pnfsblock: add blocklayout Kconfig option, Makefile, and stubs
Define a configuration variable to enable/disable compilation of the
block driver code.
Add the minimal structure for a pnfs block layout driver, and empty
list-heads that will hold the extent data
[pnfsblock: make NFS_V4_1 select PNFS_BLOCK]
Signed-off-by: Peng Tao <peng_tao@emc.com>
Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[pnfs-block: fix CONFIG_PNFS_BLOCK dependencies]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Benny Halevy <bhalevy@tonian.com>
[pnfsblock: SQUASHME: adjust to API change]
Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
[pnfs: move pnfs_layout_type inline in nfs_inode]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[blocklayout: encode_layoutcommit implementation]
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Benny Halevy <bhalevy@tonian.com>
[pnfsblock: layout alloc and free]
Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
[pnfs: move pnfs_layout_type inline in nfs_inode]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Benny Halevy <bhalevy@tonian.com>
[pnfsblock: define module alias]
Signed-off-by: Peng Tao <peng_tao@emc.com>
[rm inode and pnfs_layout_hdr args from cleanup_layoutcommit()]
Signed-off-by: Jim Rees <rees@umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/blocklayout/blocklayout.h b/fs/nfs/blocklayout/blocklayout.h
new file mode 100644
index 0000000..8bfa466
--- /dev/null
+++ b/fs/nfs/blocklayout/blocklayout.h
@@ -0,0 +1,91 @@
+/*
+ * 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.
+ */
+#ifndef FS_NFS_NFS4BLOCKLAYOUT_H
+#define FS_NFS_NFS4BLOCKLAYOUT_H
+
+#include <linux/device-mapper.h>
+#include <linux/nfs_fs.h>
+#include "../pnfs.h"
+
+enum exstate4 {
+ PNFS_BLOCK_READWRITE_DATA = 0,
+ PNFS_BLOCK_READ_DATA = 1,
+ PNFS_BLOCK_INVALID_DATA = 2, /* mapped, but data is invalid */
+ PNFS_BLOCK_NONE_DATA = 3 /* unmapped, it's a hole */
+};
+
+struct pnfs_inval_markings {
+ /* STUB */
+};
+
+/* sector_t fields are all in 512-byte sectors */
+struct pnfs_block_extent {
+ struct kref be_refcnt;
+ struct list_head be_node; /* link into lseg list */
+ struct nfs4_deviceid be_devid; /* FIXME: could use device cache instead */
+ struct block_device *be_mdev;
+ sector_t be_f_offset; /* the starting offset in the file */
+ sector_t be_length; /* the size of the extent */
+ sector_t be_v_offset; /* the starting offset in the volume */
+ enum exstate4 be_state; /* the state of this extent */
+ struct pnfs_inval_markings *be_inval; /* tracks INVAL->RW transition */
+};
+
+static inline void
+BL_INIT_INVAL_MARKS(struct pnfs_inval_markings *marks, sector_t blocksize)
+{
+ /* STUB */
+}
+
+enum extentclass4 {
+ RW_EXTENT = 0, /* READWRTE and INVAL */
+ RO_EXTENT = 1, /* READ and NONE */
+ EXTENT_LISTS = 2,
+};
+
+struct pnfs_block_layout {
+ struct pnfs_layout_hdr bl_layout;
+ struct pnfs_inval_markings bl_inval; /* tracks INVAL->RW transition */
+ spinlock_t bl_ext_lock; /* Protects list manipulation */
+ struct list_head bl_extents[EXTENT_LISTS]; /* R and RW extents */
+ struct list_head bl_commit; /* Needs layout commit */
+ struct list_head bl_committing; /* Layout committing */
+ unsigned int bl_count; /* entries in bl_commit */
+ sector_t bl_blocksize; /* Server blocksize in sectors */
+};
+
+static inline struct pnfs_block_layout *BLK_LO2EXT(struct pnfs_layout_hdr *lo)
+{
+ return container_of(lo, struct pnfs_block_layout, bl_layout);
+}
+
+#endif /* FS_NFS_NFS4BLOCKLAYOUT_H */