*
* For licensing information, see the file 'LICENCE' in this directory.
*
- * $Id: readinode.c,v 1.134 2005/07/31 08:20:44 dedekind Exp $
+ * $Id: readinode.c,v 1.143 2005/11/07 11:14:41 gleixner Exp $
*
*/
#include <linux/compiler.h>
#include "nodelist.h"
-/*
- * Put a new tmp_dnode_info into the temporaty RB-tree, keeping the list in
+/*
+ * Put a new tmp_dnode_info into the temporaty RB-tree, keeping the list in
* order of increasing version.
*/
static void jffs2_add_tn_to_tree(struct jffs2_tmp_dnode_info *tn, struct rb_root *list)
/* 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)
+ 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);
while (ref && ref->next_in_ino) {
if (!ref_obsolete(ref))
return ref;
- JFFS2_DBG_NODEREF("node at 0x%08x is obsoleted. Ignoring.\n", ref_offset(ref));
+ dbg_noderef("node at 0x%08x is obsoleted. Ignoring.\n", ref_offset(ref));
ref = ref->next_in_ino;
}
return NULL;
* 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)
+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_full_dirent **fdp,
+ uint32_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)))) {
JFFS2_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;
fd->type = rd->type;
/* Pick out the mctime of the latest dirent */
- if(fd->version > *mctime_ver) {
+ if(fd->version > *mctime_ver && je32_to_cpu(rd->mctime)) {
*mctime_ver = fd->version;
*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,
+
+ 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
+ * the name in it and everything. Link it into the list
*/
jffs2_add_fd_to_list(c, fd, fdp);
* 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)
+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_eraseblock *jeb;
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 (%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) {
- uint32_t crc, len;
+ 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);
- return 1;
+ 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));
- return 1;
+ goto free_out;
}
- 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)) {
- JFFS2_ERROR("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)){
- JFFS2_ERROR("MTD point failed %d\n", err);
- } else
- pointed = 1; /* succefully pointed to device */
- }
-#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;
- }
- }
- 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)) {
- JFFS2_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;
+ 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;
}
-
- }
-
- /* 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.
-
- 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)))) {
- JFFS2_DBG_READINODE("marking node at %#08x REF_PRISTINE\n", ref_offset(ref));
- ref->flash_offset = ref_offset(ref) | REF_PRISTINE;
- } else {
- JFFS2_DBG_READINODE("marking node at %#08x REF_NORMAL\n", ref_offset(ref));
+ } 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);
}
- spin_unlock(&c->erase_completion_lock);
- }
-
- tn = jffs2_alloc_tmp_dnode_info();
- if (!tn) {
- JFFS2_ERROR("alloc tn failed\n");
- return -ENOMEM;
}
tn->fn = jffs2_alloc_full_dnode();
if (!tn->fn) {
JFFS2_ERROR("alloc fn failed\n");
- jffs2_free_tmp_dnode_info(tn);
- return -ENOMEM;
+ 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) && je32_to_cpu(rd->csize))
- tn->fn->size = je32_to_cpu(rd->csize);
+ 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);
- JFFS2_DBG_READINODE("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));
-
+ 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;
}
/*
* 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)
+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 */
BUG_ON(ref_flags(ref) == REF_UNCHECKED);
-
+
un->nodetype = cpu_to_je16(JFFS2_NODE_ACCURATE | je16_to_cpu(un->nodetype));
if (crc32(0, un, sizeof(struct jffs2_unknown_node) - 4) != je32_to_cpu(un->hdr_crc)) {
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: %zu instead of %d.\n",
+ offs, retlen, len);
+ return -EIO;
+ }
+
+ *rdlen = right_len;
+
+ return 0;
+}
+
/* Get tmp_dnode_info and full_dirent for all non-obsolete nodes associated
with this ino, returning the former in order of version */
-
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,
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;
+ unsigned char *buf = NULL;
+ union jffs2_node_union *node;
size_t retlen;
- int err;
+ int len, err;
*mctime_ver = 0;
-
- JFFS2_DBG_READINODE("ino #%u\n", f->inocache->ino);
-
- spin_lock(&c->erase_completion_lock);
- valid_ref = jffs2_first_valid_node(f->inocache->nodes);
+ 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);
+ }
- if (!valid_ref && (f->inocache->ino != 1))
- JFFS2_WARNING("no valid nodes for ino #%u\n", f->inocache->ino);
+ /* 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
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)),
- min_t(uint32_t, ref_totlen(c, NULL, ref), sizeof(node)),
- &retlen, (void *)&node);
+ err = jffs2_flash_read(c, ref_offset(ref), len,
+ &retlen, bufstart);
if (err) {
- JFFS2_ERROR("error %d reading node at 0x%08x in get_inode_nodes()\n", err, ref_offset(ref));
