https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: bcf876870b95592b52519ed4aafcf9d95999bc9c authored by Linus Torvalds on 02 August 2020, 21:21:45 UTC
Linux 5.8
Linux 5.8
Tip revision: bcf8768
xattr_id.c
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Squashfs - a compressed read only filesystem for Linux
*
* Copyright (c) 2010
* Phillip Lougher <phillip@squashfs.org.uk>
*
* xattr_id.c
*/
/*
* This file implements code to map the 32-bit xattr id stored in the inode
* into the on disk location of the xattr data.
*/
#include <linux/fs.h>
#include <linux/vfs.h>
#include <linux/slab.h>
#include "squashfs_fs.h"
#include "squashfs_fs_sb.h"
#include "squashfs.h"
#include "xattr.h"
/*
* Map xattr id using the xattr id look up table
*/
int squashfs_xattr_lookup(struct super_block *sb, unsigned int index,
int *count, unsigned int *size, unsigned long long *xattr)
{
struct squashfs_sb_info *msblk = sb->s_fs_info;
int block = SQUASHFS_XATTR_BLOCK(index);
int offset = SQUASHFS_XATTR_BLOCK_OFFSET(index);
u64 start_block = le64_to_cpu(msblk->xattr_id_table[block]);
struct squashfs_xattr_id id;
int err;
err = squashfs_read_metadata(sb, &id, &start_block, &offset,
sizeof(id));
if (err < 0)
return err;
*xattr = le64_to_cpu(id.xattr);
*size = le32_to_cpu(id.size);
*count = le32_to_cpu(id.count);
return 0;
}
/*
* Read uncompressed xattr id lookup table indexes from disk into memory
*/
__le64 *squashfs_read_xattr_id_table(struct super_block *sb, u64 start,
u64 *xattr_table_start, int *xattr_ids)
{
unsigned int len;
struct squashfs_xattr_id_table *id_table;
id_table = squashfs_read_table(sb, start, sizeof(*id_table));
if (IS_ERR(id_table))
return (__le64 *) id_table;
*xattr_table_start = le64_to_cpu(id_table->xattr_table_start);
*xattr_ids = le32_to_cpu(id_table->xattr_ids);
kfree(id_table);
/* Sanity check values */
/* there is always at least one xattr id */
if (*xattr_ids == 0)
return ERR_PTR(-EINVAL);
/* xattr_table should be less than start */
if (*xattr_table_start >= start)
return ERR_PTR(-EINVAL);
len = SQUASHFS_XATTR_BLOCK_BYTES(*xattr_ids);
TRACE("In read_xattr_index_table, length %d\n", len);
return squashfs_read_table(sb, start + sizeof(*id_table), len);
}