fs/gfs2/inode.h

   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
  18 extern int gfs2_releasepage(struct page *page, gfp_t gfp_mask);
  19 extern int gfs2_internal_read(struct gfs2_inode *ip,
  20                               struct file_ra_state *ra_state,
  21                               char *buf, loff_t *pos, unsigned size);
  22 extern void gfs2_set_aops(struct inode *inode);
  23
  24 static inline int gfs2_is_stuffed(const struct gfs2_inode *ip)
  25 {
  26         return !ip->i_height;
  27 }
  28
  29 static inline int gfs2_is_jdata(const struct gfs2_inode *ip)
  30 {
  31         return ip->i_diskflags & GFS2_DIF_JDATA;
  32 }
  33
  34 static inline int gfs2_is_writeback(const struct gfs2_inode *ip)
  35 {
  36         const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
  37         return (sdp->sd_args.ar_data == GFS2_DATA_WRITEBACK) && !gfs2_is_jdata(ip);
  38 }
  39
  40 static inline int gfs2_is_ordered(const struct gfs2_inode *ip)
  41 {
  42         const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
  43         return (sdp->sd_args.ar_data == GFS2_DATA_ORDERED) && !gfs2_is_jdata(ip);
  44 }
  45
  46 static inline int gfs2_is_dir(const struct gfs2_inode *ip)
  47 {
  48         return S_ISDIR(ip->i_inode.i_mode);
  49 }
  50
  51 static inline void gfs2_set_inode_blocks(struct inode *inode, u64 blocks)
  52 {
  53         inode->i_blocks = blocks <<
  54                 (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
  55 }
  56
  57 static inline u64 gfs2_get_inode_blocks(const struct inode *inode)
  58 {
  59         return inode->i_blocks >>
  60                 (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
  61 }
  62
  63 static inline void gfs2_add_inode_blocks(struct inode *inode, s64 change)
  64 {
  65         gfs2_assert(GFS2_SB(inode), (change >= 0 || inode->i_blocks > -change));
  66         change *= (GFS2_SB(inode)->sd_sb.sb_bsize/GFS2_BASIC_BLOCK);
  67         inode->i_blocks += change;
  68 }
  69
  70 static inline int gfs2_check_inum(const struct gfs2_inode *ip, u64 no_addr,
  71                                   u64 no_formal_ino)
  72 {
  73         return ip->i_no_addr == no_addr && ip->i_no_formal_ino == no_formal_ino;
  74 }
  75
  76 static inline void gfs2_inum_out(const struct gfs2_inode *ip,
  77                                  struct gfs2_dirent *dent)
  78 {
  79         dent->de_inum.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
  80         dent->de_inum.no_addr = cpu_to_be64(ip->i_no_addr);
  81 }
  82
  83
  84 extern void gfs2_set_iop(struct inode *inode);
  85 extern struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned type,
  86                                        u64 no_addr, u64 no_formal_ino,
  87                                        int skip_freeing);
  88 extern struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr);
  89
  90 extern int gfs2_inode_refresh(struct gfs2_inode *ip);
  91
  92 extern int gfs2_dinode_dealloc(struct gfs2_inode *inode);
  93 extern int gfs2_change_nlink(struct gfs2_inode *ip, int diff);
  94 extern struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
  95                                   int is_root);
  96 extern struct inode *gfs2_createi(struct gfs2_holder *ghs,
  97                                   const struct qstr *name,
  98                                   unsigned int mode, dev_t dev);
  99 extern int gfs2_permission(struct inode *inode, int mask);
 100 extern int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr);
 101 extern struct inode *gfs2_lookup_simple(struct inode *dip, const char *name);
 102 extern void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf);
 103 extern void gfs2_dinode_print(const struct gfs2_inode *ip);
 104
 105 extern const struct inode_operations gfs2_file_iops;
 106 extern const struct inode_operations gfs2_dir_iops;
 107 extern const struct inode_operations gfs2_symlink_iops;
 108 extern const struct file_operations gfs2_file_fops_nolock;
 109 extern const struct file_operations gfs2_dir_fops_nolock;
 110
 111 extern void gfs2_set_inode_flags(struct inode *inode);
 112
 113 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
 114 extern const struct file_operations gfs2_file_fops;
 115 extern const struct file_operations gfs2_dir_fops;
 116
 117 static inline int gfs2_localflocks(const struct gfs2_sbd *sdp)
 118 {
 119         return sdp->sd_args.ar_localflocks;
 120 }
 121 #else /* Single node only */
 122 #define gfs2_file_fops gfs2_file_fops_nolock
 123 #define gfs2_dir_fops gfs2_dir_fops_nolock
 124
 125 static inline int gfs2_localflocks(const struct gfs2_sbd *sdp)
 126 {
 127         return 1;
 128 }
 129 #endif /* CONFIG_GFS2_FS_LOCKING_DLM */
 130
 131 #endif /* __INODE_DOT_H__ */
 132