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/*

 * linux/include/linux/ext3_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.

 *

 * Ext3-specific journaling extensions.

 */

#ifndef _LINUX_EXT3_JBD_H

#define _LINUX_EXT3_JBD_H

#include <linux/fs.h>

#include <linux/jbd.h>

#include <linux/ext3_fs.h>

#define EXT3_JOURNAL(inode)     (EXT3_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 EXT3_SINGLEDATA_TRANS_BLOCKS    8U

/* 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 EXT3_DATA_TRANS_BLOCKS          (3 * EXT3_SINGLEDATA_TRANS_BLOCKS - 2)

extern int ext3_writepage_trans_blocks(struct inode *inode);

/* 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 EXT3_DELETE_TRANS_BLOCKS        (2 * EXT3_DATA_TRANS_BLOCKS + 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 EXT3_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 EXT3_RESERVE_TRANS_BLOCKS       12U

int

ext3_mark_iloc_dirty(handle_t *handle,

                     struct inode *inode,

                     struct ext3_iloc *iloc);

/*

 * On success, We end up with an outstanding reference count against

 * iloc->bh.  This _must_ be cleaned up later.

 */

int ext3_reserve_inode_write(handle_t *handle, struct inode *inode,

                        struct ext3_iloc *iloc);

int ext3_mark_inode_dirty(handle_t *handle, struct inode *inode);

/*

 * Wrapper functions with which ext3 calls into JBD.  The intent here is

 * to allow these to be turned into appropriate stubs so ext3 can control

 * ext2 filesystems, so ext2+ext3 systems only nee one fs.  This work hasn't

 * been done yet.

 */

static inline void ext3_journal_abort_handle(const char *caller,

                                             const char *err_fn,

                                             struct buffer_head *bh,

                                             handle_t *handle,

                                             int err)

{

        char nbuf[16];

        const char *errstr = ext3_decode_error(NULL, err, nbuf);

        printk(KERN_ERR "%s: aborting transaction: %s in %s",

               caller, errstr, err_fn);

        if (bh)

                BUFFER_TRACE(bh, "abort");

        journal_abort_handle(handle);

        if (!handle->h_err)

                handle->h_err = err;

}

static inline int

__ext3_journal_get_undo_access(const char *where,

                               handle_t *handle, struct buffer_head *bh)

{

        int err = journal_get_undo_access(handle, bh);

        if (err)

                ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);

        return err;

}

static inline int

__ext3_journal_get_write_access(const char *where,

                                handle_t *handle, struct buffer_head *bh)

{

        int err = journal_get_write_access(handle, bh);

        if (err)

                ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);

        return err;

}

static inline int

__ext3_journal_dirty_data(const char *where,

                          handle_t *handle, struct buffer_head *bh, int async)

{

        int err = journal_dirty_data(handle, bh, async);

        if (err)

                ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);

        return err;

}

static inline void

ext3_journal_forget(handle_t *handle, struct buffer_head *bh)

{

        journal_forget(handle, bh);

}

static inline int

__ext3_journal_revoke(const char *where, handle_t *handle,

                      unsigned long blocknr, struct buffer_head *bh)

{

        int err = journal_revoke(handle, blocknr, bh);

        if (err)

                ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);

        return err;

}

static inline int

__ext3_journal_get_create_access(const char *where,

                                 handle_t *handle, struct buffer_head *bh)

{

        int err = journal_get_create_access(handle, bh);

        if (err)

                ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);

        return err;

}

static inline int

__ext3_journal_dirty_metadata(const char *where,

                              handle_t *handle, struct buffer_head *bh)

{

        int err = journal_dirty_metadata(handle, bh);

        if (err)

                ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);

        return err;

