| /* |
| * JFFS2 -- Journalling Flash File System, Version 2. |
| * |
| * Copyright © 2001-2007 Red Hat, Inc. |
| * |
| * Created by David Woodhouse <dwmw2@infradead.org> |
| * |
| * For licensing information, see the file 'LICENCE' in this directory. |
| * |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/slab.h> |
| #include <linux/fs.h> |
| #include <linux/crc32.h> |
| #include <linux/pagemap.h> |
| #include <linux/mtd/mtd.h> |
| #include <linux/compiler.h> |
| #include "nodelist.h" |
| |
| /* |
| * Check the data CRC of the node. |
| * |
| * Returns: 0 if the data CRC is correct; |
| * 1 - if incorrect; |
| * error code if an error occurred. |
| */ |
| 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, len; |
| size_t retlen; |
| |
| BUG_ON(tn->csize == 0); |
| |
| /* Calculate how many bytes were already checked */ |
| ofs = ref_offset(ref) + sizeof(struct jffs2_raw_inode); |
| len = tn->csize; |
| |
| if (jffs2_is_writebuffered(c)) { |
| int adj = ofs % c->wbuf_pagesize; |
| if (likely(adj)) |
| adj = c->wbuf_pagesize - adj; |
| |
| if (adj >= 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 += adj; |
| len -= adj; |
| } |
| |
| 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 = mtd_point(c->mtd, ofs, len, &retlen, (void **)&buffer, |
| NULL); |
| if (!err && retlen < len) { |
| JFFS2_WARNING("MTD point returned len too short: %zu instead of %u.\n", retlen, tn->csize); |
| c->mtd->unpoint(c->mtd, ofs, retlen); |
| } 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: %zd 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, ofs, len); |
| #endif |
| |
| if (crc != tn->data_crc) { |
| JFFS2_NOTICE("wrong data CRC in data node at 0x%08x: read %#08x, calculated %#08x.\n", |
| ref_offset(ref), tn->data_crc, crc); |
| return 1; |
| } |
| |
| adj_acc: |
| jeb = &c->blocks[ref->flash_offset / c->sector_size]; |
| len = ref_totlen(c, jeb, ref); |
| /* If it should be REF_NORMAL, it'll get marked as such when |
| we build the fragtree, shortly. No need to worry about GC |
| moving it while it's marked REF_PRISTINE -- GC won't happen |
| till we've finished checking every inode anyway. */ |
| ref->flash_offset |= REF_PRISTINE; |
| /* |
| * 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; |
| jffs2_dbg_acct_paranoia_check_nolock(c, jeb); |
| spin_unlock(&c->erase_completion_lock); |
| |
| return 0; |
| |
| free_out: |
| if(!pointed) |
| kfree(buffer); |
| #ifndef __ECOS |
| else |
| c->mtd->unpoint(c->mtd, 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 int check_tn_node(struct jffs2_sb_info *c, 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; |
| |
| dbg_readinode("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_readinode("CRC error, mark it obsolete.\n"); |
| jffs2_mark_node_obsolete(c, tn->fn->raw); |
| } |
| |
| return ret; |
| } |
| |
| static struct jffs2_tmp_dnode_info *jffs2_lookup_tn(struct rb_root *tn_root, uint32_t offset) |
| { |
| struct rb_node *next; |
| struct jffs2_tmp_dnode_info *tn = NULL; |
| |
| dbg_readinode("root %p, offset %d\n", tn_root, offset); |
| |
| next = tn_root->rb_node; |
| |
| while (next) { |
| tn = rb_entry(next, struct jffs2_tmp_dnode_info, rb); |
| |
| if (tn->fn->ofs < offset) |
| next = tn->rb.rb_right; |
| else if (tn->fn->ofs >= offset) |
| next = tn->rb.rb_left; |
| else |
| break; |
| } |
| |
| return tn; |
| } |
| |
| |
| static void jffs2_kill_tn(struct jffs2_sb_info *c, struct jffs2_tmp_dnode_info *tn) |
| { |
| jffs2_mark_node_obsolete(c, tn->fn->raw); |
| jffs2_free_full_dnode(tn->fn); |
| jffs2_free_tmp_dnode_info(tn); |
| } |
| /* |
| * This function is used when we read an inode. Data nodes arrive in |
| * arbitrary order -- they may be older or newer than the nodes which |
| * are already in the tree. Where overlaps occur, the older node can |
| * be discarded as long as the newer passes the CRC check. We don't |
| * bother to keep track of holes in this rbtree, and neither do we deal |
| * with frags -- we can have multiple entries starting at the same |
| * offset, and the one with the smallest length will come first in the |
| * ordering. |
| * |
| * Returns 0 if the node was handled (including marking it obsolete) |
| * < 0 an if error occurred |
| */ |
| static int jffs2_add_tn_to_tree(struct jffs2_sb_info *c, |
| struct jffs2_readinode_info *rii, |
| struct jffs2_tmp_dnode_info *tn) |
| { |
| uint32_t fn_end = tn->fn->ofs + tn->fn->size; |
| struct jffs2_tmp_dnode_info *this, *ptn; |
| |
| dbg_readinode("insert fragment %#04x-%#04x, ver %u at %08x\n", tn->fn->ofs, fn_end, tn->version, ref_offset(tn->fn->raw)); |
