Btrfs: add inode item

Signed-off-by: Chris Mason <chris.mason@oracle.com>

fs/btrfs/Makefile

@@ -2,7 +2,7 @@ CC=gcc
 CFLAGS = -g -Wall
 headers = radix-tree.h ctree.h disk-io.h kerncompat.h print-tree.h list.h
 objects = ctree.o disk-io.o radix-tree.o mkfs.o extent-tree.o print-tree.o \
-	  root-tree.o dir-item.o hash.o
+	  root-tree.o dir-item.o hash.o file-item.o inode-item.o
 
 # if you don't have sparse installed, use ls instead
 CHECKFLAGS=-D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise \

fs/btrfs/TODO

@@ -9,6 +9,7 @@
 * Add simple tree locking (semaphore per tree)
 * Make allocator smarter
 * Do actual block accounting
+* Check compat and incompat flags on the inode
 * Port into the kernel
 * Add virtual filesystems, mountable snapshots
 * Get rid of struct ctree_path, limiting tree levels held at one time

fs/btrfs/ctree.h

@@ -132,6 +132,37 @@ struct btrfs_extent_item {
 	__le64 owner;
 } __attribute__ ((__packed__));
 
+struct btrfs_inode_timespec {
+	__le32 sec;
+	__le32 nsec;
+} __attribute__ ((__packed__));
+
+/*
+ * there is no padding here on purpose.  If you want to extent the inode,
+ * make a new item type
+ */
+struct btrfs_inode_item {
+	__le64 generation;
+	__le64 size;
+	__le64 nblocks;
+	__le32 nlink;
+	__le32 uid;
+	__le32 gid;
+	__le32 mode;
+	__le32 rdev;
+	__le16 flags;
+	__le16 compat_flags;
+	struct btrfs_inode_timespec atime;
+	struct btrfs_inode_timespec ctime;
+	struct btrfs_inode_timespec mtime;
+	struct btrfs_inode_timespec otime;
+} __attribute__ ((__packed__));
+
+/* inline data is just a blob of bytes */
+struct btrfs_inline_data_item {
+	u8 data;
+} __attribute__ ((__packed__));
+
 struct btrfs_dir_item {
 	__le64 objectid;
 	__le16 flags;
@@ -170,15 +201,149 @@ struct btrfs_root {
 	u32 blocksize;
 };
 
-
 /* the lower bits in the key flags defines the item type */
 #define BTRFS_KEY_TYPE_MAX	256
 #define BTRFS_KEY_TYPE_MASK	(BTRFS_KEY_TYPE_MAX - 1)
+
+/*
+ * inode items have the data typically returned from stat and store other
+ * info about object characteristics.  There is one for every file and dir in
+ * the FS
+ */
 #define BTRFS_INODE_ITEM_KEY	1
+
+/*
+ * dir items are the name -> inode pointers in a directory.  There is one
+ * for every name in a directory.
+ */
 #define BTRFS_DIR_ITEM_KEY	2
-#define BTRFS_ROOT_ITEM_KEY	3
-#define BTRFS_EXTENT_ITEM_KEY	4
-#define BTRFS_STRING_ITEM_KEY	5
+/*
+ * inline data is file data that fits in the btree.
+ */
+#define BTRFS_INLINE_DATA_KEY	3
+/*
+ * extent data is for data that can't fit in the btree.  It points to
+ * a (hopefully) huge chunk of disk
+ */
+#define BTRFS_EXTENT_DATA_KEY	4
+/*
+ * root items point to tree roots.  There are typically in the root
+ * tree used by the super block to find all the other trees
+ */
+#define BTRFS_ROOT_ITEM_KEY	5
+/*
+ * extent items are in the extent map tree.  These record which blocks
+ * are used, and how many references there are to each block
+ */
+#define BTRFS_EXTENT_ITEM_KEY	6
+/*
+ * string items are for debugging.  They just store a short string of
+ * data in the FS
+ */
+#define BTRFS_STRING_ITEM_KEY	7
+
+static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
+{
+	return le64_to_cpu(i->generation);
+}
+
+static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
+					      u64 val)
+{
+	i->generation = cpu_to_le64(val);
+}
+
+static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
+{
+	return le64_to_cpu(i->size);
+}
+
+static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
+{
+	i->size = cpu_to_le64(val);
+}
+
+static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
+{
+	return le64_to_cpu(i->nblocks);
+}
+
+static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
+{
+	i->nblocks = cpu_to_le64(val);
+}
+
+static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
+{
+	return le32_to_cpu(i->nlink);
+}
+
+static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
+{
+	i->nlink = cpu_to_le32(val);
+}
+
+static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
+{
+	return le32_to_cpu(i->uid);
+}
+
+static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
+{
+	i->uid = cpu_to_le32(val);
+}
+
+static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
+{
+	return le32_to_cpu(i->gid);
+}
+
+static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
+{
+	i->gid = cpu_to_le32(val);
+}
+
+static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
+{
+	return le32_to_cpu(i->mode);
+}
+
+static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
+{
+	i->mode = cpu_to_le32(val);
+}
+
+static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
+{
+	return le32_to_cpu(i->rdev);
+}
+
+static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
+{
+	i->rdev = cpu_to_le32(val);
+}
+
+static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
+{
+	return le16_to_cpu(i->flags);
+}
+
+static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
+{
+	i->flags = cpu_to_le16(val);
+}
+
+static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
+{
+	return le16_to_cpu(i->compat_flags);
+}
+
+static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
+						u16 val)
+{
+	i->compat_flags = cpu_to_le16(val);
+}
+
 
 static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
 {
@@ -344,8 +509,6 @@ static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key, u32 type)
 	btrfs_set_disk_key_flags(key, flags);
 }
 
-
-
 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
 {
 	return le64_to_cpu(h->blocknr);

fs/btrfs/file-item.c

@@ -0,0 +1,7 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "kerncompat.h"
+#include "radix-tree.h"
+#include "ctree.h"
+#include "disk-io.h"
+

fs/btrfs/inode-item.c

@@ -0,0 +1,37 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "kerncompat.h"
+#include "radix-tree.h"
+#include "ctree.h"
+#include "disk-io.h"
+
+int btrfs_insert_inode(struct btrfs_root *root, u64 objectid,
+		       struct btrfs_inode_item *inode_item)
+{
+	struct btrfs_path path;
+	struct btrfs_key key;
+	int ret;
+	key.objectid = objectid;
+	key.flags = 0;
+	btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
+	key.offset = 0;
+
+	btrfs_init_path(&path);
+	ret = btrfs_insert_item(root, &key, inode_item, sizeof(*inode_item));
+	btrfs_release_path(root, &path);
+	return ret;
+}
+
+int btrfs_lookup_inode(struct btrfs_root *root, struct btrfs_path *path,
+			u64 objectid, int mod)
+{
+	struct btrfs_key key;
+	int ins_len = mod < 0 ? -1 : 0;
+	int cow = mod != 0;
+
+	key.objectid = objectid;
+	key.flags = 0;
+	btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
+	key.offset = 0;
+	return btrfs_search_slot(root, &key, path, ins_len, cow);
+}