mirror of https://gitee.com/openkylin/linux.git
97 lines
3.3 KiB
C
97 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (c) 2000,2002-2003,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*/
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#ifndef __XFS_ATTR_H__
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#define __XFS_ATTR_H__
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struct xfs_inode;
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struct xfs_da_args;
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struct xfs_attr_list_context;
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/*
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* Large attribute lists are structured around Btrees where all the data
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* elements are in the leaf nodes. Attribute names are hashed into an int,
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* then that int is used as the index into the Btree. Since the hashval
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* of an attribute name may not be unique, we may have duplicate keys.
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* The internal links in the Btree are logical block offsets into the file.
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*
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* Small attribute lists use a different format and are packed as tightly
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* as possible so as to fit into the literal area of the inode.
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*/
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/*
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* The maximum size (into the kernel or returned from the kernel) of an
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* attribute value or the buffer used for an attr_list() call. Larger
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* sizes will result in an ERANGE return code.
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*/
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#define ATTR_MAX_VALUELEN (64*1024) /* max length of a value */
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/*
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* Kernel-internal version of the attrlist cursor.
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*/
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struct xfs_attrlist_cursor_kern {
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__u32 hashval; /* hash value of next entry to add */
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__u32 blkno; /* block containing entry (suggestion) */
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__u32 offset; /* offset in list of equal-hashvals */
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__u16 pad1; /* padding to match user-level */
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__u8 pad2; /* padding to match user-level */
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__u8 initted; /* T/F: cursor has been initialized */
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};
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/*========================================================================
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* Structure used to pass context around among the routines.
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*========================================================================*/
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/* void; state communicated via *context */
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typedef void (*put_listent_func_t)(struct xfs_attr_list_context *, int,
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unsigned char *, int, int);
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struct xfs_attr_list_context {
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struct xfs_trans *tp;
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struct xfs_inode *dp; /* inode */
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struct xfs_attrlist_cursor_kern cursor; /* position in list */
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void *buffer; /* output buffer */
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/*
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* Abort attribute list iteration if non-zero. Can be used to pass
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* error values to the xfs_attr_list caller.
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*/
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int seen_enough;
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bool allow_incomplete;
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ssize_t count; /* num used entries */
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int dupcnt; /* count dup hashvals seen */
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int bufsize; /* total buffer size */
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int firstu; /* first used byte in buffer */
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unsigned int attr_filter; /* XFS_ATTR_{ROOT,SECURE} */
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int resynch; /* T/F: resynch with cursor */
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put_listent_func_t put_listent; /* list output fmt function */
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int index; /* index into output buffer */
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};
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/*========================================================================
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* Function prototypes for the kernel.
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*========================================================================*/
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/*
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* Overall external interface routines.
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*/
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int xfs_attr_inactive(struct xfs_inode *dp);
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int xfs_attr_list_ilocked(struct xfs_attr_list_context *);
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int xfs_attr_list(struct xfs_attr_list_context *);
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int xfs_inode_hasattr(struct xfs_inode *ip);
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int xfs_attr_get_ilocked(struct xfs_da_args *args);
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int xfs_attr_get(struct xfs_da_args *args);
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int xfs_attr_set(struct xfs_da_args *args);
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int xfs_attr_set_args(struct xfs_da_args *args);
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int xfs_has_attr(struct xfs_da_args *args);
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int xfs_attr_remove_args(struct xfs_da_args *args);
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bool xfs_attr_namecheck(const void *name, size_t length);
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#endif /* __XFS_ATTR_H__ */
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