return 0;
}
}
- dbg_err("last LEB %d", *lnum);
- dump_stack();
return -ENOSPC;
}
int lnum, offs, len, alen, done_lsave, done_ltab, err;
struct ubifs_cnode *cnode;
+ err = dbg_chk_lpt_sz(c, 0, 0);
+ if (err)
+ return err;
cnode = c->lpt_cnext;
if (!cnode)
return 0;
c->lsave_lnum = lnum;
c->lsave_offs = offs;
offs += c->lsave_sz;
+ dbg_chk_lpt_sz(c, 1, c->lsave_sz);
}
if (offs + c->ltab_sz <= c->leb_size) {
c->ltab_lnum = lnum;
c->ltab_offs = offs;
offs += c->ltab_sz;
+ dbg_chk_lpt_sz(c, 1, c->ltab_sz);
}
do {
while (offs + len > c->leb_size) {
alen = ALIGN(offs, c->min_io_size);
upd_ltab(c, lnum, c->leb_size - alen, alen - offs);
+ dbg_chk_lpt_sz(c, 2, alen - offs);
err = alloc_lpt_leb(c, &lnum);
if (err)
- return err;
+ goto no_space;
offs = 0;
ubifs_assert(lnum >= c->lpt_first &&
lnum <= c->lpt_last);
c->lsave_lnum = lnum;
c->lsave_offs = offs;
offs += c->lsave_sz;
+ dbg_chk_lpt_sz(c, 1, c->lsave_sz);
continue;
}
if (!done_ltab) {
c->ltab_lnum = lnum;
c->ltab_offs = offs;
offs += c->ltab_sz;
+ dbg_chk_lpt_sz(c, 1, c->ltab_sz);
continue;
}
break;
c->lpt_offs = offs;
}
offs += len;
+ dbg_chk_lpt_sz(c, 1, len);
cnode = cnode->cnext;
} while (cnode && cnode != c->lpt_cnext);
if (offs + c->lsave_sz > c->leb_size) {
alen = ALIGN(offs, c->min_io_size);
upd_ltab(c, lnum, c->leb_size - alen, alen - offs);
+ dbg_chk_lpt_sz(c, 2, alen - offs);
err = alloc_lpt_leb(c, &lnum);
if (err)
- return err;
+ goto no_space;
offs = 0;
ubifs_assert(lnum >= c->lpt_first &&
lnum <= c->lpt_last);
c->lsave_lnum = lnum;
c->lsave_offs = offs;
offs += c->lsave_sz;
+ dbg_chk_lpt_sz(c, 1, c->lsave_sz);
}
/* Make sure to place LPT's own lprops table */
if (offs + c->ltab_sz > c->leb_size) {
alen = ALIGN(offs, c->min_io_size);
upd_ltab(c, lnum, c->leb_size - alen, alen - offs);
+ dbg_chk_lpt_sz(c, 2, alen - offs);
err = alloc_lpt_leb(c, &lnum);
if (err)
- return err;
+ goto no_space;
offs = 0;
ubifs_assert(lnum >= c->lpt_first &&
lnum <= c->lpt_last);
c->ltab_lnum = lnum;
c->ltab_offs = offs;
offs += c->ltab_sz;
+ dbg_chk_lpt_sz(c, 1, c->ltab_sz);
}
alen = ALIGN(offs, c->min_io_size);
upd_ltab(c, lnum, c->leb_size - alen, alen - offs);
+ dbg_chk_lpt_sz(c, 4, alen - offs);
+ err = dbg_chk_lpt_sz(c, 3, alen);
+ if (err)
+ return err;
return 0;
+
+no_space:
+ ubifs_err("LPT out of space");
+ dbg_err("LPT out of space at LEB %d:%d needing %d, done_ltab %d, "
+ "done_lsave %d", lnum, offs, len, done_ltab, done_lsave);
+ dbg_dump_lpt_info(c);
+ dbg_dump_lpt_lebs(c);
+ dump_stack();
+ return err;
}
/**
*lnum = i + c->lpt_first;
return 0;
}
- dbg_err("last LEB %d", *lnum);
- dump_stack();
return -ENOSPC;
}
done_lsave = 1;
ubifs_pack_lsave(c, buf + offs, c->lsave);
offs += c->lsave_sz;
+ dbg_chk_lpt_sz(c, 1, c->lsave_sz);