| |
| /* If a node has zero dsize, we only have to keep if it if it might be the |
| node with highest version -- i.e. the one which will end up as f->metadata. |
| Note that such nodes won't be REF_UNCHECKED since there are no data to |
| check anyway. */ |
| if (!tn->fn->size) { |
| if (rii->mdata_tn) { |
| if (rii->mdata_tn->version < tn->version) { |
| /* We had a candidate mdata node already */ |
| dbg_readinode("kill old mdata with ver %d\n", rii->mdata_tn->version); |
| jffs2_kill_tn(c, rii->mdata_tn); |
| } else { |
| dbg_readinode("kill new mdata with ver %d (older than existing %d\n", |
| tn->version, rii->mdata_tn->version); |
| jffs2_kill_tn(c, tn); |
| return 0; |
| } |
| } |
| rii->mdata_tn = tn; |
| dbg_readinode("keep new mdata with ver %d\n", tn->version); |
| return 0; |
| } |
| |
| /* Find the earliest node which _may_ be relevant to this one */ |
| this = jffs2_lookup_tn(&rii->tn_root, tn->fn->ofs); |
| if (this) { |
| /* If the node is coincident with another at a lower address, |
| back up until the other node is found. It may be relevant */ |
| while (this->overlapped) { |
| ptn = tn_prev(this); |
| if (!ptn) { |
| /* |
| * We killed a node which set the overlapped |
| * flags during the scan. Fix it up. |
| */ |
| this->overlapped = 0; |
| break; |
| } |
| this = ptn; |
| } |
| dbg_readinode("'this' found %#04x-%#04x (%s)\n", this->fn->ofs, this->fn->ofs + this->fn->size, this->fn ? "data" : "hole"); |
| } |
| |
| while (this) { |
| if (this->fn->ofs > fn_end) |
| break; |
| dbg_readinode("Ponder this ver %d, 0x%x-0x%x\n", |
| this->version, this->fn->ofs, this->fn->size); |
| |
| if (this->version == tn->version) { |
| /* Version number collision means REF_PRISTINE GC. Accept either of them |
| as long as the CRC is correct. Check the one we have already... */ |
| if (!check_tn_node(c, this)) { |
| /* The one we already had was OK. Keep it and throw away the new one */ |
| dbg_readinode("Like old node. Throw away new\n"); |
| jffs2_kill_tn(c, tn); |
| return 0; |
| } else { |
| /* Who cares if the new one is good; keep it for now anyway. */ |
| dbg_readinode("Like new node. Throw away old\n"); |
| rb_replace_node(&this->rb, &tn->rb, &rii->tn_root); |
| jffs2_kill_tn(c, this); |
| /* Same overlapping from in front and behind */ |
| return 0; |
| } |
| } |
| if (this->version < tn->version && |
| this->fn->ofs >= tn->fn->ofs && |
| this->fn->ofs + this->fn->size <= fn_end) { |
| /* New node entirely overlaps 'this' */ |
| if (check_tn_node(c, tn)) { |
| dbg_readinode("new node bad CRC\n"); |
| jffs2_kill_tn(c, tn); |
| return 0; |
| } |
| /* ... and is good. Kill 'this' and any subsequent nodes which are also overlapped */ |
| while (this && this->fn->ofs + this->fn->size <= fn_end) { |
| struct jffs2_tmp_dnode_info *next = tn_next(this); |
| if (this->version < tn->version) { |
| tn_erase(this, &rii->tn_root); |
| dbg_readinode("Kill overlapped ver %d, 0x%x-0x%x\n", |
| this->version, this->fn->ofs, |
| this->fn->ofs+this->fn->size); |
| jffs2_kill_tn(c, this); |
| } |
| this = next; |
| } |
| dbg_readinode("Done killing overlapped nodes\n"); |
| continue; |
| } |
| if (this->version > tn->version && |
| this->fn->ofs <= tn->fn->ofs && |
| this->fn->ofs+this->fn->size >= fn_end) { |
| /* New node entirely overlapped by 'this' */ |
| if (!check_tn_node(c, this)) { |
| dbg_readinode("Good CRC on old node. Kill new\n"); |
| jffs2_kill_tn(c, tn); |
| return 0; |
| } |
| /* ... but 'this' was bad. Replace it... */ |
| dbg_readinode("Bad CRC on old overlapping node. Kill it\n"); |
| tn_erase(this, &rii->tn_root); |
| jffs2_kill_tn(c, this); |
| break; |
| } |
| |
| this = tn_next(this); |
| } |
| |
| /* We neither completely obsoleted nor were completely |
| obsoleted by an earlier node. Insert into the tree */ |
| { |
| struct rb_node *parent; |
| struct rb_node **link = &rii->tn_root.rb_node; |
| struct jffs2_tmp_dnode_info *insert_point = NULL; |
| |
| while (*link) { |
| parent = *link; |
| insert_point = rb_entry(parent, struct jffs2_tmp_dnode_info, rb); |
| if (tn->fn->ofs > insert_point->fn->ofs) |
| link = &insert_point->rb.rb_right; |
| else if (tn->fn->ofs < insert_point->fn->ofs || |
| tn->fn->size < insert_point->fn->size) |
| link = &insert_point->rb.rb_left; |
| else |
| link = &insert_point->rb.rb_right; |
| } |
| rb_link_node(&tn->rb, &insert_point->rb, link); |
| rb_insert_color(&tn->rb, &rii->tn_root); |
| } |
| |
| /* If there's anything behind that overlaps us, note it */ |
| this = tn_prev(tn); |
