Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 978 insertions, 0 deletions

diff --git a/fs/ioctl.c b/fs/ioctl.c
new file mode 100644
index 000000000..2bd055092
--- /dev/null
+++ b/fs/ioctl.c
@@ -0,0 +1,978 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  linux/fs/ioctl.c
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ */
+
+#include <linux/syscalls.h>
+#include <linux/mm.h>
+#include <linux/capability.h>
+#include <linux/compat.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/security.h>
+#include <linux/export.h>
+#include <linux/uaccess.h>
+#include <linux/writeback.h>
+#include <linux/buffer_head.h>
+#include <linux/falloc.h>
+#include <linux/sched/signal.h>
+#include <linux/fiemap.h>
+#include <linux/mount.h>
+#include <linux/fscrypt.h>
+#include <linux/fileattr.h>
+
+#include "internal.h"
+
+#include <asm/ioctls.h>
+
+/* So that the fiemap access checks can't overflow on 32 bit machines. */
+#define FIEMAP_MAX_EXTENTS	(UINT_MAX / sizeof(struct fiemap_extent))
+
+/**
+ * vfs_ioctl - call filesystem specific ioctl methods
+ * @filp:	open file to invoke ioctl method on
+ * @cmd:	ioctl command to execute
+ * @arg:	command-specific argument for ioctl
+ *
+ * Invokes filesystem specific ->unlocked_ioctl, if one exists; otherwise
+ * returns -ENOTTY.
+ *
+ * Returns 0 on success, -errno on error.
+ */
+long vfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+	int error = -ENOTTY;
+
+	if (!filp->f_op->unlocked_ioctl)
+		goto out;
+
+	error = filp->f_op->unlocked_ioctl(filp, cmd, arg);
+	if (error == -ENOIOCTLCMD)
+		error = -ENOTTY;
+ out:
+	return error;
+}
+EXPORT_SYMBOL(vfs_ioctl);
+
+static int ioctl_fibmap(struct file *filp, int __user *p)
+{
+	struct inode *inode = file_inode(filp);
+	struct super_block *sb = inode->i_sb;
+	int error, ur_block;
+	sector_t block;
+
+	if (!capable(CAP_SYS_RAWIO))
+		return -EPERM;
+
+	error = get_user(ur_block, p);
+	if (error)
+		return error;
+
+	if (ur_block < 0)
+		return -EINVAL;
+
+	block = ur_block;
+	error = bmap(inode, &block);
+
+	if (block > INT_MAX) {
+		error = -ERANGE;
+		pr_warn_ratelimited("[%s/%d] FS: %s File: %pD4 would truncate fibmap result\n",
+				    current->comm, task_pid_nr(current),
+				    sb->s_id, filp);
+	}
+
+	if (error)
+		ur_block = 0;
+	else
+		ur_block = block;
+
+	if (put_user(ur_block, p))
+		error = -EFAULT;
+
+	return error;
+}
+
+/**
+ * fiemap_fill_next_extent - Fiemap helper function
+ * @fieinfo:	Fiemap context passed into ->fiemap
+ * @logical:	Extent logical start offset, in bytes
+ * @phys:	Extent physical start offset, in bytes
+ * @len:	Extent length, in bytes
+ * @flags:	FIEMAP_EXTENT flags that describe this extent
+ *
+ * Called from file system ->fiemap callback. Will populate extent
+ * info as passed in via arguments and copy to user memory. On
+ * success, extent count on fieinfo is incremented.
+ *
+ * Returns 0 on success, -errno on error, 1 if this was the last
+ * extent that will fit in user array.
