include/linux/ext4_jbd.h - kernel/msm-4.19 - Gitiles

 /*
  * linux/include/linux/ext4_jbd.h
  *
  * Written by Stephen C. Tweedie <sct@redhat.com>, 1999
  *
  * Copyright 1998--1999 Red Hat corp --- All Rights Reserved
  *
  * This file is part of the Linux kernel and is made available under
  * the terms of the GNU General Public License, version 2, or at your
  * option, any later version, incorporated herein by reference.
  *
  * Ext4-specific journaling extensions.
  */

 #ifndef _LINUX_EXT4_JBD_H
 #define _LINUX_EXT4_JBD_H

 #include <linux/fs.h>
 #include <linux/jbd.h>
 #include <linux/ext4_fs.h>

 #define EXT4_JOURNAL(inode)	(EXT4_SB((inode)->i_sb)->s_journal)

 /* Define the number of blocks we need to account to a transaction to
  * modify one block of data.
  *
  * We may have to touch one inode, one bitmap buffer, up to three
  * indirection blocks, the group and superblock summaries, and the data
  * block to complete the transaction.  */

 #define EXT4_SINGLEDATA_TRANS_BLOCKS	8U

 /* Extended attribute operations touch at most two data buffers,
  * two bitmap buffers, and two group summaries, in addition to the inode
  * and the superblock, which are already accounted for. */

 #define EXT4_XATTR_TRANS_BLOCKS		6U

 /* Define the minimum size for a transaction which modifies data.  This
  * needs to take into account the fact that we may end up modifying two
  * quota files too (one for the group, one for the user quota).  The
  * superblock only gets updated once, of course, so don't bother
  * counting that again for the quota updates. */

 #define EXT4_DATA_TRANS_BLOCKS(sb)	(EXT4_SINGLEDATA_TRANS_BLOCKS + \
 					 EXT4_XATTR_TRANS_BLOCKS - 2 + \
 					 2*EXT4_QUOTA_TRANS_BLOCKS(sb))

 /* Delete operations potentially hit one directory's namespace plus an
  * entire inode, plus arbitrary amounts of bitmap/indirection data.  Be
  * generous.  We can grow the delete transaction later if necessary. */

 #define EXT4_DELETE_TRANS_BLOCKS(sb)	(2 * EXT4_DATA_TRANS_BLOCKS(sb) + 64)

 /* Define an arbitrary limit for the amount of data we will anticipate
  * writing to any given transaction.  For unbounded transactions such as
  * write(2) and truncate(2) we can write more than this, but we always
  * start off at the maximum transaction size and grow the transaction
  * optimistically as we go. */

 #define EXT4_MAX_TRANS_DATA		64U

 /* We break up a large truncate or write transaction once the handle's
  * buffer credits gets this low, we need either to extend the
  * transaction or to start a new one.  Reserve enough space here for
  * inode, bitmap, superblock, group and indirection updates for at least
  * one block, plus two quota updates.  Quota allocations are not
  * needed. */

 #define EXT4_RESERVE_TRANS_BLOCKS	12U

 #define EXT4_INDEX_EXTRA_TRANS_BLOCKS	8

 #ifdef CONFIG_QUOTA
 /* Amount of blocks needed for quota update - we know that the structure was
  * allocated so we need to update only inode+data */
 #define EXT4_QUOTA_TRANS_BLOCKS(sb) (test_opt(sb, QUOTA) ? 2 : 0)
 /* Amount of blocks needed for quota insert/delete - we do some block writes
  * but inode, sb and group updates are done only once */
 #define EXT4_QUOTA_INIT_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_INIT_ALLOC*\
 		(EXT4_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_INIT_REWRITE) : 0)
 #define EXT4_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\
 		(EXT4_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_DEL_REWRITE) : 0)
 #else
 #define EXT4_QUOTA_TRANS_BLOCKS(sb) 0
 #define EXT4_QUOTA_INIT_BLOCKS(sb) 0
 #define EXT4_QUOTA_DEL_BLOCKS(sb) 0
 #endif

 int
 ext4_mark_iloc_dirty(handle_t *handle,
 		     struct inode *inode,
 		     struct ext4_iloc *iloc);

 /*
  * On success, We end up with an outstanding reference count against
  * iloc->bh.  This _must_ be cleaned up later.
  */

 int ext4_reserve_inode_write(handle_t *handle, struct inode *inode,
 			struct ext4_iloc *iloc);

 int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode);