| if (this) { |
| while (1) { |
| if (this->fn->ofs + this->fn->size > tn->fn->ofs) { |
| dbg_readinode("Node is overlapped by %p (v %d, 0x%x-0x%x)\n", |
| this, this->version, this->fn->ofs, |
| this->fn->ofs+this->fn->size); |
| tn->overlapped = 1; |
| break; |
| } |
| if (!this->overlapped) |
| break; |
| |
| ptn = tn_prev(this); |
| if (!ptn) { |
| /* |
| * We killed a node which set the overlapped |
| * flags during the scan. Fix it up. |
| */ |
| this->overlapped = 0; |
| break; |
| } |
| this = ptn; |
| } |
| } |
| |
| /* If the new node overlaps anything ahead, note it */ |
| this = tn_next(tn); |
| while (this && this->fn->ofs < fn_end) { |
| this->overlapped = 1; |
| dbg_readinode("Node ver %d, 0x%x-0x%x is overlapped\n", |
| this->version, this->fn->ofs, |
| this->fn->ofs+this->fn->size); |
| this = tn_next(this); |
| } |
| return 0; |
| } |
| |
| /* Trivial function to remove the last node in the tree. Which by definition |
| has no right-hand -- so can be removed just by making its only child (if |
| any) take its place under its parent. */ |
| static void eat_last(struct rb_root *root, struct rb_node *node) |
| { |
| struct rb_node *parent = rb_parent(node); |
| struct rb_node **link; |
| |
| /* LAST! */ |
| BUG_ON(node->rb_right); |
| |
| if (!parent) |
| link = &root->rb_node; |
| else if (node == parent->rb_left) |
| link = &parent->rb_left; |
| else |
| link = &parent->rb_right; |
| |
| *link = node->rb_left; |
| /* Colour doesn't matter now. Only the parent pointer. */ |
| if (node->rb_left) |
| node->rb_left->rb_parent_color = node->rb_parent_color; |
| } |
| |
| /* We put this in reverse order, so we can just use eat_last */ |
| static void ver_insert(struct rb_root *ver_root, struct jffs2_tmp_dnode_info *tn) |
| { |
| struct rb_node **link = &ver_root->rb_node; |
| struct rb_node *parent = NULL; |
| struct jffs2_tmp_dnode_info *this_tn; |
| |
| while (*link) { |
| parent = *link; |
| this_tn = rb_entry(parent, struct jffs2_tmp_dnode_info, rb); |
| |
| if (tn->version > this_tn->version) |
| link = &parent->rb_left; |
| else |
| link = &parent->rb_right; |
| } |
| dbg_readinode("Link new node at %p (root is %p)\n", link, ver_root); |
| rb_link_node(&tn->rb, parent, link); |
| rb_insert_color(&tn->rb, ver_root); |
| } |
| |
| /* Build final, normal fragtree from tn tree. It doesn't matter which order |
| we add nodes to the real fragtree, as long as they don't overlap. And |
| having thrown away the majority of overlapped nodes as we went, there |
| really shouldn't be many sets of nodes which do overlap. If we start at |
| the end, we can use the overlap markers -- we can just eat nodes which |
| aren't overlapped, and when we encounter nodes which _do_ overlap we |
| sort them all into a temporary tree in version order before replaying them. */ |
| static int jffs2_build_inode_fragtree(struct jffs2_sb_info *c, |
| struct jffs2_inode_info *f, |
| struct jffs2_readinode_info *rii) |
| { |
| struct jffs2_tmp_dnode_info *pen, *last, *this; |
| struct rb_root ver_root = RB_ROOT; |
| uint32_t high_ver = 0; |
| |
| if (rii->mdata_tn) { |
| dbg_readinode("potential mdata is ver %d at %p\n", rii->mdata_tn->version, rii->mdata_tn); |
| high_ver = rii->mdata_tn->version; |
| rii->latest_ref = rii->mdata_tn->fn->raw; |
| } |
| #ifdef JFFS2_DBG_READINODE_MESSAGES |
| this = tn_last(&rii->tn_root); |
| while (this) { |
| dbg_readinode("tn %p ver %d range 0x%x-0x%x ov %d\n", this, this->version, this->fn->ofs, |
| this->fn->ofs+this->fn->size, this->overlapped); |
| this = tn_prev(this); |
| } |
| #endif |
| pen = tn_last(&rii->tn_root); |
| while ((last = pen)) { |
| pen = tn_prev(last); |
| |
| eat_last(&rii->tn_root, &last->rb); |
| ver_insert(&ver_root, last); |
| |
| if (unlikely(last->overlapped)) { |
| if (pen) |
| continue; |
| /* |
| * We killed a node which set the overlapped |
| * flags during the scan. Fix it up. |
| */ |
| last->overlapped = 0; |
| } |
| |
| /* Now we have a bunch of nodes in reverse version |
| order, in the tree at ver_root. Most of the time, |
| there'll actually be only one node in the 'tree', |
| in fact. */ |
| this = tn_last(&ver_root); |
| |
| while (this) { |
| struct jffs2_tmp_dnode_info *vers_next; |
| int ret; |
| vers_next = tn_prev(this); |
| eat_last(&ver_root, &this->rb); |
| if (check_tn_node(c, this)) { |
| dbg_readinode("node ver %d, 0x%x-0x%x failed CRC\n", |
| this->version, this->fn->ofs, |
| this->fn->ofs+this->fn->size); |
| jffs2_kill_tn(c, this); |
| } else { |
| if (this->version > high_ver) { |
