fs/btrfs/btrfs_inode.h - kernel/msm-4.19 - Gitiles

 /*
  * Copyright (C) 2007 Oracle.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public
  * License v2 as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * General Public License for more details.
  *
  * You should have received a copy of the GNU General Public
  * License along with this program; if not, write to the
  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  * Boston, MA 021110-1307, USA.
  */

 #ifndef __BTRFS_I__
 #define __BTRFS_I__

 #include <linux/hash.h>
 #include "extent_map.h"
 #include "extent_io.h"
 #include "ordered-data.h"
 #include "delayed-inode.h"

 /*
  * ordered_data_close is set by truncate when a file that used
  * to have good data has been truncated to zero.  When it is set
  * the btrfs file release call will add this inode to the
  * ordered operations list so that we make sure to flush out any
  * new data the application may have written before commit.
  */
 #define BTRFS_INODE_ORDERED_DATA_CLOSE		0
 #define BTRFS_INODE_ORPHAN_META_RESERVED	1
 #define BTRFS_INODE_DUMMY			2
 #define BTRFS_INODE_IN_DEFRAG			3
 #define BTRFS_INODE_DELALLOC_META_RESERVED	4
 #define BTRFS_INODE_HAS_ORPHAN_ITEM		5
 #define BTRFS_INODE_HAS_ASYNC_EXTENT		6
 #define BTRFS_INODE_NEEDS_FULL_SYNC		7
 #define BTRFS_INODE_COPY_EVERYTHING		8
 #define BTRFS_INODE_IN_DELALLOC_LIST		9
 #define BTRFS_INODE_READDIO_NEED_LOCK		10
 #define BTRFS_INODE_HAS_PROPS		        11

 /* in memory btrfs inode */
 struct btrfs_inode {
 	/* which subvolume this inode belongs to */
 	struct btrfs_root *root;

 	/* key used to find this inode on disk.  This is used by the code
 	 * to read in roots of subvolumes
 	 */
 	struct btrfs_key location;

 	/*
 	 * Lock for counters and all fields used to determine if the inode is in
 	 * the log or not (last_trans, last_sub_trans, last_log_commit,
 	 * logged_trans).
 	 */
 	spinlock_t lock;

 	/* the extent_tree has caches of all the extent mappings to disk */
 	struct extent_map_tree extent_tree;

 	/* the io_tree does range state (DIRTY, LOCKED etc) */
 	struct extent_io_tree io_tree;

 	/* special utility tree used to record which mirrors have already been
 	 * tried when checksums fail for a given block
 	 */
 	struct extent_io_tree io_failure_tree;

 	/* held while logging the inode in tree-log.c */
 	struct mutex log_mutex;

 	/* held while doing delalloc reservations */
 	struct mutex delalloc_mutex;

 	/* used to order data wrt metadata */
 	struct btrfs_ordered_inode_tree ordered_tree;

 	/* list of all the delalloc inodes in the FS.  There are times we need
 	 * to write all the delalloc pages to disk, and this list is used
 	 * to walk them all.
 	 */
 	struct list_head delalloc_inodes;

 	/* node for the red-black tree that links inodes in subvolume root */
 	struct rb_node rb_node;

 	unsigned long runtime_flags;

 	/* Keep track of who's O_SYNC/fsyncing currently */
 	atomic_t sync_writers;

 	/* full 64 bit generation number, struct vfs_inode doesn't have a big
 	 * enough field for this.
 	 */
 	u64 generation;

 	/*
 	 * transid of the trans_handle that last modified this inode
 	 */
 	u64 last_trans;

 	/*
 	 * transid that last logged this inode
 	 */
 	u64 logged_trans;

 	/*
 	 * log transid when this inode was last modified
 	 */
 	int last_sub_trans;

 	/* a local copy of root's last_log_commit */
 	int last_log_commit;

 	/* total number of bytes pending delalloc, used by stat to calc the
 	 * real block usage of the file
 	 */
 	u64 delalloc_bytes;

 	/*
 	 * total number of bytes pending defrag, used by stat to check whether
 	 * it needs COW.
 	 */
 	u64 defrag_bytes;

