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                               char *buf, loff_t *pos, unsigned size);
  21 extern void gfs2_set_aops(struct inode *inode);
  22
  23 static inline int gfs2_is_stuffed(const struct gfs2_inode *ip)
  24 {
  25         return !ip->i_height;
  26 }
  27
  28 static inline int gfs2_is_jdata(const struct gfs2_inode *ip)
  29 {
  30         return ip->i_diskflags & GFS2_DIF_JDATA;
  31 }
  32
  33 static 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
  39 static 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
  45 static inline int gfs2_is_dir(const struct gfs2_inode *ip)
  46 {
  47         return S_ISDIR(ip->i_inode.i_mode);
  48 }
  49
  50 static 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
  56 static 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
  62 static 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
  69 static 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
  75 static 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
  82 static 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 & (BIT(inode->i_blkbits) - 1))
  89                 goto err;
  90         return 0;
  91 err:
  92         gfs2_consist_inode(GFS2_I(inode));
  93         return -EIO;
  94 }
  95
  96 extern struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned type,
  97                                        u64 no_addr, u64 no_formal_ino,
  98                                        unsigned int blktype);
  99 extern struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
 100                                          u64 *no_formal_ino,
 101                                          unsigned int blktype);
 102
 103 extern int gfs2_inode_refresh(struct gfs2_inode *ip);
 104
 105 extern struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
 106                                   int is_root);
 107 extern int gfs2_permission(struct inode *inode, int mask);
 108 extern int gfs2_setattr_simple(struct inode *inode, struct iattr *attr);
 109 extern struct inode *gfs2_lookup_simple(struct inode *dip, const char *name);
 110 extern void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf);
 111 extern int gfs2_open_common(struct inode *inode, struct file *file);
 112 extern loff_t gfs2_seek_data(struct file *file, loff_t offset);
 113 extern loff_t gfs2_seek_hole(struct file *file, loff_t offset);
 114
 115 extern const struct inode_operations gfs2_file_iops;
 116 extern const struct inode_operations gfs2_dir_iops;
 117 extern const struct inode_operations gfs2_symlink_iops;
 118 extern const struct file_operations gfs2_file_fops_nolock;
 119 extern const struct file_operations gfs2_dir_fops_nolock;
 120
 121 extern void gfs2_set_inode_flags(struct inode *inode);
 122
 123 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
 124 extern const struct file_operations gfs2_file_fops;
 125 extern const struct file_operations gfs2_dir_fops;
 126
 127 static inline int gfs2_localflocks(const struct gfs2_sbd *sdp)
 128 {
 129         return sdp->sd_args.ar_localflocks;
 130 }
 131 #else /* Single node only */
 132 #define gfs2_file_fops gfs2_file_fops_nolock
 133 #define gfs2_dir_fops gfs2_dir_fops_nolock
 134
 135 static inline int gfs2_localflocks(const struct gfs2_sbd *sdp)
 136 {
 137         return 1;
 138 }
 139 #endif /* CONFIG_GFS2_FS_LOCKING_DLM */
 140
 141 #endif /* __INODE_DOT_H__ */
 142