| /* Note that this is different from the other |
| highest_version, because this one is only |
| counting _valid_ nodes which could give the |
| latest inode metadata */ |
| high_ver = this->version; |
| rii->latest_ref = this->fn->raw; |
| } |
| dbg_readinode("Add %p (v %d, 0x%x-0x%x, ov %d) to fragtree\n", |
| this, this->version, this->fn->ofs, |
| this->fn->ofs+this->fn->size, this->overlapped); |
| |
| ret = jffs2_add_full_dnode_to_inode(c, f, this->fn); |
| if (ret) { |
| /* Free the nodes in vers_root; let the caller |
| deal with the rest */ |
| JFFS2_ERROR("Add node to tree failed %d\n", ret); |
| while (1) { |
| vers_next = tn_prev(this); |
| if (check_tn_node(c, this)) |
| jffs2_mark_node_obsolete(c, this->fn->raw); |
| jffs2_free_full_dnode(this->fn); |
| jffs2_free_tmp_dnode_info(this); |
| this = vers_next; |
| if (!this) |
| break; |
| eat_last(&ver_root, &vers_next->rb); |
| } |
| return ret; |
| } |
| jffs2_free_tmp_dnode_info(this); |
| } |
| this = vers_next; |
| } |
| } |
| return 0; |
| } |
| |
| 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 = rb_parent(this); |
| 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_ROOT; |
| } |
| |
| static void jffs2_free_full_dirent_list(struct jffs2_full_dirent *fd) |
| { |
| struct jffs2_full_dirent *next; |
| |
| while (fd) { |
| next = fd->next; |
| jffs2_free_full_dirent(fd); |
| fd = next; |
| } |
| } |
| |
| /* 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; |
| dbg_noderef("node at 0x%08x is obsoleted. Ignoring.\n", ref_offset(ref)); |
| ref = ref->next_in_ino; |
| } |
| return NULL; |
| } |
| |
| /* |
| * Helper function for jffs2_get_inode_nodes(). |
| * It is called every time an directory entry node is found. |
| * |
| * Returns: 0 on success; |
| * 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, size_t read, |
| struct jffs2_readinode_info *rii) |
| { |
| struct jffs2_full_dirent *fd; |
| uint32_t crc; |
| |
| /* Obsoleted. This cannot happen, surely? dwmw2 20020308 */ |
| BUG_ON(ref_obsolete(ref)); |
| |
| crc = crc32(0, rd, sizeof(*rd) - 8); |
| if (unlikely(crc != je32_to_cpu(rd->node_crc))) { |
| JFFS2_NOTICE("header CRC failed on dirent node at %#08x: read %#08x, calculated %#08x\n", |
| ref_offset(ref), je32_to_cpu(rd->node_crc), crc); |
| jffs2_mark_node_obsolete(c, ref); |
| return 0; |
| } |
| |
| /* If we've never checked the CRCs on this node, check them now */ |
| if (ref_flags(ref) == REF_UNCHECKED) { |
| struct jffs2_eraseblock *jeb; |
| int len; |
| |
| /* Sanity check */ |
| if (unlikely(PAD((rd->nsize + sizeof(*rd))) != PAD(je32_to_cpu(rd->totlen)))) { |
| JFFS2_ERROR("illegal nsize in node at %#08x: nsize %#02x, totlen %#04x\n", |
| ref_offset(ref), rd->nsize, je32_to_cpu(rd->totlen)); |
| jffs2_mark_node_obsolete(c, ref); |
| return 0; |
| } |
| |
| 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) | dirent_node_state(rd); |
| spin_unlock(&c->erase_completion_lock); |
| } |
| |
| fd = jffs2_alloc_full_dirent(rd->nsize + 1); |
| if (unlikely(!fd)) |
| return -ENOMEM; |
| |
| fd->raw = ref; |
| fd->version = je32_to_cpu(rd->version); |
| fd->ino = je32_to_cpu(rd->ino); |
| fd->type = rd->type; |
| |
| if (fd->version > rii->highest_version) |
| rii->highest_version = fd->version; |
| |
| /* Pick out the mctime of the latest dirent */ |
| if(fd->version > rii->mctime_ver && je32_to_cpu(rd->mctime)) { |
| rii->mctime_ver = fd->version; |
| rii->latest_mctime = je32_to_cpu(rd->mctime); |
| } |
| |
| /* |
| * 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)) )); |
| |
| /* 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)) { |
| JFFS2_ERROR("read remainder of name: error %d\n", err); |
| jffs2_free_full_dirent(fd); |
| return -EIO; |
| } |
| } |
| |
| 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 |
| */ |
| jffs2_add_fd_to_list(c, fd, &rii->fds); |
| |
| return 0; |
| } |
| |
| /* |
| * Helper function for jffs2_get_inode_nodes(). |
| * It is called every time an inode node is found. |
| * |
| * Returns: 0 on success (possibly after marking a bad node 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, int rdlen, |
| struct jffs2_readinode_info *rii) |
| { |
| struct jffs2_tmp_dnode_info *tn; |
| uint32_t len, csize; |
| int ret = 0; |
| uint32_t crc; |
| |
| /* Obsoleted. This cannot happen, surely? dwmw2 20020308 */ |
| BUG_ON(ref_obsolete(ref)); |
| |
| crc = crc32(0, rd, sizeof(*rd) - 8); |
| if (unlikely(crc != je32_to_cpu(rd->node_crc))) { |
| JFFS2_NOTICE("node CRC failed on dnode at %#08x: read %#08x, calculated %#08x\n", |