 /*
  * Wrapper functions with which ext4 calls into JBD.  The intent here is
  * to allow these to be turned into appropriate stubs so ext4 can control
  * ext2 filesystems, so ext2+ext4 systems only nee one fs.  This work hasn't
  * been done yet.
  */

 void ext4_journal_abort_handle(const char *caller, const char *err_fn,
 		struct buffer_head *bh, handle_t *handle, int err);

 static inline int
 __ext4_journal_get_undo_access(const char *where, handle_t *handle,
 				struct buffer_head *bh)
 {
 	int err = journal_get_undo_access(handle, bh);
 	if (err)
 		ext4_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
 	return err;
 }

 static inline int
 __ext4_journal_get_write_access(const char *where, handle_t *handle,
 				struct buffer_head *bh)
 {
 	int err = journal_get_write_access(handle, bh);
 	if (err)
 		ext4_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
 	return err;
 }

 static inline void
 ext4_journal_release_buffer(handle_t *handle, struct buffer_head *bh)
 {
 	journal_release_buffer(handle, bh);
 }

 static inline int
 __ext4_journal_forget(const char *where, handle_t *handle, struct buffer_head *bh)
 {
 	int err = journal_forget(handle, bh);
 	if (err)
 		ext4_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
 	return err;
 }

 static inline int
 __ext4_journal_revoke(const char *where, handle_t *handle,
 		      unsigned long blocknr, struct buffer_head *bh)
 {
 	int err = journal_revoke(handle, blocknr, bh);
 	if (err)
 		ext4_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
 	return err;
 }

 static inline int
 __ext4_journal_get_create_access(const char *where,
 				 handle_t *handle, struct buffer_head *bh)
 {
 	int err = journal_get_create_access(handle, bh);
 	if (err)
 		ext4_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
 	return err;
 }

 static inline int
 __ext4_journal_dirty_metadata(const char *where,
 			      handle_t *handle, struct buffer_head *bh)
 {
 	int err = journal_dirty_metadata(handle, bh);
 	if (err)
 		ext4_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
 	return err;
 }


 #define ext4_journal_get_undo_access(handle, bh) \
 	__ext4_journal_get_undo_access(__FUNCTION__, (handle), (bh))
 #define ext4_journal_get_write_access(handle, bh) \
 	__ext4_journal_get_write_access(__FUNCTION__, (handle), (bh))
 #define ext4_journal_revoke(handle, blocknr, bh) \
 	__ext4_journal_revoke(__FUNCTION__, (handle), (blocknr), (bh))
 #define ext4_journal_get_create_access(handle, bh) \
 	__ext4_journal_get_create_access(__FUNCTION__, (handle), (bh))
 #define ext4_journal_dirty_metadata(handle, bh) \
 	__ext4_journal_dirty_metadata(__FUNCTION__, (handle), (bh))
 #define ext4_journal_forget(handle, bh) \
 	__ext4_journal_forget(__FUNCTION__, (handle), (bh))

 int ext4_journal_dirty_data(handle_t *handle, struct buffer_head *bh);

 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks);
 int __ext4_journal_stop(const char *where, handle_t *handle);

 static inline handle_t *ext4_journal_start(struct inode *inode, int nblocks)
 {
 	return ext4_journal_start_sb(inode->i_sb, nblocks);
 }

 #define ext4_journal_stop(handle) \
 	__ext4_journal_stop(__FUNCTION__, (handle))

 static inline handle_t *ext4_journal_current_handle(void)
 {
 	return journal_current_handle();
 }

 static inline int ext4_journal_extend(handle_t *handle, int nblocks)
 {
 	return journal_extend(handle, nblocks);
 }

 static inline int ext4_journal_restart(handle_t *handle, int nblocks)
 {
 	return journal_restart(handle, nblocks);
 }

 static inline int ext4_journal_blocks_per_page(struct inode *inode)
 {
 	return journal_blocks_per_page(inode);
 }

 static inline int ext4_journal_force_commit(journal_t *journal)
 {
 	return journal_force_commit(journal);
 }

 /* super.c */
 int ext4_force_commit(struct super_block *sb);

 static inline int ext4_should_journal_data(struct inode *inode)
 {
 	if (!S_ISREG(inode->i_mode))
 		return 1;
 	if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
 		return 1;
 	if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL)
 		return 1;
 	return 0;
 }

 static inline int ext4_should_order_data(struct inode *inode)
 {
 	if (!S_ISREG(inode->i_mode))
 		return 0;
 	if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL)
 		return 0;
 	if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
 		return 1;
 	return 0;
 }

 static inline int ext4_should_writeback_data(struct inode *inode)
 {
 	if (!S_ISREG(inode->i_mode))
 		return 0;
 	if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL)
 		return 0;
 	if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
 		return 1;
 	return 0;
 }

