From: Fred Isaman <iisaman@xxxxxxxxxxxxxx>
Adds structures and basic create/delete code for extents.
Signed-off-by: Fred Isaman <iisaman@xxxxxxxxxxxxxx>
Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
Signed-off-by: Zhang Jingwang <Jingwang.Zhang@xxxxxxx>
---
fs/nfs/blocklayout/Makefile | 2 +-
fs/nfs/blocklayout/blocklayout.c | 20 ++++++--
fs/nfs/blocklayout/blocklayout.h | 1 +
fs/nfs/blocklayout/extents.c | 97 ++++++++++++++++++++++++++++++++++++++
4 files changed, 115 insertions(+), 5 deletions(-)
create mode 100644 fs/nfs/blocklayout/extents.c
diff --git a/fs/nfs/blocklayout/Makefile b/fs/nfs/blocklayout/Makefile
index d2bcd81..af39d19 100644
--- a/fs/nfs/blocklayout/Makefile
+++ b/fs/nfs/blocklayout/Makefile
@@ -2,4 +2,4 @@
# Makefile for the pNFS block layout driver kernel module
#
obj-$(CONFIG_PNFS_BLOCK) += blocklayoutdriver.o
-blocklayoutdriver-objs := blocklayout.o block-device-discovery-pipe.o
+blocklayoutdriver-objs := blocklayout.o block-device-discovery-pipe.o extents.o
diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index bc6a0b2..4ca0838 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -53,12 +53,24 @@ bl_write_pagelist(struct nfs_write_data *wdata,
return PNFS_NOT_ATTEMPTED;
}
-/* STUB */
+/* FIXME - range ignored */
static void
-release_extents(struct pnfs_block_layout *bl,
- struct pnfs_layout_range *range)
-{
- return;
+release_extents(struct pnfs_block_layout *bl, struct pnfs_layout_range *range)
+{
+ int i;
+ struct pnfs_block_extent *be;
+
+ spin_lock(&bl->bl_ext_lock);
+ for (i = 0; i < EXTENT_LISTS; i++) {
+ while (!list_empty(&bl->bl_extents[i])) {
+ be = list_first_entry(&bl->bl_extents[i],
+ struct pnfs_block_extent,
+ be_node);
+ list_del(&be->be_node);
+ put_extent(be);
+ }
+ }
+ spin_unlock(&bl->bl_ext_lock);
}
/* STUB */
diff --git a/fs/nfs/blocklayout/blocklayout.h b/fs/nfs/blocklayout/blocklayout.h
index 4b8608c..c1825ae 100644
--- a/fs/nfs/blocklayout/blocklayout.h
+++ b/fs/nfs/blocklayout/blocklayout.h
@@ -101,4 +101,5 @@ void bl_pipe_exit(void);
#define BL_DEVICE_REQUEST_PROC 0x1 /* User level process succeeds */
#define BL_DEVICE_REQUEST_ERR 0x2 /* User level process fails */
+void put_extent(struct pnfs_block_extent *be);
#endif /* FS_NFS_NFS4BLOCKLAYOUT_H */
diff --git a/fs/nfs/blocklayout/extents.c b/fs/nfs/blocklayout/extents.c
new file mode 100644
index 0000000..1283fa9
--- /dev/null
+++ b/fs/nfs/blocklayout/extents.c
@@ -0,0 +1,97 @@
+/*
+ * 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@xxxxxxxxxxxxxx>
+ * Fred Isaman <iisaman@xxxxxxxxx>
+ *
+ * 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
+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 *alloc_extent(void)
+{
+ struct pnfs_block_extent *be;
+
+ be = kmalloc(sizeof(struct pnfs_block_extent), GFP_KERNEL);
+ if (!be)
+ return NULL;
+ INIT_LIST_HEAD(&be->be_node);
+ kref_init(&be->be_refcnt);
+ be->be_inval = NULL;
+ return be;
+}
+
+struct pnfs_block_extent *
+get_extent(struct pnfs_block_extent *be)
+{
+ if (be)
+ kref_get(&be->be_refcnt);
+ return be;
+}
+
+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");
+}
--
1.7.4.1
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