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authorFred Isaman <iisaman@citi.umich.edu>2011-07-30 20:52:41 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2011-07-31 12:18:16 -0400
commit9e69296999362c4e4b2821b64389b47e86e4821b (patch)
treee8810b4207cc054086eaeb519aa53d2af621ff0d /fs/nfs/blocklayout/extents.c
parente9643fe80d1a1e0ad6acdf43138c39b5709fdbbe (diff)
pnfsblock: basic extent code
Adds structures and basic create/delete code for extents. Signed-off-by: Fred Isaman <iisaman@citi.umich.edu> Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Zhang Jingwang <Jingwang.Zhang@emc.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.c89
1 files changed, 89 insertions, 0 deletions
diff --git a/fs/nfs/blocklayout/extents.c b/fs/nfs/blocklayout/extents.c
new file mode 100644
index 00000000000..d0ca7604d33
--- /dev/null
+++ b/fs/nfs/blocklayout/extents.c
@@ -0,0 +1,89 @@
+/*
+ * linux/fs/nfs/blocklayout/blocklayout.h
+ *
+ * Module for the NFSv4.1 pNFS block layout driver.
+ *
+ * Copyright (c) 2006 The Regents of the University of Michigan.
+ * All rights reserved.
+ *
+ * Andy Adamson <andros@citi.umich.edu>
+ * Fred Isaman <iisaman@umich.edu>
+ *
+ * permission is granted to use, copy, create derivative works and
+ * redistribute this software and such derivative works for any purpose,
+ * so long as the name of the university of michigan is not used in
+ * any advertising or publicity pertaining to the use or distribution
+ * of this software without specific, written prior authorization. if
+ * the above copyright notice or any other identification of the
+ * university of michigan is included in any copy of any portion of
+ * this software, then the disclaimer below must also be included.
+ *
+ * this software is provided as is, without representation from the
+ * university of michigan as to its fitness for any purpose, and without
+ * warranty by the university of michigan of any kind, either express
+ * or implied, including without limitation the implied warranties of
+ * merchantability and fitness for a particular purpose. the regents
+ * of the university of michigan shall not be liable for any damages,
+ * including special, indirect, incidental, or consequential damages,
+ * with respect to any claim arising out or in connection with the use
+ * of the software, even if it has been or is hereafter advised of the
+ * possibility of such damages.
+ */
+
+#include "blocklayout.h"
+#define NFSDBG_FACILITY NFSDBG_PNFS_LD
+
+static void print_bl_extent(struct pnfs_block_extent *be)
+{
+ dprintk("PRINT EXTENT extent %p\n", be);
+ if (be) {
+ dprintk(" be_f_offset %llu\n", (u64)be->be_f_offset);
+ dprintk(" be_length %llu\n", (u64)be->be_length);
+ dprintk(" be_v_offset %llu\n", (u64)be->be_v_offset);
+ dprintk(" be_state %d\n", be->be_state);
+ }
+}
+
+static void
+destroy_extent(struct kref *kref)
+{
+ struct pnfs_block_extent *be;
+
+ be = container_of(kref, struct pnfs_block_extent, be_refcnt);
+ dprintk("%s be=%p\n", __func__, be);
+ kfree(be);
+}
+
+void
+bl_put_extent(struct pnfs_block_extent *be)
+{
+ if (be) {
+ dprintk("%s enter %p (%i)\n", __func__, be,
+ atomic_read(&be->be_refcnt.refcount));
+ kref_put(&be->be_refcnt, destroy_extent);
+ }
+}
+
+struct pnfs_block_extent *bl_alloc_extent(void)
+{
+ struct pnfs_block_extent *be;
+
+ be = kmalloc(sizeof(struct pnfs_block_extent), GFP_NOFS);
+ if (!be)
+ return NULL;
+ INIT_LIST_HEAD(&be->be_node);
+ kref_init(&be->be_refcnt);
+ be->be_inval = NULL;
+ return be;
+}
+
+static void print_elist(struct list_head *list)
+{
+ struct pnfs_block_extent *be;
+ dprintk("****************\n");
+ dprintk("Extent list looks like:\n");
+ list_for_each_entry(be, list, be_node) {
+ print_bl_extent(be);
+ }
+ dprintk("****************\n");
+}