diff options
Diffstat (limited to 'fs/jffs2/readinode.c')
| -rw-r--r-- | fs/jffs2/readinode.c | 863 |
1 files changed, 557 insertions, 306 deletions
diff --git a/fs/jffs2/readinode.c b/fs/jffs2/readinode.c index 339ba46320f..85a285b2a30 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 1.130 2005/07/24 15:29:56 dedekind Exp $ + * $Id: readinode.c,v 1.131 2005/07/27 14:46:11 dedekind Exp $ * */ @@ -20,376 +20,537 @@ #include <linux/compiler.h> #include "nodelist.h" -static int jffs2_add_frag_to_fragtree(struct jffs2_sb_info *c, struct rb_root *list, struct jffs2_node_frag *newfrag); - -static void jffs2_obsolete_node_frag(struct jffs2_sb_info *c, struct jffs2_node_frag *this) +void jffs2_truncate_fragtree (struct jffs2_sb_info *c, struct rb_root *list, uint32_t size) { - if (this->node) { - this->node->frags--; - if (!this->node->frags) { - /* The node has no valid frags left. It's totally obsoleted */ - D2(printk(KERN_DEBUG "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 { - D2(printk(KERN_DEBUG "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); + struct jffs2_node_frag *frag = jffs2_lookup_node_frag(list, size); + + D1(printk(KERN_DEBUG "Truncating fraglist 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) { + D1(printk(KERN_DEBUG "Truncating frag 0x%08x-0x%08x\n", frag->ofs, frag->ofs+frag->size)); + frag->size = size - frag->ofs; } - + frag = frag_next(frag); + } + while (frag && frag->ofs >= size) { + struct jffs2_node_frag *next = frag_next(frag); + + D1(printk(KERN_DEBUG "Removing frag 0x%08x-0x%08x\n", frag->ofs, frag->ofs+frag->size)); + frag_erase(frag, list); + jffs2_obsolete_node_frag(c, frag); + frag = next; } - jffs2_free_node_frag(this); } -/* Given an inode, probably with existing list of fragments, add the new node - * to the fragment list. +/* + * Put a new tmp_dnode_info into the temporaty RB-tree, keeping the list in + * order of increasing version. */ -int jffs2_add_full_dnode_to_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_full_dnode *fn) +static void jffs2_add_tn_to_tree(struct jffs2_tmp_dnode_info *tn, struct rb_root *list) { - int ret; - struct jffs2_node_frag *newfrag; + 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; + } + + rb_link_node(&tn->rb, parent, p); + rb_insert_color(&tn->rb, list); +} - D1(printk(KERN_DEBUG "jffs2_add_full_dnode_to_inode(ino #%u, f %p, fn %p)\n", f->inocache->ino, f, fn)); +static void jffs2_free_tmp_dnode_info_list(struct rb_root *list) +{ + struct rb_node *this; + struct jffs2_tmp_dnode_info *tn; + + this = list->rb_node; + + /* Now at bottom of tree */ + while (this) { + if (this->rb_left) + this = this->rb_left; + else if (this->rb_right) + this = this->rb_right; + 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(); + } + } + list->rb_node = NULL; +} - if (unlikely(!fn->size)) - return 0; +static void jffs2_free_full_dirent_list(struct jffs2_full_dirent *fd) +{ + struct jffs2_full_dirent *next; - newfrag = jffs2_alloc_node_frag(); - if (unlikely(!newfrag)) - return -ENOMEM; + while (fd) { + next = fd->next; + jffs2_free_full_dirent(fd); + fd = next; + } +} - D2(printk(KERN_DEBUG "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; +/* 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) +{ + 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; + } + return NULL; +} - ret = jffs2_add_frag_to_fragtree(c, &f->fragtree, newfrag); - if (ret) - return ret; +/* + * Helper function for jffs2_get_inode_nodes(). + * It is called every time an directory entry node is found. + * + * Returns: 0 on succes; + * 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) +{ + struct jffs2_full_dirent *fd; + + /* The direntry nodes are checked during the flash scanning */ + BUG_ON(ref_flags(ref) == REF_UNCHECKED); + /* Obsoleted. This cannot happen, surely? dwmw2 20020308 */ + BUG_ON(ref_obsolete(ref)); + + /* Sanity check */ + if (unlikely(PAD((rd->nsize + sizeof(*rd))) != PAD(je32_to_cpu(rd->totlen)))) { + printk(KERN_ERR "Error! Illegal nsize in node at %#08x: nsize %#02x, totlen %#04x\n", + ref_offset(ref), rd->nsize, je32_to_cpu(rd->totlen)); + return 1; + } + + fd = jffs2_alloc_full_dirent(rd->nsize + 1); + if (unlikely(!fd)) + return -ENOMEM; - /* 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); + fd->raw = ref; + fd->version = je32_to_cpu(rd->version); + fd->ino = je32_to_cpu(rd->ino); + fd->type = rd->type; - 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); + /* Pick out the mctime of the latest dirent */ + if(fd->version > *mctime_ver) { + *mctime_ver = fd->version; + *latest_mctime = je32_to_cpu(rd->mctime); } - if ((newfrag->ofs+newfrag->size) & (PAGE_CACHE_SIZE-1)) { - struct jffs2_node_frag *next = frag_next(newfrag); + /* + * Copy as much of the name as possible from the raw + * dirent we've already read from the flash. + */ + if (read > sizeof(*rd)) + memcpy(&fd->name[0], &rd->name[0], + min_t(uint32_t, rd->nsize, (read - sizeof(*rd)) )); - if (next) { - mark_ref_normal(fn->raw); - if (next->node) - mark_ref_normal(next->node->raw); + /* Do we need to copy any more of the name directly from the flash? */ + if (rd->nsize + sizeof(*rd) > read) { + /* FIXME: point() */ + int err; + int already = read - sizeof(*rd); + + err = jffs2_flash_read(c, (ref_offset(ref)) + read, + rd->nsize - already, &read, &fd->name[already]); + if (unlikely(read != rd->nsize - already) && likely(!err)) + return -EIO; + + if (unlikely(err)) { + printk(KERN_WARNING "Read remainder of name: error %d\n", err); + jffs2_free_full_dirent(fd); + return -EIO; } } - jffs2_dbg_fragtree_paranoia_check_nolock(f); - jffs2_dbg_dump_fragtree_nolock(f); + + fd->nhash = full_name_hash(fd->name, rd->nsize); + fd->next = NULL; + fd->name[rd->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, fdp); + 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) +/* + * Helper function for jffs2_get_inode_nodes(). + * It is called every time an inode node is found. + * + * Returns: 0 on succes; + * 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) { - 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); - - if (this) { - D2(printk(KERN_DEBUG "j_a_f_d_t_f: 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 { - D2(printk(KERN_DEBUG "j_a_f_d_t_f: Lookup gave no frag\n")); - lastend = 0; - } - - /* See if we ran off the end of the list */ - 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); + struct jffs2_eraseblock *jeb; + struct jffs2_tmp_dnode_info *tn; + + /* Obsoleted. This cannot happen, surely? dwmw2 20020308 */ + BUG_ON(ref_obsolete(ref)); + + /* If we've never checked the CRCs on this node, check them now */ + if (ref_flags(ref) == REF_UNCHECKED) { + uint32_t crc, len; + + crc = crc32(0, rd, sizeof(*rd) - 8); + if (unlikely(crc != je32_to_cpu(rd->node_crc))) { + printk(KERN_WARNING "Header CRC failed on node at %#08x: read %#08x, calculated %#08x\n", + ref_offset(ref), je32_to_cpu(rd->node_crc), crc); + return 1; + } + + /* Sanity checks */ + if (unlikely(je32_to_cpu(rd->offset) > je32_to_cpu(rd->isize)) || + unlikely(PAD(je32_to_cpu(rd->csize) + sizeof(*rd)) != PAD(je32_to_cpu(rd->totlen)))) { + printk(KERN_WARNING "Inode corrupted at %#08x, totlen %d, #ino %d, version %d, " + "isize %d, csize %d, dsize %d \n", + ref_offset(ref), je32_to_cpu(rd->totlen), je32_to_cpu(rd->ino), + je32_to_cpu(rd->version), je32_to_cpu(rd->isize), + je32_to_cpu(rd->csize), je32_to_cpu(rd->dsize)); + return 1; } - 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; + 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)) { + D1(printk(KERN_DEBUG "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)){ + D1(printk(KERN_DEBUG "MTD point failed %d\n", err)); + } else + pointed = 1; /* succefully pointed to device */ } - 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 */ - D2(printk(KERN_DEBUG "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 { - D2(printk(KERN_DEBUG "Adding hole frag (%p) at root of tree\n", holefrag)); - rb_link_node(&holefrag->rb, NULL, &list->rb_node); +#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; + } } - 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 the hole */ - D2(printk(KERN_DEBUG "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 { - D2(printk(KERN_DEBUG "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; - } - - D2(printk(KERN_DEBUG "j_a_f_d_t_f: 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)); - - /* 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 = jffs2_alloc_node_frag(); - if (!newfrag2) { - jffs2_free_node_frag(newfrag); - return -ENOMEM; + 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)) { + printk(KERN_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; } - D2(printk(KERN_DEBUG "split old frag 0x%04x-0x%04x -->", this->ofs, this->ofs+this->size); - if (this->node) - printk("phys 0x%08x\n", ref_offset(this->node->raw)); - else - printk("hole\n"); - ) - - /* 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; - 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, list); - jffs2_fragtree_insert(newfrag2, newfrag); - rb_insert_color(&newfrag2->rb, list); - - 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, list); - } else { - /* New frag starts at the same point as 'this' used to. Replace - it in the tree without doing a delete and insertion */ - D2(printk(KERN_DEBUG "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); - - if (newfrag->ofs + newfrag->size >= this->ofs+this->size) { - D2(printk(KERN_DEBUG "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; + /* 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. - jffs2_fragtree_insert(this, newfrag); - rb_insert_color(&this->rb, list); - return 0; + 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)))) { + D1(printk(KERN_DEBUG "Marking node at %#08x REF_PRISTINE\n", ref_offset(ref))); + ref->flash_offset = ref_offset(ref) | REF_PRISTINE; + } else { + D1(printk(KERN_DEBUG "Marking node at %#08x REF_NORMAL\n", ref_offset(ref))); + ref->flash_offset = ref_offset(ref) | REF_NORMAL; } + spin_unlock(&c->erase_completion_lock); } - /* 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. */ - D2(printk(KERN_DEBUG "Obsoleting node frag %p (%x-%x) and removing from tree\n", this, this->ofs, this->ofs+this->size)); - rb_erase(&this->rb, list); - 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; + tn = jffs2_alloc_tmp_dnode_info(); + if (!tn) { + D1(printk(KERN_DEBUG "alloc tn failed\n")); + return -ENOMEM; } - /* 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); + tn->fn = jffs2_alloc_full_dnode(); + if (!tn->fn) { + D1(printk(KERN_DEBUG "alloc fn failed\n")); + jffs2_free_tmp_dnode_info(tn); + return -ENOMEM; + } + + tn->version = je32_to_cpu(rd->version); + tn->fn->ofs = je32_to_cpu(rd->offset); + 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); + else // normal