 	/*
 	 * the size of the file stored in the metadata on disk.  data=ordered
 	 * means the in-memory i_size might be larger than the size on disk
 	 * because not all the blocks are written yet.
 	 */
 	u64 disk_i_size;

 	/*
 	 * if this is a directory then index_cnt is the counter for the index
 	 * number for new files that are created
 	 */
 	u64 index_cnt;

 	/* Cache the directory index number to speed the dir/file remove */
 	u64 dir_index;

 	/* the fsync log has some corner cases that mean we have to check
 	 * directories to see if any unlinks have been done before
 	 * the directory was logged.  See tree-log.c for all the
 	 * details
 	 */
 	u64 last_unlink_trans;

 	/*
 	 * Number of bytes outstanding that are going to need csums.  This is
 	 * used in ENOSPC accounting.
 	 */
 	u64 csum_bytes;

 	/* flags field from the on disk inode */
 	u32 flags;

 	/*
 	 * Counters to keep track of the number of extent item's we may use due
 	 * to delalloc and such.  outstanding_extents is the number of extent
 	 * items we think we'll end up using, and reserved_extents is the number
 	 * of extent items we've reserved metadata for.
 	 */
 	unsigned outstanding_extents;
 	unsigned reserved_extents;

 	/*
 	 * always compress this one file
 	 */
 	unsigned force_compress;

 	struct btrfs_delayed_node *delayed_node;

 	/* File creation time. */
 	struct timespec i_otime;

 	/* Hook into fs_info->delayed_iputs */
 	struct list_head delayed_iput;
 	long delayed_iput_count;

 	/*
 	 * To avoid races between lockless (i_mutex not held) direct IO writes
 	 * and concurrent fsync requests. Direct IO writes must acquire read
 	 * access on this semaphore for creating an extent map and its
 	 * corresponding ordered extent. The fast fsync path must acquire write
 	 * access on this semaphore before it collects ordered extents and
 	 * extent maps.
 	 */
 	struct rw_semaphore dio_sem;

 	struct inode vfs_inode;
 };

 extern unsigned char btrfs_filetype_table[];

 static inline struct btrfs_inode *BTRFS_I(struct inode *inode)
 {
 	return container_of(inode, struct btrfs_inode, vfs_inode);
 }

 static inline unsigned long btrfs_inode_hash(u64 objectid,
 					     const struct btrfs_root *root)
 {
 	u64 h = objectid ^ (root->objectid * GOLDEN_RATIO_PRIME);

 #if BITS_PER_LONG == 32
 	h = (h >> 32) ^ (h & 0xffffffff);
 #endif

 	return (unsigned long)h;
 }

 static inline void btrfs_insert_inode_hash(struct inode *inode)
 {
 	unsigned long h = btrfs_inode_hash(inode->i_ino, BTRFS_I(inode)->root);

 	__insert_inode_hash(inode, h);
 }

 static inline u64 btrfs_ino(struct inode *inode)
 {
 	u64 ino = BTRFS_I(inode)->location.objectid;

 	/*
 	 * !ino: btree_inode
 	 * type == BTRFS_ROOT_ITEM_KEY: subvol dir
 	 */
 	if (!ino || BTRFS_I(inode)->location.type == BTRFS_ROOT_ITEM_KEY)
 		ino = inode->i_ino;
 	return ino;
 }

 static inline void btrfs_i_size_write(struct inode *inode, u64 size)
 {
 	i_size_write(inode, size);
 	BTRFS_I(inode)->disk_i_size = size;
 }

 static inline bool btrfs_is_free_space_inode(struct inode *inode)
 {
 	struct btrfs_root *root = BTRFS_I(inode)->root;

 	if (root == root->fs_info->tree_root &&
 	    btrfs_ino(inode) != BTRFS_BTREE_INODE_OBJECTID)
 		return true;
 	if (BTRFS_I(inode)->location.objectid == BTRFS_FREE_INO_OBJECTID)
 		return true;
 	return false;
 }

 static inline int btrfs_inode_in_log(struct inode *inode, u64 generation)
 {
 	int ret = 0;

