1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
|
// SPDX-License-Identifier: GPL-2.0
#ifndef NO_BCACHEFS_FS
#include "bcachefs.h"
#include "chardev.h"
#include "fs.h"
#include "fs-ioctl.h"
#include "quota.h"
#include <linux/compat.h>
#include <linux/mount.h>
#define FS_IOC_GOINGDOWN _IOR('X', 125, __u32)
struct flags_set {
unsigned mask;
unsigned flags;
unsigned projid;
};
static int bch2_inode_flags_set(struct bch_inode_info *inode,
struct bch_inode_unpacked *bi,
void *p)
{
struct bch_fs *c = inode->v.i_sb->s_fs_info;
/*
* We're relying on btree locking here for exclusion with other ioctl
* calls - use the flags in the btree (@bi), not inode->i_flags:
*/
struct flags_set *s = p;
unsigned newflags = s->flags;
unsigned oldflags = bi->bi_flags & s->mask;
if (((newflags ^ oldflags) & (BCH_INODE_APPEND|BCH_INODE_IMMUTABLE)) &&
!capable(CAP_LINUX_IMMUTABLE))
return -EPERM;
if (!S_ISREG(bi->bi_mode) &&
!S_ISDIR(bi->bi_mode) &&
(newflags & (BCH_INODE_NODUMP|BCH_INODE_NOATIME)) != newflags)
return -EINVAL;
bi->bi_flags &= ~s->mask;
bi->bi_flags |= newflags;
bi->bi_ctime = timespec_to_bch2_time(c, current_time(&inode->v));
return 0;
}
static int bch2_ioc_getflags(struct bch_inode_info *inode, int __user *arg)
{
unsigned flags = map_flags(bch_flags_to_uflags, inode->ei_inode.bi_flags);
return put_user(flags, arg);
}
static int bch2_ioc_setflags(struct bch_fs *c,
struct file *file,
struct bch_inode_info *inode,
void __user *arg)
{
struct flags_set s = { .mask = map_defined(bch_flags_to_uflags) };
unsigned uflags;
int ret;
if (get_user(uflags, (int __user *) arg))
return -EFAULT;
s.flags = map_flags_rev(bch_flags_to_uflags, uflags);
if (uflags)
return -EOPNOTSUPP;
ret = mnt_want_write_file(file);
if (ret)
return ret;
inode_lock(&inode->v);
if (!inode_owner_or_capable(file_mnt_idmap(file), &inode->v)) {
ret = -EACCES;
goto setflags_out;
}
mutex_lock(&inode->ei_update_lock);
ret = bch2_write_inode(c, inode, bch2_inode_flags_set, &s,
ATTR_CTIME);
mutex_unlock(&inode->ei_update_lock);
setflags_out:
inode_unlock(&inode->v);
mnt_drop_write_file(file);
return ret;
}
static int bch2_ioc_fsgetxattr(struct bch_inode_info *inode,
struct fsxattr __user *arg)
{
struct fsxattr fa = { 0 };
fa.fsx_xflags = map_flags(bch_flags_to_xflags, inode->ei_inode.bi_flags);
fa.fsx_projid = inode->ei_qid.q[QTYP_PRJ];
return copy_to_user(arg, &fa, sizeof(fa));
}
static int bch2_set_projid(struct bch_fs *c,
struct bch_inode_info *inode,
u32 projid)
{
struct bch_qid qid = inode->ei_qid;
int ret;
if (projid == inode->ei_qid.q[QTYP_PRJ])
return 0;
qid.q[QTYP_PRJ] = projid;
return bch2_quota_transfer(c, 1 << QTYP_PRJ, qid, inode->ei_qid,
inode->v.i_blocks +
inode->ei_quota_reserved);
if (ret)
return ret;
inode->ei_qid.q[QTYP_PRJ] = projid;
return 0;
}
static int fssetxattr_inode_update_fn(struct bch_inode_info *inode,
struct bch_inode_unpacked *bi,
void *p)
{
struct flags_set *s = p;
bi->bi_project = s->projid;
return bch2_inode_flags_set(inode, bi, p);
}
static int bch2_ioc_fssetxattr(struct bch_fs *c,
struct file *file,
struct bch_inode_info *inode,
struct fsxattr __user *arg)
{
struct flags_set s = { .mask = map_defined(bch_flags_to_xflags) };
struct fsxattr fa;
int ret;
if (copy_from_user(&fa, arg, sizeof(fa)))
return -EFAULT;
s.flags = map_flags_rev(bch_flags_to_xflags, fa.fsx_xflags);
if (fa.fsx_xflags)
return -EOPNOTSUPP;
s.projid = fa.fsx_projid;
ret = mnt_want_write_file(file);
if (ret)
return ret;
inode_lock(&inode->v);
if (!inode_owner_or_capable(file_mnt_idmap(file), &inode->v)) {
ret = -EACCES;
goto err;
}
mutex_lock(&inode->ei_update_lock);
ret = bch2_set_projid(c, inode, fa.fsx_projid);
if (ret)
goto err_unlock;
ret = bch2_write_inode(c, inode, fssetxattr_inode_update_fn, &s,
ATTR_CTIME);
err_unlock:
mutex_unlock(&inode->ei_update_lock);
err:
inode_unlock(&inode->v);
mnt_drop_write_file(file);
return ret;
}
long bch2_fs_file_ioctl(struct file *file, unsigned cmd, unsigned long arg)
{
struct bch_inode_info *inode = file_bch_inode(file);
struct super_block *sb = inode->v.i_sb;
struct bch_fs *c = sb->s_fs_info;
switch (cmd) {
case FS_IOC_GETFLAGS:
return bch2_ioc_getflags(inode, (int __user *) arg);
case FS_IOC_SETFLAGS:
return bch2_ioc_setflags(c, file, inode, (int __user *) arg);
case FS_IOC_FSGETXATTR:
return bch2_ioc_fsgetxattr(inode, (void __user *) arg);
case FS_IOC_FSSETXATTR:
return bch2_ioc_fssetxattr(c, file, inode, (void __user *) arg);
case FS_IOC_GETVERSION:
return -ENOTTY;
case FS_IOC_SETVERSION:
return -ENOTTY;
case FS_IOC_GOINGDOWN:
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
down_write(&sb->s_umount);
sb->s_flags |= SB_RDONLY;
bch2_fs_emergency_read_only(c);
up_write(&sb->s_umount);
return 0;
default:
return bch2_fs_ioctl(c, cmd, (void __user *) arg);
}
}
#ifdef CONFIG_COMPAT
long bch2_compat_fs_ioctl(struct file *file, unsigned cmd, unsigned long arg)
{
/* These are just misnamed, they actually get/put from/to user an int */
switch (cmd) {
case FS_IOC_GETFLAGS:
cmd = FS_IOC_GETFLAGS;
break;
case FS_IOC32_SETFLAGS:
cmd = FS_IOC_SETFLAGS;
break;
default:
return -ENOIOCTLCMD;
}
return bch2_fs_file_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
}
#endif
#endif /* NO_BCACHEFS_FS */
|