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| author | Anton Altaparmakov <aia21@cantab.net> | 2005-09-08 22:43:47 +0200 |
|---|---|---|
| committer | Anton Altaparmakov <aia21@cantab.net> | 2005-09-08 22:43:47 +0200 |
| commit | 54b02eb01c0172294e43e2b54d6815f65637c111 (patch) | |
| tree | 0dec3c7f9553f96e3edeab769077723d1ab922e1 | |
| parent | NTFS: Fixup handling of sparse, compressed, and encrypted attributes in (diff) | |
| download | linux-54b02eb01c0172294e43e2b54d6815f65637c111.tar.xz linux-54b02eb01c0172294e43e2b54d6815f65637c111.zip | |
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>
| -rw-r--r-- | fs/ntfs/ChangeLog | 3 | ||||
| -rw-r--r-- | fs/ntfs/aops.c | 13 |
2 files changed, 6 insertions, 10 deletions
diff --git a/fs/ntfs/ChangeLog b/fs/ntfs/ChangeLog index 4b8666d7e7fe..10fc2385efa7 100644 --- a/fs/ntfs/ChangeLog +++ b/fs/ntfs/ChangeLog @@ -81,6 +81,9 @@ ToDo/Notes: only zeroes. - Fixup handling of sparse, compressed, and encrypted attributes in fs/ntfs/aops.c::ntfs_writepage(). + - 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. 2.1.23 - Implement extension of resident files and make writing safe as well as many bug fixes, cleanups, and enhancements... diff --git a/fs/ntfs/aops.c b/fs/ntfs/aops.c index 6f2954aac5a2..821dad7d14c8 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)) |