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// SPDX-License-Identifier: GPL-2.0
#ifndef NO_BCACHEFS_FS
#include "bcachefs.h"
#include "chardev.h"
#include "dirent.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 fssetxattr_inode_update_fn(struct bch_inode_info *inode,
struct bch_inode_unpacked *bi,
void *p)
{
struct flags_set *s = p;
if (s->projid != bi->bi_project) {
bi->bi_fields_set |= 1U << Inode_opt_project;
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;
if (fa.fsx_projid >= U32_MAX)
return -EINVAL;
s.projid = fa.fsx_projid + 1;
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, s.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;
}
static int bch2_ioc_reinherit_attrs(struct bch_fs *c,
struct file *file,
struct bch_inode_info *src,
const char __user *name)
{
struct bch_inode_info *dst;
struct inode *vinode = NULL;
char *kname = NULL;
struct qstr qstr;
int ret = 0;
u64 inum;
kname = kmalloc(BCH_NAME_MAX + 1, GFP_KERNEL);
if (!kname)
return -ENOMEM;
ret = strncpy_from_user(kname, name, BCH_NAME_MAX);
if (unlikely(ret < 0))
goto err1;
qstr.len = ret;
qstr.name = kname;
ret = -ENOENT;
inum = bch2_dirent_lookup(c, src->v.i_ino,
&src->ei_str_hash,
&qstr);
if (!inum)
goto err1;
vinode = bch2_vfs_inode_get(c, inum);
ret = PTR_ERR_OR_ZERO(vinode);
if (ret)
goto err1;
dst = to_bch_ei(vinode);
ret = mnt_want_write_file(file);
if (ret)
goto err2;
bch2_lock_inodes(INODE_UPDATE_LOCK, src, dst);
if (inode_attr_changing(src, dst, Inode_opt_project)) {
ret = bch2_fs_quota_transfer(c, dst,
src->ei_qid,
1 << QTYP_PRJ,
KEY_TYPE_QUOTA_PREALLOC);
if (ret)
goto err3;
}
ret = bch2_write_inode(c, dst, bch2_reinherit_attrs_fn, src, 0);
err3:
bch2_unlock_inodes(INODE_UPDATE_LOCK, src, dst);
/* return true if we did work */
if (ret >= 0)
ret = !ret;
mnt_drop_write_file(file);
err2:
iput(vinode);
err1:
kfree(kname);
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 BCHFS_IOC_REINHERIT_ATTRS:
return bch2_ioc_reinherit_attrs(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;
if (bch2_fs_emergency_read_only(c))
bch_err(c, "emergency read only due to ioctl");
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 */
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