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/*

 * linux/include/linux/ext4_jbd2.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_JBD2_H

#define _LINUX_EXT4_JBD2_H

#include <linux/fs.h>

#include <linux/jbd2.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.

 *

 * For extents-enabled fs we may have to allocate and modify up to

 * 5 levels of tree + root which are stored in the inode. */

#define EXT4_SINGLEDATA_TRANS_BLOCKS(sb)                                \

        (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)   \

                || test_opt(sb, EXTENTS) ? 27U : 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(sb) + \

                                         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(sb)-3)+3+DQUOT_INIT_REWRITE) : 0)

#define EXT4_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\

                (EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-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.

 */

static inline void ext4_journal_release_buffer(handle_t *handle,

                                                struct buffer_head *bh)

{

        jbd2_journal_release_buffer(handle, bh);

}

void ext4_journal_abort_handle(const char *caller, const char *err_fn,

                struct buffer_head *bh, handle_t *handle, int err);

int __ext4_journal_get_undo_access(const char *where, handle_t *handle,

                                struct buffer_head *bh);

int __ext4_journal_get_write_access(const char *where, handle_t *handle,

                                struct buffer_head *bh);

int __ext4_journal_forget(const char *where, handle_t *handle,

                                struct buffer_head *bh);

int __ext4_journal_revoke(const char *where, handle_t *handle,

                                ext4_fsblk_t blocknr, struct buffer_head *bh);

int __ext4_journal_get_create_access(const char *where,

                                handle_t *handle, struct buffer_head *bh);

int __ext4_journal_dirty_metadata(const char *where,

                                handle_t *handle, struct buffer_head *bh);

#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 jbd2_journal_extend(handle, nblocks);

}

static inline int ext4_journal_restart(handle_t *handle, int nblocks)

{

        return jbd2_journal_restart(handle, nblocks);

}

static inline int ext4_journal_blocks_per_page(struct inode *inode)

{

        return jbd2_journal_blocks_per_page(inode);

}

static inline int ext4_journal_force_commit(journal_t *journal)

{

        return jbd2_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_JBD2_H */