patch-2.4.15 linux/include/linux/ext3_jbd.h

• Lines: 291
• Date: Fri Nov 9 14:25:04 2001
• Orig file: v2.4.14/linux/include/linux/ext3_jbd.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.14/linux/include/linux/ext3_jbd.h linux/include/linux/ext3_jbd.h
@@ -0,0 +1,290 @@
+/*
+ * 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	8
+
+/* 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		64
+
+/* 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	12
+
+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)
+{
+	if (inode->i_sb->s_flags & MS_RDONLY)
+		return ERR_PTR(-EROFS);
+	return journal_start(EXT3_JOURNAL(inode), 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 */