}
if (offs + c->ltab_sz <= c->leb_size) {
done_ltab = 1;
ubifs_pack_ltab(c, buf + offs, c->ltab_cmt);
offs += c->ltab_sz;
+ dbg_chk_lpt_sz(c, 1, c->ltab_sz);
}
/* Loop for each cnode */
alen, UBI_SHORTTERM);
if (err)
return err;
+ dbg_chk_lpt_sz(c, 4, alen - wlen);
}
+ dbg_chk_lpt_sz(c, 2, 0);
err = realloc_lpt_leb(c, &lnum);
if (err)
- return err;
+ goto no_space;
offs = 0;
from = 0;
ubifs_assert(lnum >= c->lpt_first &&
done_lsave = 1;
ubifs_pack_lsave(c, buf + offs, c->lsave);
offs += c->lsave_sz;
+ dbg_chk_lpt_sz(c, 1, c->lsave_sz);
continue;
}
if (!done_ltab) {
done_ltab = 1;
ubifs_pack_ltab(c, buf + offs, c->ltab_cmt);
offs += c->ltab_sz;
+ dbg_chk_lpt_sz(c, 1, c->ltab_sz);
continue;
}
break;
clear_bit(COW_ZNODE, &cnode->flags);
smp_mb__after_clear_bit();
offs += len;
+ dbg_chk_lpt_sz(c, 1, len);
cnode = cnode->cnext;
} while (cnode && cnode != c->lpt_cnext);
UBI_SHORTTERM);
if (err)
return err;
+ dbg_chk_lpt_sz(c, 2, alen - wlen);
err = realloc_lpt_leb(c, &lnum);
if (err)
- return err;
+ goto no_space;
offs = 0;
ubifs_assert(lnum >= c->lpt_first &&
lnum <= c->lpt_last);
done_lsave = 1;
ubifs_pack_lsave(c, buf + offs, c->lsave);
offs += c->lsave_sz;
+ dbg_chk_lpt_sz(c, 1, c->lsave_sz);
}
/* Make sure to place LPT's own lprops table */
UBI_SHORTTERM);
if (err)
return err;
+ dbg_chk_lpt_sz(c, 2, alen - wlen);
err = realloc_lpt_leb(c, &lnum);
if (err)
- return err;
+ goto no_space;
offs = 0;
ubifs_assert(lnum >= c->lpt_first &&
lnum <= c->lpt_last);
done_ltab = 1;
ubifs_pack_ltab(c, buf + offs, c->ltab_cmt);
offs += c->ltab_sz;
+ dbg_chk_lpt_sz(c, 1, c->ltab_sz);
}
/* Write remaining data in buffer */
err = ubifs_leb_write(c, lnum, buf + from, from, alen, UBI_SHORTTERM);
if (err)
return err;
+
+ dbg_chk_lpt_sz(c, 4, alen - wlen);
+ err = dbg_chk_lpt_sz(c, 3, ALIGN(offs, c->min_io_size));
+ if (err)
+ return err;
+
c->nhead_lnum = lnum;
c->nhead_offs = ALIGN(offs, c->min_io_size);
dbg_lp("LPT ltab is at %d:%d", c->ltab_lnum, c->ltab_offs);
if (c->big_lpt)
dbg_lp("LPT lsave is at %d:%d", c->lsave_lnum, c->lsave_offs);
+
return 0;
+
+no_space:
+ ubifs_err("LPT out of space mismatch");
+ dbg_err("LPT out of space mismatch at LEB %d:%d needing %d, done_ltab "
+ "%d, done_lsave %d", lnum, offs, len, done_ltab, done_lsave);
+ dbg_dump_lpt_info(c);
+ dbg_dump_lpt_lebs(c);
+ dump_stack();
+ return err;
}
/**
/* We assume here that LEB zero is never an LPT LEB */
if (nnode->nbranch[iip].lnum)
return ubifs_get_pnode(c, nnode, iip);
- else
- return NULL;
}
/* Go up while can't go right */
* @c: UBIFS file-system description object
* @node_type: LPT node type
*/
-static int get_lpt_node_len(struct ubifs_info *c, int node_type)
