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Linux/fs/squashfs/xattr_id.c

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  1 /*
  2  * Squashfs - a compressed read only filesystem for Linux
  3  *
  4  * Copyright (c) 2010
  5  * Phillip Lougher <phillip@squashfs.org.uk>
  6  *
  7  * This program is free software; you can redistribute it and/or
  8  * modify it under the terms of the GNU General Public License
  9  * as published by the Free Software Foundation; either version 2,
 10  * or (at your option) any later version.
 11  *
 12  * This program is distributed in the hope that it will be useful,
 13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15  * GNU General Public License for more details.
 16  *
 17  * You should have received a copy of the GNU General Public License
 18  * along with this program; if not, write to the Free Software
 19  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 20  *
 21  * xattr_id.c
 22  */
 23 
 24 /*
 25  * This file implements code to map the 32-bit xattr id stored in the inode
 26  * into the on disk location of the xattr data.
 27  */
 28 
 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  * Map xattr id using the xattr id look up table
 40  */
 41 int 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  * Read uncompressed xattr id lookup table indexes from disk into memory
 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         /* Sanity check values */
 81 
 82         /* there is always at least one xattr id */
 83         if (*xattr_ids == 0)
 84                 return ERR_PTR(-EINVAL);
 85 
 86         /* xattr_table should be less than start */
 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 

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