This source file includes following definitions.
- squashfs_frag_lookup
- squashfs_read_fragment_index_table
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23 #include <linux/fs.h>
24 #include <linux/vfs.h>
25 #include <linux/slab.h>
26
27 #include "squashfs_fs.h"
28 #include "squashfs_fs_sb.h"
29 #include "squashfs.h"
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35 int squashfs_frag_lookup(struct super_block *sb, unsigned int fragment,
36 u64 *fragment_block)
37 {
38 struct squashfs_sb_info *msblk = sb->s_fs_info;
39 int block, offset, size;
40 struct squashfs_fragment_entry fragment_entry;
41 u64 start_block;
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43 if (fragment >= msblk->fragments)
44 return -EIO;
45 block = SQUASHFS_FRAGMENT_INDEX(fragment);
46 offset = SQUASHFS_FRAGMENT_INDEX_OFFSET(fragment);
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48 start_block = le64_to_cpu(msblk->fragment_index[block]);
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50 size = squashfs_read_metadata(sb, &fragment_entry, &start_block,
51 &offset, sizeof(fragment_entry));
52 if (size < 0)
53 return size;
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55 *fragment_block = le64_to_cpu(fragment_entry.start_block);
56 return squashfs_block_size(fragment_entry.size);
57 }
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63 __le64 *squashfs_read_fragment_index_table(struct super_block *sb,
64 u64 fragment_table_start, u64 next_table, unsigned int fragments)
65 {
66 unsigned int length = SQUASHFS_FRAGMENT_INDEX_BYTES(fragments);
67 __le64 *table;
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74 if (fragment_table_start + length > next_table)
75 return ERR_PTR(-EINVAL);
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77 table = squashfs_read_table(sb, fragment_table_start, length);
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83 if (!IS_ERR(table) && le64_to_cpu(table[0]) >= fragment_table_start) {
84 kfree(table);
85 return ERR_PTR(-EINVAL);
86 }
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88 return table;
89 }