From e604635c8bea16f6177e6133eb3efbfb4a029ef6 Mon Sep 17 00:00:00 2001 From: Anton Altaparmakov Date: Thu, 8 Sep 2005 22:13:02 +0100 Subject: NTFS: Improve scalability by changing the driver global spin lock in fs/ntfs/aops.c::ntfs_end_buffer_async_read() to a bit spin lock in the first buffer head of a page. Signed-off-by: Anton Altaparmakov --- fs/ntfs/aops.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) (limited to 'fs/ntfs/aops.c') diff --git a/fs/ntfs/aops.c b/fs/ntfs/aops.c index 52e1aff98b0..950b686f02d 100644 --- a/fs/ntfs/aops.c +++ b/fs/ntfs/aops.c @@ -55,9 +55,8 @@ */ static void ntfs_end_buffer_async_read(struct buffer_head *bh, int uptodate) { - static DEFINE_SPINLOCK(page_uptodate_lock); unsigned long flags; - struct buffer_head *tmp; + struct buffer_head *first, *tmp; struct page *page; ntfs_inode *ni; int page_uptodate = 1; @@ -89,11 +88,13 @@ static void ntfs_end_buffer_async_read(struct buffer_head *bh, int uptodate) } } else { clear_buffer_uptodate(bh); + SetPageError(page); ntfs_error(ni->vol->sb, "Buffer I/O error, logical block %llu.", (unsigned long long)bh->b_blocknr); - SetPageError(page); } - spin_lock_irqsave(&page_uptodate_lock, flags); + first = page_buffers(page); + local_irq_save(flags); + bit_spin_lock(BH_Uptodate_Lock, &first->b_state); clear_buffer_async_read(bh); unlock_buffer(bh); tmp = bh; @@ -108,7 +109,8 @@ static void ntfs_end_buffer_async_read(struct buffer_head *bh, int uptodate) } tmp = tmp->b_this_page; } while (tmp != bh); - spin_unlock_irqrestore(&page_uptodate_lock, flags); + bit_spin_unlock(BH_Uptodate_Lock, &first->b_state); + local_irq_restore(flags); /* * If none of the buffers had errors then we can set the page uptodate, * but we first have to perform the post read mst fixups, if the @@ -141,7 +143,8 @@ static void ntfs_end_buffer_async_read(struct buffer_head *bh, int uptodate) unlock_page(page); return; still_busy: - spin_unlock_irqrestore(&page_uptodate_lock, flags); + bit_spin_unlock(BH_Uptodate_Lock, &first->b_state); + local_irq_restore(flags); return; } -- cgit v1.2.3