+static int get_lpt_node_len(const struct ubifs_info *c, int node_type)
{
switch (node_type) {
case UBIFS_LPT_NNODE:
* @buf: buffer
* @len: length of buffer
*/
-static int get_pad_len(struct ubifs_info *c, uint8_t *buf, int len)
+static int get_pad_len(const struct ubifs_info *c, uint8_t *buf, int len)
{
int offs, pad_len;
* @buf: buffer
* @node_num: node number is returned here
*/
-static int get_lpt_node_type(struct ubifs_info *c, uint8_t *buf, int *node_num)
+static int get_lpt_node_type(const struct ubifs_info *c, uint8_t *buf,
+ int *node_num)
{
uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES;
int pos = 0, node_type;
*
* This function returns %1 if the buffer contains a node or %0 if it does not.
*/
-static int is_a_node(struct ubifs_info *c, uint8_t *buf, int len)
+static int is_a_node(const struct ubifs_info *c, uint8_t *buf, int len)
{
uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES;
int pos = 0, node_type, node_len;
uint16_t crc, calc_crc;
+ if (len < UBIFS_LPT_CRC_BYTES + (UBIFS_LPT_TYPE_BITS + 7) / 8)
+ return 0;
node_type = ubifs_unpack_bits(&addr, &pos, UBIFS_LPT_TYPE_BITS);
if (node_type == UBIFS_LPT_NOT_A_NODE)
return 0;
return 1;
}
-
/**
* lpt_gc_lnum - garbage collect a LPT LEB.
* @c: UBIFS file-system description object
dbg_lp("");
mutex_lock(&c->lp_mutex);
+ err = dbg_chk_lpt_free_spc(c);
+ if (err)
+ goto out;
err = dbg_check_ltab(c);
if (err)
goto out;
{
int err, len = c->leb_size, dirty = 0, node_type, node_num, node_len;
int ret;
- void *buf = c->dbg_buf;
+ void *buf = c->dbg->buf;
+
+ if (!(ubifs_chk_flags & UBIFS_CHK_LPROPS))
+ return 0;
dbg_lp("LEB %d", lnum);
err = ubi_read(c->ubi, lnum, buf, 0, c->leb_size);
return 0;
}
+/**
+ * dbg_chk_lpt_free_spc - check LPT free space is enough to write entire LPT.
+ * @c: the UBIFS file-system description object
+ *
+ * This function returns %0 on success and a negative error code on failure.
+ */
+int dbg_chk_lpt_free_spc(struct ubifs_info *c)
+{
+ long long free = 0;
+ int i;
+
+ if (!(ubifs_chk_flags & UBIFS_CHK_LPROPS))
+ return 0;
+
+ for (i = 0; i < c->lpt_lebs; i++) {
+ if (c->ltab[i].tgc || c->ltab[i].cmt)
+ continue;
+ if (i + c->lpt_first == c->nhead_lnum)
+ free += c->leb_size - c->nhead_offs;
+ else if (c->ltab[i].free == c->leb_size)
+ free += c->leb_size;
+ }
+ if (free < c->lpt_sz) {
+ dbg_err("LPT space error: free %lld lpt_sz %lld",
+ free, c->lpt_sz);
+ dbg_dump_lpt_info(c);
+ dbg_dump_lpt_lebs(c);
+ dump_stack();
+ return -EINVAL;
+ }
+ return 0;
+}
+
+/**
+ * dbg_chk_lpt_sz - check LPT does not write more than LPT size.
+ * @c: the UBIFS file-system description object
+ * @action: action
+ * @len: length written
+ *
+ * This function returns %0 on success and a negative error code on failure.
