mirror of
https://git.openwrt.org/project/make_ext4fs.git
synced 2024-11-08 22:06:33 -05:00
89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/****************************************************************************
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****************************************************************************
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***
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*** This header was automatically generated from a Linux kernel header
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*** of the same name, to make information necessary for userspace to
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*** call into the kernel available to libc. It contains only constants,
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*** structures, and macros generated from the original header, and thus,
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*** contains no copyrightable information.
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***
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****************************************************************************
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****************************************************************************/
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#ifndef _EXT4_EXTENTS
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#define _EXT4_EXTENTS
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#include "ext4.h"
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#define AGGRESSIVE_TEST_
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#define EXTENTS_STATS__
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#define CHECK_BINSEARCH__
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#define EXT_DEBUG__
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#ifdef EXT_DEBUG
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#define ext_debug(a...) printk(a)
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#else
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#define ext_debug(a...)
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#endif
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#define EXT_STATS_
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struct ext4_extent {
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__le32 ee_block;
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__le16 ee_len;
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__le16 ee_start_hi;
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__le32 ee_start_lo;
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};
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struct ext4_extent_idx {
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__le32 ei_block;
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__le32 ei_leaf_lo;
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__le16 ei_leaf_hi;
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__u16 ei_unused;
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};
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struct ext4_extent_header {
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__le16 eh_magic;
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__le16 eh_entries;
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__le16 eh_max;
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__le16 eh_depth;
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__le32 eh_generation;
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};
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#define EXT4_EXT_MAGIC 0xf30a
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struct ext4_ext_path {
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ext4_fsblk_t p_block;
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__u16 p_depth;
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struct ext4_extent *p_ext;
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struct ext4_extent_idx *p_idx;
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struct ext4_extent_header *p_hdr;
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struct buffer_head *p_bh;
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};
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#define EXT4_EXT_CACHE_NO 0
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#define EXT4_EXT_CACHE_GAP 1
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#define EXT4_EXT_CACHE_EXTENT 2
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#define EXT_CONTINUE 0
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#define EXT_BREAK 1
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#define EXT_REPEAT 2
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#define EXT_MAX_BLOCK 0xffffffff
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#define EXT_INIT_MAX_LEN (1UL << 15)
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#define EXT_UNINIT_MAX_LEN (EXT_INIT_MAX_LEN - 1)
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#define EXT_FIRST_EXTENT(__hdr__) ((struct ext4_extent *) (((char *) (__hdr__)) + sizeof(struct ext4_extent_header)))
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#define EXT_FIRST_INDEX(__hdr__) ((struct ext4_extent_idx *) (((char *) (__hdr__)) + sizeof(struct ext4_extent_header)))
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#define EXT_HAS_FREE_INDEX(__path__) (le16_to_cpu((__path__)->p_hdr->eh_entries) < le16_to_cpu((__path__)->p_hdr->eh_max))
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#define EXT_LAST_EXTENT(__hdr__) (EXT_FIRST_EXTENT((__hdr__)) + le16_to_cpu((__hdr__)->eh_entries) - 1)
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#define EXT_LAST_INDEX(__hdr__) (EXT_FIRST_INDEX((__hdr__)) + le16_to_cpu((__hdr__)->eh_entries) - 1)
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#define EXT_MAX_EXTENT(__hdr__) (EXT_FIRST_EXTENT((__hdr__)) + le16_to_cpu((__hdr__)->eh_max) - 1)
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#define EXT_MAX_INDEX(__hdr__) (EXT_FIRST_INDEX((__hdr__)) + le16_to_cpu((__hdr__)->eh_max) - 1)
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#endif
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