1/*
2 * linux/fs/jfs/ioctl.c
3 *
4 * Copyright (C) 2006 Herbert Poetzl
5 * adapted from Remy Card's ext2/ioctl.c
6 */
7
8#include <linux/fs.h>
9#include <linux/ctype.h>
10#include <linux/capability.h>
11#include <linux/mount.h>
12#include <linux/time.h>
13#include <linux/sched.h>
14#include <linux/blkdev.h>
15#include <asm/current.h>
16#include <asm/uaccess.h>
17
18#include "jfs_filsys.h"
19#include "jfs_debug.h"
20#include "jfs_incore.h"
21#include "jfs_dinode.h"
22#include "jfs_inode.h"
23#include "jfs_dmap.h"
24#include "jfs_discard.h"
25
26static struct {
27	long jfs_flag;
28	long ext2_flag;
29} jfs_map[] = {
30	{JFS_NOATIME_FL,	FS_NOATIME_FL},
31	{JFS_DIRSYNC_FL,	FS_DIRSYNC_FL},
32	{JFS_SYNC_FL,		FS_SYNC_FL},
33	{JFS_SECRM_FL,		FS_SECRM_FL},
34	{JFS_UNRM_FL,		FS_UNRM_FL},
35	{JFS_APPEND_FL,		FS_APPEND_FL},
36	{JFS_IMMUTABLE_FL,	FS_IMMUTABLE_FL},
37	{0, 0},
38};
39
40static long jfs_map_ext2(unsigned long flags, int from)
41{
42	int index=0;
43	long mapped=0;
44
45	while (jfs_map[index].jfs_flag) {
46		if (from) {
47			if (jfs_map[index].ext2_flag & flags)
48				mapped |= jfs_map[index].jfs_flag;
49		} else {
50			if (jfs_map[index].jfs_flag & flags)
51				mapped |= jfs_map[index].ext2_flag;
52		}
53		index++;
54	}
55	return mapped;
56}
57
58
59long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
60{
61	struct inode *inode = file_inode(filp);
62	struct jfs_inode_info *jfs_inode = JFS_IP(inode);
63	unsigned int flags;
64
65	switch (cmd) {
66	case JFS_IOC_GETFLAGS:
67		jfs_get_inode_flags(jfs_inode);
68		flags = jfs_inode->mode2 & JFS_FL_USER_VISIBLE;
69		flags = jfs_map_ext2(flags, 0);
70		return put_user(flags, (int __user *) arg);
71	case JFS_IOC_SETFLAGS: {
72		unsigned int oldflags;
73		int err;
74
75		err = mnt_want_write_file(filp);
76		if (err)
77			return err;
78
79		if (!inode_owner_or_capable(inode)) {
80			err = -EACCES;
81			goto setflags_out;
82		}
83		if (get_user(flags, (int __user *) arg)) {
84			err = -EFAULT;
85			goto setflags_out;
86		}
87
88		flags = jfs_map_ext2(flags, 1);
89		if (!S_ISDIR(inode->i_mode))
90			flags &= ~JFS_DIRSYNC_FL;
91
92		/* Is it quota file? Do not allow user to mess with it */
93		if (IS_NOQUOTA(inode)) {
94			err = -EPERM;
95			goto setflags_out;
96		}
97
98		/* Lock against other parallel changes of flags */
99		mutex_lock(&inode->i_mutex);
100
101		jfs_get_inode_flags(jfs_inode);
102		oldflags = jfs_inode->mode2;
103
104		/*
105		 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
106		 * the relevant capability.
107		 */
108		if ((oldflags & JFS_IMMUTABLE_FL) ||
109			((flags ^ oldflags) &
110			(JFS_APPEND_FL | JFS_IMMUTABLE_FL))) {
111			if (!capable(CAP_LINUX_IMMUTABLE)) {
112				mutex_unlock(&inode->i_mutex);
113				err = -EPERM;
114				goto setflags_out;
115			}
116		}
117
118		flags = flags & JFS_FL_USER_MODIFIABLE;
119		flags |= oldflags & ~JFS_FL_USER_MODIFIABLE;
120		jfs_inode->mode2 = flags;
121
122		jfs_set_inode_flags(inode);
123		mutex_unlock(&inode->i_mutex);
124		inode->i_ctime = CURRENT_TIME_SEC;
125		mark_inode_dirty(inode);
126setflags_out:
127		mnt_drop_write_file(filp);
128		return err;
129	}
130
131	case FITRIM:
132	{
133		struct super_block *sb = inode->i_sb;
134		struct request_queue *q = bdev_get_queue(sb->s_bdev);
135		struct fstrim_range range;
136		s64 ret = 0;
137
138		if (!capable(CAP_SYS_ADMIN))
139			return -EPERM;
140
141		if (!blk_queue_discard(q)) {
142			jfs_warn("FITRIM not supported on device");
143			return -EOPNOTSUPP;
144		}
145
146		if (copy_from_user(&range, (struct fstrim_range __user *)arg,
147		    sizeof(range)))
148			return -EFAULT;
149
150		range.minlen = max_t(unsigned int, range.minlen,
151			q->limits.discard_granularity);
152
153		ret = jfs_ioc_trim(inode, &range);
154		if (ret < 0)
155			return ret;
156
157		if (copy_to_user((struct fstrim_range __user *)arg, &range,
158		    sizeof(range)))
159			return -EFAULT;
160
161		return 0;
162	}
163
164	default:
165		return -ENOTTY;
166	}
167}
168
169#ifdef CONFIG_COMPAT
170long jfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
171{
172	/* While these ioctl numbers defined with 'long' and have different
173	 * numbers than the 64bit ABI,
174	 * the actual implementation only deals with ints and is compatible.
175	 */
176	switch (cmd) {
177	case JFS_IOC_GETFLAGS32:
178		cmd = JFS_IOC_GETFLAGS;
179		break;
180	case JFS_IOC_SETFLAGS32:
181		cmd = JFS_IOC_SETFLAGS;
182		break;
183	case FITRIM:
184		cmd = FITRIM;
185		break;
186	}
187	return jfs_ioctl(filp, cmd, arg);
188}
189#endif
190