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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | /* |
| 2 | * linux/include/linux/ext3_fs_i.h |
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| 3 | * |
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| 4 | * Copyright (C) 1992, 1993, 1994, 1995 |
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| 5 | * Remy Card (card@masi.ibp.fr) |
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| 6 | * Laboratoire MASI - Institut Blaise Pascal |
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| 7 | * Universite Pierre et Marie Curie (Paris VI) |
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| 8 | * |
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| 9 | * from |
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| 10 | * |
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| 11 | * linux/include/linux/minix_fs_i.h |
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| 12 | * |
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| 13 | * Copyright (C) 1991, 1992 Linus Torvalds |
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| 14 | */ |
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| 15 | |||
| 16 | #ifndef _LINUX_EXT3_FS_I |
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| 17 | #define _LINUX_EXT3_FS_I |
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| 18 | |||
| 19 | #include <linux/rwsem.h> |
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| 20 | |||
| 21 | /* |
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| 22 | * second extended file system inode data in memory |
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| 23 | */ |
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| 24 | struct ext3_inode_info { |
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| 25 | __u32 i_data[15]; |
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| 26 | __u32 i_flags; |
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| 27 | #ifdef EXT3_FRAGMENTS |
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| 28 | __u32 i_faddr; |
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| 29 | __u8 i_frag_no; |
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| 30 | __u8 i_frag_size; |
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| 31 | #endif |
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| 32 | __u32 i_file_acl; |
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| 33 | __u32 i_dir_acl; |
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| 34 | __u32 i_dtime; |
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| 35 | |||
| 36 | /* |
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| 37 | * i_block_group is the number of the block group which contains |
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| 38 | * this file's inode. Constant across the lifetime of the inode, |
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| 39 | * it is ued for making block allocation decisions - we try to |
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| 40 | * place a file's data blocks near its inode block, and new inodes |
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| 41 | * near to their parent directory's inode. |
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| 42 | */ |
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| 43 | __u32 i_block_group; |
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| 44 | __u32 i_state; /* Dynamic state flags for ext3 */ |
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| 45 | |||
| 46 | /* |
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| 47 | * i_next_alloc_block is the logical (file-relative) number of the |
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| 48 | * most-recently-allocated block in this file. Yes, it is misnamed. |
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| 49 | * We use this for detecting linearly ascending allocation requests. |
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| 50 | */ |
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| 51 | __u32 i_next_alloc_block; |
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| 52 | |||
| 53 | /* |
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| 54 | * i_next_alloc_goal is the *physical* companion to i_next_alloc_block. |
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| 55 | * it the the physical block number of the block which was most-recently |
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| 56 | * allocated to this file. This give us the goal (target) for the next |
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| 57 | * allocation when we detect linearly ascending requests. |
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| 58 | */ |
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| 59 | __u32 i_next_alloc_goal; |
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| 60 | #ifdef EXT3_PREALLOCATE |
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| 61 | __u32 i_prealloc_block; |
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| 62 | __u32 i_prealloc_count; |
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| 63 | #endif |
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| 64 | __u32 i_dir_start_lookup; |
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| 65 | #ifdef CONFIG_EXT3_FS_XATTR |
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| 66 | /* |
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| 67 | * Extended attributes can be read independently of the main file |
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| 68 | * data. Taking i_sem even when reading would cause contention |
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| 69 | * between readers of EAs and writers of regular file data, so |
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| 70 | * instead we synchronize on xattr_sem when reading or changing |
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| 71 | * EAs. |
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| 72 | */ |
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| 73 | struct rw_semaphore xattr_sem; |
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| 74 | #endif |
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| 75 | #ifdef CONFIG_EXT3_FS_POSIX_ACL |
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| 76 | struct posix_acl *i_acl; |
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| 77 | struct posix_acl *i_default_acl; |
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| 78 | #endif |
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| 79 | |||
| 80 | struct list_head i_orphan; /* unlinked but open inodes */ |
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| 81 | |||
| 82 | /* |
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| 83 | * i_disksize keeps track of what the inode size is ON DISK, not |
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| 84 | * in memory. During truncate, i_size is set to the new size by |
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| 85 | * the VFS prior to calling ext3_truncate(), but the filesystem won't |
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| 86 | * set i_disksize to 0 until the truncate is actually under way. |
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| 87 | * |
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| 88 | * The intent is that i_disksize always represents the blocks which |
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| 89 | * are used by this file. This allows recovery to restart truncate |
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| 90 | * on orphans if we crash during truncate. We actually write i_disksize |
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| 91 | * into the on-disk inode when writing inodes out, instead of i_size. |
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| 92 | * |
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| 93 | * The only time when i_disksize and i_size may be different is when |
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| 94 | * a truncate is in progress. The only things which change i_disksize |
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| 95 | * are ext3_get_block (growth) and ext3_truncate (shrinkth). |
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| 96 | */ |
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| 97 | loff_t i_disksize; |
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| 98 | |||
| 99 | /* |
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| 100 | * truncate_sem is for serialising ext3_truncate() against |
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| 101 | * ext3_getblock(). In the 2.4 ext2 design, great chunks of inode's |
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| 102 | * data tree are chopped off during truncate. We can't do that in |
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| 103 | * ext3 because whenever we perform intermediate commits during |
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| 104 | * truncate, the inode and all the metadata blocks *must* be in a |
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| 105 | * consistent state which allows truncation of the orphans to restart |
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| 106 | * during recovery. Hence we must fix the get_block-vs-truncate race |
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| 107 | * by other means, so we have truncate_sem. |
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| 108 | */ |
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| 109 | struct semaphore truncate_sem; |
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| 110 | struct inode vfs_inode; |
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| 111 | }; |
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| 112 | |||
| 113 | #endif /* _LINUX_EXT3_FS_I */ |