2 * linux/include/linux/ext3_fs_i.h
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
11 * linux/include/linux/minix_fs_i.h
13 * Copyright (C) 1991, 1992 Linus Torvalds
16 #ifndef _LINUX_EXT3_FS_I
17 #define _LINUX_EXT3_FS_I
19 #include <linux/rwsem.h>
22 * second extended file system inode data in memory
24 struct ext3_inode_info {
31 __u16 unused; /* formerly i_osync */
37 __u32 i_state; /* Dynamic state flags for ext3 */
38 __u32 i_next_alloc_block;
39 __u32 i_next_alloc_goal;
40 #ifdef EXT3_PREALLOCATE
41 __u32 i_prealloc_block;
42 __u32 i_prealloc_count;
44 __u32 i_dir_start_lookup;
46 struct list_head i_orphan; /* unlinked but open inodes */
49 * i_disksize keeps track of what the inode size is ON DISK, not
50 * in memory. During truncate, i_size is set to the new size by
51 * the VFS prior to calling ext3_truncate(), but the filesystem won't
52 * set i_disksize to 0 until the truncate is actually under way.
54 * The intent is that i_disksize always represents the blocks which
55 * are used by this file. This allows recovery to restart truncate
56 * on orphans if we crash during truncate. We actually write i_disksize
57 * into the on-disk inode when writing inodes out, instead of i_size.
59 * The only time when i_disksize and i_size may be different is when
60 * a truncate is in progress. The only things which change i_disksize
61 * are ext3_get_block (growth) and ext3_truncate (shrinkth).
66 * truncate_sem is for serialising ext3_truncate() against
67 * ext3_getblock(). In the 2.4 ext2 design, great chunks of inode's
68 * data tree are chopped off during truncate. We can't do that in
69 * ext3 because whenever we perform intermediate commits during
70 * truncate, the inode and all the metadata blocks *must* be in a
71 * consistent state which allows truncation of the orphans to restart
72 * during recovery. Hence we must fix the get_block-vs-truncate race
73 * by other means, so we have truncate_sem.
75 struct rw_semaphore truncate_sem;
78 #endif /* _LINUX_EXT3_FS_I */