 	spin_lock(&BTRFS_I(inode)->lock);
 	if (BTRFS_I(inode)->logged_trans == generation &&
 	    BTRFS_I(inode)->last_sub_trans <=
 	    BTRFS_I(inode)->last_log_commit &&
 	    BTRFS_I(inode)->last_sub_trans <=
 	    BTRFS_I(inode)->root->last_log_commit) {
 		/*
 		 * After a ranged fsync we might have left some extent maps
 		 * (that fall outside the fsync's range). So return false
 		 * here if the list isn't empty, to make sure btrfs_log_inode()
 		 * will be called and process those extent maps.
 		 */
 		smp_mb();
 		if (list_empty(&BTRFS_I(inode)->extent_tree.modified_extents))
 			ret = 1;
 	}
 	spin_unlock(&BTRFS_I(inode)->lock);
 	return ret;
 }

 #define BTRFS_DIO_ORIG_BIO_SUBMITTED	0x1

 struct btrfs_dio_private {
 	struct inode *inode;
 	unsigned long flags;
 	u64 logical_offset;
 	u64 disk_bytenr;
 	u64 bytes;
 	void *private;

 	/* number of bios pending for this dio */
 	atomic_t pending_bios;

 	/* IO errors */
 	int errors;

 	/* orig_bio is our btrfs_io_bio */
 	struct bio *orig_bio;

 	/* dio_bio came from fs/direct-io.c */
 	struct bio *dio_bio;

 	/*
 	 * The original bio may be split to several sub-bios, this is
 	 * done during endio of sub-bios
 	 */
 	int (*subio_endio)(struct inode *, struct btrfs_io_bio *, int);
 };

 /*
  * Disable DIO read nolock optimization, so new dio readers will be forced
  * to grab i_mutex. It is used to avoid the endless truncate due to
  * nonlocked dio read.
  */
 static inline void btrfs_inode_block_unlocked_dio(struct inode *inode)
 {
 	set_bit(BTRFS_INODE_READDIO_NEED_LOCK, &BTRFS_I(inode)->runtime_flags);
 	smp_mb();
 }

 static inline void btrfs_inode_resume_unlocked_dio(struct inode *inode)
 {
 	smp_mb__before_atomic();
 	clear_bit(BTRFS_INODE_READDIO_NEED_LOCK,
 		  &BTRFS_I(inode)->runtime_flags);
 }

 bool btrfs_page_exists_in_range(struct inode *inode, loff_t start, loff_t end);

 #endif
	/*
	* Copyright (C) 2007 Oracle. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public
	* License v2 as published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public
	* License along with this program; if not, write to the
	* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	* Boston, MA 021110-1307, USA.
	*/

	#ifndef __BTRFS_I__
	#define __BTRFS_I__

	#include <linux/hash.h>
	#include "extent_map.h"
	#include "extent_io.h"
	#include "ordered-data.h"
	#include "delayed-inode.h"

	/*
	* ordered_data_close is set by truncate when a file that used
	* to have good data has been truncated to zero. When it is set
	* the btrfs file release call will add this inode to the
	* ordered operations list so that we make sure to flush out any
	* new data the application may have written before commit.
	*/
	#define BTRFS_INODE_ORDERED_DATA_CLOSE 0
	#define BTRFS_INODE_ORPHAN_META_RESERVED 1
	#define BTRFS_INODE_DUMMY 2
	#define BTRFS_INODE_IN_DEFRAG 3
	#define BTRFS_INODE_DELALLOC_META_RESERVED 4
	#define BTRFS_INODE_HAS_ORPHAN_ITEM 5
	#define BTRFS_INODE_HAS_ASYNC_EXTENT 6
	#define BTRFS_INODE_NEEDS_FULL_SYNC 7
	#define BTRFS_INODE_COPY_EVERYTHING 8
	#define BTRFS_INODE_IN_DELALLOC_LIST 9
	#define BTRFS_INODE_READDIO_NEED_LOCK 10
	#define BTRFS_INODE_HAS_PROPS 11

	/* in memory btrfs inode */
	struct btrfs_inode {
	/* which subvolume this inode belongs to */
	struct btrfs_root *root;

