diff options
| author | Anton Altaparmakov <aia21@cantab.net> | 2005-09-08 22:13:02 +0100 |
|---|---|---|
| committer | Anton Altaparmakov <aia21@cantab.net> | 2005-09-08 22:13:02 +0100 |
| commit | e604635c8bea16f6177e6133eb3efbfb4a029ef6 (patch) | |
| tree | d0d7237d58ee4200123701c61ffb35a88872c04c /fs/ntfs | |
| parent | a01ac532b519dc0e0b4d8bc4e12373e4e4cd1b1a (diff) | |
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 <aia21@cantab.net>
Diffstat (limited to 'fs/ntfs')
| -rw-r--r-- | fs/ntfs/ChangeLog | 3 | ||||
| -rw-r--r-- | fs/ntfs/aops.c | 15 |
2 files changed, 12 insertions, 6 deletions
diff --git a/fs/ntfs/ChangeLog b/fs/ntfs/ChangeLog index 029f856c56c..32a4150ebcb 100644 --- a/fs/ntfs/ChangeLog +++ b/fs/ntfs/ChangeLog @@ -86,6 +86,9 @@ ToDo/Notes: - Fix fs/ntfs/aops.c::ntfs_{read,write}_block() to handle the case where a concurrent truncate has truncated the runlist under our feet. - Fix page_has_buffers()/page_buffers() handling in fs/ntfs/aops.c. + - In fs/ntfs/aops.c::ntfs_end_buffer_async_read(), use a bit spin lock + in the first buffer head instead of a driver global spin lock to + improve scalability. 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 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; } |