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/*
File: linux/reiserfs_xattr.h
*/
#ifndef _LINUX_REISERFS_XATTR_H
#define _LINUX_REISERFS_XATTR_H
#include <linux/types.h>
/* Magic value in header */
#define REISERFS_XATTR_MAGIC 0x52465841 /* "RFXA" */
struct reiserfs_xattr_header {
__le32 h_magic; /* magic number for identification */
__le32 h_hash; /* hash of the value */
};
#ifdef __KERNEL__
#include <linux/init.h>
#include <linux/list.h>
#include <linux/rwsem.h>
#include <linux/reiserfs_fs_i.h>
#include <linux/reiserfs_fs.h>
struct inode;
struct dentry;
struct iattr;
struct super_block;
struct nameidata;
int reiserfs_xattr_register_handlers(void) __init;
void reiserfs_xattr_unregister_handlers(void);
int reiserfs_xattr_init(struct super_block *sb, int mount_flags);
int reiserfs_delete_xattrs(struct inode *inode);
int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs);
#ifdef CONFIG_REISERFS_FS_XATTR
#define has_xattr_dir(inode) (REISERFS_I(inode)->i_flags & i_has_xattr_dir)
ssize_t reiserfs_getxattr(struct dentry *dentry, const char *name,
void *buffer, size_t size);
int reiserfs_setxattr(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags);
ssize_t reiserfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
int reiserfs_removexattr(struct dentry *dentry, const char *name);
int reiserfs_permission(struct inode *inode, int mask);
int reiserfs_xattr_get(struct inode *, const char *, void *, size_t);
int reiserfs_xattr_set(struct inode *, const char *, const void *, size_t, int);
int reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *,
struct inode *, const char *, const void *,
size_t, int);
extern struct xattr_handler reiserfs_xattr_user_handler;
extern struct xattr_handler reiserfs_xattr_trusted_handler;
extern struct xattr_handler reiserfs_xattr_security_handler;
#define xattr_size(size) ((size) + sizeof(struct reiserfs_xattr_header))
static inline loff_t reiserfs_xattr_nblocks(struct inode *inode, loff_t size)
{
loff_t ret = 0;
if (reiserfs_file_data_log(inode)) {
ret = _ROUND_UP(xattr_size(size), inode->i_sb->s_blocksize);
ret >>= inode->i_sb->s_blocksize_bits;
}
return ret;
}
/* We may have to create up to 3 objects: xattr root, xattr dir, xattr file.
* Let's try to be smart about it.
* xattr root: We cache it. If it's not cached, we may need to create it.
* xattr dir: If anything has been loaded for this inode, we can set a flag
* saying so.
* xattr file: Since we don't cache xattrs, we can't tell. We always include
* blocks for it.
*
* However, since root and dir can be created between calls - YOU MUST SAVE
* THIS VALUE.
*/
static inline size_t reiserfs_xattr_jcreate_nblocks(struct inode *inode)
{
size_t nblocks = JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
if ((REISERFS_I(inode)->i_flags & i_has_xattr_dir) == 0) {
nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
if (REISERFS_SB(inode->i_sb)->xattr_root == NULL)
nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
}
return nblocks;
}
static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
{
init_rwsem(&REISERFS_I(inode)->i_xattr_sem);
}
#else
#define reiserfs_getxattr NULL
#define reiserfs_setxattr NULL
#define reiserfs_listxattr NULL
#define reiserfs_removexattr NULL
#define reiserfs_permission NULL
static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
{
}
#endif /* CONFIG_REISERFS_FS_XATTR */
#endif /* __KERNEL__ */
#endif /* _LINUX_REISERFS_XATTR_H */
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