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_debug.h"
26
27
28 extern int jfs_commit_inode(struct inode *, int);
29 extern void jfs_truncate(struct inode *);
30
jfs_fsync(struct file * file,struct dentry * dentry,int datasync)31 int jfs_fsync(struct file *file, struct dentry *dentry, int datasync)
32 {
33 struct inode *inode = dentry->d_inode;
34 int rc = 0;
35
36 /* No need to resync the data at commit time, unless this flag gets
37 * set again */
38 clear_cflag(COMMIT_Syncdata, inode);
39
40 rc = fsync_inode_data_buffers(inode);
41
42 if (!(inode->i_state & I_DIRTY) ||
43 (datasync && !(inode->i_state & I_DIRTY_DATASYNC))) {
44 /* Make sure committed changes hit the disk */
45 jfs_flush_journal(JFS_SBI(inode->i_sb)->log, 1);
46 return rc;
47 }
48
49 rc |= jfs_commit_inode(inode, 1);
50
51 return rc ? -EIO : 0;
52 }
53
jfs_open(struct inode * inode,struct file * file)54 static int jfs_open(struct inode *inode, struct file *file)
55 {
56 int rc;
57
58 if ((rc = generic_file_open(inode, file)))
59 return rc;
60
61 /*
62 * We attempt to allow only one "active" file open per aggregate
63 * group. Otherwise, appending to files in parallel can cause
64 * fragmentation within the files.
65 *
66 * If the file is empty, it was probably just created and going
67 * to be written to. If it has a size, we'll hold off until the
68 * file is actually grown.
69 */
70 if (S_ISREG(inode->i_mode) && file->f_mode & FMODE_WRITE &&
71 (inode->i_size == 0)) {
72 struct jfs_inode_info *ji = JFS_IP(inode);
73 spin_lock_irq(&ji->ag_lock);
74 if (ji->active_ag == -1) {
75 ji->active_ag = ji->agno;
76 atomic_inc(
77 &JFS_SBI(inode->i_sb)->bmap->db_active[ji->agno]);
78 }
79 spin_unlock_irq(&ji->ag_lock);
80 }
81
82 return 0;
83 }
jfs_release(struct inode * inode,struct file * file)84 static int jfs_release(struct inode *inode, struct file *file)
85 {
86 struct jfs_inode_info *ji = JFS_IP(inode);
87
88 spin_lock_irq(&ji->ag_lock);
89 if (ji->active_ag != -1) {
90 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
91 atomic_dec(&bmap->db_active[ji->active_ag]);
92 ji->active_ag = -1;
93 }
94 spin_unlock_irq(&ji->ag_lock);
95
96 return 0;
97 }
98
99 struct inode_operations jfs_file_inode_operations = {
100 .truncate = jfs_truncate,
101 .setxattr = jfs_setxattr,
102 .getxattr = jfs_getxattr,
103 .listxattr = jfs_listxattr,
104 .removexattr = jfs_removexattr,
105 };
106
107 struct file_operations jfs_file_operations = {
108 .open = jfs_open,
109 .llseek = generic_file_llseek,
110 .write = generic_file_write,
111 .read = generic_file_read,
112 .mmap = generic_file_mmap,
113 .fsync = jfs_fsync,
114 .release = jfs_release,
115 };
116