/*
* Helper function for jffs2_get_inode_nodes().
* The function detects whether more data should be read and reads it if yes.
*
* Returns: 0 on succes;
* negative error code on failure.
*/
static int read_more(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref,
int right_size, int *rdlen, unsigned char *buf, unsigned char *bufstart)
{
int right_len, len;
uint32_t offs;
if (jffs2_is_writebuffered(c)) {
right_len = c->wbuf_pagesize - (bufstart - buf);
if (right_size + (int)(bufstart - buf) > c->wbuf_pagesize)
right_len += c->wbuf_pagesize;
} else
right_len = right_size;
if (*rdlen == right_len)
return 0;
/* We need to read more data */
offs = ref_offset(ref) + *rdlen;
if (jffs2_is_writebuffered(c)) {
bufstart = buf + c->wbuf_pagesize;
len = c->wbuf_pagesize;
} else {
bufstart = buf + *rdlen;
len = right_size - *rdlen;
}
dbg_readinode("read more %d bytes\n", len);
if (jffs2_flash_read_safe(c, offs, len, bufstart))
return -EIO;
*rdlen = right_len;
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;
}
/*
* Helper function for jffs2_get_inode_nodes().
* The function detects whether more data should be read and reads it if yes.
*
* Returns: 0 on succes;
* negative error code on failure.
*/
static int read_more(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref,
int right_size, int *rdlen, unsigned char *buf, unsigned char *bufstart)
{
int right_len, err, len;
size_t retlen;
uint32_t offs;
if (jffs2_is_writebuffered(c)) {
right_len = c->wbuf_pagesize - (bufstart - buf);
if (right_size + (int)(bufstart - buf) > c->wbuf_pagesize)
right_len += c->wbuf_pagesize;
} else
right_len = right_size;
if (*rdlen == right_len)
return 0;
/* We need to read more data */
offs = ref_offset(ref) + *rdlen;
if (jffs2_is_writebuffered(c)) {
bufstart = buf + c->wbuf_pagesize;
len = c->wbuf_pagesize;
} else {
bufstart = buf + *rdlen;
len = right_size - *rdlen;
}
dbg_readinode("read more %d bytes\n", len);
err = jffs2_flash_read(c, offs, len, &retlen, bufstart);
if (err) {
JFFS2_ERROR("can not read %d bytes from 0x%08x, "
"error code: %d.\n", len, offs, err);
return err;
}
if (retlen < len) {
JFFS2_ERROR("short read at %#08x: %d instead of %d.\n",
offs, retlen, len);
return -EIO;
}
*rdlen = right_len;
return 0;
}
static int jffs2_sync_fs(struct super_block *sb, int wait)
{
struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
if (jffs2_is_writebuffered(c))
cancel_delayed_work_sync(&c->wbuf_dwork);
#endif
mutex_lock(&c->alloc_sem);
jffs2_flush_wbuf_pad(c);
mutex_unlock(&c->alloc_sem);
return 0;
}
int jffs2_flash_direct_writev(struct jffs2_sb_info *c, const struct kvec *vecs,
unsigned long count, loff_t to, size_t *retlen)
{
if (!jffs2_is_writebuffered(c)) {
if (jffs2_sum_active()) {
int res;
res = jffs2_sum_add_kvec(c, vecs, count, (uint32_t) to);
if (res) {
return res;
}
}
}
if (c->mtd->writev)
return c->mtd->writev(c->mtd, vecs, count, to, retlen);
else {
return mtd_fake_writev(c->mtd, vecs, count, to, retlen);
}
}
/* Get tmp_dnode_info and full_dirent for all non-obsolete nodes associated
with this ino, returning the former in order of version */
static int jffs2_get_inode_nodes(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
struct rb_root *tnp, struct jffs2_full_dirent **fdp,
uint32_t *highest_version, uint32_t *latest_mctime,
uint32_t *mctime_ver)
{
struct jffs2_raw_node_ref *ref, *valid_ref;
struct rb_root ret_tn = RB_ROOT;
struct jffs2_full_dirent *ret_fd = NULL;
unsigned char *buf = NULL;
union jffs2_node_union *node;
size_t retlen;
int len, err;
*mctime_ver = 0;
dbg_readinode("ino #%u\n", f->inocache->ino);
if (jffs2_is_writebuffered(c)) {
/*
* If we have the write buffer, we assume the minimal I/O unit
* is c->wbuf_pagesize. We implement some optimizations which in
* this case and we need a temporary buffer of size =
* 2*c->wbuf_pagesize bytes (see comments in read_dnode()).
* Basically, we want to read not only the node header, but the
* whole wbuf (NAND page in case of NAND) or 2, if the node
* header overlaps the border between the 2 wbufs.
*/
len = 2*c->wbuf_pagesize;
} else {
/*
* When there is no write buffer, the size of the temporary
* buffer is the size of the larges node header.
*/
len = sizeof(union jffs2_node_union);
}
/* FIXME: in case of NOR and available ->point() this
* needs to be fixed. */
buf = kmalloc(len, GFP_KERNEL);
if (!buf)
return -ENOMEM;
spin_lock(&c->erase_completion_lock);
valid_ref = jffs2_first_valid_node(f->inocache->nodes);
if (!valid_ref && f->inocache->ino != 1)
JFFS2_WARNING("Eep. No valid nodes for ino #%u.\n", f->inocache->ino);
while (valid_ref) {
unsigned char *bufstart;
/* We can hold a pointer to a non-obsolete node without the spinlock,
but _obsolete_ nodes may disappear at any time, if the block
they're in gets erased. So if we mark 'ref' obsolete while we're
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 node has
* size = JFFS2_MIN_NODE_HEADER.
