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/mm.h>
  21 #include <linux/fs.h>
  22 #include <linux/quotaops.h>
  23 #include "jfs_incore.h"
  24 #include "jfs_inode.h"
  25 #include "jfs_dmap.h"
  26 #include "jfs_txnmgr.h"
  27 #include "jfs_xattr.h"
  28 #include "jfs_acl.h"
  29 #include "jfs_debug.h"
  30
  31 int jfs_fsync(struct file *file, int datasync)
  32 {
  33         struct inode *inode = file->f_mapping->host;
  34         int rc = 0;
  35
  36         if (!(inode->i_state & I_DIRTY) ||
  37             (datasync && !(inode->i_state & I_DIRTY_DATASYNC))) {
  38                 /* Make sure committed changes hit the disk */
  39                 jfs_flush_journal(JFS_SBI(inode->i_sb)->log, 1);
  40                 return rc;
  41         }
  42
  43         rc |= jfs_commit_inode(inode, 1);
  44
  45         return rc ? -EIO : 0;
  46 }
  47
  48 static int jfs_open(struct inode *inode, struct file *file)
  49 {
  50         int rc;
  51
  52         if ((rc = dquot_file_open(inode, file)))
  53                 return rc;
  54
  55         /*
  56          * We attempt to allow only one "active" file open per aggregate
  57          * group.  Otherwise, appending to files in parallel can cause
  58          * fragmentation within the files.
  59          *
  60          * If the file is empty, it was probably just created and going
  61          * to be written to.  If it has a size, we'll hold off until the
  62          * file is actually grown.
  63          */
  64         if (S_ISREG(inode->i_mode) && file->f_mode & FMODE_WRITE &&
  65             (inode->i_size == 0)) {
  66                 struct jfs_inode_info *ji = JFS_IP(inode);
  67                 spin_lock_irq(&ji->ag_lock);
  68                 if (ji->active_ag == -1) {
  69                         ji->active_ag = ji->agno;
  70                         atomic_inc(
  71                             &JFS_SBI(inode->i_sb)->bmap->db_active[ji->agno]);
  72                 }
  73                 spin_unlock_irq(&ji->ag_lock);
  74         }
  75
  76         return 0;
  77 }
  78 static int jfs_release(struct inode *inode, struct file *file)
  79 {
  80         struct jfs_inode_info *ji = JFS_IP(inode);
  81
  82         spin_lock_irq(&ji->ag_lock);
  83         if (ji->active_ag != -1) {
  84                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
  85                 atomic_dec(&bmap->db_active[ji->active_ag]);
  86                 ji->active_ag = -1;
  87         }
  88         spin_unlock_irq(&ji->ag_lock);
  89
  90         return 0;
  91 }
  92
  93 int jfs_setattr(struct dentry *dentry, struct iattr *iattr)
  94 {
  95         struct inode *inode = dentry->d_inode;
  96         int rc;
  97
  98         rc = inode_change_ok(inode, iattr);
  99         if (rc)
 100                 return rc;
 101
 102         if (is_quota_modification(inode, iattr))
 103                 dquot_initialize(inode);
 104         if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) ||
 105             (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) {
 106                 rc = dquot_transfer(inode, iattr);
 107                 if (rc)
 108                         return rc;
 109         }
 110
 111         if ((iattr->ia_valid & ATTR_SIZE) &&
 112             iattr->ia_size != i_size_read(inode)) {
 113                 rc = vmtruncate(inode, iattr->ia_size);
 114                 if (rc)
 115                         return rc;
 116         }
 117
 118         setattr_copy(inode, iattr);
 119         mark_inode_dirty(inode);
 120
 121         if (iattr->ia_valid & ATTR_MODE)
 122                 rc = jfs_acl_chmod(inode);
 123         return rc;
 124 }
 125
 126 const struct inode_operations jfs_file_inode_operations = {
 127         .truncate       = jfs_truncate,
 128         .setxattr       = jfs_setxattr,
 129         .getxattr       = jfs_getxattr,
 130         .listxattr      = jfs_listxattr,
 131         .removexattr    = jfs_removexattr,
 132         .setattr        = jfs_setattr,
 133 #ifdef CONFIG_JFS_POSIX_ACL
 134         .check_acl      = jfs_check_acl,
 135 #endif
 136 };
 137
 138 const struct file_operations jfs_file_operations = {
 139         .open           = jfs_open,
 140         .llseek         = generic_file_llseek,
 141         .write          = do_sync_write,
 142         .read           = do_sync_read,
 143         .aio_read       = generic_file_aio_read,
 144         .aio_write      = generic_file_aio_write,
 145         .mmap           = generic_file_mmap,
 146         .splice_read    = generic_file_splice_read,
 147         .splice_write   = generic_file_splice_write,
 148         .fsync          = jfs_fsync,
 149         .release        = jfs_release,
 150         .unlocked_ioctl = jfs_ioctl,
 151 #ifdef CONFIG_COMPAT
 152         .compat_ioctl   = jfs_compat_ioctl,
 153 #endif
 154 };