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UBIFS: allocate lpt dump buffer on demand 

Instead of using pre-allocated 'c->dbg->buf' buffer in
'dump_lpt_leb()', dynamically allocate it when needed. The intend
is to get rid of the pre-allocated 'c->dbg->buf' buffer and save
128KiB of RAM (or more if PEB size is larger). Indeed, currently we
allocate this memory even if the user never enables any self-check,
which is wasteful.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
This commit is contained in:
Artem Bityutskiy 2011-03-11 16:58:39 +02:00
parent 6fb324a4b0
commit cab95d446c
1 changed files with 18 additions and 9 deletions
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27
fs/ubifs/lpt_commit.c
View File

@ -1881,25 +1881,31 @@ int dbg_chk_lpt_sz(struct ubifs_info *c, int action, int len)
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;
void *buf, *p;
printk(KERN_DEBUG "(pid %d) start dumping LEB %d\n",
current->pid, lnum);
buf = p = __vmalloc(c->leb_size, GFP_KERNEL | GFP_NOFS, PAGE_KERNEL);
if (!buf) {
ubifs_err("cannot allocate memory to dump LPT");
return;
}
err = ubi_read(c->ubi, lnum, buf, 0, c->leb_size);
if (err) {
ubifs_err("cannot read LEB %d, error %d", lnum, err);
return;
goto out;
}
while (1) {
offs = c->leb_size - len;
if (!is_a_node(c, buf, len)) {
if (!is_a_node(c, p, len)) {
int pad_len;
pad_len = get_pad_len(c, buf, len);
pad_len = get_pad_len(c, p, len);
if (pad_len) {
printk(KERN_DEBUG "LEB %d:%d, pad %d bytes\n",
lnum, offs, pad_len);
buf += pad_len;
p += pad_len;
len -= pad_len;
continue;
}
@ -1909,7 +1915,7 @@ static void dump_lpt_leb(const struct ubifs_info *c, int lnum)
break;
}
node_type = get_lpt_node_type(c, buf, &node_num);
node_type = get_lpt_node_type(c, p, &node_num);
switch (node_type) {
case UBIFS_LPT_PNODE:
{
@ -1934,7 +1940,7 @@ static void dump_lpt_leb(const struct ubifs_info *c, int lnum)
else
printk(KERN_DEBUG "LEB %d:%d, nnode, ",
lnum, offs);
err = ubifs_unpack_nnode(c, buf, &nnode);
err = ubifs_unpack_nnode(c, p, &nnode);
for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
printk(KERN_CONT "%d:%d", nnode.nbranch[i].lnum,
nnode.nbranch[i].offs);
@ -1955,15 +1961,18 @@ static void dump_lpt_leb(const struct ubifs_info *c, int lnum)
break;
default:
ubifs_err("LPT node type %d not recognized", node_type);
return;
goto out;
}
buf += node_len;
p += node_len;
len -= node_len;
}
printk(KERN_DEBUG "(pid %d) finish dumping LEB %d\n",
current->pid, lnum);
out:
vfree(buf);
return;
}
/**