JFFS2: retry large buffer allocations
Replace direct call to kmalloc for a potentially large, contiguous
buffer allocation with one to mtd_kmalloc_up_to which helps ensure the
operation can succeed under low-memory, highly- fragmented situations
albeit somewhat more slowly.
Signed-off-by: Grant Erickson <marathon96@gmail.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/fs/jffs2/scan.c b/fs/jffs2/scan.c
index b632ddd..8d8cd34 100644
--- a/fs/jffs2/scan.c
+++ b/fs/jffs2/scan.c
@@ -94,7 +94,7 @@
uint32_t buf_size = 0;
struct jffs2_summary *s = NULL; /* summary info collected by the scan process */
#ifndef __ECOS
- size_t pointlen;
+ size_t pointlen, try_size;
if (c->mtd->point) {
ret = c->mtd->point(c->mtd, 0, c->mtd->size, &pointlen,
@@ -113,18 +113,21 @@
/* For NAND it's quicker to read a whole eraseblock at a time,
apparently */
if (jffs2_cleanmarker_oob(c))
- buf_size = c->sector_size;
+ try_size = c->sector_size;
else
- buf_size = PAGE_SIZE;
+ try_size = PAGE_SIZE;
- /* Respect kmalloc limitations */
- if (buf_size > 128*1024)
- buf_size = 128*1024;
+ D1(printk(KERN_DEBUG "Trying to allocate readbuf of %zu "
+ "bytes\n", try_size));
- D1(printk(KERN_DEBUG "Allocating readbuf of %d bytes\n", buf_size));
- flashbuf = kmalloc(buf_size, GFP_KERNEL);
+ flashbuf = mtd_kmalloc_up_to(c->mtd, &try_size);
if (!flashbuf)
return -ENOMEM;
+
+ D1(printk(KERN_DEBUG "Allocated readbuf of %zu bytes\n",
+ try_size));
+
+ buf_size = (uint32_t)try_size;
}
if (jffs2_sum_active()) {