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166 lines
5.2 KiB
166 lines
5.2 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* fs/f2fs/xattr.h |
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* |
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* Copyright (c) 2012 Samsung Electronics Co., Ltd. |
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* http://www.samsung.com/ |
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* |
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* Portions of this code from linux/fs/ext2/xattr.h |
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* |
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* On-disk format of extended attributes for the ext2 filesystem. |
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* |
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* (C) 2001 Andreas Gruenbacher, <[email protected]> |
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*/ |
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#ifndef __F2FS_XATTR_H__ |
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#define __F2FS_XATTR_H__ |
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#include <linux/init.h> |
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#include <linux/xattr.h> |
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/* Magic value in attribute blocks */ |
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#define F2FS_XATTR_MAGIC 0xF2F52011 |
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/* Maximum number of references to one attribute block */ |
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#define F2FS_XATTR_REFCOUNT_MAX 1024 |
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/* Name indexes */ |
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#define F2FS_SYSTEM_ADVISE_NAME "system.advise" |
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#define F2FS_XATTR_INDEX_USER 1 |
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#define F2FS_XATTR_INDEX_POSIX_ACL_ACCESS 2 |
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#define F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT 3 |
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#define F2FS_XATTR_INDEX_TRUSTED 4 |
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#define F2FS_XATTR_INDEX_LUSTRE 5 |
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#define F2FS_XATTR_INDEX_SECURITY 6 |
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#define F2FS_XATTR_INDEX_ADVISE 7 |
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/* Should be same as EXT4_XATTR_INDEX_ENCRYPTION */ |
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#define F2FS_XATTR_INDEX_ENCRYPTION 9 |
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#define F2FS_XATTR_INDEX_VERITY 11 |
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#define F2FS_XATTR_NAME_ENCRYPTION_CONTEXT "c" |
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#define F2FS_XATTR_NAME_VERITY "v" |
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struct f2fs_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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__u32 h_reserved[4]; /* zero right now */ |
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}; |
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struct f2fs_xattr_entry { |
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__u8 e_name_index; |
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__u8 e_name_len; |
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__le16 e_value_size; /* size of attribute value */ |
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char e_name[]; /* attribute name */ |
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}; |
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#define XATTR_HDR(ptr) ((struct f2fs_xattr_header *)(ptr)) |
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#define XATTR_ENTRY(ptr) ((struct f2fs_xattr_entry *)(ptr)) |
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#define XATTR_FIRST_ENTRY(ptr) (XATTR_ENTRY(XATTR_HDR(ptr) + 1)) |
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#define XATTR_ROUND (3) |
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#define XATTR_ALIGN(size) (((size) + XATTR_ROUND) & ~XATTR_ROUND) |
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#define ENTRY_SIZE(entry) (XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + \ |
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(entry)->e_name_len + le16_to_cpu((entry)->e_value_size))) |
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#define XATTR_NEXT_ENTRY(entry) ((struct f2fs_xattr_entry *)((char *)(entry) +\ |
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ENTRY_SIZE(entry))) |
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#define IS_XATTR_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0) |
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#define list_for_each_xattr(entry, addr) \ |
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for (entry = XATTR_FIRST_ENTRY(addr);\ |
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!IS_XATTR_LAST_ENTRY(entry);\ |
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entry = XATTR_NEXT_ENTRY(entry)) |
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#define VALID_XATTR_BLOCK_SIZE (PAGE_SIZE - sizeof(struct node_footer)) |
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#define XATTR_PADDING_SIZE (sizeof(__u32)) |
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#define XATTR_SIZE(i) ((F2FS_I(i)->i_xattr_nid ? \ |
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VALID_XATTR_BLOCK_SIZE : 0) + \ |
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(inline_xattr_size(i))) |
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#define MIN_OFFSET(i) XATTR_ALIGN(inline_xattr_size(i) + \ |
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VALID_XATTR_BLOCK_SIZE) |
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#define MAX_VALUE_LEN(i) (MIN_OFFSET(i) - \ |
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sizeof(struct f2fs_xattr_header) - \ |
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sizeof(struct f2fs_xattr_entry)) |
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#define MAX_INLINE_XATTR_SIZE \ |
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(DEF_ADDRS_PER_INODE - \ |
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F2FS_TOTAL_EXTRA_ATTR_SIZE / sizeof(__le32) - \ |
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DEF_INLINE_RESERVED_SIZE - \ |
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MIN_INLINE_DENTRY_SIZE / sizeof(__le32)) |
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/* |
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* On-disk structure of f2fs_xattr |
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* We use inline xattrs space + 1 block for xattr. |
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* |
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* +--------------------+ |
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* | f2fs_xattr_header | |
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* | | |
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* +--------------------+ |
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* | f2fs_xattr_entry | |
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* | .e_name_index = 1 | |
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* | .e_name_len = 3 | |
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* | .e_value_size = 14 | |
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* | .e_name = "foo" | |
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* | "value_of_xattr" |<- value_offs = e_name + e_name_len |
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* +--------------------+ |
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* | f2fs_xattr_entry | |
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* | .e_name_index = 4 | |
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* | .e_name = "bar" | |
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* +--------------------+ |
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* | | |
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* | Free | |
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* | | |
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* +--------------------+<- MIN_OFFSET |
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* | node_footer | |
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* | (nid, ino, offset) | |
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* +--------------------+ |
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* |
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**/ |
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#ifdef CONFIG_F2FS_FS_XATTR |
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extern const struct xattr_handler f2fs_xattr_user_handler; |
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extern const struct xattr_handler f2fs_xattr_trusted_handler; |
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extern const struct xattr_handler f2fs_xattr_advise_handler; |
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extern const struct xattr_handler f2fs_xattr_security_handler; |
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extern const struct xattr_handler *f2fs_xattr_handlers[]; |
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extern int f2fs_setxattr(struct inode *, int, const char *, |
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const void *, size_t, struct page *, int); |
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extern int f2fs_getxattr(struct inode *, int, const char *, void *, |
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size_t, struct page *); |
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extern ssize_t f2fs_listxattr(struct dentry *, char *, size_t); |
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extern int f2fs_init_xattr_caches(struct f2fs_sb_info *); |
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extern void f2fs_destroy_xattr_caches(struct f2fs_sb_info *); |
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#else |
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#define f2fs_xattr_handlers NULL |
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#define f2fs_listxattr NULL |
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static inline int f2fs_setxattr(struct inode *inode, int index, |
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const char *name, const void *value, size_t size, |
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struct page *page, int flags) |
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{ |
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return -EOPNOTSUPP; |
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} |
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static inline int f2fs_getxattr(struct inode *inode, int index, |
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const char *name, void *buffer, |
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size_t buffer_size, struct page *dpage) |
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{ |
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return -EOPNOTSUPP; |
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} |
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static inline int f2fs_init_xattr_caches(struct f2fs_sb_info *sbi) { return 0; } |
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static inline void f2fs_destroy_xattr_caches(struct f2fs_sb_info *sbi) { } |
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#endif |
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#ifdef CONFIG_F2FS_FS_SECURITY |
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extern int f2fs_init_security(struct inode *, struct inode *, |
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const struct qstr *, struct page *); |
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#else |
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static inline int f2fs_init_security(struct inode *inode, struct inode *dir, |
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const struct qstr *qstr, struct page *ipage) |
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{ |
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return 0; |
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} |
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#endif |
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#endif /* __F2FS_XATTR_H__ */
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