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 = filemap_write_and_wait_range(inode->i_mapping, 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