ext3-wantedi-2.6-suse.patch

非常经典的一个分布式系统

diff -urp linux-2.6.5-7.282.orig/fs/ext3/ialloc.c linux-2.6.5-7.282/fs/ext3/ialloc.c
--- linux-2.6.5-7.282.orig/fs/ext3/ialloc.c	2006-08-30 17:12:13.000000000 +0300
+++ linux-2.6.5-7.282/fs/ext3/ialloc.c	2007-02-16 07:43:08.000000000 +0200
@@ -420,7 +420,8 @@ static int find_group_other(struct super
  * For other inodes, search forward from the parent directory's block
  * group to find a free inode.
  */
-struct inode *ext3_new_inode(handle_t *handle, struct inode * dir, int mode)
+struct inode *ext3_new_inode(handle_t *handle, struct inode * dir, int mode,
+				unsigned long goal)
 {
 	struct super_block *sb;
 	struct buffer_head *bitmap_bh = NULL;
@@ -448,6 +449,41 @@ struct inode *ext3_new_inode(handle_t *h
 
 	sbi = EXT3_SB(sb);
 	es = sbi->s_es;
+	if (goal) {
+		group = (goal - 1) / EXT3_INODES_PER_GROUP(sb);
+		ino = (goal - 1) % EXT3_INODES_PER_GROUP(sb);
+		err = -EIO;
+
+		gdp = ext3_get_group_desc(sb, group, &bh2);
+		if (!gdp)
+			goto fail;
+
+		bitmap_bh = read_inode_bitmap (sb, group);
+		if (!bitmap_bh)
+			goto fail;
+
+		BUFFER_TRACE(bh, "get_write_access");
+		err = ext3_journal_get_write_access(handle, bitmap_bh);
+		if (err) goto fail;
+
+		if (ext3_set_bit_atomic(sb_bgl_lock(sbi, group),
+					ino, bitmap_bh->b_data)) {
+			printk(KERN_ERR "goal inode %lu unavailable\n", goal);
+			/* Oh well, we tried. */
+			goto continue_allocation;
+		}
+
+		BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata");
+		err = ext3_journal_dirty_metadata(handle, bitmap_bh);
+		if (err) goto fail;
+
+		/* We've shortcircuited the allocation system successfully,
+		 * now finish filling in the inode.
+		 */
+		goto got;
+	}
+
+continue_allocation:
 	if (S_ISDIR(mode)) {
 		if (test_opt (sb, OLDALLOC))
 			group = find_group_dir(sb, dir);
diff -urp linux-2.6.5-7.282.orig/fs/ext3/ioctl.c linux-2.6.5-7.282/fs/ext3/ioctl.c
--- linux-2.6.5-7.282.orig/fs/ext3/ioctl.c	2006-08-30 17:12:13.000000000 +0300
+++ linux-2.6.5-7.282/fs/ext3/ioctl.c	2007-02-16 07:43:08.000000000 +0200
@@ -25,6 +25,31 @@ int ext3_ioctl (struct inode * inode, st
 	ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg);
 
 	switch (cmd) {
+	case EXT3_IOC_CREATE_INUM: {
+		char name[32];
+		struct dentry *dchild, *dparent;
+		int rc = 0;
+
+		dparent = list_entry(inode->i_dentry.next, struct dentry,
+				     d_alias);
+		snprintf(name, sizeof name, "%lu", arg);
+		dchild = lookup_one_len(name, dparent, strlen(name));
+		if (dchild->d_inode) {
+			printk(KERN_ERR "%*s/%lu already exists (ino %lu)\n",
+			       dparent->d_name.len, dparent->d_name.name, arg,
+			       dchild->d_inode->i_ino);
+			rc = -EEXIST;
+		} else {
+			dchild->d_fsdata = (void *)arg;
+			rc = vfs_create(inode, dchild, 0644, NULL);
+			if (rc)
+				printk(KERN_ERR "vfs_create: %d\n", rc);
+			else if (dchild->d_inode->i_ino != arg)
+				rc = -EEXIST;
+		}
+		dput(dchild);
+		return rc;
+	}
 	case EXT3_IOC_GETFLAGS:
 		flags = ei->i_flags & EXT3_FL_USER_VISIBLE;
 		return put_user(flags, (int *) arg);
diff -urp linux-2.6.5-7.282.orig/fs/ext3/namei.c linux-2.6.5-7.282/fs/ext3/namei.c
--- linux-2.6.5-7.282.orig/fs/ext3/namei.c	2006-08-30 17:12:34.000000000 +0300
+++ linux-2.6.5-7.282/fs/ext3/namei.c	2007-02-16 07:46:13.000000000 +0200
@@ -144,6 +144,14 @@ struct dx_map_entry
 	u32 offs;
 };
 