+ */
+#define SET_UNKNOWN_FLAGS	(FIEMAP_EXTENT_DELALLOC)
+#define SET_NO_UNMOUNTED_IO_FLAGS	(FIEMAP_EXTENT_DATA_ENCRYPTED)
+#define SET_NOT_ALIGNED_FLAGS	(FIEMAP_EXTENT_DATA_TAIL|FIEMAP_EXTENT_DATA_INLINE)
+int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical,
+			    u64 phys, u64 len, u32 flags)
+{
+	struct fiemap_extent extent;
+	struct fiemap_extent __user *dest = fieinfo->fi_extents_start;
+
+	/* only count the extents */
+	if (fieinfo->fi_extents_max == 0) {
+		fieinfo->fi_extents_mapped++;
+		return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
+	}
+
+	if (fieinfo->fi_extents_mapped >= fieinfo->fi_extents_max)
+		return 1;
+
+	if (flags & SET_UNKNOWN_FLAGS)
+		flags |= FIEMAP_EXTENT_UNKNOWN;
+	if (flags & SET_NO_UNMOUNTED_IO_FLAGS)
+		flags |= FIEMAP_EXTENT_ENCODED;
+	if (flags & SET_NOT_ALIGNED_FLAGS)
+		flags |= FIEMAP_EXTENT_NOT_ALIGNED;
+
+	memset(&extent, 0, sizeof(extent));
+	extent.fe_logical = logical;
+	extent.fe_physical = phys;
+	extent.fe_length = len;
+	extent.fe_flags = flags;
+
+	dest += fieinfo->fi_extents_mapped;
+	if (copy_to_user(dest, &extent, sizeof(extent)))
+		return -EFAULT;
+
+	fieinfo->fi_extents_mapped++;
+	if (fieinfo->fi_extents_mapped == fieinfo->fi_extents_max)
+		return 1;
+	return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
+}
+EXPORT_SYMBOL(fiemap_fill_next_extent);
+
+/**
+ * fiemap_prep - check validity of requested flags for fiemap
+ * @inode:	Inode to operate on
+ * @fieinfo:	Fiemap context passed into ->fiemap
+ * @start:	Start of the mapped range
+ * @len:	Length of the mapped range, can be truncated by this function.
+ * @supported_flags:	Set of fiemap flags that the file system understands
+ *
+ * This function must be called from each ->fiemap instance to validate the
+ * fiemap request against the file system parameters.
+ *
+ * Returns 0 on success, or a negative error on failure.
+ */
+int fiemap_prep(struct inode *inode, struct fiemap_extent_info *fieinfo,
+		u64 start, u64 *len, u32 supported_flags)
+{
+	u64 maxbytes = inode->i_sb->s_maxbytes;
+	u32 incompat_flags;
+	int ret = 0;
+
+	if (*len == 0)
+		return -EINVAL;
+	if (start >= maxbytes)
+		return -EFBIG;
+
+	/*
+	 * Shrink request scope to what the fs can actually handle.
+	 */
+	if (*len > maxbytes || (maxbytes - *len) < start)
+		*len = maxbytes - start;
+
+	supported_flags |= FIEMAP_FLAG_SYNC;
+	supported_flags &= FIEMAP_FLAGS_COMPAT;
+	incompat_flags = fieinfo->fi_flags & ~supported_flags;
+	if (incompat_flags) {
+		fieinfo->fi_flags = incompat_flags;
+		return -EBADR;
+	}
+
+	if (fieinfo->fi_flags & FIEMAP_FLAG_SYNC)
+		ret = filemap_write_and_wait(inode->i_mapping);
+	return ret;
+}
+EXPORT_SYMBOL(fiemap_prep);
+
+static int ioctl_fiemap(struct file *filp, struct fiemap __user *ufiemap)
+{
+	struct fiemap fiemap;
+	struct fiemap_extent_info fieinfo = { 0, };
+	struct inode *inode = file_inode(filp);
+	int error;
+
+	if (!inode->i_op->fiemap)
+		return -EOPNOTSUPP;
+
+	if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
+		return -EFAULT;
+
+	if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
+		return -EINVAL;
+
+	fieinfo.fi_flags = fiemap.fm_flags;
+	fieinfo.fi_extents_max = fiemap.fm_extent_count;
+	fieinfo.fi_extents_start = ufiemap->fm_extents;
+
+	error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start,
+			fiemap.fm_length);
+
+	fiemap.fm_flags = fieinfo.fi_flags;
+	fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
+	if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
+		error = -EFAULT;
+
+	return error;
+}
+
+static long ioctl_file_clone(struct file *dst_file, unsigned long srcfd,
+			     u64 off, u64 olen, u64 destoff)
+{
+	struct fd src_file = fdget(srcfd);
+	loff_t cloned;
+	int ret;
+
+	if (!src_file.file)
+		return -EBADF;
+	cloned = vfs_clone_file_range(src_file.file, off, dst_file, destoff,
+				      olen, 0);
+	if (cloned < 0)
+		ret = cloned;
+	else if (olen && cloned != olen)
+		ret = -EINVAL;
+	else
+		ret = 0;
+	fdput(src_file);
+	return ret;
+}
+
+static long ioctl_file_clone_range(struct file *file,
+				   struct file_clone_range __user *argp)
+{
+	struct file_clone_range args;
+
+	if (copy_from_user(&args, argp, sizeof(args)))
+		return -EFAULT;
+	return ioctl_file_clone(file, args.src_fd, args.src_offset,
+				args.src_length, args.dest_offset);
+}
+
+/*
+ * This provides compatibility with legacy XFS pre-allocation ioctls
+ * which predate the fallocate syscall.
