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29#include <linux/fs.h>
30#include <linux/vfs.h>
31#include <linux/slab.h>
32
33#include "squashfs_fs.h"
34#include "squashfs_fs_sb.h"
35#include "squashfs.h"
36#include "xattr.h"
37
38
39
40
41int squashfs_xattr_lookup(struct super_block *sb, unsigned int index,
42 int *count, unsigned int *size, unsigned long long *xattr)
43{
44 struct squashfs_sb_info *msblk = sb->s_fs_info;
45 int block = SQUASHFS_XATTR_BLOCK(index);
46 int offset = SQUASHFS_XATTR_BLOCK_OFFSET(index);
47 u64 start_block = le64_to_cpu(msblk->xattr_id_table[block]);
48 struct squashfs_xattr_id id;
49 int err;
50
51 err = squashfs_read_metadata(sb, &id, &start_block, &offset,
52 sizeof(id));
53 if (err < 0)
54 return err;
55
56 *xattr = le64_to_cpu(id.xattr);
57 *size = le32_to_cpu(id.size);
58 *count = le32_to_cpu(id.count);
59 return 0;
60}
61
62
63
64
65
66__le64 *squashfs_read_xattr_id_table(struct super_block *sb, u64 start,
67 u64 *xattr_table_start, int *xattr_ids)
68{
69 unsigned int len;
70 struct squashfs_xattr_id_table *id_table;
71
72 id_table = squashfs_read_table(sb, start, sizeof(*id_table));
73 if (IS_ERR(id_table))
74 return (__le64 *) id_table;
75
76 *xattr_table_start = le64_to_cpu(id_table->xattr_table_start);
77 *xattr_ids = le32_to_cpu(id_table->xattr_ids);
78 kfree(id_table);
79
80
81
82
83 if (*xattr_ids == 0)
84 return ERR_PTR(-EINVAL);
85
86
87 if (*xattr_table_start >= start)
88 return ERR_PTR(-EINVAL);
89
90 len = SQUASHFS_XATTR_BLOCK_BYTES(*xattr_ids);
91
92 TRACE("In read_xattr_index_table, length %d\n", len);
93
94 return squashfs_read_table(sb, start + sizeof(*id_table), len);
95}
96