static int jffs2_sanitycheck_fragtree(struct jffs2_inode_info *f)
{
struct jffs2_node_frag *frag;
int bitched = 0;
for (frag = frag_first(&f->fragtree); frag; frag = frag_next(frag)) {
struct jffs2_full_dnode *fn = frag->node;
if (!fn || !fn->raw)
continue;
if (ref_flags(fn->raw) == REF_PRISTINE) {
if (fn->frags > 1) {
printk(KERN_WARNING "REF_PRISTINE node at 0x%08x had %d frags. Tell dwmw2\n", ref_offset(fn->raw), fn->frags);
bitched = 1;
}
/* A hole node which isn't multi-page should be garbage-collected
and merged anyway, so we just check for the frag size here,
rather than mucking around with actually reading the node
and checking the compression type, which is the real way
to tell a hole node. */
if (frag->ofs & (PAGE_CACHE_SIZE-1) && frag_prev(frag) && frag_prev(frag)->size < PAGE_CACHE_SIZE && frag_prev(frag)->node) {
printk(KERN_WARNING "REF_PRISTINE node at 0x%08x had a previous non-hole frag in the same page. Tell dwmw2\n",
ref_offset(fn->raw));
bitched = 1;
}
if ((frag->ofs+frag->size) & (PAGE_CACHE_SIZE-1) && frag_next(frag) && frag_next(frag)->size < PAGE_CACHE_SIZE && frag_next(frag)->node) {
printk(KERN_WARNING "REF_PRISTINE node at 0x%08x (%08x-%08x) had a following non-hole frag in the same page. Tell dwmw2\n",
ref_offset(fn->raw), frag->ofs, frag->ofs+frag->size);
bitched = 1;
}
}
}
if (bitched) {
struct jffs2_node_frag *thisfrag;
printk(KERN_WARNING "Inode is #%u\n", f->inocache->ino);
thisfrag = frag_first(&f->fragtree);
while (thisfrag) {
if (!thisfrag->node) {
printk("Frag @0x%x-0x%x; node-less hole\n",
thisfrag->ofs, thisfrag->size + thisfrag->ofs);
} else if (!thisfrag->node->raw) {
printk("Frag @0x%x-0x%x; raw-less hole\n",
thisfrag->ofs, thisfrag->size + thisfrag->ofs);
} else {
printk("Frag @0x%x-0x%x; raw at 0x%08x(%d) (0x%x-0x%x)\n",
thisfrag->ofs, thisfrag->size + thisfrag->ofs,
ref_offset(thisfrag->node->raw), ref_flags(thisfrag->node->raw),
thisfrag->node->ofs, thisfrag->node->ofs+thisfrag->node->size);
}
thisfrag = frag_next(thisfrag);
}
}
return bitched;
}
static void jffs2_print_fragtree(struct rb_root *list, int permitbug)
{
struct jffs2_node_frag *this = frag_first(list);
uint32_t lastofs = 0;
int buggy = 0;
while(this) {
if (this->node)
printk(KERN_DEBUG "frag %04x-%04x: 0x%08x(%d) on flash (*%p). left (%p), right (%p), parent (%p)\n",
this->ofs, this->ofs+this->size, ref_offset(this->node->raw), ref_flags(this->node->raw),
this, frag_left(this), frag_right(this), frag_parent(this));
else
printk(KERN_DEBUG "frag %04x-%04x: hole (*%p). left (%p} right (%p), parent (%p)\n", this->ofs,
this->ofs+this->size, this, frag_left(this), frag_right(this), frag_parent(this));
if (this->ofs != lastofs)
buggy = 1;
lastofs = this->ofs+this->size;
this = frag_next(this);
}
if (buggy && !permitbug) {
printk(KERN_CRIT "Frag tree got a hole in it\n");
BUG();
}
}
static int jffs2_do_read_inode_internal(struct jffs2_sb_info *c,
struct jffs2_inode_info *f,
struct jffs2_raw_inode *latest_node)
{
struct jffs2_tmp_dnode_info *tn;
struct rb_root tn_list;
struct rb_node *rb, *repl_rb;
struct jffs2_full_dirent *fd_list;
struct jffs2_full_dnode *fn, *first_fn = NULL;
uint32_t crc;
uint32_t latest_mctime, mctime_ver;