| ref_offset(ref), je32_to_cpu(rd->node_crc), crc); |
| jffs2_mark_node_obsolete(c, ref); |
| return 0; |
| } |
| |
| tn = jffs2_alloc_tmp_dnode_info(); |
| if (!tn) { |
| JFFS2_ERROR("failed to allocate tn (%zu 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) { |
| |
| /* 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)))) { |
| JFFS2_WARNING("inode node header CRC is corrupted at %#08x\n", ref_offset(ref)); |
| jffs2_dbg_dump_node(c, ref_offset(ref)); |
| jffs2_mark_node_obsolete(c, ref); |
| goto free_out; |
| } |
| |
| 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 with |
| * !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); |
| tn->partial_crc = crc32(0, buf, len); |
| |
| dbg_readinode("Calculates CRC (%#08x) for %d bytes, csize %d\n", tn->partial_crc, len, csize); |
| |
| /* If we actually calculated the whole data CRC |
| * and it is wrong, drop the node. */ |
| if (len >= csize && unlikely(tn->partial_crc != je32_to_cpu(rd->data_crc))) { |
| JFFS2_NOTICE("wrong data CRC in data node at 0x%08x: read %#08x, calculated %#08x.\n", |
| ref_offset(ref), tn->partial_crc, je32_to_cpu(rd->data_crc)); |
| jffs2_mark_node_obsolete(c, ref); |
| goto free_out; |
| } |
| |
| } 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; |
| |
| 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); |
| } |
| } |
| |
| tn->fn = jffs2_alloc_full_dnode(); |
| if (!tn->fn) { |
| JFFS2_ERROR("alloc fn failed\n"); |
| 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; |
| tn->overlapped = 0; |
| |
| if (tn->version > rii->highest_version) |
| rii->highest_version = tn->version; |
| |
| /* 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) && csize) |
| tn->fn->size = csize; |
| else // normal case... |
| tn->fn->size = je32_to_cpu(rd->dsize); |
| |
| dbg_readinode2("dnode @%08x: ver %u, offset %#04x, dsize %#04x, csize %#04x\n", |
| ref_offset(ref), je32_to_cpu(rd->version), |
| je32_to_cpu(rd->offset), je32_to_cpu(rd->dsize), csize); |
| |
| ret = jffs2_add_tn_to_tree(c, rii, tn); |
| |
| if (ret) { |
| jffs2_free_full_dnode(tn->fn); |
| free_out: |
| jffs2_free_tmp_dnode_info(tn); |
| return ret; |
| } |
| #ifdef JFFS2_DBG_READINODE2_MESSAGES |
| dbg_readinode2("After adding ver %d:\n", je32_to_cpu(rd->version)); |
| tn = tn_first(&rii->tn_root); |
| while (tn) { |
| dbg_readinode2("%p: v %d r 0x%x-0x%x ov %d\n", |
| tn, tn->version, tn->fn->ofs, |
| tn->fn->ofs+tn->fn->size, tn->overlapped); |
| tn = tn_next(tn); |
| } |
| #endif |
| return 0; |
| } |
| |
| /* |
| * Helper function for jffs2_get_inode_nodes(). |
| * It is called every time an unknown node is found. |
| * |
| * Returns: 0 on success; |
| * 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) |
| { |
| /* We don't mark unknown nodes as REF_UNCHECKED */ |
| if (ref_flags(ref) == REF_UNCHECKED) { |
| JFFS2_ERROR("REF_UNCHECKED but unknown node at %#08x\n", |
| ref_offset(ref)); |
| JFFS2_ERROR("Node is {%04x,%04x,%08x,%08x}. Please report this error.\n", |
| je16_to_cpu(un->magic), je16_to_cpu(un->nodetype), |
| je32_to_cpu(un->totlen), je32_to_cpu(un->hdr_crc)); |
| jffs2_mark_node_obsolete(c, ref); |
| return 0; |
| } |
| |
| un->nodetype = cpu_to_je16(JFFS2_NODE_ACCURATE | je16_to_cpu(un->nodetype)); |
| |
| switch(je16_to_cpu(un->nodetype) & JFFS2_COMPAT_MASK) { |
| |
| case JFFS2_FEATURE_INCOMPAT: |
| JFFS2_ERROR("unknown INCOMPAT nodetype %#04X at %#08x\n", |
| je16_to_cpu(un->nodetype), ref_offset(ref)); |
| /* EEP */ |
| BUG(); |
| break; |
| |
| case JFFS2_FEATURE_ROCOMPAT: |
| JFFS2_ERROR("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: |
| JFFS2_NOTICE("unknown RWCOMPAT_COPY nodetype %#04X at %#08x\n", |
| je16_to_cpu(un->nodetype), ref_offset(ref)); |
| break; |
| |
| case JFFS2_FEATURE_RWCOMPAT_DELETE: |
| JFFS2_NOTICE("unknown RWCOMPAT_DELETE nodetype %#04X at %#08x\n", |
| je16_to_cpu(un->nodetype), ref_offset(ref)); |
| jffs2_mark_node_obsolete(c, ref); |
| return 0; |
| } |
| |
| 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 success; |
| * negative error code on failure. |
| */ |
| static int read_more(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref, |
| int needed_len, int *rdlen, unsigned char *buf) |
| { |
| int err, to_read = needed_len - *rdlen; |
| size_t retlen; |
| uint32_t offs; |
| |
| if (jffs2_is_writebuffered(c)) { |
| int rem = to_read % c->wbuf_pagesize; |
| |
| if (rem) |
| to_read += c->wbuf_pagesize - rem; |
| } |
| |
| /* We need to read more data */ |
| offs = ref_offset(ref) + *rdlen; |
| |
| dbg_readinode("read more %d bytes\n", to_read); |
