Btrfs: add inode item (1e1d2701) · Commits · e / devices / android_kernel_fairphone_FP4

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);
		}