1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | File: linux/ext2_ext_attr.h
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4 |
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5 | On-disk format of extended attributes for the ext2 filesystem.
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6 |
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7 | (C) 2000 Andreas Gruenbacher, <a.gruenbacher@computer.org>
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8 | */
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9 |
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10 | /* Magic value in attribute blocks */
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11 | #define EXT2_EXT_ATTR_MAGIC_v1 0xEA010000
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12 | #define EXT2_EXT_ATTR_MAGIC 0xEA020000
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13 |
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14 | /* Maximum number of references to one attribute block */
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15 | #define EXT2_EXT_ATTR_REFCOUNT_MAX 1024
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16 |
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17 | struct ext2_ext_attr_header {
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18 | __u32 h_magic; /* magic number for identification */
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19 | __u32 h_refcount; /* reference count */
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20 | __u32 h_blocks; /* number of disk blocks used */
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21 | __u32 h_hash; /* hash value of all attributes */
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22 | __u32 h_reserved[4]; /* zero right now */
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23 | };
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24 |
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25 | struct ext2_ext_attr_entry {
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26 | __u8 e_name_len; /* length of name */
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27 | __u8 e_name_index; /* attribute name index */
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28 | __u16 e_value_offs; /* offset in disk block of value */
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29 | __u32 e_value_block; /* disk block attribute is stored on (n/i) */
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30 | __u32 e_value_size; /* size of attribute value */
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31 | __u32 e_hash; /* hash value of name and value */
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32 | };
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33 |
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34 | #define EXT2_EXT_ATTR_PAD_BITS 2
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35 | #define EXT2_EXT_ATTR_PAD (1<<EXT2_EXT_ATTR_PAD_BITS)
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36 | #define EXT2_EXT_ATTR_ROUND (EXT2_EXT_ATTR_PAD-1)
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37 | #define EXT2_EXT_ATTR_LEN(name_len) \
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38 | (((name_len) + EXT2_EXT_ATTR_ROUND + \
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39 | sizeof(struct ext2_ext_attr_entry)) & ~EXT2_EXT_ATTR_ROUND)
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40 | #define EXT2_EXT_ATTR_NEXT(entry) \
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41 | ( (struct ext2_ext_attr_entry *)( \
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42 | (char *)(entry) + EXT2_EXT_ATTR_LEN((entry)->e_name_len)) )
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43 | #define EXT2_EXT_ATTR_SIZE(size) \
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44 | (((size) + EXT2_EXT_ATTR_ROUND) & ~EXT2_EXT_ATTR_ROUND)
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45 | #define EXT2_EXT_IS_LAST_ENTRY(entry) (*((__u32 *)(entry)) == 0UL)
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46 | #define EXT2_EXT_ATTR_NAME(entry) \
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47 | (((char *) (entry)) + sizeof(struct ext2_ext_attr_entry))
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48 | #define EXT2_XATTR_LEN(name_len) \
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49 | (((name_len) + EXT2_EXT_ATTR_ROUND + \
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50 | sizeof(struct ext2_xattr_entry)) & ~EXT2_EXT_ATTR_ROUND)
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51 | #define EXT2_XATTR_SIZE(size) \
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52 | (((size) + EXT2_EXT_ATTR_ROUND) & ~EXT2_EXT_ATTR_ROUND)
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53 |
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