case... + tn->fn->size = je32_to_cpu(rd->dsize); + + D1(printk(KERN_DEBUG "dnode @%08x: ver %u, offset %#04x, dsize %#04x\n", + ref_offset(ref), je32_to_cpu(rd->version), + je32_to_cpu(rd->offset), je32_to_cpu(rd->dsize))); + + jffs2_add_tn_to_tree(tn, tnp); return 0; } -void jffs2_truncate_fragtree (struct jffs2_sb_info *c, struct rb_root *list, uint32_t size) +/* + * Helper function for jffs2_get_inode_nodes(). + * It is called every time an unknown node is found. + * + * Returns: 0 on succes; + * 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) { - struct jffs2_node_frag *frag = jffs2_lookup_node_frag(list, size); + /* We don't mark unknown nodes as REF_UNCHECKED */ + BUG_ON(ref_flags(ref) == REF_UNCHECKED); + + un->nodetype = cpu_to_je16(JFFS2_NODE_ACCURATE | je16_to_cpu(un->nodetype)); - D1(printk(KERN_DEBUG "Truncating fraglist to 0x%08x bytes\n", size)); + if (crc32(0, un, sizeof(struct jffs2_unknown_node) - 4) != je32_to_cpu(un->hdr_crc)) { - /* We know frag->ofs <= size. That's what lookup does for us */ - if (frag && frag->ofs != size) { - if (frag->ofs+frag->size >= size) { - D1(printk(KERN_DEBUG "Truncating frag 0x%08x-0x%08x\n", frag->ofs, frag->ofs+frag->size)); - frag->size = size - frag->ofs; + /* Hmmm. This should have been caught at scan time. */ + printk(KERN_WARNING "Warning! Node header CRC failed at %#08x. " + "But it must have been OK earlier.\n", ref_offset(ref)); + D1(printk(KERN_DEBUG "Node was: { %#04x, %#04x, %#08x, %#08x }\n", + je16_to_cpu(un->magic), je16_to_cpu(un->nodetype), + je32_to_cpu(un->totlen), je32_to_cpu(un->hdr_crc))); + return 1; + } else { + switch(je16_to_cpu(un->nodetype) & JFFS2_COMPAT_MASK) { + + case JFFS2_FEATURE_INCOMPAT: + printk(KERN_NOTICE "Unknown INCOMPAT nodetype %#04X at %#08x\n", + je16_to_cpu(un->nodetype), ref_offset(ref)); + /* EEP */ + BUG(); + break; + + case JFFS2_FEATURE_ROCOMPAT: + printk(KERN_NOTICE "Unknown ROCOMPAT nodetype %#04X at %#08x\n", + je16_to_cpu(un->nodetype), ref_offset(ref)); + BUG_ON(!(c->flags & JFFS2_SB_FLAG_RO)); + break; + + case JFFS2_FEATURE_RWCOMPAT_COPY: + printk(KERN_NOTICE "Unknown RWCOMPAT_COPY nodetype %#04X at %#08x\n", + je16_to_cpu(un->nodetype), ref_offset(ref)); + break; + + case JFFS2_FEATURE_RWCOMPAT_DELETE: + printk(KERN_NOTICE "Unknown RWCOMPAT_DELETE nodetype %#04X at %#08x\n", + je16_to_cpu(un->nodetype), ref_offset(ref)); + return 1; } - frag = frag_next(frag); } - while (frag && frag->ofs >= size) { - struct jffs2_node_frag *next = frag_next(frag); - D1(printk(KERN_DEBUG "Removing frag 0x%08x-0x%08x\n", frag->ofs, frag->ofs+frag->size)); - frag_erase(frag, list); - jffs2_obsolete_node_frag(c, frag); - frag = next; - } + return 0; } -/* Scan the list of all nodes present for this ino, build map of versions, etc. */ - -static int jffs2_do_read_inode_internal(struct jffs2_sb_info *c, - struct jffs2_inode_info *f, - struct jffs2_raw_inode *latest_node); +/* Get tmp_dnode_info and full_dirent for all non-obsolete nodes associated + with this ino, returning the former in order of version */ -int jffs2_do_read_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, - uint32_t ino, struct jffs2_raw_inode *latest_node) +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, + uint32_t *mctime_ver) { - D2(printk(KERN_DEBUG "jffs2_do_read_inode(): getting inocache\n")); + 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; + size_t retlen; + int err; - retry_inocache: - spin_lock(&c->inocache_lock); - f->inocache = jffs2_get_ino_cache(c, ino); + *mctime_ver = 0; + + D1(printk(KERN_DEBUG "jffs2_get_inode_nodes(): ino #%u\n", f->inocache->ino)); - D2(printk(KERN_DEBUG "jffs2_do_read_inode(): Got inocache at %p\n", f->inocache)); + spin_lock(&c->erase_completion_lock); - if (f->inocache) { - /* Check its state. We may need to wait before we can use it */ - switch(f->inocache->state) { - case INO_STATE_UNCHECKED: - case INO_STATE_CHECKEDABSENT: - f->inocache->state = INO_STATE_READING; - break; + valid_ref = jffs2_first_valid_node(f->inocache->nodes); + + if (!valid_ref && (f->inocache->ino != 1)) + printk(KERN_WARNING "Eep. No valid nodes for ino #%u\n", f->inocache->ino); + + 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); + + cond_resched(); + + /* FIXME: point() */ + err = jffs2_flash_read(c, (ref_offset(ref)), + min_t(uint32_t, ref_totlen(c, NULL, ref), sizeof(node)), + &retlen, (void *)&node); + if (err) { + printk(KERN_WARNING "error %d reading node at 0x%08x in get_inode_nodes()\n", err, ref_offset(ref)); + goto free_out; + } - case INO_STATE_CHECKING: - case INO_STATE_GC: - /* If it's in either of these states, we need - to wait for whoever's got it to finish and - put it back. */ - D1(printk(KERN_DEBUG "jffs2_get_ino_cache_read waiting for ino #%u in state %d\n", - ino, f->inocache->state)); - sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock); - goto retry_inocache; + 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 (retlen < sizeof(node.d)) { + printk(KERN_WARNING "Warning! 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 (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); - case INO_STATE_READING: - case INO_STATE_PRESENT: - /* Eep. This should never happen. It can - happen if Linux calls read_inode() again - before clear_inode() has finished though. */ - printk(KERN_WARNING "Eep. Trying to read_inode #%u when it's already in state %d!\n", ino, f->inocache->state); - /* Fail. That's probably better than allowing it to succeed */ - f->inocache = NULL; break; - default: - BUG(); - } - } - spin_unlock(&c->inocache_lock); + 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 "Warning! Short read dnode at %#08x\n", ref_offset(ref)); + err = -EIO; + goto free_out; + } - if (!f->inocache && ino == 1) { - /* Special case - no root inode on medium */ - f->inocache = jffs2_alloc_inode_cache(); - if (!f->inocache) { - printk(KERN_CRIT "jffs2_do_read_inode(): Cannot allocate inocache for root inode\n"); - return -ENOMEM; - } - D1(printk(KERN_DEBUG "jffs2_do_read_inode(): Creating inocache for root inode\n")); - memset(f->inocache, 0, sizeof(struct jffs2_inode_cache)); - f->inocache->ino = f->inocache->nlink = 1; - f->inocache->nodes = (struct jffs2_raw_node_ref *)f->inocache; - f->inocache->state = INO_STATE_READING; - jffs2_add_ino_cache(c, f->inocache); - } - if (!f->inocache) { - printk(KERN_WARNING "jffs2_do_read_inode() on nonexistent ino %u\n", ino); - return -ENOENT; - } + err = read_dnode(c, ref, &node.i, retlen, &ret_tn, latest_mctime, mctime_ver); + if (err == 1) { + jffs2_mark_node_obsolete(c, ref); + break; + } else if (unlikely(err)) + goto free_out; - return jffs2_do_read_inode_internal(c, f, latest_node); -} + 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)); -int jffs2_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) -{ - struct jffs2_raw_inode n; - struct jffs2_inode_info *f = kmalloc(sizeof(*f), GFP_KERNEL); - int ret; + break; - if (!f) - return -ENOMEM; + default: + /* Check we've managed to read at least the common node header */ + if (retlen < sizeof(struct jffs2_unknown_node)) { + printk(KERN_WARNING "Warning! Short read unknown node at %#08x\n", + ref_offset(ref)); + return -EIO; + } - memset(f, 