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dio: use get_user_pages_fast

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Use get_user_pages_fast in the common/generic block and fs direct IO paths.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Dave Kleikamp <shaggy@austin.ibm.com>
Cc: Andy Whitcroft <apw@shadowen.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Dave Kleikamp <shaggy@austin.ibm.com>
Cc: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Zach Brown <zach.brown@oracle.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Reviewed-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nick Piggin 2008-07-25 19:45:25 -07:00 committed by Linus Torvalds
parent 8174c430e4
commit f5dd33c494
2 changed files with 4 additions and 14 deletions
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8
fs/bio.c
View file

@ -721,12 +721,8 @@ static struct bio *__bio_map_user_iov(struct request_queue *q,
const int local_nr_pages = end - start;
const int page_limit = cur_page + local_nr_pages;
down_read(&current->mm->mmap_sem);
ret = get_user_pages(current, current->mm, uaddr,
local_nr_pages,
write_to_vm, 0, &pages[cur_page], NULL);
up_read(&current->mm->mmap_sem);
ret = get_user_pages_fast(uaddr, local_nr_pages,
write_to_vm, &pages[cur_page]);
if (ret < local_nr_pages) {
ret = -EFAULT;
goto out_unmap;

10
fs/direct-io.c
View file

@ -150,17 +150,11 @@ static int dio_refill_pages(struct dio *dio)
int nr_pages;
nr_pages = min(dio->total_pages - dio->curr_page, DIO_PAGES);
down_read(&current->mm->mmap_sem);
ret = get_user_pages(
current, /* Task for fault acounting */
current->mm, /* whose pages? */
ret = get_user_pages_fast(
dio->curr_user_address, /* Where from? */
nr_pages, /* How many pages? */
dio->rw == READ, /* Write to memory? */
0, /* force (?) */
&dio->pages[0],
NULL); /* vmas */
up_read(&current->mm->mmap_sem);
&dio->pages[0]); /* Put results here */
if (ret < 0 && dio->blocks_available && (dio->rw & WRITE)) {
struct page *page = ZERO_PAGE(0);