From a43db30c7c614c08851a97476aeb317ca2e14475 Mon Sep 17 00:00:00 2001 From: Joel Becker Date: Thu, 27 Apr 2006 16:36:14 -0700 Subject: ocfs2: silence -EEXIST from ocfs2_extent_map_insert/lookup Signed-off-by: Joel Becker Signed-off-by: Mark Fasheh --- fs/ocfs2/extent_map.c | 29 ++++++++++++++++++++++------- 1 file changed, 22 insertions(+), 7 deletions(-) diff --git a/fs/ocfs2/extent_map.c b/fs/ocfs2/extent_map.c index 1a5c69071df6..fcd4475d1f89 100644 --- a/fs/ocfs2/extent_map.c +++ b/fs/ocfs2/extent_map.c @@ -298,7 +298,7 @@ static int ocfs2_extent_map_find_leaf(struct inode *inode, ret = ocfs2_extent_map_insert(inode, rec, le16_to_cpu(el->l_tree_depth)); - if (ret) { + if (ret && (ret != -EEXIST)) { mlog_errno(ret); goto out_free; } @@ -427,6 +427,11 @@ static int ocfs2_extent_map_insert_entry(struct ocfs2_extent_map *em, /* * Simple rule: on any return code other than -EAGAIN, anything left * in the insert_context will be freed. + * + * Simple rule #2: A return code of -EEXIST from this function or + * its calls to ocfs2_extent_map_insert_entry() signifies that another + * thread beat us to the insert. It is not an actual error, but it + * tells the caller we have no more work to do. */ static int ocfs2_extent_map_try_insert(struct inode *inode, struct ocfs2_extent_rec *rec, @@ -448,22 +453,32 @@ static int ocfs2_extent_map_try_insert(struct inode *inode, goto out_unlock; } + /* Since insert_entry failed, the map MUST have old_ent */ old_ent = ocfs2_extent_map_lookup(em, le32_to_cpu(rec->e_cpos), - le32_to_cpu(rec->e_clusters), NULL, - NULL); + le32_to_cpu(rec->e_clusters), + NULL, NULL); BUG_ON(!old_ent); - ret = -EEXIST; - if (old_ent->e_tree_depth < tree_depth) + if (old_ent->e_tree_depth < tree_depth) { + /* Another thread beat us to the lower tree_depth */ + ret = -EEXIST; goto out_unlock; + } if (old_ent->e_tree_depth == tree_depth) { + /* + * Another thread beat us to this tree_depth. + * Let's make sure we agree with that thread (the + * extent_rec should be identical). + */ if (!memcmp(rec, &old_ent->e_rec, sizeof(struct ocfs2_extent_rec))) ret = 0; + else + /* FIXME: Should this be ESRCH/EBADR??? */ + ret = -EEXIST; - /* FIXME: Should this be ESRCH/EBADR??? */ goto out_unlock; } @@ -599,7 +614,7 @@ static int ocfs2_extent_map_insert(struct inode *inode, tree_depth, &ctxt); } while (ret == -EAGAIN); - if (ret < 0) + if ((ret < 0) && (ret != -EEXIST)) mlog_errno(ret); if (ctxt.left_ent) -- cgit v1.2.3