0, sizeof(*f)); - init_MUTEX_LOCKED(&f->sem); - f->inocache = ic; + err = read_unknown(c, ref, &node.u, retlen); + if (err == 1) { + jffs2_mark_node_obsolete(c, ref); + break; + } else if (unlikely(err)) + goto free_out; + + } + spin_lock(&c->erase_completion_lock); - ret = jffs2_do_read_inode_internal(c, f, &n); - if (!ret) { - up(&f->sem); - jffs2_do_clear_inode(c, f); } - kfree (f); - return ret; + spin_unlock(&c->erase_completion_lock); + *tnp = ret_tn; + *fdp = ret_fd; + + return 0; + + free_out: + jffs2_free_tmp_dnode_info_list(&ret_tn); + jffs2_free_full_dirent_list(ret_fd); + return err; } static int jffs2_do_read_inode_internal(struct jffs2_sb_info *c, @@ -618,6 +779,96 @@ static int jffs2_do_read_inode_internal(struct jffs2_sb_info *c, return 0; } +/* Scan the list of all nodes present for this ino, build map of versions, etc. */ +int jffs2_do_read_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, + uint32_t ino, struct jffs2_raw_inode *latest_node) +{ + D2(printk(KERN_DEBUG "jffs2_do_read_inode(): getting inocache\n")); + + retry_inocache: + spin_lock(&c->inocache_lock); + f->inocache = jffs2_get_ino_cache(c, ino); + + D2(printk(KERN_DEBUG "jffs2_do_read_inode(): Got inocache at %p\n", f->inocache)); + + if (f->inocache) { + /* Check its state. We may need to wait before we can use it */ + switch(f->inocache->state) { + case INO_STATE_UNCHECKED: + case INO_STATE_CHECKEDABSENT: + f->inocache->state = INO_STATE_READING; + break; + + case INO_STATE_CHECKING: + case INO_STATE_GC: + /* If it's in either of these states, we need + to wait for whoever's got it to finish and + put it back. */ + D1(printk(KERN_DEBUG "jffs2_get_ino_cache_read waiting for ino #%u in state %d\n", + ino, f->inocache->state)); + sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock); + goto retry_inocache; + + case INO_STATE_READING: + case INO_STATE_PRESENT: + /* Eep. This should never happen. It can + happen if Linux calls read_inode() again + before clear_inode() has finished though. */ + printk(KERN_WARNING "Eep. Trying to read_inode #%u when it's already in state %d!\n", ino, f->inocache->state); + /* Fail. That's probably better than allowing it to succeed */ + f->inocache = NULL; + break; + + default: + BUG(); + } + } + spin_unlock(&c->inocache_lock); + + if (!f->inocache && ino == 1) { + /* Special case - no root inode on medium */ + f->inocache = jffs2_alloc_inode_cache(); + if (!f->inocache) { + printk(KERN_CRIT "jffs2_do_read_inode(): Cannot allocate inocache for root inode\n"); + return -ENOMEM; + } + D1(printk(KERN_DEBUG "jffs2_do_read_inode(): Creating inocache for root inode\n")); + memset(f->inocache, 0, sizeof(struct jffs2_inode_cache)); + f->inocache->ino = f->inocache->nlink = 1; + f->inocache->nodes = (struct jffs2_raw_node_ref *)f->inocache; + f->inocache->state = INO_STATE_READING; + jffs2_add_ino_cache(c, f->inocache); + } + if (!f->inocache) { + printk(KERN_WARNING "jffs2_do_read_inode() on nonexistent ino %u\n", ino); + return -ENOENT; + } + + return jffs2_do_read_inode_internal(c, f, latest_node); +} + +int jffs2_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) +{ + struct jffs2_raw_inode n; + struct jffs2_inode_info *f = kmalloc(sizeof(*f), GFP_KERNEL); + int ret; + + if (!f) + return -ENOMEM; + + memset(f, 0, sizeof(*f)); + init_MUTEX_LOCKED(&f->sem); + f->inocache = ic; + + ret = jffs2_do_read_inode_internal(c, f, &n); + if (!ret) { + up(&f->sem); + jffs2_do_clear_inode(c, f); + } + kfree (f); + return ret; +} + void jffs2_do_clear_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f) { struct jffs2_full_dirent *fd, *fds; |