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UBIFS: allocate orphans scan buffer on demand 

Instead of using pre-allocated 'c->dbg->buf' buffer in
'dbg_scan_orphans()', 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 17:11:25 +02:00
parent cab95d446c
commit f5cf319cf3
1 changed files with 9 additions and 1 deletions
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10
fs/ubifs/orphan.c
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@ -892,15 +892,22 @@ static int dbg_read_orphans(struct check_info *ci, struct ubifs_scan_leb *sleb)
static int dbg_scan_orphans(struct ubifs_info *c, struct check_info *ci)
{
int lnum, err = 0;
void *buf;
/* Check no-orphans flag and skip this if no orphans */
if (c->no_orphs)
return 0;
buf = __vmalloc(c->leb_size, GFP_KERNEL | GFP_NOFS, PAGE_KERNEL);
if (!buf) {
ubifs_err("cannot allocate memory to check orphans");
return 0;
}
for (lnum = c->orph_first; lnum <= c->orph_last; lnum++) {
struct ubifs_scan_leb *sleb;
sleb = ubifs_scan(c, lnum, 0, c->dbg->buf, 0);
sleb = ubifs_scan(c, lnum, 0, buf, 0);
if (IS_ERR(sleb)) {
err = PTR_ERR(sleb);
break;
@ -912,6 +919,7 @@ static int dbg_scan_orphans(struct ubifs_info *c, struct check_info *ci)
break;
}
vfree(buf);
return err;
}