}

#define ext3_journal_get_undo_access(handle, bh) \

        __ext3_journal_get_undo_access(__FUNCTION__, (handle), (bh))

#define ext3_journal_get_write_access(handle, bh) \

        __ext3_journal_get_write_access(__FUNCTION__, (handle), (bh))

#define ext3_journal_dirty_data(handle, bh, async) \

        __ext3_journal_dirty_data(__FUNCTION__, (handle), (bh), (async))

#define ext3_journal_revoke(handle, blocknr, bh) \

        __ext3_journal_revoke(__FUNCTION__, (handle), (blocknr), (bh))

#define ext3_journal_get_create_access(handle, bh) \

        __ext3_journal_get_create_access(__FUNCTION__, (handle), (bh))

#define ext3_journal_dirty_metadata(handle, bh) \

        __ext3_journal_dirty_metadata(__FUNCTION__, (handle), (bh))

/*

 * Wrappers for journal_start/end.

 *

 * The only special thing we need to do here is to make sure that all

 * journal_end calls result in the superblock being marked dirty, so

 * that sync() will call the filesystem's write_super callback if

 * appropriate.

 */

static inline handle_t *ext3_journal_start(struct inode *inode, int nblocks)

{

        journal_t *journal;

        if (inode->i_sb->s_flags & MS_RDONLY)

                return ERR_PTR(-EROFS);

        /* Special case here: if the journal has aborted behind our

         * backs (eg. EIO in the commit thread), then we still need to

         * take the FS itself readonly cleanly. */

        journal = EXT3_JOURNAL(inode);

        if (is_journal_aborted(journal)) {

                ext3_abort(inode->i_sb, __FUNCTION__,

                           "Detected aborted journal");

                return ERR_PTR(-EROFS);

        }

        return journal_start(journal, nblocks);

}

static inline handle_t *

ext3_journal_try_start(struct inode *inode, int nblocks)

{

        if (inode->i_sb->s_flags & MS_RDONLY)

                return ERR_PTR(-EROFS);

        return journal_try_start(EXT3_JOURNAL(inode), nblocks);

}

/*

 * The only special thing we need to do here is to make sure that all

 * journal_stop calls result in the superblock being marked dirty, so

 * that sync() will call the filesystem's write_super callback if

 * appropriate.

 */

static inline int __ext3_journal_stop(const char *where,

                                      handle_t *handle, struct inode *inode)

{

        int err = handle->h_err;

        int rc = journal_stop(handle);

        inode->i_sb->s_dirt = 1;

        if (!err)

                err = rc;

        if (err)

                __ext3_std_error(inode->i_sb, where, err);

        return err;

}

#define ext3_journal_stop(handle, inode) \

        __ext3_journal_stop(__FUNCTION__, (handle), (inode))

static inline handle_t *ext3_journal_current_handle(void)

{

        return journal_current_handle();

}

static inline void

ext3_log_start_commit(journal_t *journal, transaction_t *transaction)

{

        log_start_commit(journal, transaction);

}

static inline void ext3_log_wait_commit(journal_t *journal, tid_t tid)

{

        log_wait_commit(journal, tid);

}

static inline int ext3_journal_extend(handle_t *handle, int nblocks)

{

        return journal_extend(handle, nblocks);

}

static inline int ext3_journal_restart(handle_t *handle, int nblocks)

{

        return journal_restart(handle, nblocks);

}

static inline int ext3_journal_blocks_per_page(struct inode *inode)

{

        return journal_blocks_per_page(inode);

}

static inline int ext3_journal_force_commit(journal_t *journal)

{

        return journal_force_commit(journal);

}

/* super.c */

int ext3_force_commit(struct super_block *sb);

static inline int ext3_should_journal_data(struct inode *inode)

{

        if (!S_ISREG(inode->i_mode))

                return 1;

        if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)

                return 1;

        if (inode->u.ext3_i.i_flags & EXT3_JOURNAL_DATA_FL)

                return 1;

        return 0;

}

static inline int ext3_should_order_data(struct inode *inode)

{

        return (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA);

}

#endif  /* _LINUX_EXT3_JBD_H */