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#ifndef NO_BCACHEFS_FS
#include "bcachefs.h"
#include "chardev.h"
#include "fs.h"
#include "fs-ioctl.h"
#include <linux/compat.h>
#include <linux/mount.h>
#define FS_IOC_GOINGDOWN _IOR('X', 125, __u32)
/* Inode flags: */
/* bcachefs inode flags -> vfs inode flags: */
static const unsigned bch_flags_to_vfs[] = {
[__BCH_INODE_SYNC] = S_SYNC,
[__BCH_INODE_IMMUTABLE] = S_IMMUTABLE,
[__BCH_INODE_APPEND] = S_APPEND,
[__BCH_INODE_NOATIME] = S_NOATIME,
};
/* bcachefs inode flags -> FS_IOC_GETFLAGS: */
static const unsigned bch_flags_to_uflags[] = {
[__BCH_INODE_SYNC] = FS_SYNC_FL,
[__BCH_INODE_IMMUTABLE] = FS_IMMUTABLE_FL,
[__BCH_INODE_APPEND] = FS_APPEND_FL,
[__BCH_INODE_NODUMP] = FS_NODUMP_FL,
[__BCH_INODE_NOATIME] = FS_NOATIME_FL,
};
/* bcachefs inode flags -> FS_IOC_FSGETXATTR: */
static const unsigned bch_flags_to_xflags[] = {
[__BCH_INODE_SYNC] = FS_XFLAG_SYNC,
[__BCH_INODE_IMMUTABLE] = FS_XFLAG_IMMUTABLE,
[__BCH_INODE_APPEND] = FS_XFLAG_APPEND,
[__BCH_INODE_NODUMP] = FS_XFLAG_NODUMP,
[__BCH_INODE_NOATIME] = FS_XFLAG_NOATIME,
//[__BCH_INODE_PROJINHERIT] = FS_XFLAG_PROJINHERIT;
};
#define map_flags(_map, _in) \
({ \
unsigned _i, _out = 0; \
\
for (_i = 0; _i < ARRAY_SIZE(_map); _i++) \
if ((_in) & (1 << _i)) \
(_out) |= _map[_i]; \
(_out); \
})
#define map_flags_rev(_map, _in) \
({ \
unsigned _i, _out = 0; \
\
for (_i = 0; _i < ARRAY_SIZE(_map); _i++) \
if ((_in) & _map[_i]) { \
(_out) |= 1 << _i; \
(_in) &= ~_map[_i]; \
} \
(_out); \
})
#define set_flags(_map, _in, _out) \
do { \
unsigned _i; \
\
for (_i = 0; _i < ARRAY_SIZE(_map); _i++) \
if ((_in) & (1 << _i)) \
(_out) |= _map[_i]; \
else \
(_out) &= ~_map[_i]; \
} while (0)
/* Set VFS inode flags from bcachefs inode: */
void bch2_inode_flags_to_vfs(struct bch_inode_info *inode)
{
set_flags(bch_flags_to_vfs, inode->ei_inode.bi_flags, inode->v.i_flags);
}
static int bch2_inode_flags_set(struct bch_inode_info *inode,
struct bch_inode_unpacked *bi,
void *p)
{
/*
* We're relying on btree locking here for exclusion with other ioctl
* calls - use the flags in the btree (@bi), not inode->i_flags:
*/
unsigned newflags = *((unsigned *) p);
unsigned oldflags = bi->bi_flags;
if (((newflags ^ oldflags) & (BCH_INODE_APPEND|BCH_INODE_IMMUTABLE)) &&
!capable(CAP_LINUX_IMMUTABLE))
return -EPERM;
if (!S_ISREG(inode->v.i_mode) &&
!S_ISDIR(inode->v.i_mode) &&
(newflags & (BCH_INODE_NODUMP|BCH_INODE_NOATIME)) != newflags)
return -EINVAL;
bi->bi_flags = newflags;
inode->v.i_ctime = 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)
{
unsigned flags, uflags;
int ret;
if (get_user(uflags, (int __user *) arg))
return -EFAULT;
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(&inode->v)) {
ret = -EACCES;
goto setflags_out;
}
mutex_lock(&inode->ei_update_lock);
ret = __bch2_write_inode(c, inode, bch2_inode_flags_set, &flags);
if (!ret)
bch2_inode_flags_to_vfs(inode);
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);
return copy_to_user(arg, &fa, sizeof(fa));
}
static int bch2_ioc_fssetxattr(struct bch_fs *c,
struct file *file,
struct bch_inode_info *inode,
struct fsxattr __user *arg)
{
struct fsxattr fa;
unsigned flags;
int ret;
if (copy_from_user(&fa, arg, sizeof(fa)))
return -EFAULT;
flags = map_flags_rev(bch_flags_to_xflags, fa.fsx_xflags);
if (fa.fsx_xflags)
return -EOPNOTSUPP;
ret = mnt_want_write_file(file);
if (ret)
return ret;
inode_lock(&inode->v);
if (!inode_owner_or_capable(&inode->v)) {
ret = -EACCES;
goto err;
}
mutex_lock(&inode->ei_update_lock);
ret = __bch2_write_inode(c, inode, bch2_inode_flags_set, &flags);
if (!ret)
bch2_inode_flags_to_vfs(inode);
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 |= MS_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 */
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