+#define LVFS_DENTRY_PARAM_MAGIC		20070216UL
+struct lvfs_dentry_params
+{
+	unsigned long   p_inum;
+	void            *p_ptr;	
+	u32		magic;
+};
+
 #ifdef CONFIG_EXT3_INDEX
 static inline unsigned dx_get_block (struct dx_entry *entry);
 static void dx_set_block (struct dx_entry *entry, unsigned value);
@@ -1625,6 +1633,20 @@ static int ext3_add_nondir(handle_t *han
 	return err;
 }
 
+static struct inode * ext3_new_inode_wantedi(handle_t *handle, struct inode *dir,
+						int mode, struct dentry *dentry)
+{
+	unsigned long inum = 0;
+
+	if (dentry->d_fsdata != NULL) {
+		struct lvfs_dentry_params *param = dentry->d_fsdata;
+
+		if (param->magic == LVFS_DENTRY_PARAM_MAGIC)
+			inum = param->p_inum;
+	}
+	return ext3_new_inode(handle, dir, mode, inum);
+}
+
 /*
  * By the time this is called, we already have created
  * the directory cache entry for the new file, but it
@@ -1649,7 +1671,7 @@ retry:
 	if (IS_DIRSYNC(dir))
 		handle->h_sync = 1;
 
-	inode = ext3_new_inode (handle, dir, mode);
+	inode = ext3_new_inode_wantedi (handle, dir, mode, dentry);
 	err = PTR_ERR(inode);
 	if (!IS_ERR(inode)) {
 		inode->i_op = &ext3_file_inode_operations;
@@ -1682,7 +1704,7 @@ retry:
 	if (IS_DIRSYNC(dir))
 		handle->h_sync = 1;
 
-	inode = ext3_new_inode (handle, dir, mode);
+	inode = ext3_new_inode_wantedi (handle, dir, mode, dentry);
 	err = PTR_ERR(inode);
 	if (!IS_ERR(inode)) {
 		init_special_inode(inode, inode->i_mode, rdev);
@@ -1718,7 +1740,7 @@ retry:
 	if (IS_DIRSYNC(dir))
 		handle->h_sync = 1;
 
-	inode = ext3_new_inode (handle, dir, S_IFDIR | mode);
+	inode = ext3_new_inode_wantedi (handle, dir, S_IFDIR | mode, dentry);
 	err = PTR_ERR(inode);
 	if (IS_ERR(inode))
 		goto out_stop;
@@ -2113,7 +2135,7 @@ retry:
 	if (IS_DIRSYNC(dir))
 		handle->h_sync = 1;
 
-	inode = ext3_new_inode (handle, dir, S_IFLNK|S_IRWXUGO);
+	inode = ext3_new_inode_wantedi (handle, dir, S_IFLNK|S_IRWXUGO, dentry);
 	err = PTR_ERR(inode);
 	if (IS_ERR(inode))
 		goto out_stop;
diff -urp linux-2.6.5-7.282.orig/include/linux/ext3_fs.h linux-2.6.5-7.282/include/linux/ext3_fs.h
--- linux-2.6.5-7.282.orig/include/linux/ext3_fs.h	2006-08-30 17:12:13.000000000 +0300
+++ linux-2.6.5-7.282/include/linux/ext3_fs.h	2007-02-16 07:43:08.000000000 +0200
@@ -203,6 +203,7 @@ struct ext3_group_desc
 #define	EXT3_IOC_SETFLAGS		_IOW('f', 2, long)
 #define	EXT3_IOC_GETVERSION		_IOR('f', 3, long)
 #define	EXT3_IOC_SETVERSION		_IOW('f', 4, long)
+/* EXT3_IOC_CREATE_INUM at bottom of file (visible to kernel and user). */
 #define	EXT3_IOC_GETVERSION_OLD		_IOR('v', 1, long)
 #define	EXT3_IOC_SETVERSION_OLD		_IOW('v', 2, long)
 #ifdef CONFIG_JBD_DEBUG
@@ -712,7 +713,8 @@ extern int ext3fs_dirhash(const char *na
 			  dx_hash_info *hinfo);
 
 /* ialloc.c */
-extern struct inode * ext3_new_inode (handle_t *, struct inode *, int);
+extern struct inode * ext3_new_inode (handle_t *, struct inode *, int,
+				      unsigned long);
 extern void ext3_free_inode (handle_t *, struct inode *);
 extern struct inode * ext3_orphan_get (struct super_block *, unsigned long);
 extern unsigned long ext3_count_free_inodes (struct super_block *);
@@ -797,4 +799,5 @@ extern struct inode_operations ext3_fast
 
 #endif	/* __KERNEL__ */
 
+#define EXT3_IOC_CREATE_INUM			_IOW('f', 5, long)
 #endif	/* _LINUX_EXT3_FS_H */