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