+ JFFS2_ERROR("can not read %d bytes from 0x%08x, " "error code: %d.\n", len, 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;
}
-
- switch (je16_to_cpu(node.u.nodetype)) {
-
+
+ node = (union jffs2_node_union *)bufstart;
+
+ switch (je16_to_cpu(node->u.nodetype)) {
+
case JFFS2_NODETYPE_DIRENT:
- JFFS2_DBG_READINODE("node at %08x (%d) is a dirent node\n", ref_offset(ref), ref_flags(ref));
-
- if (retlen < sizeof(node.d)) {
- JFFS2_ERROR("short read dirent at %#08x\n", ref_offset(ref));
- err = -EIO;
- goto free_out;
+
+ 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);
+ 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);
+
+ if (je32_to_cpu(node->d.version) > *highest_version)
+ *highest_version = je32_to_cpu(node->d.version);
break;
case JFFS2_NODETYPE_INODE:
- JFFS2_DBG_READINODE("node at %08x (%d) is a data node\n", ref_offset(ref), ref_flags(ref));
-
- if (retlen < sizeof(node.i)) {
- JFFS2_ERROR("short read dnode at %#08x\n", ref_offset(ref));
- err = -EIO;
- goto free_out;
+
+ 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, retlen, &ret_tn, latest_mctime, mctime_ver);
+ 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);
-
- JFFS2_DBG_READINODE("version %d, highest_version now %d\n",
- je32_to_cpu(node.i.version), *highest_version);
+ if (je32_to_cpu(node->i.version) > *highest_version)
+ *highest_version = je32_to_cpu(node->i.version);
break;
default:
- /* Check we've managed to read at least the common node header */
- if (retlen < sizeof(struct jffs2_unknown_node)) {
- JFFS2_ERROR("short read unknown node at %#08x\n", ref_offset(ref));
- return -EIO;
+ 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, retlen);
+ err = read_unknown(c, ref, &node->u);
if (err == 1) {
jffs2_mark_node_obsolete(c, ref);
break;
}
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;
}
-static int jffs2_do_read_inode_internal(struct jffs2_sb_info *c,
+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 = NULL;
+ 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 = NULL;
+ struct jffs2_full_dnode *fn, *first_fn = NULL;
uint32_t crc;
uint32_t latest_mctime, mctime_ver;
- uint32_t mdata_ver = 0;
size_t retlen;
int ret;
- JFFS2_DBG_READINODE("ino #%u nlink is %d\n", f->inocache->ino, f->inocache->nlink);
+ 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);
rb = rb_first(&tn_list);
while (rb) {
+ cond_resched();
tn = rb_entry(rb, struct jffs2_tmp_dnode_info, rb);
fn = tn->fn;
-
- if (f->metadata) {
- if (likely(tn->version >= mdata_ver)) {
- JFFS2_DBG_READINODE("obsoleting old metadata at 0x%08x\n", ref_offset(f->metadata->raw));
- jffs2_mark_node_obsolete(c, f->metadata->raw);
- jffs2_free_full_dnode(f->metadata);
- f->metadata = NULL;
-
- mdata_ver = 0;
- } else {
- /* This should never happen. */
- JFFS2_ERROR("Er. New metadata at 0x%08x with ver %d is actually older than previous ver %d at 0x%08x\n",
- ref_offset(fn->raw), tn->version, mdata_ver, ref_offset(f->metadata->raw));
- jffs2_mark_node_obsolete(c, fn->raw);
- jffs2_free_full_dnode(fn);
- /* Fill in latest_node from the metadata, not this one we're about to free... */
- fn = f->metadata;
- goto next_tn;
- }
- }
+ 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) {
- jffs2_add_full_dnode_to_inode(c, f, fn);
- } else {
- /* Zero-sized node at end of version list. Just a metadata update */
- JFFS2_DBG_READINODE("metadata @%08x: ver %d\n", ref_offset(fn->raw), tn->version);
+ 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;
- mdata_ver = tn->version;
- }
- next_tn:
+ 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. */
+ * 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;
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. */
+ * 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;
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);
- if (!fn) {
+ 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);
}
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));
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;
}
f->target[je32_to_cpu(latest_node->csize)] = '\0';
- JFFS2_DBG_READINODE("symlink's target '%s' cached\n", f->target);
+ dbg_readinode("symlink's target '%s' cached\n", f->target);
}
-
+
/* fall through... */
case S_IFBLK:
}
/* 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,
+int jffs2_do_read_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
uint32_t ino, struct jffs2_raw_inode *latest_node)
{
- JFFS2_DBG_READINODE("read inode #%u\n", ino);
+ dbg_readinode("read inode #%u\n", ino);
retry_inocache:
spin_lock(&c->inocache_lock);
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. */
- JFFS2_DBG_READINODE("waiting for ino #%u in state %d\n", ino, f->inocache->state);
+ 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;
JFFS2_ERROR("cannot allocate inocache for root inode\n");
return -ENOMEM;
}
- JFFS2_DBG_READINODE("creating inocache for root inode\n");
+ dbg_readinode("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;
kfree(f->target);
f->target = NULL;
}
-
+
fds = f->dents;
while(fds) {
fd = fds;
projects / linux-2.6-omap-h63xx.git / blobdiff