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 <linux/quotaops.h>
  22 #include "jfs_incore.h"
  23 #include "jfs_inode.h"
  24 #include "jfs_dmap.h"
  25 #include "jfs_txnmgr.h"
  26 #include "jfs_xattr.h"
  27 #include "jfs_acl.h"
  28 #include "jfs_debug.h"
  29
  30 int jfs_fsync(struct file *file, int datasync)
  31 {
  32         struct inode *inode = file->f_mapping->host;
  33         int rc = 0;
  34
  35         if (!(inode->i_state & I_DIRTY) ||
  36             (datasync && !(inode->i_state & I_DIRTY_DATASYNC))) {
  37                 /* Make sure committed changes hit the disk */
  38                 jfs_flush_journal(JFS_SBI(inode->i_sb)->log, 1);
  39                 return rc;
  40         }
  41
  42         rc |= jfs_commit_inode(inode, 1);
  43
  44         return rc ? -EIO : 0;
  45 }
  46
  47 static int jfs_open(struct inode *inode, struct file *file)
  48 {
  49         int rc;
  50
  51         if ((rc = dquot_file_open(inode, file)))
  52                 return rc;
  53
  54         /*
  55          * We attempt to allow only one "active" file open per aggregate
  56          * group.  Otherwise, appending to files in parallel can cause
  57          * fragmentation within the files.
  58          *
  59          * If the file is empty, it was probably just created and going
  60          * to be written to.  If it has a size, we'll hold off until the
  61          * file is actually grown.
  62          */
  63         if (S_ISREG(inode->i_mode) && file->f_mode & FMODE_WRITE &&
  64             (inode->i_size == 0)) {
  65                 struct jfs_inode_info *ji = JFS_IP(inode);
  66                 spin_lock_irq(&ji->ag_lock);
  67                 if (ji->active_ag == -1) {
  68                         ji->active_ag = ji->agno;
  69                         atomic_inc(
  70                             &JFS_SBI(inode->i_sb)->bmap->db_active[ji->agno]);
  71                 }
  72                 spin_unlock_irq(&ji->ag_lock);
  73         }
  74
  75         return 0;
  76 }
  77 static int jfs_release(struct inode *inode, struct file *file)
  78 {
  79         struct jfs_inode_info *ji = JFS_IP(inode);
  80
  81         spin_lock_irq(&ji->ag_lock);
  82         if (ji->active_ag != -1) {
  83                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
  84                 atomic_dec(&bmap->db_active[ji->active_ag]);
  85                 ji->active_ag = -1;
  86         }
  87         spin_unlock_irq(&ji->ag_lock);
  88
  89         return 0;
  90 }
  91
  92 int jfs_setattr(struct dentry *dentry, struct iattr *iattr)
  93 {
  94         struct inode *inode = dentry->d_inode;
  95         int rc;
  96
  97         rc = inode_change_ok(inode, iattr);
  98         if (rc)
  99                 return rc;
 100
 101         if (is_quota_modification(inode, iattr))
 102                 dquot_initialize(inode);
 103         if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) ||
 104             (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) {
 105                 rc = dquot_transfer(inode, iattr);
 106                 if (rc)
 107                         return rc;
 108         }
 109
 110         rc = inode_setattr(inode, iattr);
 111
 112         if (!rc && (iattr->ia_valid & ATTR_MODE))
 113                 rc = jfs_acl_chmod(inode);
 114
 115         return rc;
 116 }
 117
 118 const struct inode_operations jfs_file_inode_operations = {
 119         .truncate       = jfs_truncate,
 120         .setxattr       = jfs_setxattr,
 121         .getxattr       = jfs_getxattr,
 122         .listxattr      = jfs_listxattr,
 123         .removexattr    = jfs_removexattr,
 124         .setattr        = jfs_setattr,
 125 #ifdef CONFIG_JFS_POSIX_ACL
 126         .check_acl      = jfs_check_acl,
 127 #endif
 128 };
 129
 130 const struct file_operations jfs_file_operations = {
 131         .open           = jfs_open,
 132         .llseek         = generic_file_llseek,
 133         .write          = do_sync_write,
 134         .read           = do_sync_read,
 135         .aio_read       = generic_file_aio_read,
 136         .aio_write      = generic_file_aio_write,
 137         .mmap           = generic_file_mmap,
 138         .splice_read    = generic_file_splice_read,
 139         .splice_write   = generic_file_splice_write,
 140         .fsync          = jfs_fsync,
 141         .release        = jfs_release,
 142         .unlocked_ioctl = jfs_ioctl,
 143 #ifdef CONFIG_COMPAT
 144         .compat_ioctl   = jfs_compat_ioctl,
 145 #endif
 146 };