size_t retlen;
int ret;
dbg_readinode("ino #%u nlink is %d\n", f->inocache->ino, f->inocache->nlink);
/* Grab all nodes relevant to this ino */
ret = jffs2_get_inode_nodes(c, f, &tn_list, &fd_list, &f->highest_version, &latest_mctime, &mctime_ver);
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;
}
f->dents = fd_list;
rb = rb_first(&tn_list);
while (rb) {
cond_resched();
tn = rb_entry(rb, struct jffs2_tmp_dnode_info, rb);
fn = tn->fn;
ret = 1;
dbg_readinode("consider node ver %u, phys offset "
"%#08x(%d), range %u-%u.\n", tn->version,
ref_offset(fn->raw), ref_flags(fn->raw),
fn->ofs, fn->ofs + fn->size);
if (fn->size) {
ret = jffs2_add_older_frag_to_fragtree(c, f, tn);
/* TODO: the error code isn't checked, check it */
jffs2_dbg_fragtree_paranoia_check_nolock(f);
BUG_ON(ret < 0);
if (!first_fn && ret == 0)
first_fn = fn;
} else if (!first_fn) {
first_fn = fn;
f->metadata = fn;
ret = 0; /* Prevent freeing the metadata update node */
} else
jffs2_mark_node_obsolete(c, fn->raw);
BUG_ON(rb->rb_left);
if (rb->rb_parent && rb->rb_parent->rb_left == rb) {
/* We were then left-hand child of our parent. We need
* to move our own right-hand child into our place. */
repl_rb = rb->rb_right;
if (repl_rb)
repl_rb->rb_parent = rb->rb_parent;
} else
repl_rb = NULL;
rb = rb_next(rb);
/* Remove the spent tn from the tree; don't bother rebalancing
* but put our right-hand child in our own place. */
if (tn->rb.rb_parent) {
if (tn->rb.rb_parent->rb_left == &tn->rb)
tn->rb.rb_parent->rb_left = repl_rb;
else if (tn->rb.rb_parent->rb_right == &tn->rb)
tn->rb.rb_parent->rb_right = repl_rb;
else BUG();
} else if (tn->rb.rb_right)
tn->rb.rb_right->rb_parent = NULL;
jffs2_free_tmp_dnode_info(tn);
if (ret) {
dbg_readinode("delete dnode %u-%u.\n",
fn->ofs, fn->ofs + fn->size);
jffs2_free_full_dnode(fn);
}
}
jffs2_dbg_fragtree_paranoia_check_nolock(f);
BUG_ON(first_fn && ref_obsolete(first_fn->raw));
fn = first_fn;
if (unlikely(!first_fn)) {
/* No data nodes for this inode. */
if (f->inocache->ino != 1) {
JFFS2_WARNING("no data nodes found for ino #%u\n", f->inocache->ino);
if (!fd_list) {
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(fn->raw), 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. */
up(&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(fn->raw));
up(&f->sem);
jffs2_do_clear_inode(c, f);
return -EIO;
}
switch(jemode_to_cpu(latest_node->mode) & S_IFMT) {
case S_IFDIR:
if (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(latest_mctime);
}
break;
case S_IFREG:
/* If it was a regular file, truncate it to the latest node's isize */
jffs2_truncate_fragtree(c, &f->fragtree, je32_to_cpu(latest_node->isize));
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));
up(&f->sem);
jffs2_do_clear_inode(c, f);
return -ENOMEM;
}
ret = jffs2_flash_read(c, ref_offset(fn->raw) + 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;
up(&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));
up(&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));
up(&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 */
up(&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;
}
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;
}
