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