+ *
+ * Only the l_start, l_len and l_whence fields of the 'struct space_resv'
+ * are used here, rest are ignored.
+ */
+static int ioctl_preallocate(struct file *filp, int mode, void __user *argp)
+{
+	struct inode *inode = file_inode(filp);
+	struct space_resv sr;
+
+	if (copy_from_user(&sr, argp, sizeof(sr)))
+		return -EFAULT;
+
+	switch (sr.l_whence) {
+	case SEEK_SET:
+		break;
+	case SEEK_CUR:
+		sr.l_start += filp->f_pos;
+		break;
+	case SEEK_END:
+		sr.l_start += i_size_read(inode);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return vfs_fallocate(filp, mode | FALLOC_FL_KEEP_SIZE, sr.l_start,
+			sr.l_len);
+}
+
+/* on ia32 l_start is on a 32-bit boundary */
+#if defined CONFIG_COMPAT && defined(CONFIG_X86_64)
+/* just account for different alignment */
+static int compat_ioctl_preallocate(struct file *file, int mode,
+				    struct space_resv_32 __user *argp)
+{
+	struct inode *inode = file_inode(file);
+	struct space_resv_32 sr;
+
+	if (copy_from_user(&sr, argp, sizeof(sr)))
+		return -EFAULT;
+
+	switch (sr.l_whence) {
+	case SEEK_SET:
+		break;
+	case SEEK_CUR:
+		sr.l_start += file->f_pos;
+		break;
+	case SEEK_END:
+		sr.l_start += i_size_read(inode);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return vfs_fallocate(file, mode | FALLOC_FL_KEEP_SIZE, sr.l_start, sr.l_len);
+}
+#endif
+
+static int file_ioctl(struct file *filp, unsigned int cmd, int __user *p)
+{
+	switch (cmd) {
+	case FIBMAP:
+		return ioctl_fibmap(filp, p);
+	case FS_IOC_RESVSP:
+	case FS_IOC_RESVSP64:
+		return ioctl_preallocate(filp, 0, p);
+	case FS_IOC_UNRESVSP:
+	case FS_IOC_UNRESVSP64:
+		return ioctl_preallocate(filp, FALLOC_FL_PUNCH_HOLE, p);
+	case FS_IOC_ZERO_RANGE:
+		return ioctl_preallocate(filp, FALLOC_FL_ZERO_RANGE, p);
+	}
+
+	return -ENOIOCTLCMD;
+}
+
+static int ioctl_fionbio(struct file *filp, int __user *argp)
+{
+	unsigned int flag;
+	int on, error;
+
+	error = get_user(on, argp);
+	if (error)
+		return error;
+	flag = O_NONBLOCK;
+#ifdef __sparc__
+	/* SunOS compatibility item. */
+	if (O_NONBLOCK != O_NDELAY)
+		flag |= O_NDELAY;
+#endif
+	spin_lock(&filp->f_lock);
+	if (on)
+		filp->f_flags |= flag;
+	else
+		filp->f_flags &= ~flag;
+	spin_unlock(&filp->f_lock);
+	return error;
+}
+
+static int ioctl_fioasync(unsigned int fd, struct file *filp,
+			  int __user *argp)
+{
+	unsigned int flag;
+	int on, error;
+
+	error = get_user(on, argp);
+	if (error)
+		return error;
+	flag = on ? FASYNC : 0;
+
+	/* Did FASYNC state change ? */
+	if ((flag ^ filp->f_flags) & FASYNC) {
+		if (filp->f_op->fasync)
+			/* fasync() adjusts filp->f_flags */
+			error = filp->f_op->fasync(fd, filp, on);
+		else