| |
| err = jffs2_flash_read(c, offs, to_read, &retlen, buf + *rdlen); |
| if (err) { |
| JFFS2_ERROR("can not read %d bytes from 0x%08x, " |
| "error code: %d.\n", to_read, offs, err); |
| return err; |
| } |
| |
| if (retlen < to_read) { |
| JFFS2_ERROR("short read at %#08x: %zu instead of %d.\n", |
| offs, retlen, to_read); |
| return -EIO; |
| } |
| |
| *rdlen += to_read; |
| return 0; |
| } |
| |
| /* Get tmp_dnode_info and full_dirent for all non-obsolete nodes associated |
| with this ino. Perform a preliminary ordering on data nodes, throwing away |
| those which are completely obsoleted by newer ones. The naïve approach we |
| use to take of just returning them _all_ in version order will cause us to |
| run out of memory in certain degenerate cases. */ |
| static int jffs2_get_inode_nodes(struct jffs2_sb_info *c, struct jffs2_inode_info *f, |
| struct jffs2_readinode_info *rii) |
| { |
| struct jffs2_raw_node_ref *ref, *valid_ref; |
| unsigned char *buf = NULL; |
| union jffs2_node_union *node; |
| size_t retlen; |
| int len, err; |
| |
| rii->mctime_ver = 0; |
| |
| dbg_readinode("ino #%u\n", f->inocache->ino); |
| |
| /* FIXME: in case of NOR and available ->point() this |
| * needs to be fixed. */ |
| len = sizeof(union jffs2_node_union) + c->wbuf_pagesize; |
| 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("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(); |
| |
| /* |
| * 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 header is |
| * of size = JFFS2_MIN_NODE_HEADER. |
| */ |
| len = JFFS2_MIN_NODE_HEADER; |
| if (jffs2_is_writebuffered(c)) { |
| int end, rem; |
| |
| /* |
| * We are about to read JFFS2_MIN_NODE_HEADER bytes, |
| * but this flash has some minimal I/O unit. It is |
| * possible that we'll need to read more soon, so read |
| * up to the next min. I/O unit, in order not to |
| * re-read the same min. I/O unit twice. |
| */ |
| end = ref_offset(ref) + len; |
| rem = end % c->wbuf_pagesize; |
| if (rem) |
| end += c->wbuf_pagesize - rem; |
| len = end - ref_offset(ref); |
| } |
| |
| 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), len, &retlen, buf); |
| if (err) { |
| 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: %zu instead of %d.\n", ref_offset(ref), retlen, len); |
| err = -EIO; |
| goto free_out; |
| } |
| |
| node = (union jffs2_node_union *)buf; |
| |
| /* No need to mask in the valid bit; it shouldn't be invalid */ |
| if (je32_to_cpu(node->u.hdr_crc) != crc32(0, node, sizeof(node->u)-4)) { |
| JFFS2_NOTICE("Node header CRC failed at %#08x. {%04x,%04x,%08x,%08x}\n", |
| ref_offset(ref), je16_to_cpu(node->u.magic), |
| je16_to_cpu(node->u.nodetype), |
| je32_to_cpu(node->u.totlen), |
| je32_to_cpu(node->u.hdr_crc)); |
| jffs2_dbg_dump_node(c, ref_offset(ref)); |
| jffs2_mark_node_obsolete(c, ref); |
| goto cont; |
| } |
| if (je16_to_cpu(node->u.magic) != JFFS2_MAGIC_BITMASK) { |
| /* Not a JFFS2 node, whinge and move on */ |
| JFFS2_NOTICE("Wrong magic bitmask 0x%04x in node header at %#08x.\n", |
| je16_to_cpu(node->u.magic), ref_offset(ref)); |
| jffs2_mark_node_obsolete(c, ref); |
| goto cont; |
| } |
| |
| switch (je16_to_cpu(node->u.nodetype)) { |
| |
| case JFFS2_NODETYPE_DIRENT: |
| |
| if (JFFS2_MIN_NODE_HEADER < sizeof(struct jffs2_raw_dirent) && |
| len < sizeof(struct jffs2_raw_dirent)) { |
| err = read_more(c, ref, sizeof(struct jffs2_raw_dirent), &len, buf); |
| if (unlikely(err)) |
| goto free_out; |
| } |
| |
| err = read_direntry(c, ref, &node->d, retlen, rii); |
| if (unlikely(err)) |
| goto free_out; |
| |
| break; |
| |
| case JFFS2_NODETYPE_INODE: |
| |
| if (JFFS2_MIN_NODE_HEADER < sizeof(struct jffs2_raw_inode) && |
| len < sizeof(struct jffs2_raw_inode)) { |
| err = read_more(c, ref, sizeof(struct jffs2_raw_inode), &len, buf); |
| if (unlikely(err)) |
| goto free_out; |
| } |
| |
| err = read_dnode(c, ref, &node->i, len, rii); |
| if (unlikely(err)) |
| goto free_out; |
| |
| break; |
| |
| default: |
| if (JFFS2_MIN_NODE_HEADER < sizeof(struct jffs2_unknown_node) && |
| len < sizeof(struct jffs2_unknown_node)) { |
| err = read_more(c, ref, sizeof(struct jffs2_unknown_node), &len, buf); |
| if (unlikely(err)) |
| goto free_out; |
| } |
| |
| err = read_unknown(c, ref, &node->u); |
| if (unlikely(err)) |
| goto free_out; |
| |
| } |
| cont: |
| spin_lock(&c->erase_completion_lock); |
| } |
| |
| spin_unlock(&c->erase_completion_lock); |
| kfree(buf); |
| |
| f->highest_version = rii->highest_version; |
| |
