From 249ffe18c68ee74dcfb51a16e151b45ee07e1c10 Mon Sep 17 00:00:00 2001 From: Bob Peterson Date: Tue, 18 Aug 2020 11:50:28 -0500 Subject: [PATCH] gfs2: don't lock sd_ail_lock in gfs2_releasepage Patch 380f7c65a7eb3288e4b6812acf3474a1de230707 changed gfs2_releasepage so that it held the sd_ail_lock spin_lock for most of its processing. It did this for some mysterious undocumented bug somewhere in the evict code path. But in the nine years since, evict has been reworked and fixed many times, and so have the transactions and ail list. I can't see a reason to hold the sd_ail_lock unless it's protecting the actual ail lists hung off the transactions. Therefore, this patch removes the locking to increase speed and efficiency, and to further help us rework the log flush code to be more concurrent with transactions. Signed-off-by: Bob Peterson Signed-off-by: Andreas Gruenbacher --- fs/gfs2/aops.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c index 801f244690bf..1e7ab519bfea 100644 --- a/fs/gfs2/aops.c +++ b/fs/gfs2/aops.c @@ -741,7 +741,6 @@ int gfs2_releasepage(struct page *page, gfp_t gfp_mask) */ gfs2_log_lock(sdp); - spin_lock(&sdp->sd_ail_lock); head = bh = page_buffers(page); do { if (atomic_read(&bh->b_count)) @@ -753,7 +752,6 @@ int gfs2_releasepage(struct page *page, gfp_t gfp_mask) goto cannot_release; bh = bh->b_this_page; } while(bh != head); - spin_unlock(&sdp->sd_ail_lock); head = bh = page_buffers(page); do { @@ -779,7 +777,6 @@ int gfs2_releasepage(struct page *page, gfp_t gfp_mask) return try_to_free_buffers(page); cannot_release: - spin_unlock(&sdp->sd_ail_lock); gfs2_log_unlock(sdp); return 0; }