ia64/linux-2.6.18-xen.hg

view fs/jfs/file.c @ 524:7f8b544237bf

netfront: Allow netfront in domain 0.

This is useful if your physical network device is in a utility domain.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Apr 15 15:18:58 2008 +0100 (2008-04-15)
parents 831230e53067
children
line source
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 */
20 #include <linux/fs.h>
21 #include "jfs_incore.h"
22 #include "jfs_inode.h"
23 #include "jfs_dmap.h"
24 #include "jfs_txnmgr.h"
25 #include "jfs_xattr.h"
26 #include "jfs_acl.h"
27 #include "jfs_debug.h"
29 int jfs_fsync(struct file *file, struct dentry *dentry, int datasync)
30 {
31 struct inode *inode = dentry->d_inode;
32 int rc = 0;
34 if (!(inode->i_state & I_DIRTY) ||
35 (datasync && !(inode->i_state & I_DIRTY_DATASYNC))) {
36 /* Make sure committed changes hit the disk */
37 jfs_flush_journal(JFS_SBI(inode->i_sb)->log, 1);
38 return rc;
39 }
41 rc |= jfs_commit_inode(inode, 1);
43 return rc ? -EIO : 0;
44 }
46 static int jfs_open(struct inode *inode, struct file *file)
47 {
48 int rc;
50 if ((rc = generic_file_open(inode, file)))
51 return rc;
53 /*
54 * We attempt to allow only one "active" file open per aggregate
55 * group. Otherwise, appending to files in parallel can cause
56 * fragmentation within the files.
57 *
58 * If the file is empty, it was probably just created and going
59 * to be written to. If it has a size, we'll hold off until the
60 * file is actually grown.
61 */
62 if (S_ISREG(inode->i_mode) && file->f_mode & FMODE_WRITE &&
63 (inode->i_size == 0)) {
64 struct jfs_inode_info *ji = JFS_IP(inode);
65 spin_lock_irq(&ji->ag_lock);
66 if (ji->active_ag == -1) {
67 ji->active_ag = ji->agno;
68 atomic_inc(
69 &JFS_SBI(inode->i_sb)->bmap->db_active[ji->agno]);
70 }
71 spin_unlock_irq(&ji->ag_lock);
72 }
74 return 0;
75 }
76 static int jfs_release(struct inode *inode, struct file *file)
77 {
78 struct jfs_inode_info *ji = JFS_IP(inode);
80 spin_lock_irq(&ji->ag_lock);
81 if (ji->active_ag != -1) {
82 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
83 atomic_dec(&bmap->db_active[ji->active_ag]);
84 ji->active_ag = -1;
85 }
86 spin_unlock_irq(&ji->ag_lock);
88 return 0;
89 }
91 struct inode_operations jfs_file_inode_operations = {
92 .truncate = jfs_truncate,
93 .setxattr = jfs_setxattr,
94 .getxattr = jfs_getxattr,
95 .listxattr = jfs_listxattr,
96 .removexattr = jfs_removexattr,
97 #ifdef CONFIG_JFS_POSIX_ACL
98 .setattr = jfs_setattr,
99 .permission = jfs_permission,
100 #endif
101 };
103 const struct file_operations jfs_file_operations = {
104 .open = jfs_open,
105 .llseek = generic_file_llseek,
106 .write = generic_file_write,
107 .read = generic_file_read,
108 .aio_read = generic_file_aio_read,
109 .aio_write = generic_file_aio_write,
110 .mmap = generic_file_mmap,
111 .readv = generic_file_readv,
112 .writev = generic_file_writev,
113 .sendfile = generic_file_sendfile,
114 .fsync = jfs_fsync,
115 .release = jfs_release,
116 .ioctl = jfs_ioctl,
117 };