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0a8165d7c2
As pointed out by Randy Dunlap, this patch removes all usage of "/**" for comment blocks. Instead, just use "/*". Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
146 lines
4.3 KiB
C
146 lines
4.3 KiB
C
/*
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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, <a.gruenbacher@computer.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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_PREFIX "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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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[0]; /* 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 MIN_OFFSET XATTR_ALIGN(PAGE_SIZE - \
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sizeof(struct node_footer) - \
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sizeof(__u32))
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#define MAX_VALUE_LEN (MIN_OFFSET - sizeof(struct f2fs_xattr_header) - \
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sizeof(struct f2fs_xattr_entry))
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/*
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* On-disk structure of f2fs_xattr
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* We use only 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_acl_access_handler;
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extern const struct xattr_handler f2fs_xattr_acl_default_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_handlers[];
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extern int f2fs_setxattr(struct inode *inode, int name_index, const char *name,
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const void *value, size_t value_len);
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extern int f2fs_getxattr(struct inode *inode, int name_index, const char *name,
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void *buffer, size_t buffer_size);
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extern ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer,
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size_t buffer_size);
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#else
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#define f2fs_xattr_handlers NULL
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static inline int f2fs_setxattr(struct inode *inode, int name_index,
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const char *name, const void *value, size_t value_len)
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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 name_index,
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const char *name, void *buffer, size_t buffer_size)
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{
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return -EOPNOTSUPP;
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}
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static inline ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer,
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size_t buffer_size)
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{
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return -EOPNOTSUPP;
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}
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#endif
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#endif /* __F2FS_XATTR_H__ */
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