| dbg_readinode("nodes of inode #%u were read, the highest version is %u, latest_mctime %u, mctime_ver %u.\n", |
| f->inocache->ino, rii->highest_version, rii->latest_mctime, |
| rii->mctime_ver); |
| return 0; |
| |
| free_out: |
| jffs2_free_tmp_dnode_info_list(&rii->tn_root); |
| jffs2_free_full_dirent_list(rii->fds); |
| rii->fds = NULL; |
| kfree(buf); |
| return err; |
| } |
| |
| 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_readinode_info rii; |
| uint32_t crc, new_size; |
| size_t retlen; |
| int ret; |
| |
| dbg_readinode("ino #%u pino/nlink is %d\n", f->inocache->ino, |
| f->inocache->pino_nlink); |
| |
| memset(&rii, 0, sizeof(rii)); |
| |
| /* Grab all nodes relevant to this ino */ |
| ret = jffs2_get_inode_nodes(c, f, &rii); |
| |
| if (ret) { |
| JFFS2_ERROR("cannot read nodes for ino %u, returned error is %d\n", f->inocache->ino, ret); |
| if (f->inocache->state == INO_STATE_READING) |
| jffs2_set_inocache_state(c, f->inocache, INO_STATE_CHECKEDABSENT); |
| return ret; |
| } |
| |
| ret = jffs2_build_inode_fragtree(c, f, &rii); |
| if (ret) { |
| JFFS2_ERROR("Failed to build final fragtree for inode #%u: error %d\n", |
| f->inocache->ino, ret); |
| if (f->inocache->state == INO_STATE_READING) |
| jffs2_set_inocache_state(c, f->inocache, INO_STATE_CHECKEDABSENT); |
| jffs2_free_tmp_dnode_info_list(&rii.tn_root); |
| /* FIXME: We could at least crc-check them all */ |
| if (rii.mdata_tn) { |
| jffs2_free_full_dnode(rii.mdata_tn->fn); |
| jffs2_free_tmp_dnode_info(rii.mdata_tn); |
| rii.mdata_tn = NULL; |
| } |
| return ret; |
| } |
| |
| if (rii.mdata_tn) { |
| if (rii.mdata_tn->fn->raw == rii.latest_ref) { |
| f->metadata = rii.mdata_tn->fn; |
| jffs2_free_tmp_dnode_info(rii.mdata_tn); |
| } else { |
| jffs2_kill_tn(c, rii.mdata_tn); |
| } |
| rii.mdata_tn = NULL; |
| } |
| |
| f->dents = rii.fds; |
| |
| jffs2_dbg_fragtree_paranoia_check_nolock(f); |
| |
| if (unlikely(!rii.latest_ref)) { |
| /* No data nodes for this inode. */ |
| if (f->inocache->ino != 1) { |
| JFFS2_WARNING("no data nodes found for ino #%u\n", f->inocache->ino); |
| if (!rii.fds) { |
| if (f->inocache->state == INO_STATE_READING) |
| jffs2_set_inocache_state(c, f->inocache, INO_STATE_CHECKEDABSENT); |
| return -EIO; |
| } |
| JFFS2_NOTICE("but it has children so we fake some modes for it\n"); |
| } |
| latest_node->mode = cpu_to_jemode(S_IFDIR|S_IRUGO|S_IWUSR|S_IXUGO); |
| latest_node->version = cpu_to_je32(0); |
| latest_node->atime = latest_node->ctime = latest_node->mtime = cpu_to_je32(0); |
| latest_node->isize = cpu_to_je32(0); |
| latest_node->gid = cpu_to_je16(0); |
| latest_node->uid = cpu_to_je16(0); |
| if (f->inocache->state == INO_STATE_READING) |
| jffs2_set_inocache_state(c, f->inocache, INO_STATE_PRESENT); |
| return 0; |
| } |
| |
| ret = jffs2_flash_read(c, ref_offset(rii.latest_ref), sizeof(*latest_node), &retlen, (void *)latest_node); |
| if (ret || retlen != sizeof(*latest_node)) { |
| JFFS2_ERROR("failed to read from flash: error %d, %zd of %zd bytes read\n", |
| ret, retlen, sizeof(*latest_node)); |
| /* FIXME: If this fails, there seems to be a memory leak. Find it. */ |
| mutex_unlock(&f->sem); |
| jffs2_do_clear_inode(c, f); |
| return ret?ret:-EIO; |
| } |
| |
| crc = crc32(0, latest_node, sizeof(*latest_node)-8); |
| if (crc != je32_to_cpu(latest_node->node_crc)) { |
| JFFS2_ERROR("CRC failed for read_inode of inode %u at physical location 0x%x\n", |
| f->inocache->ino, ref_offset(rii.latest_ref)); |
| mutex_unlock(&f->sem); |
| jffs2_do_clear_inode(c, f); |
| return -EIO; |
| } |
| |
| switch(jemode_to_cpu(latest_node->mode) & S_IFMT) { |
| case S_IFDIR: |
| if (rii.mctime_ver > je32_to_cpu(latest_node->version)) { |
| /* The times in the latest_node are actually older than |
| mctime in the latest dirent. Cheat. */ |
| latest_node->ctime = latest_node->mtime = cpu_to_je32(rii.latest_mctime); |
| } |
| break; |
| |
| |
| case S_IFREG: |
| /* If it was a regular file, truncate it to the latest node's isize */ |
| new_size = jffs2_truncate_fragtree(c, &f->fragtree, je32_to_cpu(latest_node->isize)); |
| if (new_size != je32_to_cpu(latest_node->isize)) { |
| JFFS2_WARNING("Truncating ino #%u to %d bytes failed because it only had %d bytes to start with!\n", |
| f->inocache->ino, je32_to_cpu(latest_node->isize), new_size); |
| latest_node->isize = cpu_to_je32(new_size); |
| } |
| break; |
| |
| case S_IFLNK: |
| /* Hack to work around broken isize in old symlink code. |
| Remove this when dwmw2 comes to his senses and stops |
| symlinks from being an entirely gratuitous special |
| case. */ |