+			error = -ENOTTY;
+	}
+	return error < 0 ? error : 0;
+}
+
+static int ioctl_fsfreeze(struct file *filp)
+{
+	struct super_block *sb = file_inode(filp)->i_sb;
+
+	if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN))
+		return -EPERM;
+
+	/* If filesystem doesn't support freeze feature, return. */
+	if (sb->s_op->freeze_fs == NULL && sb->s_op->freeze_super == NULL)
+		return -EOPNOTSUPP;
+
+	/* Freeze */
+	if (sb->s_op->freeze_super)
+		return sb->s_op->freeze_super(sb);
+	return freeze_super(sb);
+}
+
+static int ioctl_fsthaw(struct file *filp)
+{
+	struct super_block *sb = file_inode(filp)->i_sb;
+
+	if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN))
+		return -EPERM;
+
+	/* Thaw */
+	if (sb->s_op->thaw_super)
+		return sb->s_op->thaw_super(sb);
+	return thaw_super(sb);
+}
+
+static int ioctl_file_dedupe_range(struct file *file,
+				   struct file_dedupe_range __user *argp)
+{
+	struct file_dedupe_range *same = NULL;
+	int ret;
+	unsigned long size;
+	u16 count;
+
+	if (get_user(count, &argp->dest_count)) {
+		ret = -EFAULT;
+		goto out;
+	}
+
+	size = offsetof(struct file_dedupe_range, info[count]);
+	if (size > PAGE_SIZE) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	same = memdup_user(argp, size);
+	if (IS_ERR(same)) {
+		ret = PTR_ERR(same);
+		same = NULL;
+		goto out;
+	}
+
+	same->dest_count = count;
+	ret = vfs_dedupe_file_range(file, same);
+	if (ret)
+		goto out;
+
+	ret = copy_to_user(argp, same, size);
+	if (ret)
+		ret = -EFAULT;
+
+out:
+	kfree(same);
+	return ret;
+}
+
+/**
+ * fileattr_fill_xflags - initialize fileattr with xflags
+ * @fa:		fileattr pointer
+ * @xflags:	FS_XFLAG_* flags
+ *
+ * Set ->fsx_xflags, ->fsx_valid and ->flags (translated xflags).  All
+ * other fields are zeroed.
+ */
+void fileattr_fill_xflags(struct fileattr *fa, u32 xflags)
+{
+	memset(fa, 0, sizeof(*fa));
+	fa->fsx_valid = true;
+	fa->fsx_xflags = xflags;
+	if (fa->fsx_xflags & FS_XFLAG_IMMUTABLE)
+		fa->flags |= FS_IMMUTABLE_FL;
+	if (fa->fsx_xflags & FS_XFLAG_APPEND)
+		fa->flags |= FS_APPEND_FL;
+	if (fa->fsx_xflags & FS_XFLAG_SYNC)
+		fa->flags |= FS_SYNC_FL;
+	if (fa->fsx_xflags & FS_XFLAG_NOATIME)
+		fa->flags |= FS_NOATIME_FL;
+	if (fa->fsx_xflags & FS_XFLAG_NODUMP)
+		fa->flags |= FS_NODUMP_FL;
+	if (fa->fsx_xflags & FS_XFLAG_DAX)
+		fa->flags |= FS_DAX_FL;
+	if (fa->fsx_xflags & FS_XFLAG_PROJINHERIT)
+		fa->flags |= FS_PROJINHERIT_FL;
+}
+EXPORT_SYMBOL(fileattr_fill_xflags);
+
+/**
+ * fileattr_fill_flags - initialize fileattr with flags
+ * @fa:		fileattr pointer
+ * @flags:	FS_*_FL flags
+ *
+ * Set ->flags, ->flags_valid and ->fsx_xflags (translated flags).
+ * All other fields are zeroed.
