at 0x%08x REF_PRISTINE\n", ref_offset(ref))); - ref->flash_offset = ref_offset(ref) | REF_PRISTINE; - } else { - D1(printk(KERN_DEBUG "Marking node at 0x%08x REF_NORMAL\n", ref_offset(ref))); - ref->flash_offset = ref_offset(ref) | REF_NORMAL; - } - spin_unlock(&c->erase_completion_lock); + 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; + + dbg_fragtree2("check node %#04x-%#04x, 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)) { + 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) +{ + 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. + */ + + 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. + */ + 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; + 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) { + 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; + + dbg_fragtree("insert fragment %#04x-%#04x, ver %u\n", fn_ofs, fn_ofs + fn_size, tn->version); + + /* Skip all the nodes which are completed before this one starts */ + this = jffs2_lookup_node_frag(root, fn_ofs); + if (this) + 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; + } - tn = jffs2_alloc_tmp_dnode_info(); - if (!tn) { - D1(printk(KERN_DEBUG "alloc tn failed\n")); - err = -ENOMEM; - goto free_out; + 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; } - tn->fn = jffs2_alloc_full_dnode(); - if (!tn->fn) { - D1(printk(KERN_DEBUG "alloc fn failed\n")); - err = -ENOMEM; - jffs2_free_tmp_dnode_info(tn); - goto free_out; + 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; } - tn->version = je32_to_cpu(node.i.version); - tn->fn->ofs = je32_to_cpu(node.i.offset); - /* There was a bug where we wrote hole nodes out with - csize/dsize swapped. Deal with it */ - if (node.i.compr == JFFS2_COMPR_ZERO && !je32_to_cpu(node.i.dsize) && je32_to_cpu(node.i.csize)) - tn->fn->size = je32_to_cpu(node.i.csize); - e |