Commit 1e1d2701 authored by Chris Mason's avatar Chris Mason Committed by David Woodhouse
Browse files

Btrfs: add inode item 



Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent 1d4f6404

fs/btrfs/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -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

+1 −0
Original line number Diff line number Diff line
@@ -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

+169 −6
Original line number Diff line number Diff line
@@ -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 → 100644
+7 −0
Original line number Diff line number Diff line 
#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 → 100644
+37 −0
Original line number Diff line number Diff line 
#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);

}

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