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Limit max_pages for insane devices 

Intel SSDs have a limit of 0xffff as queue_max_hw_sectors(q).  Such a
limit may make sense from a hardware pov, but it causes bio_alloc() to
return NULL.

Signed-off-by: Joern Engel <joern@logfs.org>
This commit is contained in:
Joern Engel 2010-03-17 13:47:45 +01:00
parent 49137f2efb
commit 59fe27c0a8
1 changed files with 6 additions and 2 deletions
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8
fs/logfs/dev_bdev.c
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@ -97,8 +97,10 @@ static int __bdev_writeseg(struct super_block *sb, u64 ofs, pgoff_t index,
unsigned int max_pages = queue_max_hw_sectors(q) >> (PAGE_SHIFT - 9);
int i;
if (max_pages > BIO_MAX_PAGES)
max_pages = BIO_MAX_PAGES;
bio = bio_alloc(GFP_NOFS, max_pages);
BUG_ON(!bio); /* FIXME: handle this */
BUG_ON(!bio);
for (i = 0; i < nr_pages; i++) {
if (i >= max_pages) {
@ -191,8 +193,10 @@ static int do_erase(struct super_block *sb, u64 ofs, pgoff_t index,
unsigned int max_pages = queue_max_hw_sectors(q) >> (PAGE_SHIFT - 9);
int i;
if (max_pages > BIO_MAX_PAGES)
max_pages = BIO_MAX_PAGES;
bio = bio_alloc(GFP_NOFS, max_pages);
BUG_ON(!bio); /* FIXME: handle this */
BUG_ON(!bio);
for (i = 0; i < nr_pages; i++) {
if (i >= max_pages) {