1/*
  2 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
  3 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
  4 *
  5 * This copyrighted material is made available to anyone wishing to use,
  6 * modify, copy, or redistribute it subject to the terms and conditions
  7 * of the GNU General Public License version 2.
  8 */
  9
 10#ifndef __INODE_DOT_H__
 11#define __INODE_DOT_H__
 12
 13#include <linux/fs.h>
 14#include <linux/buffer_head.h>
 15#include <linux/mm.h>
 16#include "util.h"
 17
 18extern int gfs2_releasepage(struct page *page, gfp_t gfp_mask);
 19extern int gfs2_internal_read(struct gfs2_inode *ip,
 20			      char *buf, loff_t *pos, unsigned size);
 21extern void gfs2_set_aops(struct inode *inode);
 22
 23static inline int gfs2_is_stuffed(const struct gfs2_inode *ip)
 24{
 25	return !ip->i_height;
 26}
 27
 28static inline int gfs2_is_jdata(const struct gfs2_inode *ip)
 29{
 30	return ip->i_diskflags & GFS2_DIF_JDATA;
 31}
 32
 33static inline int gfs2_is_writeback(const struct gfs2_inode *ip)
 34{
 35	const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 36	return (sdp->sd_args.ar_data == GFS2_DATA_WRITEBACK) && !gfs2_is_jdata(ip);
 37}
 38
 39static inline int gfs2_is_ordered(const struct gfs2_inode *ip)
 40{
 41	const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 42	return (sdp->sd_args.ar_data == GFS2_DATA_ORDERED) && !gfs2_is_jdata(ip);
 43}
 44
 45static inline int gfs2_is_dir(const struct gfs2_inode *ip)
 46{
 47	return S_ISDIR(ip->i_inode.i_mode);
 48}
 49
 50static inline void gfs2_set_inode_blocks(struct inode *inode, u64 blocks)
 51{
 52	inode->i_blocks = blocks <<
 53		(GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
 54}
 55
 56static inline u64 gfs2_get_inode_blocks(const struct inode *inode)
 57{
 58	return inode->i_blocks >>
 59		(GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
 60}
 61
 62static inline void gfs2_add_inode_blocks(struct inode *inode, s64 change)
 63{
 64	gfs2_assert(GFS2_SB(inode), (change >= 0 || inode->i_blocks > -change));
 65	change *= (GFS2_SB(inode)->sd_sb.sb_bsize/GFS2_BASIC_BLOCK);
 66	inode->i_blocks += change;
 67}
 68
 69static inline int gfs2_check_inum(const struct gfs2_inode *ip, u64 no_addr,
 70				  u64 no_formal_ino)
 71{
 72	return ip->i_no_addr == no_addr && ip->i_no_formal_ino == no_formal_ino;
 73}
 74
 75static inline void gfs2_inum_out(const struct gfs2_inode *ip,
 76				 struct gfs2_dirent *dent)
 77{
 78	dent->de_inum.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
 79	dent->de_inum.no_addr = cpu_to_be64(ip->i_no_addr);
 80}
 81
 82static inline int gfs2_check_internal_file_size(struct inode *inode,
 83						u64 minsize, u64 maxsize)
 84{
 85	u64 size = i_size_read(inode);
 86	if (size < minsize || size > maxsize)
 87		goto err;
 88	if (size & ((1 << inode->i_blkbits) - 1))
 89		goto err;
 90	return 0;
 91err:
 92	gfs2_consist_inode(GFS2_I(inode));
 93	return -EIO;
 94}
 95
 96extern struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned type, 
 97				       u64 no_addr, u64 no_formal_ino,
 98				       int non_block);
 99extern struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
100					 u64 *no_formal_ino,
101					 unsigned int blktype);
102extern struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int nonblock);
103
104extern int gfs2_inode_refresh(struct gfs2_inode *ip);
105
106extern struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
107				  int is_root);
108extern int gfs2_permission(struct inode *inode, int mask);
109extern int gfs2_setattr_simple(struct inode *inode, struct iattr *attr);
110extern struct inode *gfs2_lookup_simple(struct inode *dip, const char *name);
111extern void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf);
112
113extern const struct inode_operations gfs2_file_iops;
114extern const struct inode_operations gfs2_dir_iops;
115extern const struct inode_operations gfs2_symlink_iops;
116extern const struct file_operations gfs2_file_fops_nolock;
117extern const struct file_operations gfs2_dir_fops_nolock;
118
119extern void gfs2_set_inode_flags(struct inode *inode);
120 
121#ifdef CONFIG_GFS2_FS_LOCKING_DLM
122extern const struct file_operations gfs2_file_fops;
123extern const struct file_operations gfs2_dir_fops;
124
125static inline int gfs2_localflocks(const struct gfs2_sbd *sdp)
126{
127	return sdp->sd_args.ar_localflocks;
128}
129#else /* Single node only */
130#define gfs2_file_fops gfs2_file_fops_nolock
131#define gfs2_dir_fops gfs2_dir_fops_nolock
132
133static inline int gfs2_localflocks(const struct gfs2_sbd *sdp)
134{
135	return 1;
136}
137#endif /* CONFIG_GFS2_FS_LOCKING_DLM */
138
139#endif /* __INODE_DOT_H__ */
140