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This patch adds support for mapping xattr ids (stored in inodes) into the on-disk location of the xattrs themselves. Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
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Phillip Lougher
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May 17, 2010
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| /* | ||
| * Squashfs - a compressed read only filesystem for Linux | ||
| * | ||
| * Copyright (c) 2010 | ||
| * Phillip Lougher <phillip@lougher.demon.co.uk> | ||
| * | ||
| * This program is free software; you can redistribute it and/or | ||
| * modify it under the terms of the GNU General Public License | ||
| * as published by the Free Software Foundation; either version 2, | ||
| * or (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program; if not, write to the Free Software | ||
| * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | ||
| * | ||
| * 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_fs_i.h" | ||
| #include "squashfs.h" | ||
|
|
||
| /* | ||
| * Map xattr id using the xattr id look up table | ||
| */ | ||
| int squashfs_xattr_lookup(struct super_block *sb, unsigned int index, | ||
| int *count, int *size, 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; | ||
|
|
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| err = squashfs_read_metadata(sb, &id, &start_block, &offset, | ||
| sizeof(id)); | ||
| if (err < 0) | ||
| return err; | ||
|
|
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| *xattr = le64_to_cpu(id.xattr); | ||
| *size = le32_to_cpu(id.size); | ||
| *count = le32_to_cpu(id.count); | ||
| return 0; | ||
| } | ||
|
|
||
|
|
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| /* | ||
| * 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; | ||
| __le64 *xid_table; | ||
| struct squashfs_xattr_id_table id_table; | ||
| int err; | ||
|
|
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| err = squashfs_read_table(sb, &id_table, start, sizeof(id_table)); | ||
| if (err < 0) { | ||
| ERROR("unable to read xattr id table\n"); | ||
| return ERR_PTR(err); | ||
| } | ||
| *xattr_table_start = le64_to_cpu(id_table.xattr_table_start); | ||
| *xattr_ids = le32_to_cpu(id_table.xattr_ids); | ||
| len = SQUASHFS_XATTR_BLOCK_BYTES(*xattr_ids); | ||
|
|
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| TRACE("In read_xattr_index_table, length %d\n", len); | ||
|
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| /* Allocate xattr id lookup table indexes */ | ||
| xid_table = kmalloc(len, GFP_KERNEL); | ||
| if (xid_table == NULL) { | ||
| ERROR("Failed to allocate xattr id index table\n"); | ||
| return ERR_PTR(-ENOMEM); | ||
| } | ||
|
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| err = squashfs_read_table(sb, xid_table, start + sizeof(id_table), len); | ||
| if (err < 0) { | ||
| ERROR("unable to read xattr id index table\n"); | ||
| kfree(xid_table); | ||
| return ERR_PTR(err); | ||
| } | ||
|
|
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| return xid_table; | ||
| } |