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authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2011-03-11 15:58:39 +0100
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2011-03-16 13:05:25 +0100
commitcab95d446cb766062fa7e2e7e326035d7c65b803 (patch)
tree5024518810d8d2b3d4e3ff43d003142a42184552 /fs
parentUBIFS: allocate ltab checking buffer on demand (diff)
downloadlinux-cab95d446cb766062fa7e2e7e326035d7c65b803.tar.xz
linux-cab95d446cb766062fa7e2e7e326035d7c65b803.zip
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/ubifs/lpt_commit.c27
1 files changed, 18 insertions, 9 deletions
diff --git a/fs/ubifs/lpt_commit.c b/fs/ubifs/lpt_commit.c
index 62a38d9c55e9..0a3c2c3f5c4a 100644
--- a/fs/ubifs/lpt_commit.c
+++ b/fs/ubifs/lpt_commit.c
@@ -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;
}
/**