+ */
+void fileattr_fill_flags(struct fileattr *fa, u32 flags)
+{
+	memset(fa, 0, sizeof(*fa));
+	fa->flags_valid = true;
+	fa->flags = flags;
+	if (fa->flags & FS_SYNC_FL)
+		fa->fsx_xflags |= FS_XFLAG_SYNC;
+	if (fa->flags & FS_IMMUTABLE_FL)
+		fa->fsx_xflags |= FS_XFLAG_IMMUTABLE;
+	if (fa->flags & FS_APPEND_FL)
+		fa->fsx_xflags |= FS_XFLAG_APPEND;
+	if (fa->flags & FS_NODUMP_FL)
+		fa->fsx_xflags |= FS_XFLAG_NODUMP;
+	if (fa->flags & FS_NOATIME_FL)
+		fa->fsx_xflags |= FS_XFLAG_NOATIME;
+	if (fa->flags & FS_DAX_FL)
+		fa->fsx_xflags |= FS_XFLAG_DAX;
+	if (fa->flags & FS_PROJINHERIT_FL)
+		fa->fsx_xflags |= FS_XFLAG_PROJINHERIT;
+}
+EXPORT_SYMBOL(fileattr_fill_flags);
+
+/**
+ * vfs_fileattr_get - retrieve miscellaneous file attributes
+ * @dentry:	the object to retrieve from
+ * @fa:		fileattr pointer
+ *
+ * Call i_op->fileattr_get() callback, if exists.
+ *
+ * Return: 0 on success, or a negative error on failure.
+ */
+int vfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
+{
+	struct inode *inode = d_inode(dentry);
+
+	if (!inode->i_op->fileattr_get)
+		return -ENOIOCTLCMD;
+
+	return inode->i_op->fileattr_get(dentry, fa);
+}
+EXPORT_SYMBOL(vfs_fileattr_get);
+
+/**
+ * copy_fsxattr_to_user - copy fsxattr to userspace.
+ * @fa:		fileattr pointer
+ * @ufa:	fsxattr user pointer
+ *
+ * Return: 0 on success, or -EFAULT on failure.
+ */
+int copy_fsxattr_to_user(const struct fileattr *fa, struct fsxattr __user *ufa)
+{
+	struct fsxattr xfa;
+
+	memset(&xfa, 0, sizeof(xfa));
+	xfa.fsx_xflags = fa->fsx_xflags;
+	xfa.fsx_extsize = fa->fsx_extsize;
+	xfa.fsx_nextents = fa->fsx_nextents;
+	xfa.fsx_projid = fa->fsx_projid;
+	xfa.fsx_cowextsize = fa->fsx_cowextsize;
+
+	if (copy_to_user(ufa, &xfa, sizeof(xfa)))
+		return -EFAULT;
+
+	return 0;
+}
+EXPORT_SYMBOL(copy_fsxattr_to_user);
+
+static int copy_fsxattr_from_user(struct fileattr *fa,
+				  struct fsxattr __user *ufa)
+{
+	struct fsxattr xfa;
+
+	if (copy_from_user(&xfa, ufa, sizeof(xfa)))
+		return -EFAULT;
+
+	fileattr_fill_xflags(fa, xfa.fsx_xflags);
+	fa->fsx_extsize = xfa.fsx_extsize;
+	fa->fsx_nextents = xfa.fsx_nextents;
+	fa->fsx_projid = xfa.fsx_projid;
+	fa->fsx_cowextsize = xfa.fsx_cowextsize;
+
+	return 0;
+}
+
+/*
+ * Generic function to check FS_IOC_FSSETXATTR/FS_IOC_SETFLAGS values and reject
+ * any invalid configurations.
+ *
+ * Note: must be called with inode lock held.
+ */
+static int fileattr_set_prepare(struct inode *inode,
+			      const struct fileattr *old_ma,
+			      struct fileattr *fa)
+{
+	int err;
+
+	/*
+	 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
+	 * the relevant capability.
+	 */
+	if ((fa->flags ^ old_ma->flags) & (FS_APPEND_FL | FS_IMMUTABLE_FL) &&
+	    !capable(CAP_LINUX_IMMUTABLE))
+		return -EPERM;
+
+	err = fscrypt_prepare_setflags(inode, old_ma->flags, fa->flags);
+	if (err)
+		return err;
+
+	/*
+	 * Project Quota ID state is only allowed to change from within the init
+	 * namespace. Enforce that restriction only if we are trying to change
+	 * the quota ID state. Everything else is allowed in user namespaces.
