Adding upstream version 6.1.76.upstream/6.1.76

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

1 files changed, 1334 insertions, 0 deletions

diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
new file mode 100644
index 000000000..2e10e1c66
--- /dev/null
+++ b/fs/xfs/xfs_iops.c
@@ -0,0 +1,1334 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2000-2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_shared.h"
+#include "xfs_format.h"
+#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
+#include "xfs_inode.h"
+#include "xfs_acl.h"
+#include "xfs_quota.h"
+#include "xfs_da_format.h"
+#include "xfs_da_btree.h"
+#include "xfs_attr.h"
+#include "xfs_trans.h"
+#include "xfs_trace.h"
+#include "xfs_icache.h"
+#include "xfs_symlink.h"
+#include "xfs_dir2.h"
+#include "xfs_iomap.h"
+#include "xfs_error.h"
+#include "xfs_ioctl.h"
+#include "xfs_xattr.h"
+
+#include <linux/posix_acl.h>
+#include <linux/security.h>
+#include <linux/iversion.h>
+#include <linux/fiemap.h>
+
+/*
+ * Directories have different lock order w.r.t. mmap_lock compared to regular
+ * files. This is due to readdir potentially triggering page faults on a user
+ * buffer inside filldir(), and this happens with the ilock on the directory
+ * held. For regular files, the lock order is the other way around - the
+ * mmap_lock is taken during the page fault, and then we lock the ilock to do
+ * block mapping. Hence we need a different class for the directory ilock so
+ * that lockdep can tell them apart.
+ */
+static struct lock_class_key xfs_nondir_ilock_class;
+static struct lock_class_key xfs_dir_ilock_class;
+
+static int
+xfs_initxattrs(
+	struct inode		*inode,
+	const struct xattr	*xattr_array,
+	void			*fs_info)
+{
+	const struct xattr	*xattr;
+	struct xfs_inode	*ip = XFS_I(inode);
+	int			error = 0;
+
+	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
+		struct xfs_da_args	args = {
+			.dp		= ip,
+			.attr_filter	= XFS_ATTR_SECURE,
+			.name		= xattr->name,
+			.namelen	= strlen(xattr->name),
+			.value		= xattr->value,
+			.valuelen	= xattr->value_len,
+		};
+		error = xfs_attr_change(&args);
+		if (error < 0)
+			break;
+	}
+	return error;
+}
+
+/*
+ * Hook in SELinux.  This is not quite correct yet, what we really need
+ * here (as we do for default ACLs) is a mechanism by which creation of
+ * these attrs can be journalled at inode creation time (along with the
+ * inode, of course, such that log replay can't cause these to be lost).
+ */
+int
+xfs_inode_init_security(
+	struct inode	*inode,
+	struct inode	*dir,
+	const struct qstr *qstr)
+{
+	return security_inode_init_security(inode, dir, qstr,
+					     &xfs_initxattrs, NULL);
+}
+
+static void
+xfs_dentry_to_name(
+	struct xfs_name	*namep,
+	struct dentry	*dentry)
+{
+	namep->name = dentry->d_name.name;
+	namep->len = dentry->d_name.len;
+	namep->type = XFS_DIR3_FT_UNKNOWN;
+}
+
+static int
+xfs_dentry_mode_to_name(
+	struct xfs_name	*namep,
+	struct dentry	*dentry,
+	int		mode)
+{
+	namep->name = dentry->d_name.name;
+	namep->len = dentry->d_name.len;
+	namep->type = xfs_mode_to_ftype(mode);
+
+	if (unlikely(namep->type == XFS_DIR3_FT_UNKNOWN))
+		return -EFSCORRUPTED;
+
+	return 0;
+}
+
+STATIC void
+xfs_cleanup_inode(
+	struct inode	*dir,
+	struct inode	*inode,
+	struct dentry	*dentry)
+{
+	struct xfs_name	teardown;
+
+	/* Oh, the horror.
+	 * If we can't add the ACL or we fail in
+	 * xfs_inode_init_security we must back out.
+	 * ENOSPC can hit here, among other things.
