fs/gfs2/xattr.h

0001 /* SPDX-License-Identifier: GPL-2.0-only */
0002 /*
0003  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
0004  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
0005  */
0006
0007 #ifndef __EATTR_DOT_H__
0008 #define __EATTR_DOT_H__
0009
0010 struct gfs2_inode;
0011 struct iattr;
0012
0013 #define GFS2_EA_REC_LEN(ea) be32_to_cpu((ea)->ea_rec_len)
0014 #define GFS2_EA_DATA_LEN(ea) be32_to_cpu((ea)->ea_data_len)
0015
0016 #define GFS2_EA_SIZE(ea) \
0017 ALIGN(sizeof(struct gfs2_ea_header) + (ea)->ea_name_len + \
0018       ((GFS2_EA_IS_STUFFED(ea)) ? GFS2_EA_DATA_LEN(ea) : \
0019                   (sizeof(__be64) * (ea)->ea_num_ptrs)), 8)
0020
0021 #define GFS2_EA_IS_STUFFED(ea) (!(ea)->ea_num_ptrs)
0022 #define GFS2_EA_IS_LAST(ea) ((ea)->ea_flags & GFS2_EAFLAG_LAST)
0023
0024 #define GFS2_EAREQ_SIZE_STUFFED(er) \
0025 ALIGN(sizeof(struct gfs2_ea_header) + (er)->er_name_len + (er)->er_data_len, 8)
0026
0027 #define GFS2_EA2NAME(ea) ((char *)((struct gfs2_ea_header *)(ea) + 1))
0028 #define GFS2_EA2DATA(ea) (GFS2_EA2NAME(ea) + (ea)->ea_name_len)
0029
0030 #define GFS2_EA2DATAPTRS(ea) \
0031 ((__be64 *)(GFS2_EA2NAME(ea) + ALIGN((ea)->ea_name_len, 8)))
0032
0033 #define GFS2_EA2NEXT(ea) \
0034 ((struct gfs2_ea_header *)((char *)(ea) + GFS2_EA_REC_LEN(ea)))
0035
0036 #define GFS2_EA_BH2FIRST(bh) \
0037 ((struct gfs2_ea_header *)((bh)->b_data + sizeof(struct gfs2_meta_header)))
0038
0039 struct gfs2_ea_request {
0040     const char *er_name;
0041     char *er_data;
0042     unsigned int er_name_len;
0043     unsigned int er_data_len;
0044     unsigned int er_type; /* GFS2_EATYPE_... */
0045 };
0046
0047 struct gfs2_ea_location {
0048     struct buffer_head *el_bh;
0049     struct gfs2_ea_header *el_ea;
0050     struct gfs2_ea_header *el_prev;
0051 };
0052
0053 extern int __gfs2_xattr_set(struct inode *inode, const char *name,
0054                 const void *value, size_t size,
0055                 int flags, int type);
0056 extern ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size);
0057 extern int gfs2_ea_dealloc(struct gfs2_inode *ip);
0058
0059 /* Exported to acl.c */
0060
0061 extern int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **data);
0062
0063 #endif /* __EATTR_DOT_H__ */