	/* key used to find this inode on disk. This is used by the code
	* to read in roots of subvolumes
	*/
	struct btrfs_key location;

	/*
	* Lock for counters and all fields used to determine if the inode is in
	* the log or not (last_trans, last_sub_trans, last_log_commit,
	* logged_trans).
	*/
	spinlock_t lock;

	/* the extent_tree has caches of all the extent mappings to disk */
	struct extent_map_tree extent_tree;

	/* the io_tree does range state (DIRTY, LOCKED etc) */
	struct extent_io_tree io_tree;

	/* special utility tree used to record which mirrors have already been
	* tried when checksums fail for a given block
	*/
	struct extent_io_tree io_failure_tree;

	/* held while logging the inode in tree-log.c */
	struct mutex log_mutex;

	/* held while doing delalloc reservations */
	struct mutex delalloc_mutex;

	/* used to order data wrt metadata */
	struct btrfs_ordered_inode_tree ordered_tree;

	/* list of all the delalloc inodes in the FS. There are times we need
	* to write all the delalloc pages to disk, and this list is used
	* to walk them all.
	*/
	struct list_head delalloc_inodes;

	/* node for the red-black tree that links inodes in subvolume root */
	struct rb_node rb_node;

	unsigned long runtime_flags;

	/* Keep track of who's O_SYNC/fsyncing currently */
	atomic_t sync_writers;

	/* full 64 bit generation number, struct vfs_inode doesn't have a big
	* enough field for this.
	*/
	u64 generation;

	/*
	* transid of the trans_handle that last modified this inode
	*/
	u64 last_trans;

	/*
	* transid that last logged this inode
	*/
	u64 logged_trans;

	/*
	* log transid when this inode was last modified
	*/
	int last_sub_trans;

	/* a local copy of root's last_log_commit */
	int last_log_commit;

	/* total number of bytes pending delalloc, used by stat to calc the
	* real block usage of the file
	*/
	u64 delalloc_bytes;

	/*
	* total number of bytes pending defrag, used by stat to check whether
	* it needs COW.
	*/
	u64 defrag_bytes;

	/*
	* the size of the file stored in the metadata on disk. data=ordered
	* means the in-memory i_size might be larger than the size on disk
	* because not all the blocks are written yet.
	*/
	u64 disk_i_size;

	/*
	* if this is a directory then index_cnt is the counter for the index
	* number for new files that are created
	*/
	u64 index_cnt;

	/* Cache the directory index number to speed the dir/file remove */
	u64 dir_index;

	/* the fsync log has some corner cases that mean we have to check
	* directories to see if any unlinks have been done before
	* the directory was logged. See tree-log.c for all the
	* details
	*/
	u64 last_unlink_trans;

	/*
	* Number of bytes outstanding that are going to need csums. This is
	* used in ENOSPC accounting.
	*/
	u64 csum_bytes;

	/* flags field from the on disk inode */
	u32 flags;

	/*
	* Counters to keep track of the number of extent item's we may use due
	* to delalloc and such. outstanding_extents is the number of extent
	* items we think we'll end up using, and reserved_extents is the number
	* of extent items we've reserved metadata for.
	*/
	unsigned outstanding_extents;
	unsigned reserved_extents;

	/*
	* always compress this one file
	*/
	unsigned force_compress;

	struct btrfs_delayed_node *delayed_node;

	/* File creation time. */
	struct timespec i_otime;

	/* Hook into fs_info->delayed_iputs */
	struct list_head delayed_iput;
	long delayed_iput_count;

	/*
	* To avoid races between lockless (i_mutex not held) direct IO writes
	* and concurrent fsync requests. Direct IO writes must acquire read
	* access on this semaphore for creating an extent map and its
	* corresponding ordered extent. The fast fsync path must acquire write
	* access on this semaphore before it collects ordered extents and
	* extent maps.
	*/
	struct rw_semaphore dio_sem;

	struct inode vfs_inode;
	};

	extern unsigned char btrfs_filetype_table[];

	static inline struct btrfs_inode BTRFS_I(struct inode inode)
	{
	return container_of(inode, struct btrfs_inode, vfs_inode);
	}

	static inline unsigned long btrfs_inode_hash(u64 objectid,
	const struct btrfs_root *root)
	{
	u64 h = objectid ^ (root->objectid * GOLDEN_RATIO_PRIME);