 #endif	/* _LINUX_EXT4_JBD_H */
	/*
	* linux/include/linux/ext4_jbd.h
	*
	* Written by Stephen C. Tweedie <sct@redhat.com>, 1999
	*
	* Copyright 1998--1999 Red Hat corp --- All Rights Reserved
	*
	* This file is part of the Linux kernel and is made available under
	* the terms of the GNU General Public License, version 2, or at your
	* option, any later version, incorporated herein by reference.
	*
	* Ext4-specific journaling extensions.
	*/

	#ifndef _LINUX_EXT4_JBD_H
	#define _LINUX_EXT4_JBD_H

	#include <linux/fs.h>
	#include <linux/jbd.h>
	#include <linux/ext4_fs.h>

	#define EXT4_JOURNAL(inode) (EXT4_SB((inode)->i_sb)->s_journal)

	/* Define the number of blocks we need to account to a transaction to
	* modify one block of data.
	*
	* We may have to touch one inode, one bitmap buffer, up to three
	* indirection blocks, the group and superblock summaries, and the data
	* block to complete the transaction. */

	#define EXT4_SINGLEDATA_TRANS_BLOCKS 8U

	/* Extended attribute operations touch at most two data buffers,
	* two bitmap buffers, and two group summaries, in addition to the inode
	* and the superblock, which are already accounted for. */

	#define EXT4_XATTR_TRANS_BLOCKS 6U

	/* Define the minimum size for a transaction which modifies data. This
	* needs to take into account the fact that we may end up modifying two
	* quota files too (one for the group, one for the user quota). The
	* superblock only gets updated once, of course, so don't bother
	* counting that again for the quota updates. */

	#define EXT4_DATA_TRANS_BLOCKS(sb) (EXT4_SINGLEDATA_TRANS_BLOCKS + \
	EXT4_XATTR_TRANS_BLOCKS - 2 + \
	2*EXT4_QUOTA_TRANS_BLOCKS(sb))

	/* Delete operations potentially hit one directory's namespace plus an
	* entire inode, plus arbitrary amounts of bitmap/indirection data. Be
	* generous. We can grow the delete transaction later if necessary. */

	#define EXT4_DELETE_TRANS_BLOCKS(sb) (2 * EXT4_DATA_TRANS_BLOCKS(sb) + 64)

	/* Define an arbitrary limit for the amount of data we will anticipate
	* writing to any given transaction. For unbounded transactions such as
	* write(2) and truncate(2) we can write more than this, but we always
	* start off at the maximum transaction size and grow the transaction
	* optimistically as we go. */

	#define EXT4_MAX_TRANS_DATA 64U

	/* We break up a large truncate or write transaction once the handle's
	* buffer credits gets this low, we need either to extend the
	* transaction or to start a new one. Reserve enough space here for
	* inode, bitmap, superblock, group and indirection updates for at least
	* one block, plus two quota updates. Quota allocations are not
	* needed. */

	#define EXT4_RESERVE_TRANS_BLOCKS 12U

	#define EXT4_INDEX_EXTRA_TRANS_BLOCKS 8

	#ifdef CONFIG_QUOTA
	/* Amount of blocks needed for quota update - we know that the structure was
	* allocated so we need to update only inode+data */
	#define EXT4_QUOTA_TRANS_BLOCKS(sb) (test_opt(sb, QUOTA) ? 2 : 0)
	/* Amount of blocks needed for quota insert/delete - we do some block writes
	* but inode, sb and group updates are done only once */
	#define EXT4_QUOTA_INIT_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_INIT_ALLOC*\
	(EXT4_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_INIT_REWRITE) : 0)
	#define EXT4_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\
	(EXT4_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_DEL_REWRITE) : 0)
	#else
	#define EXT4_QUOTA_TRANS_BLOCKS(sb) 0
	#define EXT4_QUOTA_INIT_BLOCKS(sb) 0
	#define EXT4_QUOTA_DEL_BLOCKS(sb) 0
	#endif

	int
	ext4_mark_iloc_dirty(handle_t *handle,
	struct inode *inode,
	struct ext4_iloc *iloc);

	/*
	* On success, We end up with an outstanding reference count against
	* iloc->bh. This _must_ be cleaned up later.
	*/

	int ext4_reserve_inode_write(handle_t handle, struct inode inode,
	struct ext4_iloc *iloc);

	int ext4_mark_inode_dirty(handle_t handle, struct inode inode);