+	 */
+	if (current_user_ns() != &init_user_ns) {
+		if (old_ma->fsx_projid != fa->fsx_projid)
+			return -EINVAL;
+		if ((old_ma->fsx_xflags ^ fa->fsx_xflags) &
+				FS_XFLAG_PROJINHERIT)
+			return -EINVAL;
+	} else {
+		/*
+		 * Caller is allowed to change the project ID. If it is being
+		 * changed, make sure that the new value is valid.
+		 */
+		if (old_ma->fsx_projid != fa->fsx_projid &&
+		    !projid_valid(make_kprojid(&init_user_ns, fa->fsx_projid)))
+			return -EINVAL;
+	}
+
+	/* Check extent size hints. */
+	if ((fa->fsx_xflags & FS_XFLAG_EXTSIZE) && !S_ISREG(inode->i_mode))
+		return -EINVAL;
+
+	if ((fa->fsx_xflags & FS_XFLAG_EXTSZINHERIT) &&
+			!S_ISDIR(inode->i_mode))
+		return -EINVAL;
+
+	if ((fa->fsx_xflags & FS_XFLAG_COWEXTSIZE) &&
+	    !S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
+		return -EINVAL;
+
+	/*
+	 * It is only valid to set the DAX flag on regular files and
+	 * directories on filesystems.
+	 */
+	if ((fa->fsx_xflags & FS_XFLAG_DAX) &&
+	    !(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)))
+		return -EINVAL;
+
+	/* Extent size hints of zero turn off the flags. */
+	if (fa->fsx_extsize == 0)
+		fa->fsx_xflags &= ~(FS_XFLAG_EXTSIZE | FS_XFLAG_EXTSZINHERIT);
+	if (fa->fsx_cowextsize == 0)
+		fa->fsx_xflags &= ~FS_XFLAG_COWEXTSIZE;
+
+	return 0;
+}
+
+/**
+ * vfs_fileattr_set - change miscellaneous file attributes
+ * @mnt_userns:	user namespace of the mount
+ * @dentry:	the object to change
+ * @fa:		fileattr pointer
+ *
+ * After verifying permissions, call i_op->fileattr_set() callback, if
+ * exists.
+ *
+ * Verifying attributes involves retrieving current attributes with
+ * i_op->fileattr_get(), this also allows initializing attributes that have
+ * not been set by the caller to current values.  Inode lock is held
+ * thoughout to prevent racing with another instance.
+ *
+ * Return: 0 on success, or a negative error on failure.
+ */
+int vfs_fileattr_set(struct user_namespace *mnt_userns, struct dentry *dentry,
+		     struct fileattr *fa)
+{
+	struct inode *inode = d_inode(dentry);
+	struct fileattr old_ma = {};
+	int err;
+
+	if (!inode->i_op->fileattr_set)
+		return -ENOIOCTLCMD;
+
+	if (!inode_owner_or_capable(mnt_userns, inode))
+		return -EPERM;
+
+	inode_lock(inode);
+	err = vfs_fileattr_get(dentry, &old_ma);
+	if (!err) {
+		/* initialize missing bits from old_ma */
+		if (fa->flags_valid) {
+			fa->fsx_xflags |= old_ma.fsx_xflags & ~FS_XFLAG_COMMON;
+			fa->fsx_extsize = old_ma.fsx_extsize;
+			fa->fsx_nextents = old_ma.fsx_nextents;
+			fa->fsx_projid = old_ma.fsx_projid;
+			fa->fsx_cowextsize = old_ma.fsx_cowextsize;
+		} else {
+			fa->flags |= old_ma.flags & ~FS_COMMON_FL;
+		}
+		err = fileattr_set_prepare(inode, &old_ma, fa);
+		if (!err)
+			err = inode->i_op->fileattr_set(mnt_userns, dentry, fa);
+	}
+	inode_unlock(inode);
+
+	return err;
+}
+EXPORT_SYMBOL(vfs_fileattr_set);
+
+static int ioctl_getflags(struct file *file, unsigned int __user *argp)
+{
+	struct fileattr fa = { .flags_valid = true }; /* hint only */
+	int err;
+
+	err = vfs_fileattr_get(file->f_path.dentry, &fa);
+	if (!err)
+		err = put_user(fa.flags, argp);
+	return err;
+}
+
+static int ioctl_setflags(struct file *file, unsigned int __user *argp)
+{
+	struct user_namespace *mnt_userns = file_mnt_user_ns(file);
+	struct dentry *dentry = file->f_path.dentry;
+	struct fileattr fa;
+	unsigned int flags;
+	int err;
+
+	err = get_user(flags, argp);
+	if (!err) {
+		err = mnt_want_write_file(file);
+		if (!err) {
+			fileattr_fill_flags(&fa, flags);
+			err = vfs_fileattr_set(mnt_userns, dentry, &fa);
+			mnt_drop_write_file(file);
+		}
+	}
+	return err;
+}
+
+static int ioctl_fsgetxattr(struct file *file, void __user *argp)