+	 */
+	xfs_dentry_to_name(&teardown, dentry);
+
+	xfs_remove(XFS_I(dir), &teardown, XFS_I(inode));
+}
+
+/*
+ * Check to see if we are likely to need an extended attribute to be added to
+ * the inode we are about to allocate. This allows the attribute fork to be
+ * created during the inode allocation, reducing the number of transactions we
+ * need to do in this fast path.
+ *
+ * The security checks are optimistic, but not guaranteed. The two LSMs that
+ * require xattrs to be added here (selinux and smack) are also the only two
+ * LSMs that add a sb->s_security structure to the superblock. Hence if security
+ * is enabled and sb->s_security is set, we have a pretty good idea that we are
+ * going to be asked to add a security xattr immediately after allocating the
+ * xfs inode and instantiating the VFS inode.
+ */
+static inline bool
+xfs_create_need_xattr(
+	struct inode	*dir,
+	struct posix_acl *default_acl,
+	struct posix_acl *acl)
+{
+	if (acl)
+		return true;
+	if (default_acl)
+		return true;
+#if IS_ENABLED(CONFIG_SECURITY)
+	if (dir->i_sb->s_security)
+		return true;
+#endif
+	return false;
+}
+
+
+STATIC int
+xfs_generic_create(
+	struct user_namespace	*mnt_userns,
+	struct inode	*dir,
+	struct dentry	*dentry,
+	umode_t		mode,
+	dev_t		rdev,
+	struct file	*tmpfile)	/* unnamed file */
+{
+	struct inode	*inode;
+	struct xfs_inode *ip = NULL;
+	struct posix_acl *default_acl, *acl;
+	struct xfs_name	name;
+	int		error;
+
+	/*
+	 * Irix uses Missed'em'V split, but doesn't want to see
+	 * the upper 5 bits of (14bit) major.
+	 */
+	if (S_ISCHR(mode) || S_ISBLK(mode)) {
+		if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
+			return -EINVAL;
+	} else {
+		rdev = 0;
+	}
+
+	error = posix_acl_create(dir, &mode, &default_acl, &acl);
+	if (error)
+		return error;
+
+	/* Verify mode is valid also for tmpfile case */
+	error = xfs_dentry_mode_to_name(&name, dentry, mode);
+	if (unlikely(error))
+		goto out_free_acl;
+
+	if (!tmpfile) {
+		error = xfs_create(mnt_userns, XFS_I(dir), &name, mode, rdev,
+				xfs_create_need_xattr(dir, default_acl, acl),
+				&ip);
+	} else {
+		error = xfs_create_tmpfile(mnt_userns, XFS_I(dir), mode, &ip);
+	}
+	if (unlikely(error))
+		goto out_free_acl;
+
+	inode = VFS_I(ip);
+
+	error = xfs_inode_init_security(inode, dir, &dentry->d_name);
+	if (unlikely(error))
+		goto out_cleanup_inode;
+
+	if (default_acl) {
+		error = __xfs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
+		if (error)
+			goto out_cleanup_inode;
+	}
+	if (acl) {
+		error = __xfs_set_acl(inode, acl, ACL_TYPE_ACCESS);
+		if (error)
+			goto out_cleanup_inode;
+	}
+
+	xfs_setup_iops(ip);
+
+	if (tmpfile) {
+		/*
+		 * The VFS requires that any inode fed to d_tmpfile must have
+		 * nlink == 1 so that it can decrement the nlink in d_tmpfile.
+		 * However, we created the temp file with nlink == 0 because
+		 * we're not allowed to put an inode with nlink > 0 on the
+		 * unlinked list.  Therefore we have to set nlink to 1 so that
+		 * d_tmpfile can immediately set it back to zero.
