xref: /openbmc/linux/fs/jfs/file.c (revision 31b90347)
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, loff_t start, loff_t end, int datasync)
32 {
33 	struct inode *inode = file->f_mapping->host;
34 	int rc = 0;
35 
36 	rc = filemap_write_and_wait_range(inode->i_mapping, start, end);
37 	if (rc)
38 		return rc;
39 
40 	mutex_lock(&inode->i_mutex);
41 	if (!(inode->i_state & I_DIRTY) ||
42 	    (datasync && !(inode->i_state & I_DIRTY_DATASYNC))) {
43 		/* Make sure committed changes hit the disk */
44 		jfs_flush_journal(JFS_SBI(inode->i_sb)->log, 1);
45 		mutex_unlock(&inode->i_mutex);
46 		return rc;
47 	}
48 
49 	rc |= jfs_commit_inode(inode, 1);
50 	mutex_unlock(&inode->i_mutex);
51 
52 	return rc ? -EIO : 0;
53 }
54 
55 static int jfs_open(struct inode *inode, struct file *file)
56 {
57 	int rc;
58 
59 	if ((rc = dquot_file_open(inode, file)))
60 		return rc;
61 
62 	/*
63 	 * We attempt to allow only one "active" file open per aggregate
64 	 * group.  Otherwise, appending to files in parallel can cause
65 	 * fragmentation within the files.
66 	 *
67 	 * If the file is empty, it was probably just created and going
68 	 * to be written to.  If it has a size, we'll hold off until the
69 	 * file is actually grown.
70 	 */
71 	if (S_ISREG(inode->i_mode) && file->f_mode & FMODE_WRITE &&
72 	    (inode->i_size == 0)) {
73 		struct jfs_inode_info *ji = JFS_IP(inode);
74 		spin_lock_irq(&ji->ag_lock);
75 		if (ji->active_ag == -1) {
76 			struct jfs_sb_info *jfs_sb = JFS_SBI(inode->i_sb);
77 			ji->active_ag = BLKTOAG(addressPXD(&ji->ixpxd), jfs_sb);
78 			atomic_inc( &jfs_sb->bmap->db_active[ji->active_ag]);
79 		}
80 		spin_unlock_irq(&ji->ag_lock);
81 	}
82 
83 	return 0;
84 }
85 static int jfs_release(struct inode *inode, struct file *file)
86 {
87 	struct jfs_inode_info *ji = JFS_IP(inode);
88 
89 	spin_lock_irq(&ji->ag_lock);
90 	if (ji->active_ag != -1) {
91 		struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
92 		atomic_dec(&bmap->db_active[ji->active_ag]);
93 		ji->active_ag = -1;
94 	}
95 	spin_unlock_irq(&ji->ag_lock);
96 
97 	return 0;
98 }
99 
100 int jfs_setattr(struct dentry *dentry, struct iattr *iattr)
101 {
102 	struct inode *inode = dentry->d_inode;
103 	int rc;
104 
105 	rc = inode_change_ok(inode, iattr);
106 	if (rc)
107 		return rc;
108 
109 	if (is_quota_modification(inode, iattr))
110 		dquot_initialize(inode);
111 	if ((iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)) ||
112 	    (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid))) {
113 		rc = dquot_transfer(inode, iattr);
114 		if (rc)
115 			return rc;
116 	}
117 
118 	if ((iattr->ia_valid & ATTR_SIZE) &&
119 	    iattr->ia_size != i_size_read(inode)) {
120 		inode_dio_wait(inode);
121 
122 		rc = inode_newsize_ok(inode, iattr->ia_size);
123 		if (rc)
124 			return rc;
125 
126 		truncate_setsize(inode, iattr->ia_size);
127 		jfs_truncate(inode);
128 	}
129 
130 	setattr_copy(inode, iattr);
131 	mark_inode_dirty(inode);
132 
133 	if (iattr->ia_valid & ATTR_MODE)
134 		rc = jfs_acl_chmod(inode);
135 	return rc;
136 }
137 
138 const struct inode_operations jfs_file_inode_operations = {
139 	.setxattr	= jfs_setxattr,
140 	.getxattr	= jfs_getxattr,
141 	.listxattr	= jfs_listxattr,
142 	.removexattr	= jfs_removexattr,
143 	.setattr	= jfs_setattr,
144 #ifdef CONFIG_JFS_POSIX_ACL
145 	.get_acl	= jfs_get_acl,
146 #endif
147 };
148 
149 const struct file_operations jfs_file_operations = {
150 	.open		= jfs_open,
151 	.llseek		= generic_file_llseek,
152 	.write		= do_sync_write,
153 	.read		= do_sync_read,
154 	.aio_read	= generic_file_aio_read,
155 	.aio_write	= generic_file_aio_write,
156 	.mmap		= generic_file_mmap,
157 	.splice_read	= generic_file_splice_read,
158 	.splice_write	= generic_file_splice_write,
159 	.fsync		= jfs_fsync,
160 	.release	= jfs_release,
161 	.unlocked_ioctl = jfs_ioctl,
162 #ifdef CONFIG_COMPAT
163 	.compat_ioctl	= jfs_compat_ioctl,
164 #endif
165 };
166