+{
+	struct fileattr fa = { .fsx_valid = true }; /* hint only */
+	int err;
+
+	err = vfs_fileattr_get(file->f_path.dentry, &fa);
+	if (!err)
+		err = copy_fsxattr_to_user(&fa, argp);
+
+	return err;
+}
+
+static int ioctl_fssetxattr(struct file *file, void __user *argp)
+{
+	struct user_namespace *mnt_userns = file_mnt_user_ns(file);
+	struct dentry *dentry = file->f_path.dentry;
+	struct fileattr fa;
+	int err;
+
+	err = copy_fsxattr_from_user(&fa, argp);
+	if (!err) {
+		err = mnt_want_write_file(file);
+		if (!err) {
+			err = vfs_fileattr_set(mnt_userns, dentry, &fa);
+			mnt_drop_write_file(file);
+		}
+	}
+	return err;
+}
+
+/*
+ * do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
+ * It's just a simple helper for sys_ioctl and compat_sys_ioctl.
+ *
+ * When you add any new common ioctls to the switches above and below,
+ * please ensure they have compatible arguments in compat mode.
+ */
+static int do_vfs_ioctl(struct file *filp, unsigned int fd,
+			unsigned int cmd, unsigned long arg)
+{
+	void __user *argp = (void __user *)arg;
+	struct inode *inode = file_inode(filp);
+
+	switch (cmd) {
+	case FIOCLEX:
+		set_close_on_exec(fd, 1);
+		return 0;
+
+	case FIONCLEX:
+		set_close_on_exec(fd, 0);
+		return 0;
+
+	case FIONBIO:
+		return ioctl_fionbio(filp, argp);
+
+	case FIOASYNC:
+		return ioctl_fioasync(fd, filp, argp);
+
+	case FIOQSIZE:
+		if (S_ISDIR(inode->i_mode) || S_ISREG(inode->i_mode) ||
+		    S_ISLNK(inode->i_mode)) {
+			loff_t res = inode_get_bytes(inode);
+			return copy_to_user(argp, &res, sizeof(res)) ?
+					    -EFAULT : 0;
+		}
+
+		return -ENOTTY;
+
+	case FIFREEZE:
+		return ioctl_fsfreeze(filp);
+
+	case FITHAW:
+		return ioctl_fsthaw(filp);
+
+	case FS_IOC_FIEMAP:
+		return ioctl_fiemap(filp, argp);
+
+	case FIGETBSZ:
+		/* anon_bdev filesystems may not have a block size */
+		if (!inode->i_sb->s_blocksize)
+			return -EINVAL;
+
+		return put_user(inode->i_sb->s_blocksize, (int __user *)argp);
+
+	case FICLONE:
+		return ioctl_file_clone(filp, arg, 0, 0, 0);
+
+	case FICLONERANGE:
+		return ioctl_file_clone_range(filp, argp);
+
+	case FIDEDUPERANGE:
+		return ioctl_file_dedupe_range(filp, argp);
+
+	case FIONREAD:
+		if (!S_ISREG(inode->i_mode))
+			return vfs_ioctl(filp, cmd, arg);
+
+		return put_user(i_size_read(inode) - filp->f_pos,
+				(int __user *)argp);
+
+	case FS_IOC_GETFLAGS:
+		return ioctl_getflags(filp, argp);
+
+	case FS_IOC_SETFLAGS:
+		return ioctl_setflags(filp, argp);
+
+	case FS_IOC_FSGETXATTR:
+		return ioctl_fsgetxattr(filp, argp);
+
+	case FS_IOC_FSSETXATTR:
+		return ioctl_fssetxattr(filp, argp);
+
+	default:
+		if (S_ISREG(inode->i_mode))
+			return file_ioctl(filp, cmd, argp);
+		break;
+	}
+
+	return -ENOIOCTLCMD;
+}
+
+SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, unsigned long, arg)
+{
+	struct fd f = fdget(fd);
+	int error;
+
+	if (!f.file)
+		return -EBADF;
+
+	error = security_file_ioctl(f.file, cmd, arg);
+	if (error)
+		goto out;
+
+	error = do_vfs_ioctl(f.file, fd, cmd, arg);
+	if (error == -ENOIOCTLCMD)
+		error = vfs_ioctl(f.file, cmd, arg);
+
+out:
+	fdput(f);
+	return error;
+}
+
+#ifdef CONFIG_COMPAT
+/**
+ * compat_ptr_ioctl - generic implementation of .compat_ioctl file operation
+ *
+ * This is not normally called as a function, but instead set in struct
+ * file_operations as
+ *
+ *     .compat_ioctl = compat_ptr_ioctl,
+ *
+ * On most architectures, the compat_ptr_ioctl() just passes all arguments
+ * to the corresponding ->ioctl handler. The exception is arch/s390, where
+ * compat_ptr() clears the top bit of a 32-bit pointer value, so user space
+ * pointers to the second 2GB alias the first 2GB, as is the case for
+ * native 32-bit s390 user space.