+		 */
+		set_nlink(inode, 1);
+		d_tmpfile(tmpfile, inode);
+	} else
+		d_instantiate(dentry, inode);
+
+	xfs_finish_inode_setup(ip);
+
+ out_free_acl:
+	posix_acl_release(default_acl);
+	posix_acl_release(acl);
+	return error;
+
+ out_cleanup_inode:
+	xfs_finish_inode_setup(ip);
+	if (!tmpfile)
+		xfs_cleanup_inode(dir, inode, dentry);
+	xfs_irele(ip);
+	goto out_free_acl;
+}
+
+STATIC int
+xfs_vn_mknod(
+	struct user_namespace	*mnt_userns,
+	struct inode		*dir,
+	struct dentry		*dentry,
+	umode_t			mode,
+	dev_t			rdev)
+{
+	return xfs_generic_create(mnt_userns, dir, dentry, mode, rdev, NULL);
+}
+
+STATIC int
+xfs_vn_create(
+	struct user_namespace	*mnt_userns,
+	struct inode		*dir,
+	struct dentry		*dentry,
+	umode_t			mode,
+	bool			flags)
+{
+	return xfs_generic_create(mnt_userns, dir, dentry, mode, 0, NULL);
+}
+
+STATIC int
+xfs_vn_mkdir(
+	struct user_namespace	*mnt_userns,
+	struct inode		*dir,
+	struct dentry		*dentry,
+	umode_t			mode)
+{
+	return xfs_generic_create(mnt_userns, dir, dentry, mode | S_IFDIR, 0,
+				  NULL);
+}
+
+STATIC struct dentry *
+xfs_vn_lookup(
+	struct inode	*dir,
+	struct dentry	*dentry,
+	unsigned int flags)
+{
+	struct inode *inode;
+	struct xfs_inode *cip;
+	struct xfs_name	name;
+	int		error;
+
+	if (dentry->d_name.len >= MAXNAMELEN)
+		return ERR_PTR(-ENAMETOOLONG);
+
+	xfs_dentry_to_name(&name, dentry);
+	error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
+	if (likely(!error))
+		inode = VFS_I(cip);
+	else if (likely(error == -ENOENT))
+		inode = NULL;
+	else
+		inode = ERR_PTR(error);
+	return d_splice_alias(inode, dentry);
+}
+
+STATIC struct dentry *
+xfs_vn_ci_lookup(
+	struct inode	*dir,
+	struct dentry	*dentry,
+	unsigned int flags)
+{
+	struct xfs_inode *ip;
+	struct xfs_name	xname;
+	struct xfs_name ci_name;
+	struct qstr	dname;
+	int		error;
+
+	if (dentry->d_name.len >= MAXNAMELEN)
+		return ERR_PTR(-ENAMETOOLONG);
+
+	xfs_dentry_to_name(&xname, dentry);
+	error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
+	if (unlikely(error)) {
+		if (unlikely(error != -ENOENT))
+			return ERR_PTR(error);
+		/*
+		 * call d_add(dentry, NULL) here when d_drop_negative_children
+		 * is called in xfs_vn_mknod (ie. allow negative dentries
+		 * with CI filesystems).
+		 */
+		return NULL;
+	}
+
+	/* if exact match, just splice and exit */
+	if (!ci_name.name)
+		return d_splice_alias(VFS_I(ip), dentry);
+
+	/* else case-insensitive match... */
+	dname.name = ci_name.name;
+	dname.len = ci_name.len;
+	dentry = d_add_ci(dentry, VFS_I(ip), &dname);
+	kmem_free(ci_name.name);
+	return dentry;
+}
+
+STATIC int
+xfs_vn_link(
+	struct dentry	*old_dentry,
+	struct inode	*dir,
+	struct dentry	*dentry)
+{
+	struct inode	*inode = d_inode(old_dentry);
+	struct xfs_name	name;
+	int		error;
+
+	error = xfs_dentry_mode_to_name(&name, dentry, inode->i_mode);
+	if (unlikely(error))
+		return error;
+
+	error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
+	if (unlikely(error))
+		return error;
+
+	ihold(inode);
+	d_instantiate(dentry, inode);
+	return 0;
+}
+
+STATIC int
+xfs_vn_unlink(
+	struct inode	*dir,
+	struct dentry	*dentry)
+{
+	struct xfs_name	name;
+	int		error;
+
+	xfs_dentry_to_name(&name, dentry);
+
+	error = xfs_remove(XFS_I(dir), &name, XFS_I(d_inode(dentry)));
+	if (error)
+		return error;
+
+	/*
+	 * With unlink, the VFS makes the dentry "negative": no inode,
+	 * but still hashed. This is incompatible with case-insensitive
+	 * mode, so invalidate (unhash) the dentry in CI-mode.
