aboutsummaryrefslogtreecommitdiff
path: root/fs/ntfs/aops.c
diff options
context:
space:
mode:
authorAnton Altaparmakov <aia21@cantab.net>2005-09-08 21:43:47 +0100
committerAnton Altaparmakov <aia21@cantab.net>2005-09-08 21:43:47 +0100
commit54b02eb01c0172294e43e2b54d6815f65637c111 (patch)
tree0dec3c7f9553f96e3edeab769077723d1ab922e1 /fs/ntfs/aops.c
parentbd45fdd209ca49c5010ac9af469c41ae6dd3f145 (diff)
downloadlinux-linaro-54b02eb01c0172294e43e2b54d6815f65637c111.tar.gz
NTFS: Optimize fs/ntfs/aops.c::ntfs_write_block() by extending the page
lock protection over the buffer submission for i/o which allows the removal of the get_bh()/put_bh() pairs for each buffer. Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
Diffstat (limited to 'fs/ntfs/aops.c')
-rw-r--r--fs/ntfs/aops.c13
1 files changed, 3 insertions, 10 deletions
diff --git a/fs/ntfs/aops.c b/fs/ntfs/aops.c
index 6f2954aac5a..821dad7d14c 100644
--- a/fs/ntfs/aops.c
+++ b/fs/ntfs/aops.c
@@ -735,7 +735,7 @@ lock_retry_remap:
/* For the error case, need to reset bh to the beginning. */
bh = head;
- /* Just an optimization, so ->readpage() isn't called later. */
+ /* Just an optimization, so ->readpage() is not called later. */
if (unlikely(!PageUptodate(page))) {
int uptodate = 1;
do {
@@ -751,7 +751,6 @@ lock_retry_remap:
/* Setup all mapped, dirty buffers for async write i/o. */
do {
- get_bh(bh);
if (buffer_mapped(bh) && buffer_dirty(bh)) {
lock_buffer(bh);
if (test_clear_buffer_dirty(bh)) {
@@ -789,14 +788,8 @@ lock_retry_remap:
BUG_ON(PageWriteback(page));
set_page_writeback(page); /* Keeps try_to_free_buffers() away. */
- unlock_page(page);
- /*
- * Submit the prepared buffers for i/o. Note the page is unlocked,
- * and the async write i/o completion handler can end_page_writeback()
- * at any time after the *first* submit_bh(). So the buffers can then
- * disappear...
- */
+ /* Submit the prepared buffers for i/o. */
need_end_writeback = TRUE;
do {
struct buffer_head *next = bh->b_this_page;
@@ -804,9 +797,9 @@ lock_retry_remap:
submit_bh(WRITE, bh);
need_end_writeback = FALSE;
}
- put_bh(bh);
bh = next;
} while (bh != head);
+ unlock_page(page);
/* If no i/o was started, need to end_page_writeback(). */
if (unlikely(need_end_writeback))