| if (!je32_to_cpu(latest_node->isize)) |
| latest_node->isize = latest_node->dsize; |
| |
| if (f->inocache->state != INO_STATE_CHECKING) { |
| /* Symlink's inode data is the target path. Read it and |
| * keep in RAM to facilitate quick follow symlink |
| * operation. */ |
| f->target = kmalloc(je32_to_cpu(latest_node->csize) + 1, GFP_KERNEL); |
| if (!f->target) { |
| JFFS2_ERROR("can't allocate %d bytes of memory for the symlink target path cache\n", je32_to_cpu(latest_node->csize)); |
| mutex_unlock(&f->sem); |
| jffs2_do_clear_inode(c, f); |
| return -ENOMEM; |
| } |
| |
| ret = jffs2_flash_read(c, ref_offset(rii.latest_ref) + sizeof(*latest_node), |
| je32_to_cpu(latest_node->csize), &retlen, (char *)f->target); |
| |
| if (ret || retlen != je32_to_cpu(latest_node->csize)) { |
| if (retlen != je32_to_cpu(latest_node->csize)) |
| ret = -EIO; |
| kfree(f->target); |
| f->target = NULL; |
| mutex_unlock(&f->sem); |
| jffs2_do_clear_inode(c, f); |
| return ret; |
| } |
| |
| f->target[je32_to_cpu(latest_node->csize)] = '\0'; |
| dbg_readinode("symlink's target '%s' cached\n", f->target); |
| } |
| |
| /* fall through... */ |
| |
| case S_IFBLK: |
| case S_IFCHR: |
| /* Certain inode types should have only one data node, and it's |
| kept as the metadata node */ |
| if (f->metadata) { |
| JFFS2_ERROR("Argh. Special inode #%u with mode 0%o had metadata node\n", |
| f->inocache->ino, jemode_to_cpu(latest_node->mode)); |
| mutex_unlock(&f->sem); |
| jffs2_do_clear_inode(c, f); |
| return -EIO; |
| } |
| if (!frag_first(&f->fragtree)) { |
| JFFS2_ERROR("Argh. Special inode #%u with mode 0%o has no fragments\n", |
| f->inocache->ino, jemode_to_cpu(latest_node->mode)); |
| mutex_unlock(&f->sem); |
| jffs2_do_clear_inode(c, f); |
| return -EIO; |
| } |
| /* ASSERT: f->fraglist != NULL */ |
| if (frag_next(frag_first(&f->fragtree))) { |
| JFFS2_ERROR("Argh. Special inode #%u with mode 0x%x had more than one node\n", |
| f->inocache->ino, jemode_to_cpu(latest_node->mode)); |
| /* FIXME: Deal with it - check crc32, check for duplicate node, check times and discard the older one */ |
| mutex_unlock(&f->sem); |
| jffs2_do_clear_inode(c, f); |
| return -EIO; |
| } |
| /* OK. We're happy */ |
| f->metadata = frag_first(&f->fragtree)->node; |
| jffs2_free_node_frag(frag_first(&f->fragtree)); |
| f->fragtree = RB_ROOT; |
| break; |
| } |
| if (f->inocache->state == INO_STATE_READING) |
| jffs2_set_inocache_state(c, f->inocache, INO_STATE_PRESENT); |
| |
| 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) |
| { |
| dbg_readinode("read inode #%u\n", ino); |
| |
| retry_inocache: |
| spin_lock(&c->inocache_lock); |
| f->inocache = jffs2_get_ino_cache(c, ino); |
| |
| 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. */ |
| dbg_readinode("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. */ |
| JFFS2_ERROR("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) { |
| JFFS2_ERROR("cannot allocate inocache for root inode\n"); |
| return -ENOMEM; |
| } |
| dbg_readinode("creating inocache for root inode\n"); |
| memset(f->inocache, 0, sizeof(struct jffs2_inode_cache)); |
| f->inocache->ino = f->inocache->pino_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) { |
| JFFS2_ERROR("requestied to read an 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 = kzalloc(sizeof(*f), GFP_KERNEL); |
| int ret; |
| |
| if (!f) |
| return -ENOMEM; |
| |
| mutex_init(&f->sem); |
| mutex_lock(&f->sem); |
| f->inocache = ic; |
| |
| ret = jffs2_do_read_inode_internal(c, f, &n); |
| if (!ret) { |
| mutex_unlock(&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; |
| int deleted; |
| |
| jffs2_xattr_delete_inode(c, f->inocache); |
| mutex_lock(&f->sem); |
| deleted = f->inocache && !f->inocache->pino_nlink; |
| |
| if (f->inocache && f->inocache->state != INO_STATE_CHECKING) |
| jffs2_set_inocache_state(c, f->inocache, INO_STATE_CLEARING); |
| |
| if (f->metadata) { |
| if (deleted) |
| jffs2_mark_node_obsolete(c, f->metadata->raw); |
| jffs2_free_full_dnode(f->metadata); |
| } |
| |
| jffs2_kill_fragtree(&f->fragtree, deleted?c:NULL); |
| |
| if (f->target) { |
| kfree(f->target); |
| f->target = NULL; |
| } |
| |
| fds = f->dents; |
| while(fds) { |
| fd = fds; |
| fds = fd->next; |
| jffs2_free_full_dirent(fd); |
| } |
| |
| if (f->inocache && f->inocache->state != INO_STATE_CHECKING) { |
| jffs2_set_inocache_state(c, f->inocache, INO_STATE_CHECKEDABSENT); |
| if (f->inocache->nodes == (void *)f->inocache) |
| jffs2_del_ino_cache(c, f->inocache); |
| } |
| |
| mutex_unlock(&f->sem); |
| } |