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authorFred Isaman <iisaman@citi.umich.edu>2011-07-30 20:52:50 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2011-07-31 12:18:17 -0400
commit9f3770422c771da32c1d14e650c695eec27dbd1d (patch)
tree5c0ce4d8af872198c21c0fe3fd21fc8bf06a2d4b /fs/nfs/blocklayout/extents.c
parentc1c2a4cd352269f1fb585b4a5c63abe24dd946c6 (diff)
pnfsblock: merge rw extents
Signed-off-by: Fred Isaman <iisaman@citi.umich.edu> Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Benny Halevy <bhalevy@tonian.com> Signed-off-by: Jim Rees <rees@umich.edu> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/blocklayout/extents.c')
-rw-r--r--fs/nfs/blocklayout/extents.c47
1 files changed, 47 insertions, 0 deletions
diff --git a/fs/nfs/blocklayout/extents.c b/fs/nfs/blocklayout/extents.c
index 473faee9cde..292aadfd4d4 100644
--- a/fs/nfs/blocklayout/extents.c
+++ b/fs/nfs/blocklayout/extents.c
@@ -493,3 +493,50 @@ bl_find_get_extent(struct pnfs_block_layout *bl, sector_t isect,
print_bl_extent(ret);
return ret;
}
+
+/* Helper function to set_to_rw that initialize a new extent */
+static void
+_prep_new_extent(struct pnfs_block_extent *new,
+ struct pnfs_block_extent *orig,
+ sector_t offset, sector_t length, int state)
+{
+ kref_init(&new->be_refcnt);
+ /* don't need to INIT_LIST_HEAD(&new->be_node) */
+ memcpy(&new->be_devid, &orig->be_devid, sizeof(struct nfs4_deviceid));
+ new->be_mdev = orig->be_mdev;
+ new->be_f_offset = offset;
+ new->be_length = length;
+ new->be_v_offset = orig->be_v_offset - orig->be_f_offset + offset;
+ new->be_state = state;
+ new->be_inval = orig->be_inval;
+}
+
+/* Tries to merge be with extent in front of it in list.
+ * Frees storage if not used.
+ */
+static struct pnfs_block_extent *
+_front_merge(struct pnfs_block_extent *be, struct list_head *head,
+ struct pnfs_block_extent *storage)
+{
+ struct pnfs_block_extent *prev;
+
+ if (!storage)
+ goto no_merge;
+ if (&be->be_node == head || be->be_node.prev == head)
+ goto no_merge;
+ prev = list_entry(be->be_node.prev, struct pnfs_block_extent, be_node);
+ if ((prev->be_f_offset + prev->be_length != be->be_f_offset) ||
+ !extents_consistent(prev, be))
+ goto no_merge;
+ _prep_new_extent(storage, prev, prev->be_f_offset,
+ prev->be_length + be->be_length, prev->be_state);
+ list_replace(&prev->be_node, &storage->be_node);
+ bl_put_extent(prev);
+ list_del(&be->be_node);
+ bl_put_extent(be);
+ return storage;
+
+ no_merge:
+ kfree(storage);
+ return be;
+}