+	 */
+	if (xfs_has_asciici(XFS_M(dir->i_sb)))
+		d_invalidate(dentry);
+	return 0;
+}
+
+STATIC int
+xfs_vn_symlink(
+	struct user_namespace	*mnt_userns,
+	struct inode		*dir,
+	struct dentry		*dentry,
+	const char		*symname)
+{
+	struct inode	*inode;
+	struct xfs_inode *cip = NULL;
+	struct xfs_name	name;
+	int		error;
+	umode_t		mode;
+
+	mode = S_IFLNK |
+		(irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
+	error = xfs_dentry_mode_to_name(&name, dentry, mode);
+	if (unlikely(error))
+		goto out;
+
+	error = xfs_symlink(mnt_userns, XFS_I(dir), &name, symname, mode, &cip);
+	if (unlikely(error))
+		goto out;
+
+	inode = VFS_I(cip);
+
+	error = xfs_inode_init_security(inode, dir, &dentry->d_name);
+	if (unlikely(error))
+		goto out_cleanup_inode;
+
+	xfs_setup_iops(cip);
+
+	d_instantiate(dentry, inode);
+	xfs_finish_inode_setup(cip);
+	return 0;
+
+ out_cleanup_inode:
+	xfs_finish_inode_setup(cip);
+	xfs_cleanup_inode(dir, inode, dentry);
+	xfs_irele(cip);
+ out:
+	return error;
+}
+
+STATIC int
+xfs_vn_rename(
+	struct user_namespace	*mnt_userns,
+	struct inode		*odir,
+	struct dentry		*odentry,
+	struct inode		*ndir,
+	struct dentry		*ndentry,
+	unsigned int		flags)
+{
+	struct inode	*new_inode = d_inode(ndentry);
+	int		omode = 0;
+	int		error;
+	struct xfs_name	oname;
+	struct xfs_name	nname;
+
+	if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
+		return -EINVAL;
+
+	/* if we are exchanging files, we need to set i_mode of both files */
+	if (flags & RENAME_EXCHANGE)
+		omode = d_inode(ndentry)->i_mode;
+
+	error = xfs_dentry_mode_to_name(&oname, odentry, omode);
+	if (omode && unlikely(error))
+		return error;
+
+	error = xfs_dentry_mode_to_name(&nname, ndentry,
+					d_inode(odentry)->i_mode);
+	if (unlikely(error))
+		return error;
+
+	return xfs_rename(mnt_userns, XFS_I(odir), &oname,
+			  XFS_I(d_inode(odentry)), XFS_I(ndir), &nname,
+			  new_inode ? XFS_I(new_inode) : NULL, flags);
+}
+
+/*
+ * careful here - this function can get called recursively, so
+ * we need to be very careful about how much stack we use.
+ * uio is kmalloced for this reason...
+ */
+STATIC const char *
+xfs_vn_get_link(
+	struct dentry		*dentry,
+	struct inode		*inode,
+	struct delayed_call	*done)
+{
+	char			*link;
+	int			error = -ENOMEM;
+
+	if (!dentry)
+		return ERR_PTR(-ECHILD);
+
+	link = kmalloc(XFS_SYMLINK_MAXLEN+1, GFP_KERNEL);
+	if (!link)
+		goto out_err;
+
+	error = xfs_readlink(XFS_I(d_inode(dentry)), link);
+	if (unlikely(error))
+		goto out_kfree;
+
+	set_delayed_call(done, kfree_link, link);
+	return link;
+
+ out_kfree:
+	kfree(link);
+ out_err:
+	return ERR_PTR(error);
+}
+
+static uint32_t
+xfs_stat_blksize(
+	struct xfs_inode	*ip)
+{
+	struct xfs_mount	*mp = ip->i_mount;
+
+	/*
+	 * If the file blocks are being allocated from a realtime volume, then
+	 * always return the realtime extent size.
