xref: /openbmc/linux/fs/gfs2/xattr.h (revision d312fbf6)
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
4  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
5  */
6 
7 #ifndef __EATTR_DOT_H__
8 #define __EATTR_DOT_H__
9 
10 struct gfs2_inode;
11 struct iattr;
12 
13 #define GFS2_EA_REC_LEN(ea) be32_to_cpu((ea)->ea_rec_len)
14 #define GFS2_EA_DATA_LEN(ea) be32_to_cpu((ea)->ea_data_len)
15 
16 #define GFS2_EA_SIZE(ea) \
17 ALIGN(sizeof(struct gfs2_ea_header) + (ea)->ea_name_len + \
18       ((GFS2_EA_IS_STUFFED(ea)) ? GFS2_EA_DATA_LEN(ea) : \
19 				  (sizeof(__be64) * (ea)->ea_num_ptrs)), 8)
20 
21 #define GFS2_EA_IS_STUFFED(ea) (!(ea)->ea_num_ptrs)
22 #define GFS2_EA_IS_LAST(ea) ((ea)->ea_flags & GFS2_EAFLAG_LAST)
23 
24 #define GFS2_EAREQ_SIZE_STUFFED(er) \
25 ALIGN(sizeof(struct gfs2_ea_header) + (er)->er_name_len + (er)->er_data_len, 8)
26 
27 #define GFS2_EA2NAME(ea) ((char *)((struct gfs2_ea_header *)(ea) + 1))
28 #define GFS2_EA2DATA(ea) (GFS2_EA2NAME(ea) + (ea)->ea_name_len)
29 
30 #define GFS2_EA2DATAPTRS(ea) \
31 ((__be64 *)(GFS2_EA2NAME(ea) + ALIGN((ea)->ea_name_len, 8)))
32 
33 #define GFS2_EA2NEXT(ea) \
34 ((struct gfs2_ea_header *)((char *)(ea) + GFS2_EA_REC_LEN(ea)))
35 
36 #define GFS2_EA_BH2FIRST(bh) \
37 ((struct gfs2_ea_header *)((bh)->b_data + sizeof(struct gfs2_meta_header)))
38 
39 struct gfs2_ea_request {
40 	const char *er_name;
41 	char *er_data;
42 	unsigned int er_name_len;
43 	unsigned int er_data_len;
44 	unsigned int er_type; /* GFS2_EATYPE_... */
45 };
46 
47 struct gfs2_ea_location {
48 	struct buffer_head *el_bh;
49 	struct gfs2_ea_header *el_ea;
50 	struct gfs2_ea_header *el_prev;
51 };
52 
53 int __gfs2_xattr_set(struct inode *inode, const char *name,
54 		     const void *value, size_t size,
55 		     int flags, int type);
56 ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size);
57 int gfs2_ea_dealloc(struct gfs2_inode *ip);
58 
59 /* Exported to acl.c */
60 
61 int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **data);
62 
63 #endif /* __EATTR_DOT_H__ */
64