+ */
+int dbg_chk_lpt_sz(struct ubifs_info *c, int action, int len)
+{
+ struct ubifs_debug_info *d = c->dbg;
+ long long chk_lpt_sz, lpt_sz;
+ int err = 0;
+
+ if (!(ubifs_chk_flags & UBIFS_CHK_LPROPS))
+ return 0;
+
+ switch (action) {
+ case 0:
+ d->chk_lpt_sz = 0;
+ d->chk_lpt_sz2 = 0;
+ d->chk_lpt_lebs = 0;
+ d->chk_lpt_wastage = 0;
+ if (c->dirty_pn_cnt > c->pnode_cnt) {
+ dbg_err("dirty pnodes %d exceed max %d",
+ c->dirty_pn_cnt, c->pnode_cnt);
+ err = -EINVAL;
+ }
+ if (c->dirty_nn_cnt > c->nnode_cnt) {
+ dbg_err("dirty nnodes %d exceed max %d",
+ c->dirty_nn_cnt, c->nnode_cnt);
+ err = -EINVAL;
+ }
+ return err;
+ case 1:
+ d->chk_lpt_sz += len;
+ return 0;
+ case 2:
+ d->chk_lpt_sz += len;
+ d->chk_lpt_wastage += len;
+ d->chk_lpt_lebs += 1;
+ return 0;
+ case 3:
+ chk_lpt_sz = c->leb_size;
+ chk_lpt_sz *= d->chk_lpt_lebs;
+ chk_lpt_sz += len - c->nhead_offs;
+ if (d->chk_lpt_sz != chk_lpt_sz) {
+ dbg_err("LPT wrote %lld but space used was %lld",
+ d->chk_lpt_sz, chk_lpt_sz);
+ err = -EINVAL;
+ }
+ if (d->chk_lpt_sz > c->lpt_sz) {
+ dbg_err("LPT wrote %lld but lpt_sz is %lld",
+ d->chk_lpt_sz, c->lpt_sz);
+ err = -EINVAL;
+ }
+ if (d->chk_lpt_sz2 && d->chk_lpt_sz != d->chk_lpt_sz2) {
+ dbg_err("LPT layout size %lld but wrote %lld",
+ d->chk_lpt_sz, d->chk_lpt_sz2);
+ err = -EINVAL;
+ }
+ if (d->chk_lpt_sz2 && d->new_nhead_offs != len) {
+ dbg_err("LPT new nhead offs: expected %d was %d",
+ d->new_nhead_offs, len);
+ err = -EINVAL;
+ }
+ lpt_sz = (long long)c->pnode_cnt * c->pnode_sz;
+ lpt_sz += (long long)c->nnode_cnt * c->nnode_sz;
+ lpt_sz += c->ltab_sz;
+ if (c->big_lpt)
+ lpt_sz += c->lsave_sz;
+ if (d->chk_lpt_sz - d->chk_lpt_wastage > lpt_sz) {
+ dbg_err("LPT chk_lpt_sz %lld + waste %lld exceeds %lld",
+ d->chk_lpt_sz, d->chk_lpt_wastage, lpt_sz);
+ err = -EINVAL;
+ }
+ if (err) {
+ dbg_dump_lpt_info(c);
+ dbg_dump_lpt_lebs(c);
+ dump_stack();
+ }
+ d->chk_lpt_sz2 = d->chk_lpt_sz;
+ d->chk_lpt_sz = 0;
+ d->chk_lpt_wastage = 0;
+ d->chk_lpt_lebs = 0;
+ d->new_nhead_offs = len;
+ return err;
+ case 4:
+ d->chk_lpt_sz += len;
+ d->chk_lpt_wastage += len;
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
+
+/**
+ * dbg_dump_lpt_leb - dump an LPT LEB.
+ * @c: UBIFS file-system description object
+ * @lnum: LEB number to dump
+ *
+ * This function dumps an LEB from LPT area. Nodes in this area are very
+ * different to nodes in the main area (e.g., they do not have common headers,
+ * they do not have 8-byte alignments, etc), so we have a separate function to
+ * dump LPT area LEBs. Note, LPT has to be locked by the coller.
