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/posix_acl.h>
23#include <linux/quotaops.h>
24#include "jfs_incore.h"
25#include "jfs_inode.h"
26#include "jfs_dmap.h"
27#include "jfs_txnmgr.h"
28#include "jfs_xattr.h"
29#include "jfs_acl.h"
30#include "jfs_debug.h"
31
32int jfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
33{
34	struct inode *inode = file->f_mapping->host;
35	int rc = 0;
36
37	rc = filemap_write_and_wait_range(inode->i_mapping, start, end);
38	if (rc)
39		return rc;
40
41	mutex_lock(&inode->i_mutex);
42	if (!(inode->i_state & I_DIRTY_ALL) ||
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		mutex_unlock(&inode->i_mutex);
47		return rc;
48	}
49
50	rc |= jfs_commit_inode(inode, 1);
51	mutex_unlock(&inode->i_mutex);
52
53	return rc ? -EIO : 0;
54}
55
56static int jfs_open(struct inode *inode, struct file *file)
57{
58	int rc;
59
60	if ((rc = dquot_file_open(inode, file)))
61		return rc;
62
63	/*
64	 * We attempt to allow only one "active" file open per aggregate
65	 * group.  Otherwise, appending to files in parallel can cause
66	 * fragmentation within the files.
67	 *
68	 * If the file is empty, it was probably just created and going
69	 * to be written to.  If it has a size, we'll hold off until the
70	 * file is actually grown.
71	 */
72	if (S_ISREG(inode->i_mode) && file->f_mode & FMODE_WRITE &&
73	    (inode->i_size == 0)) {
74		struct jfs_inode_info *ji = JFS_IP(inode);
75		spin_lock_irq(&ji->ag_lock);
76		if (ji->active_ag == -1) {
77			struct jfs_sb_info *jfs_sb = JFS_SBI(inode->i_sb);
78			ji->active_ag = BLKTOAG(addressPXD(&ji->ixpxd), jfs_sb);
79			atomic_inc(&jfs_sb->bmap->db_active[ji->active_ag]);
80		}
81		spin_unlock_irq(&ji->ag_lock);
82	}
83
84	return 0;
85}
86static int jfs_release(struct inode *inode, struct file *file)
87{
88	struct jfs_inode_info *ji = JFS_IP(inode);
89
90	spin_lock_irq(&ji->ag_lock);
91	if (ji->active_ag != -1) {
92		struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
93		atomic_dec(&bmap->db_active[ji->active_ag]);
94		ji->active_ag = -1;
95	}
96	spin_unlock_irq(&ji->ag_lock);
97
98	return 0;
99}
100
101int jfs_setattr(struct dentry *dentry, struct iattr *iattr)
102{
103	struct inode *inode = d_inode(dentry);
104	int rc;
105
106	rc = inode_change_ok(inode, iattr);
107	if (rc)
108		return rc;
109
110	if (is_quota_modification(inode, iattr)) {
111		rc = dquot_initialize(inode);
112		if (rc)
113			return rc;
114	}
115	if ((iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)) ||
116	    (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid))) {
117		rc = dquot_transfer(inode, iattr);
118		if (rc)
119			return rc;
120	}
121
122	if ((iattr->ia_valid & ATTR_SIZE) &&
123	    iattr->ia_size != i_size_read(inode)) {
124		inode_dio_wait(inode);
125
126		rc = inode_newsize_ok(inode, iattr->ia_size);
127		if (rc)
128			return rc;
129
130		truncate_setsize(inode, iattr->ia_size);
131		jfs_truncate(inode);
132	}
133
134	setattr_copy(inode, iattr);
135	mark_inode_dirty(inode);
136
137	if (iattr->ia_valid & ATTR_MODE)
138		rc = posix_acl_chmod(inode, inode->i_mode);
139	return rc;
140}
141
142const struct inode_operations jfs_file_inode_operations = {
143	.setxattr	= jfs_setxattr,
144	.getxattr	= jfs_getxattr,
145	.listxattr	= jfs_listxattr,
146	.removexattr	= jfs_removexattr,
147	.setattr	= jfs_setattr,
148#ifdef CONFIG_JFS_POSIX_ACL
149	.get_acl	= jfs_get_acl,
150	.set_acl	= jfs_set_acl,
151#endif
152};
153
154const struct file_operations jfs_file_operations = {
155	.open		= jfs_open,
156	.llseek		= generic_file_llseek,
157	.read_iter	= generic_file_read_iter,
158	.write_iter	= generic_file_write_iter,
159	.mmap		= generic_file_mmap,
160	.splice_read	= generic_file_splice_read,
161	.splice_write	= iter_file_splice_write,
162	.fsync		= jfs_fsync,
163	.release	= jfs_release,
164	.unlocked_ioctl = jfs_ioctl,
165#ifdef CONFIG_COMPAT
166	.compat_ioctl	= jfs_compat_ioctl,
167#endif
168};
169