+	 */
+	if (XFS_IS_REALTIME_INODE(ip))
+		return XFS_FSB_TO_B(mp, xfs_get_extsz_hint(ip));
+
+	/*
+	 * Allow large block sizes to be reported to userspace programs if the
+	 * "largeio" mount option is used.
+	 *
+	 * If compatibility mode is specified, simply return the basic unit of
+	 * caching so that we don't get inefficient read/modify/write I/O from
+	 * user apps. Otherwise....
+	 *
+	 * If the underlying volume is a stripe, then return the stripe width in
+	 * bytes as the recommended I/O size. It is not a stripe and we've set a
+	 * default buffered I/O size, return that, otherwise return the compat
+	 * default.
+	 */
+	if (xfs_has_large_iosize(mp)) {
+		if (mp->m_swidth)
+			return XFS_FSB_TO_B(mp, mp->m_swidth);
+		if (xfs_has_allocsize(mp))
+			return 1U << mp->m_allocsize_log;
+	}
+
+	return PAGE_SIZE;
+}
+
+STATIC int
+xfs_vn_getattr(
+	struct user_namespace	*mnt_userns,
+	const struct path	*path,
+	struct kstat		*stat,
+	u32			request_mask,
+	unsigned int		query_flags)
+{
+	struct inode		*inode = d_inode(path->dentry);
+	struct xfs_inode	*ip = XFS_I(inode);
+	struct xfs_mount	*mp = ip->i_mount;
+	vfsuid_t		vfsuid = i_uid_into_vfsuid(mnt_userns, inode);
+	vfsgid_t		vfsgid = i_gid_into_vfsgid(mnt_userns, inode);
+
+	trace_xfs_getattr(ip);
+
+	if (xfs_is_shutdown(mp))
+		return -EIO;
+
+	stat->size = XFS_ISIZE(ip);
+	stat->dev = inode->i_sb->s_dev;
+	stat->mode = inode->i_mode;
+	stat->nlink = inode->i_nlink;
+	stat->uid = vfsuid_into_kuid(vfsuid);
+	stat->gid = vfsgid_into_kgid(vfsgid);
+	stat->ino = ip->i_ino;
+	stat->atime = inode->i_atime;
+	stat->mtime = inode->i_mtime;
+	stat->ctime = inode->i_ctime;
+	stat->blocks = XFS_FSB_TO_BB(mp, ip->i_nblocks + ip->i_delayed_blks);
+
+	if (xfs_has_v3inodes(mp)) {
+		if (request_mask & STATX_BTIME) {
+			stat->result_mask |= STATX_BTIME;
+			stat->btime = ip->i_crtime;
+		}
+	}
+
+	/*
+	 * Note: If you add another clause to set an attribute flag, please
+	 * update attributes_mask below.
+	 */
+	if (ip->i_diflags & XFS_DIFLAG_IMMUTABLE)
+		stat->attributes |= STATX_ATTR_IMMUTABLE;
+	if (ip->i_diflags & XFS_DIFLAG_APPEND)
+		stat->attributes |= STATX_ATTR_APPEND;
+	if (ip->i_diflags & XFS_DIFLAG_NODUMP)
+		stat->attributes |= STATX_ATTR_NODUMP;
+
+	stat->attributes_mask |= (STATX_ATTR_IMMUTABLE |
+				  STATX_ATTR_APPEND |
+				  STATX_ATTR_NODUMP);
+
+	switch (inode->i_mode & S_IFMT) {
+	case S_IFBLK:
+	case S_IFCHR:
+		stat->blksize = BLKDEV_IOSIZE;
+		stat->rdev = inode->i_rdev;
+		break;
+	case S_IFREG:
+		if (request_mask & STATX_DIOALIGN) {
+			struct xfs_buftarg	*target = xfs_inode_buftarg(ip);
+			struct block_device	*bdev = target->bt_bdev;
+
+			stat->result_mask |= STATX_DIOALIGN;
+			stat->dio_mem_align = bdev_dma_alignment(bdev) + 1;
+			stat->dio_offset_align = bdev_logical_block_size(bdev);
+		}
+		fallthrough;
+	default:
+		stat->blksize = xfs_stat_blksize(ip);
+		stat->rdev = 0;
+		break;
+	}
+
+	return 0;
+}
+
+static int
+xfs_vn_change_ok(
+	struct user_namespace	*mnt_userns,
+	struct dentry		*dentry,
+	struct iattr		*iattr)
+{
+	struct xfs_mount	*mp = XFS_I(d_inode(dentry))->i_mount;
+
+	if (xfs_is_readonly(mp))
+		return -EROFS;
+
+	if (xfs_is_shutdown(mp))
+		return -EIO;
+
+	return setattr_prepare(mnt_userns, dentry, iattr);
+}
+
+/*
+ * Set non-size attributes of an inode.