*/
if (jffs2_is_writebuffered(c)) {
/*
* We treat 'buf' as 2 adjacent wbufs. We want to
* adjust bufstart such as it points to the
* beginning of the node within this wbuf.
*/
bufstart = buf + (ref_offset(ref) % c->wbuf_pagesize);
/* We will read either one wbuf or 2 wbufs. */
len = c->wbuf_pagesize - (bufstart - buf);
if (JFFS2_MIN_NODE_HEADER + (int)(bufstart - buf) > c->wbuf_pagesize) {
/* The header spans the border of the first wbuf */
len += c->wbuf_pagesize;
}
} else {
bufstart = buf;
len = JFFS2_MIN_NODE_HEADER;
}
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, bufstart);
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: %d instead of %d.\n", ref_offset(ref), retlen, len);
err = -EIO;
goto free_out;
}
node = (union jffs2_node_union *)bufstart;
switch (je16_to_cpu(node->u.nodetype)) {
case JFFS2_NODETYPE_DIRENT:
if (JFFS2_MIN_NODE_HEADER < sizeof(struct jffs2_raw_dirent)) {
err = read_more(c, ref, sizeof(struct jffs2_raw_dirent), &len, buf, bufstart);
if (unlikely(err))
goto free_out;
}
err = read_direntry(c, ref, &node->d, retlen, &ret_fd, latest_mctime, mctime_ver);
if (err == 1) {
jffs2_mark_node_obsolete(c, ref);
break;
} else if (unlikely(err))
goto free_out;
if (je32_to_cpu(node->d.version) > *highest_version)
*highest_version = je32_to_cpu(node->d.version);
break;
case JFFS2_NODETYPE_INODE:
if (JFFS2_MIN_NODE_HEADER < sizeof(struct jffs2_raw_inode)) {
err = read_more(c, ref, sizeof(struct jffs2_raw_inode), &len, buf, bufstart);
if (unlikely(err))
goto free_out;
}
err = read_dnode(c, ref, &node->i, &ret_tn, len, latest_mctime, mctime_ver);
if (err == 1) {
jffs2_mark_node_obsolete(c, ref);
break;
} else if (unlikely(err))
goto free_out;
if (je32_to_cpu(node->i.version) > *highest_version)
*highest_version = je32_to_cpu(node->i.version);
break;
default:
if (JFFS2_MIN_NODE_HEADER < sizeof(struct jffs2_unknown_node)) {
err = read_more(c, ref, sizeof(struct jffs2_unknown_node), &len, buf, bufstart);
if (unlikely(err))
goto free_out;
}
err = read_unknown(c, ref, &node->u);
if (err == 1) {
jffs2_mark_node_obsolete(c, ref);
break;
} else if (unlikely(err))
goto free_out;
}
spin_lock(&c->erase_completion_lock);
}
spin_unlock(&c->erase_completion_lock);
*tnp = ret_tn;
*fdp = ret_fd;
kfree(buf);
dbg_readinode("nodes of inode #%u were read, the highest version is %u, latest_mctime %u, mctime_ver %u.\n",
f->inocache->ino, *highest_version, *latest_mctime, *mctime_ver);
return 0;
free_out:
jffs2_free_tmp_dnode_info_list(&ret_tn);
jffs2_free_full_dirent_list(ret_fd);
kfree(buf);
return err;
}
/*
* 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, struct rb_root *tnp, int rdlen,
uint32_t *latest_mctime, uint32_t *mctime_ver)
{
struct jffs2_tmp_dnode_info *tn;
uint32_t len, csize;
int ret = 1;
/* Obsoleted. This cannot happen, surely? dwmw2 20020308 */
BUG_ON(ref_obsolete(ref));
tn = jffs2_alloc_tmp_dnode_info();
if (!tn) {
JFFS2_ERROR("failed to allocate tn (%d bytes).\n", sizeof(*tn));
return -ENOMEM;
}
tn->partial_crc = 0;
csize = je32_to_cpu(rd->csize);
/* If we've never checked the CRCs on this node, check them now */
if (ref_flags(ref) == REF_UNCHECKED) {
uint32_t crc;
crc = crc32(0, rd, sizeof(*rd) - 8);
if (unlikely(crc != je32_to_cpu(rd->node_crc))) {
JFFS2_NOTICE("header CRC failed on node at %#08x: read %#08x, calculated %#08x\n",
ref_offset(ref), je32_to_cpu(rd->node_crc), crc);
goto free_out;
}
/* 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));
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 whith
* !jffs2_can_mark_obsolete()), since on NOR flashes
* nodes are marked obsolete physically.
*
* Since NAND flashes (or other flashes with
* jffs2_is_writebuffered(c)) are anyway read by
* fractions of c->wbuf_pagesize, and we have just read
* the node header, it is likely that the starting part
* of the node data is also read when we read the
* header. So we don't mind to check the CRC of the
* starting part of the data of the node now, and check
* the second part later (in jffs2_check_node_data()).
* Of course, we will not need to re-read and re-check
* the NAND page which we have just read. This is why we
* read the whole NAND page at jffs2_get_inode_nodes(),
* while we needed only the node header.
*/
unsigned char *buf;
/* 'buf' will point to the start of data */
buf = (unsigned char *)rd + sizeof(*rd);
/* len will be the read data length */
len = min_t(uint32_t, rdlen - sizeof(*rd), csize);
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));
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;
/* 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_readinode("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);
jffs2_add_tn_to_tree(tn, tnp);
return 0;
free_out:
jffs2_free_tmp_dnode_info(tn);
return ret;
}
/* 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;
}
/*
* 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. */
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);
mtd_unpoint(c->mtd, ofs, retlen);
} else if (err) {
if (err != -EOPNOTSUPP)
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
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
mtd_unpoint(c->mtd, ofs, len);
#endif
return err;
}