+ */
+static void dump_lpt_leb(const struct ubifs_info *c, int lnum)
+{
+ int err, len = c->leb_size, node_type, node_num, node_len, offs;
+ void *buf = c->dbg->buf;
+
+ printk(KERN_DEBUG "(pid %d) start dumping LEB %d\n",
+ current->pid, lnum);
+ err = ubi_read(c->ubi, lnum, buf, 0, c->leb_size);
+ if (err) {
+ ubifs_err("cannot read LEB %d, error %d", lnum, err);
+ return;
+ }
+ while (1) {
+ offs = c->leb_size - len;
+ if (!is_a_node(c, buf, len)) {
+ int pad_len;
+
+ pad_len = get_pad_len(c, buf, len);
+ if (pad_len) {
+ printk(KERN_DEBUG "LEB %d:%d, pad %d bytes\n",
+ lnum, offs, pad_len);
+ buf += pad_len;
+ len -= pad_len;
+ continue;
+ }
+ if (len)
+ printk(KERN_DEBUG "LEB %d:%d, free %d bytes\n",
+ lnum, offs, len);
+ break;
+ }
+
+ node_type = get_lpt_node_type(c, buf, &node_num);
+ switch (node_type) {
+ case UBIFS_LPT_PNODE:
+ {
+ node_len = c->pnode_sz;
+ if (c->big_lpt)
+ printk(KERN_DEBUG "LEB %d:%d, pnode num %d\n",
+ lnum, offs, node_num);
+ else
+ printk(KERN_DEBUG "LEB %d:%d, pnode\n",
+ lnum, offs);
+ break;
+ }
+ case UBIFS_LPT_NNODE:
+ {
+ int i;
+ struct ubifs_nnode nnode;
+
+ node_len = c->nnode_sz;
+ if (c->big_lpt)
+ printk(KERN_DEBUG "LEB %d:%d, nnode num %d, ",
+ lnum, offs, node_num);
+ else
+ printk(KERN_DEBUG "LEB %d:%d, nnode, ",
+ lnum, offs);
+ err = ubifs_unpack_nnode(c, buf, &nnode);
+ for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
+ printk("%d:%d", nnode.nbranch[i].lnum,
+ nnode.nbranch[i].offs);
+ if (i != UBIFS_LPT_FANOUT - 1)
+ printk(", ");
+ }
+ printk("\n");
+ break;
+ }
+ case UBIFS_LPT_LTAB:
+ node_len = c->ltab_sz;
+ printk(KERN_DEBUG "LEB %d:%d, ltab\n",
+ lnum, offs);
+ break;
+ case UBIFS_LPT_LSAVE:
+ node_len = c->lsave_sz;
+ printk(KERN_DEBUG "LEB %d:%d, lsave len\n", lnum, offs);
+ break;
+ default:
+ ubifs_err("LPT node type %d not recognized", node_type);
+ return;
+ }
+
+ buf += node_len;
+ len -= node_len;
+ }
+
+ printk(KERN_DEBUG "(pid %d) finish dumping LEB %d\n",
+ current->pid, lnum);
+}
+
+/**
+ * dbg_dump_lpt_lebs - dump LPT lebs.
+ * @c: UBIFS file-system description object
+ *
+ * This function dumps all LPT LEBs. The caller has to make sure the LPT is
+ * locked.
+ */
+void dbg_dump_lpt_lebs(const struct ubifs_info *c)
+{
+ int i;
+
+ printk(KERN_DEBUG "(pid %d) start dumping all LPT LEBs\n",
+ current->pid);
+ for (i = 0; i < c->lpt_lebs; i++)
+ dump_lpt_leb(c, i + c->lpt_first);
+ printk(KERN_DEBUG "(pid %d) finish dumping all LPT LEBs\n",
+ current->pid);
+}
+
#endif /* CONFIG_UBIFS_FS_DEBUG */