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206 lines
6.2 KiB
C
206 lines
6.2 KiB
C
/*
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* Copyright (c) 2015 Grzegorz Kostka (kostka.grzegorz@gmail.com)
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* Copyright (c) 2015 Kaho Ng (ngkaho1234@gmail.com)
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* - The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/** @addtogroup lwext4
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* @{
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*/
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/**
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* @file ext4_xattr.h
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* @brief Extended Attribute manipulation.
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*/
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#ifndef EXT4_XATTR_H_
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#define EXT4_XATTR_H_
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#include <ext2fs.h>
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#include <linux/rbtree.h>
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/* Extended Attribute(EA) */
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/* Magic value in attribute blocks */
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#define EXT4_XATTR_MAGIC 0xEA020000
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/* Maximum number of references to one attribute block */
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#define EXT4_XATTR_REFCOUNT_MAX 1024
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/* Name indexes */
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#define EXT4_XATTR_INDEX_USER 1
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#define EXT4_XATTR_INDEX_POSIX_ACL_ACCESS 2
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#define EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT 3
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#define EXT4_XATTR_INDEX_TRUSTED 4
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#define EXT4_XATTR_INDEX_LUSTRE 5
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#define EXT4_XATTR_INDEX_SECURITY 6
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#define EXT4_XATTR_INDEX_SYSTEM 7
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#define EXT4_XATTR_INDEX_RICHACL 8
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#define EXT4_XATTR_INDEX_ENCRYPTION 9
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#pragma pack(push, 1)
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struct ext4_xattr_header {
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__le32 h_magic; /* magic number for identification */
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__le32 h_refcount; /* reference count */
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__le32 h_blocks; /* number of disk blocks used */
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__le32 h_hash; /* hash value of all attributes */
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__le32 h_checksum; /* crc32c(uuid+id+xattrblock) */
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/* id = inum if refcount=1, blknum otherwise */
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__le32 h_reserved[3]; /* zero right now */
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};
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struct ext4_xattr_ibody_header {
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__le32 h_magic; /* magic number for identification */
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};
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struct ext4_xattr_entry {
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__u8 e_name_len; /* length of name */
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__u8 e_name_index; /* attribute name index */
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__le16 e_value_offs; /* offset in disk block of value */
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__le32 e_value_block; /* disk block attribute is stored on (n/i) */
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__le32 e_value_size; /* size of attribute value */
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__le32 e_hash; /* hash value of name and value */
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};
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#pragma pack(pop)
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#define EXT4_GOOD_OLD_INODE_SIZE EXT2_GOOD_OLD_INODE_SIZE
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#define EXT4_XATTR_PAD_BITS 2
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#define EXT4_XATTR_PAD (1<<EXT4_XATTR_PAD_BITS)
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#define EXT4_XATTR_ROUND (EXT4_XATTR_PAD-1)
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#define EXT4_XATTR_LEN(name_len) \
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(((name_len) + EXT4_XATTR_ROUND + \
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sizeof(struct ext4_xattr_entry)) & ~EXT4_XATTR_ROUND)
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#define EXT4_XATTR_NEXT(entry) \
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((struct ext4_xattr_entry *)( \
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(char *)(entry) + EXT4_XATTR_LEN((entry)->e_name_len)))
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#define EXT4_XATTR_SIZE(size) \
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(((size) + EXT4_XATTR_ROUND) & ~EXT4_XATTR_ROUND)
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#define EXT4_XATTR_NAME(entry) \
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((char *)((entry) + 1))
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#define EXT4_XATTR_IHDR(raw_inode) \
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((struct ext4_xattr_ibody_header *) \
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((char *)raw_inode + \
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EXT4_GOOD_OLD_INODE_SIZE + \
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(raw_inode)->i_extra_isize))
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#define EXT4_XATTR_IFIRST(hdr) \
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((struct ext4_xattr_entry *)((hdr)+1))
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#define EXT4_XATTR_BHDR(block) \
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((struct ext4_xattr_header *)((block)->b_data))
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#define EXT4_XATTR_ENTRY(ptr) \
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((struct ext4_xattr_entry *)(ptr))
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#define EXT4_XATTR_BFIRST(block) \
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EXT4_XATTR_ENTRY(EXT4_XATTR_BHDR(block)+1)
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#define EXT4_XATTR_IS_LAST_ENTRY(entry) \
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(*(__le32 *)(entry) == 0)
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#define EXT4_ZERO_XATTR_VALUE ((void *)-1)
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struct ext4_xattr_item {
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/* This attribute should be stored in inode body */
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BOOL in_inode;
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BOOL is_data;
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__u8 name_index;
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char *name;
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size_t name_len;
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void *data;
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size_t data_size;
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struct rb_node node;
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struct list_head list_node;
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};
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struct ext4_xattr_ref {
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PEXT2_IRP_CONTEXT IrpContext;
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BOOL block_loaded;
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struct buffer_head *block_bh;
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PEXT2_MCB inode_ref;
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PEXT2_INODE OnDiskInode;
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BOOL IsOnDiskInodeDirty;
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BOOL dirty;
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size_t ea_size;
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size_t inode_size_rem;
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size_t block_size_rem;
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PEXT2_VCB fs;
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void *iter_arg;
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struct ext4_xattr_item *iter_from;
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struct rb_root root;
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struct list_head ordered_list;
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};
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#define EXT4_XATTR_ITERATE_CONT 0
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#define EXT4_XATTR_ITERATE_STOP 1
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#define EXT4_XATTR_ITERATE_PAUSE 2
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int ext4_fs_get_xattr_ref(PEXT2_IRP_CONTEXT IrpContext, PEXT2_VCB fs, PEXT2_MCB inode_ref,
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struct ext4_xattr_ref *ref);
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int ext4_fs_put_xattr_ref(struct ext4_xattr_ref *ref);
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int ext4_fs_set_xattr(struct ext4_xattr_ref *ref, __u8 name_index,
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const char *name, size_t name_len, const void *data,
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size_t data_size, BOOL replace);
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int ext4_fs_set_xattr_ordered(struct ext4_xattr_ref *ref, __u8 name_index,
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const char *name, size_t name_len, const void *data,
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size_t data_size);
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int ext4_fs_remove_xattr(struct ext4_xattr_ref *ref, __u8 name_index,
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const char *name, size_t name_len);
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int ext4_fs_get_xattr(struct ext4_xattr_ref *ref, __u8 name_index,
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const char *name, size_t name_len, void *buf,
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size_t buf_size, size_t *data_size);
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void ext4_fs_xattr_iterate(struct ext4_xattr_ref *ref,
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int(*iter)(struct ext4_xattr_ref *ref,
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struct ext4_xattr_item *item,
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BOOL is_last));
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void ext4_fs_xattr_iterate_reset(struct ext4_xattr_ref *ref);
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const char *ext4_extract_xattr_name(const char *full_name, size_t full_name_len,
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__u8 *name_index, size_t *name_len,
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BOOL *found);
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const char *ext4_get_xattr_name_prefix(__u8 name_index,
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size_t *ret_prefix_len);
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void ext4_xattr_purge_items(struct ext4_xattr_ref *xattr_ref);
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#endif
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/**
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* @}
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*/
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