+ *
+ * The compat_ptr_ioctl() function must therefore be used only with ioctl
+ * functions that either ignore the argument or pass a pointer to a
+ * compatible data type.
+ *
+ * If any ioctl command handled by fops->unlocked_ioctl passes a plain
+ * integer instead of a pointer, or any of the passed data types
+ * is incompatible between 32-bit and 64-bit architectures, a proper
+ * handler is required instead of compat_ptr_ioctl.
+ */
+long compat_ptr_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	if (!file->f_op->unlocked_ioctl)
+		return -ENOIOCTLCMD;
+
+	return file->f_op->unlocked_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
+}
+EXPORT_SYMBOL(compat_ptr_ioctl);
+
+COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd,
+		       compat_ulong_t, arg)
+{
+	struct fd f = fdget(fd);
+	int error;
+
+	if (!f.file)
+		return -EBADF;
+
+	error = security_file_ioctl_compat(f.file, cmd, arg);
+	if (error)
+		goto out;
+
+	switch (cmd) {
+	/* FICLONE takes an int argument, so don't use compat_ptr() */
+	case FICLONE:
+		error = ioctl_file_clone(f.file, arg, 0, 0, 0);
+		break;
+
+#if defined(CONFIG_X86_64)
+	/* these get messy on amd64 due to alignment differences */
+	case FS_IOC_RESVSP_32:
+	case FS_IOC_RESVSP64_32:
+		error = compat_ioctl_preallocate(f.file, 0, compat_ptr(arg));
+		break;
+	case FS_IOC_UNRESVSP_32:
+	case FS_IOC_UNRESVSP64_32:
+		error = compat_ioctl_preallocate(f.file, FALLOC_FL_PUNCH_HOLE,
+				compat_ptr(arg));
+		break;
+	case FS_IOC_ZERO_RANGE_32:
+		error = compat_ioctl_preallocate(f.file, FALLOC_FL_ZERO_RANGE,
+				compat_ptr(arg));
+		break;
+#endif
+
+	/*
+	 * These access 32-bit values anyway so no further handling is
+	 * necessary.
+	 */
+	case FS_IOC32_GETFLAGS:
+	case FS_IOC32_SETFLAGS:
+		cmd = (cmd == FS_IOC32_GETFLAGS) ?
+			FS_IOC_GETFLAGS : FS_IOC_SETFLAGS;
+		fallthrough;
+	/*
+	 * everything else in do_vfs_ioctl() takes either a compatible
+	 * pointer argument or no argument -- call it with a modified
+	 * argument.
+	 */
+	default:
+		error = do_vfs_ioctl(f.file, fd, cmd,
+				     (unsigned long)compat_ptr(arg));
+		if (error != -ENOIOCTLCMD)
+			break;
+
+		if (f.file->f_op->compat_ioctl)
+			error = f.file->f_op->compat_ioctl(f.file, cmd, arg);
+		if (error == -ENOIOCTLCMD)
+			error = -ENOTTY;
+		break;
+	}
+
+ out:
+	fdput(f);
+
+	return error;
+}
+#endif