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_page_add_databufs(struct gfs2_inode *ip, struct page *page,
  23                                    unsigned int from, unsigned int to);
  24 extern void gfs2_set_aops(struct inode *inode);
  25
  26 static inline int gfs2_is_stuffed(const struct gfs2_inode *ip)
  27 {
  28         return !ip->i_height;
  29 }
  30
  31 static inline int gfs2_is_jdata(const struct gfs2_inode *ip)
  32 {
  33         return ip->i_diskflags & GFS2_DIF_JDATA;
  34 }
  35
  36 static inline int gfs2_is_writeback(const struct gfs2_inode *ip)
  37 {
  38         const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
  39         return (sdp->sd_args.ar_data == GFS2_DATA_WRITEBACK) && !gfs2_is_jdata(ip);
  40 }
  41
  42 static inline int gfs2_is_ordered(const struct gfs2_inode *ip)
  43 {
  44         const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
  45         return (sdp->sd_args.ar_data == GFS2_DATA_ORDERED) && !gfs2_is_jdata(ip);
  46 }
  47
  48 static inline int gfs2_is_dir(const struct gfs2_inode *ip)
  49 {
  50         return S_ISDIR(ip->i_inode.i_mode);
  51 }
  52
  53 static inline void gfs2_set_inode_blocks(struct inode *inode, u64 blocks)
  54 {
  55         inode->i_blocks = blocks <<
  56                 (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
  57 }
  58
  59 static inline u64 gfs2_get_inode_blocks(const struct inode *inode)
  60 {
  61         return inode->i_blocks >>
  62                 (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
  63 }
  64
  65 static inline void gfs2_add_inode_blocks(struct inode *inode, s64 change)
  66 {
  67         gfs2_assert(GFS2_SB(inode), (change >= 0 || inode->i_blocks > -change));
  68         change *= (GFS2_SB(inode)->sd_sb.sb_bsize/GFS2_BASIC_BLOCK);
  69         inode->i_blocks += change;
  70 }
  71
  72 static inline int gfs2_check_inum(const struct gfs2_inode *ip, u64 no_addr,
  73                                   u64 no_formal_ino)
  74 {
  75         return ip->i_no_addr == no_addr && ip->i_no_formal_ino == no_formal_ino;
  76 }
  77
  78 static inline void gfs2_inum_out(const struct gfs2_inode *ip,
  79                                  struct gfs2_dirent *dent)
  80 {
  81         dent->de_inum.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
  82         dent->de_inum.no_addr = cpu_to_be64(ip->i_no_addr);
  83 }
  84
  85 static inline int gfs2_check_internal_file_size(struct inode *inode,
  86                                                 u64 minsize, u64 maxsize)
  87 {
  88         u64 size = i_size_read(inode);
  89         if (size < minsize || size > maxsize)
  90                 goto err;
  91         if (size & ((1 << inode->i_blkbits) - 1))
  92                 goto err;
  93         return 0;
  94 err:
  95         gfs2_consist_inode(GFS2_I(inode));
  96         return -EIO;
  97 }
  98
  99 extern struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned type,
 100                                        u64 no_addr, u64 no_formal_ino,
 101                                        int non_block);
 102 extern struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
 103                                          u64 *no_formal_ino,
 104                                          unsigned int blktype);
 105 extern struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int nonblock);
 106
 107 extern int gfs2_inode_refresh(struct gfs2_inode *ip);
 108
 109 extern struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
 110                                   int is_root);
 111 extern int gfs2_permission(struct inode *inode, int mask);
 112 extern int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr);
 113 extern struct inode *gfs2_lookup_simple(struct inode *dip, const char *name);
 114 extern void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf);
 115
 116 extern const struct inode_operations gfs2_file_iops;
 117 extern const struct inode_operations gfs2_dir_iops;
 118 extern const struct inode_operations gfs2_symlink_iops;
 119 extern const struct file_operations gfs2_file_fops_nolock;
 120 extern const struct file_operations gfs2_dir_fops_nolock;
 121
 122 extern void gfs2_set_inode_flags(struct inode *inode);
 123
 124 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
 125 extern const struct file_operations gfs2_file_fops;
 126 extern const struct file_operations gfs2_dir_fops;
 127
 128 static inline int gfs2_localflocks(const struct gfs2_sbd *sdp)
 129 {
 130         return sdp->sd_args.ar_localflocks;
 131 }
 132 #else /* Single node only */
 133 #define gfs2_file_fops gfs2_file_fops_nolock
 134 #define gfs2_dir_fops gfs2_dir_fops_nolock
 135
 136 static inline int gfs2_localflocks(const struct gfs2_sbd *sdp)
 137 {
 138         return 1;
 139 }
 140 #endif /* CONFIG_GFS2_FS_LOCKING_DLM */
 141
 142 #endif /* __INODE_DOT_H__ */
 143