	#if BITS_PER_LONG == 32
	h = (h >> 32) ^ (h & 0xffffffff);
	#endif

	return (unsigned long)h;
	}

	static inline void btrfs_insert_inode_hash(struct inode *inode)
	{
	unsigned long h = btrfs_inode_hash(inode->i_ino, BTRFS_I(inode)->root);

	__insert_inode_hash(inode, h);
	}

	static inline u64 btrfs_ino(struct inode *inode)
	{
	u64 ino = BTRFS_I(inode)->location.objectid;

	/*
	* !ino: btree_inode
	* type == BTRFS_ROOT_ITEM_KEY: subvol dir
	*/
	if (!ino \|\| BTRFS_I(inode)->location.type == BTRFS_ROOT_ITEM_KEY)
	ino = inode->i_ino;
	return ino;
	}

	static inline void btrfs_i_size_write(struct inode *inode, u64 size)
	{
	i_size_write(inode, size);
	BTRFS_I(inode)->disk_i_size = size;
	}

	static inline bool btrfs_is_free_space_inode(struct inode *inode)
	{
	struct btrfs_root *root = BTRFS_I(inode)->root;

	if (root == root->fs_info->tree_root &&
	btrfs_ino(inode) != BTRFS_BTREE_INODE_OBJECTID)
	return true;
	if (BTRFS_I(inode)->location.objectid == BTRFS_FREE_INO_OBJECTID)
	return true;
	return false;
	}

	static inline int btrfs_inode_in_log(struct inode *inode, u64 generation)
	{
	int ret = 0;

	spin_lock(&BTRFS_I(inode)->lock);
	if (BTRFS_I(inode)->logged_trans == generation &&
	BTRFS_I(inode)->last_sub_trans <=
	BTRFS_I(inode)->last_log_commit &&
	BTRFS_I(inode)->last_sub_trans <=
	BTRFS_I(inode)->root->last_log_commit) {
	/*
	* After a ranged fsync we might have left some extent maps
	* (that fall outside the fsync's range). So return false
	* here if the list isn't empty, to make sure btrfs_log_inode()
	* will be called and process those extent maps.
	*/
	smp_mb();
	if (list_empty(&BTRFS_I(inode)->extent_tree.modified_extents))
	ret = 1;
	}
	spin_unlock(&BTRFS_I(inode)->lock);
	return ret;
	}

	#define BTRFS_DIO_ORIG_BIO_SUBMITTED 0x1

	struct btrfs_dio_private {
	struct inode *inode;
	unsigned long flags;
	u64 logical_offset;
	u64 disk_bytenr;
	u64 bytes;
	void *private;

	/* number of bios pending for this dio */
	atomic_t pending_bios;

	/* IO errors */
	int errors;

	/* orig_bio is our btrfs_io_bio */
	struct bio *orig_bio;

	/* dio_bio came from fs/direct-io.c */
	struct bio *dio_bio;

	/*
	* The original bio may be split to several sub-bios, this is
	* done during endio of sub-bios
	*/
	int (subio_endio)(struct inode , struct btrfs_io_bio *, int);
	};

	/*
	* Disable DIO read nolock optimization, so new dio readers will be forced
	* to grab i_mutex. It is used to avoid the endless truncate due to
	* nonlocked dio read.
	*/
	static inline void btrfs_inode_block_unlocked_dio(struct inode *inode)
	{
	set_bit(BTRFS_INODE_READDIO_NEED_LOCK, &BTRFS_I(inode)->runtime_flags);
	smp_mb();
	}

	static inline void btrfs_inode_resume_unlocked_dio(struct inode *inode)
	{
	smp_mb__before_atomic();
	clear_bit(BTRFS_INODE_READDIO_NEED_LOCK,
	&BTRFS_I(inode)->runtime_flags);
	}

	bool btrfs_page_exists_in_range(struct inode *inode, loff_t start, loff_t end);

	#endif