	/*
	* Wrapper functions with which ext4 calls into JBD. The intent here is
	* to allow these to be turned into appropriate stubs so ext4 can control
	* ext2 filesystems, so ext2+ext4 systems only nee one fs. This work hasn't
	* been done yet.
	*/

	void ext4_journal_abort_handle(const char caller, const char err_fn,
	struct buffer_head bh, handle_t handle, int err);

	static inline int
	__ext4_journal_get_undo_access(const char where, handle_t handle,
	struct buffer_head *bh)
	{
	int err = journal_get_undo_access(handle, bh);
	if (err)
	ext4_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
	return err;
	}

	static inline int
	__ext4_journal_get_write_access(const char where, handle_t handle,
	struct buffer_head *bh)
	{
	int err = journal_get_write_access(handle, bh);
	if (err)
	ext4_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
	return err;
	}

	static inline void
	ext4_journal_release_buffer(handle_t handle, struct buffer_head bh)
	{
	journal_release_buffer(handle, bh);
	}

	static inline int
	__ext4_journal_forget(const char where, handle_t handle, struct buffer_head *bh)
	{
	int err = journal_forget(handle, bh);
	if (err)
	ext4_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
	return err;
	}

	static inline int
	__ext4_journal_revoke(const char where, handle_t handle,
	unsigned long blocknr, struct buffer_head *bh)
	{
	int err = journal_revoke(handle, blocknr, bh);
	if (err)
	ext4_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
	return err;
	}

	static inline int
	__ext4_journal_get_create_access(const char *where,
	handle_t handle, struct buffer_head bh)
	{
	int err = journal_get_create_access(handle, bh);
	if (err)
	ext4_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
	return err;
	}

	static inline int
	__ext4_journal_dirty_metadata(const char *where,
	handle_t handle, struct buffer_head bh)
	{
	int err = journal_dirty_metadata(handle, bh);
	if (err)
	ext4_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
	return err;
	}


	#define ext4_journal_get_undo_access(handle, bh) \
	__ext4_journal_get_undo_access(__FUNCTION__, (handle), (bh))
	#define ext4_journal_get_write_access(handle, bh) \
	__ext4_journal_get_write_access(__FUNCTION__, (handle), (bh))
	#define ext4_journal_revoke(handle, blocknr, bh) \
	__ext4_journal_revoke(__FUNCTION__, (handle), (blocknr), (bh))
	#define ext4_journal_get_create_access(handle, bh) \
	__ext4_journal_get_create_access(__FUNCTION__, (handle), (bh))
	#define ext4_journal_dirty_metadata(handle, bh) \
	__ext4_journal_dirty_metadata(__FUNCTION__, (handle), (bh))
	#define ext4_journal_forget(handle, bh) \
	__ext4_journal_forget(__FUNCTION__, (handle), (bh))

	int ext4_journal_dirty_data(handle_t handle, struct buffer_head bh);

	handle_t ext4_journal_start_sb(struct super_block sb, int nblocks);
	int __ext4_journal_stop(const char where, handle_t handle);

	static inline handle_t ext4_journal_start(struct inode inode, int nblocks)
	{
	return ext4_journal_start_sb(inode->i_sb, nblocks);
	}

	#define ext4_journal_stop(handle) \
	__ext4_journal_stop(__FUNCTION__, (handle))

	static inline handle_t *ext4_journal_current_handle(void)
	{
	return journal_current_handle();
	}

	static inline int ext4_journal_extend(handle_t *handle, int nblocks)
	{
	return journal_extend(handle, nblocks);
	}

	static inline int ext4_journal_restart(handle_t *handle, int nblocks)
	{
	return journal_restart(handle, nblocks);
	}

	static inline int ext4_journal_blocks_per_page(struct inode *inode)
	{
	return journal_blocks_per_page(inode);
	}

	static inline int ext4_journal_force_commit(journal_t *journal)
	{
	return journal_force_commit(journal);
	}

	/* super.c */
	int ext4_force_commit(struct super_block *sb);

	static inline int ext4_should_journal_data(struct inode *inode)
	{
	if (!S_ISREG(inode->i_mode))
	return 1;
	if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
	return 1;
	if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL)
	return 1;
	return 0;
	}

	static inline int ext4_should_order_data(struct inode *inode)
	{
	if (!S_ISREG(inode->i_mode))
	return 0;
	if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL)
	return 0;
	if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
	return 1;
	return 0;
	}

	static inline int ext4_should_writeback_data(struct inode *inode)
	{
	if (!S_ISREG(inode->i_mode))
	return 0;
	if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL)
	return 0;
	if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
	return 1;
	return 0;
	}

	#endif /* _LINUX_EXT4_JBD_H */