fs/xiafs/fsync.c

/* */
This source file includes following definitions.
sync_block
sync_iblock
sync_direct
sync_indirect
sync_dindirect
xiafs_sync_file
   1 /*
   2  *  linux/fs/xiafs/fsync.c
   3  *
   4  *  Changes Copyright (C) 1993 Stephen Tweedie (sct@dcs.ed.ac.uk)
   5  *  from
   6  *  Copyright (C) 1991, 1992 Linus Torvalds
   7  *
   8  *  xiafs fsync primitive
   9  */
  10 
  11 #include <linux/errno.h>
  12 #include <linux/sched.h>
  13 #include <linux/stat.h>
  14 #include <linux/fcntl.h>
  15 #include <linux/locks.h>
  16 
  17 #include <linux/fs.h>
  18 #include <linux/xia_fs.h>
  19 
  20 #include <asm/segment.h>
  21 #include <asm/system.h>
  22 
  23 #include "xiafs_mac.h"
  24 
  25 
  26 #define blocksize (XIAFS_ZSIZE(inode->i_sb))
  27 #define addr_per_block (XIAFS_ADDRS_PER_Z(inode->i_sb))
  28 
  29 static int sync_block (struct inode * inode, unsigned long * block, int wait)
     /*  */
  30 {
  31         struct buffer_head * bh;
  32         int tmp;
  33         
  34         if (!*block)
  35                 return 0;
  36         tmp = *block;
  37         bh = get_hash_table(inode->i_dev, *block, blocksize);
  38         if (!bh)
  39                 return 0;
  40         if (*block != tmp) {
  41                 brelse (bh);
  42                 return 1;
  43         }
  44         if (wait && buffer_req(bh) && !buffer_uptodate(bh)) {
  45                 brelse(bh);
  46                 return -1;
  47         }
  48         if (wait || !buffer_uptodate(bh) || !buffer_dirty(bh))
  49         {
  50                 brelse(bh);
  51                 return 0;
  52         }
  53         ll_rw_block(WRITE, 1, &bh);
  54         bh->b_count--;
  55         return 0;
  56 }
  57 
  58 static int sync_iblock (struct inode * inode, unsigned long * iblock, 
     /*  */
  59                         struct buffer_head **bh, int wait) 
  60 {
  61         int rc, tmp;
  62         
  63         *bh = NULL;
  64         tmp = *iblock;
  65         if (!tmp)
  66                 return 0;
  67         rc = sync_block (inode, iblock, wait);
  68         if (rc)
  69                 return rc;
  70         *bh = bread(inode->i_dev, tmp, blocksize);
  71         if (tmp != *iblock) {
  72                 brelse(*bh);
  73                 *bh = NULL;
  74                 return 1;
  75         }
  76         if (!*bh)
  77                 return -1;
  78         return 0;
  79 }
  80 
  81 
  82 static int sync_direct(struct inode *inode, int wait)
     /*  */
  83 {
  84         int i;
  85         int rc, err = 0;
  86 
  87         for (i = 0; i < 8; i++) {
  88                 rc = sync_block (inode, inode->u.ext_i.i_data + i, wait);
  89                 if (rc > 0)
  90                         break;
  91                 if (rc)
  92                         err = rc;
  93         }
  94         return err;
  95 }
  96 
  97 static int sync_indirect(struct inode *inode, unsigned long *iblock, int wait)
     /*  */
  98 {
  99         int i;
 100         struct buffer_head * ind_bh;
 101         int rc, err = 0;
 102 
 103         rc = sync_iblock (inode, iblock, &ind_bh, wait);
 104         if (rc || !ind_bh)
 105                 return rc;
 106         
 107         for (i = 0; i < addr_per_block; i++) {
 108                 rc = sync_block (inode, 
 109                                  ((unsigned long *) ind_bh->b_data) + i,
 110                                  wait);
 111                 if (rc > 0)
 112                         break;
 113                 if (rc)
 114                         err = rc;
 115         }
 116         brelse(ind_bh);
 117         return err;
 118 }
 119 
 120 static int sync_dindirect(struct inode *inode, unsigned long *diblock,
     /*  */
 121                           int wait)
 122 {
 123         int i;
 124         struct buffer_head * dind_bh;
 125         int rc, err = 0;
 126 
 127         rc = sync_iblock (inode, diblock, &dind_bh, wait);
 128         if (rc || !dind_bh)
 129                 return rc;
 130         
 131         for (i = 0; i < addr_per_block; i++) {
 132                 rc = sync_indirect (inode,
 133                                     ((unsigned long *) dind_bh->b_data) + i,
 134                                     wait);
 135                 if (rc > 0)
 136                         break;
 137                 if (rc)
 138                         err = rc;
 139         }
 140         brelse(dind_bh);
 141         return err;
 142 }
 143 
 144 int xiafs_sync_file(struct inode * inode, struct file * file)
     /*  */
 145 {
 146         int wait, err = 0;
 147         
 148         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
 149              S_ISLNK(inode->i_mode)))
 150                 return -EINVAL;
 151         for (wait=0; wait<=1; wait++)
 152         {
 153                 err |= sync_direct(inode, wait);
 154                 err |= sync_indirect(inode, &inode->u.xiafs_i.i_ind_zone, wait);
 155                 err |= sync_dindirect(inode, &inode->u.xiafs_i.i_dind_zone, wait);
 156         }
 157         err |= xiafs_sync_inode (inode);
 158         return (err < 0) ? -EIO : 0;
 159 }
/* */
root/fs/xiafs/fsync.c

DEFINITIONS
