patch-2.4.15 linux/include/linux/ext3_fs_i.h

• Lines: 79
• Date: Thu Nov 22 11:46:19 2001
• Orig file: v2.4.14/linux/include/linux/ext3_fs_i.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.14/linux/include/linux/ext3_fs_i.h linux/include/linux/ext3_fs_i.h
@@ -0,0 +1,78 @@
+/*
+ *  linux/include/linux/ext3_fs_i.h
+ *
+ * Copyright (C) 1992, 1993, 1994, 1995
+ * Remy Card (card@masi.ibp.fr)
+ * Laboratoire MASI - Institut Blaise Pascal
+ * Universite Pierre et Marie Curie (Paris VI)
+ *
+ *  from
+ *
+ *  linux/include/linux/minix_fs_i.h
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ */
+
+#ifndef _LINUX_EXT3_FS_I
+#define _LINUX_EXT3_FS_I
+
+#include <linux/rwsem.h>
+
+/*
+ * second extended file system inode data in memory
+ */
+struct ext3_inode_info {
+	__u32	i_data[15];
+	__u32	i_flags;
+#ifdef EXT3_FRAGMENTS
+	__u32	i_faddr;
+	__u8	i_frag_no;
+	__u8	i_frag_size;
+	__u16	unused;			/* formerly i_osync */
+#endif
+	__u32	i_file_acl;
+	__u32	i_dir_acl;
+	__u32	i_dtime;
+	__u32	i_block_group;
+	__u32	i_state;		/* Dynamic state flags for ext3 */
+	__u32	i_next_alloc_block;
+	__u32	i_next_alloc_goal;
+#ifdef EXT3_PREALLOCATE
+	__u32	i_prealloc_block;
+	__u32	i_prealloc_count;
+#endif
+	__u32	i_dir_start_lookup;
+	
+	struct list_head i_orphan;	/* unlinked but open inodes */
+
+	/*
+	 * i_disksize keeps track of what the inode size is ON DISK, not
+	 * in memory.  During truncate, i_size is set to the new size by
+	 * the VFS prior to calling ext3_truncate(), but the filesystem won't
+	 * set i_disksize to 0 until the truncate is actually under way.
+	 *
+	 * The intent is that i_disksize always represents the blocks which
+	 * are used by this file.  This allows recovery to restart truncate
+	 * on orphans if we crash during truncate.  We actually write i_disksize
+	 * into the on-disk inode when writing inodes out, instead of i_size.
+	 *
+	 * The only time when i_disksize and i_size may be different is when
+	 * a truncate is in progress.  The only things which change i_disksize
+	 * are ext3_get_block (growth) and ext3_truncate (shrinkth).
+	 */
+	loff_t	i_disksize;
+
+	/*
+	 * truncate_sem is for serialising ext3_truncate() against
+	 * ext3_getblock().  In the 2.4 ext2 design, great chunks of inode's
+	 * data tree are chopped off during truncate. We can't do that in
+	 * ext3 because whenever we perform intermediate commits during
+	 * truncate, the inode and all the metadata blocks *must* be in a
+	 * consistent state which allows truncation of the orphans to restart
+	 * during recovery.  Hence we must fix the get_block-vs-truncate race
+	 * by other means, so we have truncate_sem.
+	 */
+	struct rw_semaphore truncate_sem;
+};
+
+#endif	/* _LINUX_EXT3_FS_I */