1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *   Copyright (C) International Business Machines Corp., 2000-2002
4 *   Portions Copyright (C) Christoph Hellwig, 2001-2002
5 */
6
7#include <linux/mm.h>
8#include <linux/fs.h>
9#include <linux/posix_acl.h>
10#include <linux/quotaops.h>
11#include "jfs_incore.h"
12#include "jfs_inode.h"
13#include "jfs_dmap.h"
14#include "jfs_txnmgr.h"
15#include "jfs_xattr.h"
16#include "jfs_acl.h"
17#include "jfs_debug.h"
18
19int jfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
20{
21	struct inode *inode = file->f_mapping->host;
22	int rc = 0;
23
24	rc = file_write_and_wait_range(file, start, end);
25	if (rc)
26		return rc;
27
28	inode_lock(inode);
29	if (!(inode->i_state & I_DIRTY_ALL) ||
30	    (datasync && !(inode->i_state & I_DIRTY_DATASYNC))) {
31		/* Make sure committed changes hit the disk */
32		jfs_flush_journal(JFS_SBI(inode->i_sb)->log, 1);
33		inode_unlock(inode);
34		return rc;
35	}
36
37	rc |= jfs_commit_inode(inode, 1);
38	inode_unlock(inode);
39
40	return rc ? -EIO : 0;
41}
42
43static int jfs_open(struct inode *inode, struct file *file)
44{
45	int rc;
46
47	if ((rc = dquot_file_open(inode, file)))
48		return rc;
49
50	/*
51	 * We attempt to allow only one "active" file open per aggregate
52	 * group.  Otherwise, appending to files in parallel can cause
53	 * fragmentation within the files.
54	 *
55	 * If the file is empty, it was probably just created and going
56	 * to be written to.  If it has a size, we'll hold off until the
57	 * file is actually grown.
58	 */
59	if (S_ISREG(inode->i_mode) && file->f_mode & FMODE_WRITE &&
60	    (inode->i_size == 0)) {
61		struct jfs_inode_info *ji = JFS_IP(inode);
62		spin_lock_irq(&ji->ag_lock);
63		if (ji->active_ag == -1) {
64			struct jfs_sb_info *jfs_sb = JFS_SBI(inode->i_sb);
65			ji->active_ag = BLKTOAG(addressPXD(&ji->ixpxd), jfs_sb);
66			atomic_inc(&jfs_sb->bmap->db_active[ji->active_ag]);
67		}
68		spin_unlock_irq(&ji->ag_lock);
69	}
70
71	return 0;
72}
73static int jfs_release(struct inode *inode, struct file *file)
74{
75	struct jfs_inode_info *ji = JFS_IP(inode);
76
77	spin_lock_irq(&ji->ag_lock);
78	if (ji->active_ag != -1) {
79		struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
80		atomic_dec(&bmap->db_active[ji->active_ag]);
81		ji->active_ag = -1;
82	}
83	spin_unlock_irq(&ji->ag_lock);
84
85	return 0;
86}
87
88int jfs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
89		struct iattr *iattr)
90{
91	struct inode *inode = d_inode(dentry);
92	int rc;
93
94	rc = setattr_prepare(&nop_mnt_idmap, dentry, iattr);
95	if (rc)
96		return rc;
97
98	if (is_quota_modification(&nop_mnt_idmap, inode, iattr)) {
99		rc = dquot_initialize(inode);
100		if (rc)
101			return rc;
102	}
103	if ((iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)) ||
104	    (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid))) {
105		rc = dquot_transfer(&nop_mnt_idmap, inode, iattr);
106		if (rc)
107			return rc;
108	}
109
110	if ((iattr->ia_valid & ATTR_SIZE) &&
111	    iattr->ia_size != i_size_read(inode)) {
112		inode_dio_wait(inode);
113
114		rc = inode_newsize_ok(inode, iattr->ia_size);
115		if (rc)
116			return rc;
117
118		truncate_setsize(inode, iattr->ia_size);
119		jfs_truncate(inode);
120	}
121
122	setattr_copy(&nop_mnt_idmap, inode, iattr);
123	mark_inode_dirty(inode);
124
125	if (iattr->ia_valid & ATTR_MODE)
126		rc = posix_acl_chmod(&nop_mnt_idmap, dentry, inode->i_mode);
127	return rc;
128}
129
130const struct inode_operations jfs_file_inode_operations = {
131	.listxattr	= jfs_listxattr,
132	.setattr	= jfs_setattr,
133	.fileattr_get	= jfs_fileattr_get,
134	.fileattr_set	= jfs_fileattr_set,
135#ifdef CONFIG_JFS_POSIX_ACL
136	.get_inode_acl	= jfs_get_acl,
137	.set_acl	= jfs_set_acl,
138#endif
139};
140
141const struct file_operations jfs_file_operations = {
142	.open		= jfs_open,
143	.llseek		= generic_file_llseek,
144	.read_iter	= generic_file_read_iter,
145	.write_iter	= generic_file_write_iter,
146	.mmap		= generic_file_mmap,
147	.splice_read	= filemap_splice_read,
148	.splice_write	= iter_file_splice_write,
149	.fsync		= jfs_fsync,
150	.release	= jfs_release,
151	.unlocked_ioctl = jfs_ioctl,
152	.compat_ioctl	= compat_ptr_ioctl,
153};
154