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 
jfs_fsync(struct file * file,loff_t start,loff_t end,int datasync)32 int 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 = file_write_and_wait_range(file, start, end);
38 	if (rc)
39 		return rc;
40 
41 	inode_lock(inode);
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 		inode_unlock(inode);
47 		return rc;
48 	}
49 
50 	rc |= jfs_commit_inode(inode, 1);
51 	inode_unlock(inode);
52 
53 	return rc ? -EIO : 0;
54 }
55 
jfs_open(struct inode * inode,struct file * file)56 static 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 }
jfs_release(struct inode * inode,struct file * file)86 static 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 
jfs_setattr(struct dentry * dentry,struct iattr * iattr)101 int jfs_setattr(struct dentry *dentry, struct iattr *iattr)
102 {
103 	struct inode *inode = d_inode(dentry);
104 	int rc;
105 
106 	rc = setattr_prepare(dentry, 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 
142 const struct inode_operations jfs_file_inode_operations = {
143 	.listxattr	= jfs_listxattr,
144 	.setattr	= jfs_setattr,
145 #ifdef CONFIG_JFS_POSIX_ACL
146 	.get_acl	= jfs_get_acl,
147 	.set_acl	= jfs_set_acl,
148 #endif
149 };
150 
151 const struct file_operations jfs_file_operations = {
152 	.open		= jfs_open,
153 	.llseek		= generic_file_llseek,
154 	.read_iter	= generic_file_read_iter,
155 	.write_iter	= generic_file_write_iter,
156 	.mmap		= generic_file_mmap,
157 	.splice_read	= generic_file_splice_read,
158 	.splice_write	= iter_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