fs/jfs/file.c

   1 /*
   2  *   Copyright (c) International Business Machines Corp., 2000-2002
   3  *   Portions Copyright (c) Christoph Hellwig, 2001-2002
   4  *
   5  *   This program is free software;  you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation; either version 2 of the License, or
   8  *   (at your option) any later version.
   9  *
  10  *   This program is distributed in the hope that it will be useful,
  11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  13  *   the GNU General Public License for more details.
  14  *
  15  *   You should have received a copy of the GNU General Public License
  16  *   along with this program;  if not, write to the Free Software
  17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18  */
  19
  20 #include <linux/fs.h>
  21 #include "jfs_incore.h"
  22 #include "jfs_dmap.h"
  23 #include "jfs_txnmgr.h"
  24 #include "jfs_xattr.h"
  25 #include "jfs_acl.h"
  26 #include "jfs_debug.h"
  27
  28
  29 extern int jfs_commit_inode(struct inode *, int);
  30 extern void jfs_truncate(struct inode *);
  31
  32 int jfs_fsync(struct file *file, struct dentry *dentry, int datasync)
  33 {
  34         struct inode *inode = dentry->d_inode;
  35         int rc = 0;
  36
  37         if (!(inode->i_state & I_DIRTY) ||
  38             (datasync && !(inode->i_state & I_DIRTY_DATASYNC))) {
  39                 /* Make sure committed changes hit the disk */
  40                 jfs_flush_journal(JFS_SBI(inode->i_sb)->log, 1);
  41                 return rc;
  42         }
  43
  44         rc |= jfs_commit_inode(inode, 1);
  45
  46         return rc ? -EIO : 0;
  47 }
  48
  49 static int jfs_open(struct inode *inode, struct file *file)
  50 {
  51         int rc;
  52
  53         if ((rc = generic_file_open(inode, file)))
  54                 return rc;
  55
  56         /*
  57          * We attempt to allow only one "active" file open per aggregate
  58          * group.  Otherwise, appending to files in parallel can cause
  59          * fragmentation within the files.
  60          *
  61          * If the file is empty, it was probably just created and going
  62          * to be written to.  If it has a size, we'll hold off until the
  63          * file is actually grown.
  64          */
  65         if (S_ISREG(inode->i_mode) && file->f_mode & FMODE_WRITE &&
  66             (inode->i_size == 0)) {
  67                 struct jfs_inode_info *ji = JFS_IP(inode);
  68                 spin_lock_irq(&ji->ag_lock);
  69                 if (ji->active_ag == -1) {
  70                         ji->active_ag = ji->agno;
  71                         atomic_inc(
  72                             &JFS_SBI(inode->i_sb)->bmap->db_active[ji->agno]);
  73                 }
  74                 spin_unlock_irq(&ji->ag_lock);
  75         }
  76
  77         return 0;
  78 }
  79 static int jfs_release(struct inode *inode, struct file *file)
  80 {
  81         struct jfs_inode_info *ji = JFS_IP(inode);
  82
  83         spin_lock_irq(&ji->ag_lock);
  84         if (ji->active_ag != -1) {
  85                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
  86                 atomic_dec(&bmap->db_active[ji->active_ag]);
  87                 ji->active_ag = -1;
  88         }
  89         spin_unlock_irq(&ji->ag_lock);
  90
  91         return 0;
  92 }
  93
  94 struct inode_operations jfs_file_inode_operations = {
  95         .truncate       = jfs_truncate,
  96         .setxattr       = jfs_setxattr,
  97         .getxattr       = jfs_getxattr,
  98         .listxattr      = jfs_listxattr,
  99         .removexattr    = jfs_removexattr,
 100 #ifdef CONFIG_JFS_POSIX_ACL
 101         .setattr        = jfs_setattr,
 102         .permission     = jfs_permission,
 103 #endif
 104 };
 105
 106 struct file_operations jfs_file_operations = {
 107         .open           = jfs_open,
 108         .llseek         = generic_file_llseek,
 109         .write          = generic_file_write,
 110         .read           = generic_file_read,
 111         .aio_read       = generic_file_aio_read,
 112         .aio_write      = generic_file_aio_write,
 113         .mmap           = generic_file_mmap,
 114         .readv          = generic_file_readv,
 115         .writev         = generic_file_writev,
 116         .sendfile       = generic_file_sendfile,
 117         .fsync          = jfs_fsync,
 118         .release        = jfs_release,
 119 };