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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>
This commit is contained in:
Grant Erickson 2011-04-08 08:51:34 -07:00 committed by David Woodhouse
parent 3e45cf5e85
commit 1ddd0d9a31
1 changed files with 11 additions and 8 deletions
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19
fs/jffs2/scan.c
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@ -94,7 +94,7 @@ int jffs2_scan_medium(struct jffs2_sb_info *c)
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 @@ int jffs2_scan_medium(struct jffs2_sb_info *c)
/* 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()) {