+ *
+ * Caution: The caller of this function is responsible for calling
+ * setattr_prepare() or otherwise verifying the change is fine.
+ */
+static int
+xfs_setattr_nonsize(
+	struct user_namespace	*mnt_userns,
+	struct xfs_inode	*ip,
+	struct iattr		*iattr)
+{
+	xfs_mount_t		*mp = ip->i_mount;
+	struct inode		*inode = VFS_I(ip);
+	int			mask = iattr->ia_valid;
+	xfs_trans_t		*tp;
+	int			error;
+	kuid_t			uid = GLOBAL_ROOT_UID;
+	kgid_t			gid = GLOBAL_ROOT_GID;
+	struct xfs_dquot	*udqp = NULL, *gdqp = NULL;
+	struct xfs_dquot	*old_udqp = NULL, *old_gdqp = NULL;
+
+	ASSERT((mask & ATTR_SIZE) == 0);
+
+	/*
+	 * If disk quotas is on, we make sure that the dquots do exist on disk,
+	 * before we start any other transactions. Trying to do this later
+	 * is messy. We don't care to take a readlock to look at the ids
+	 * in inode here, because we can't hold it across the trans_reserve.
+	 * If the IDs do change before we take the ilock, we're covered
+	 * because the i_*dquot fields will get updated anyway.
+	 */
+	if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
+		uint	qflags = 0;
+
+		if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
+			uid = from_vfsuid(mnt_userns, i_user_ns(inode),
+					  iattr->ia_vfsuid);
+			qflags |= XFS_QMOPT_UQUOTA;
+		} else {
+			uid = inode->i_uid;
+		}
+		if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
+			gid = from_vfsgid(mnt_userns, i_user_ns(inode),
+					  iattr->ia_vfsgid);
+			qflags |= XFS_QMOPT_GQUOTA;
+		}  else {
+			gid = inode->i_gid;
+		}
+
+		/*
+		 * We take a reference when we initialize udqp and gdqp,
+		 * so it is important that we never blindly double trip on
+		 * the same variable. See xfs_create() for an example.
+		 */
+		ASSERT(udqp == NULL);
+		ASSERT(gdqp == NULL);
+		error = xfs_qm_vop_dqalloc(ip, uid, gid, ip->i_projid,
+					   qflags, &udqp, &gdqp, NULL);
+		if (error)
+			return error;
+	}
+
+	error = xfs_trans_alloc_ichange(ip, udqp, gdqp, NULL,
+			has_capability_noaudit(current, CAP_FOWNER), &tp);
+	if (error)
+		goto out_dqrele;
+
+	/*
+	 * Register quota modifications in the transaction.  Must be the owner
+	 * or privileged.  These IDs could have changed since we last looked at
+	 * them.  But, we're assured that if the ownership did change while we
+	 * didn't have the inode locked, inode's dquot(s) would have changed
+	 * also.
+	 */
+	if (XFS_IS_UQUOTA_ON(mp) &&
+	    i_uid_needs_update(mnt_userns, iattr, inode)) {
+		ASSERT(udqp);
+		old_udqp = xfs_qm_vop_chown(tp, ip, &ip->i_udquot, udqp);
+	}
+	if (XFS_IS_GQUOTA_ON(mp) &&
+	    i_gid_needs_update(mnt_userns, iattr, inode)) {
+		ASSERT(xfs_has_pquotino(mp) || !XFS_IS_PQUOTA_ON(mp));
+		ASSERT(gdqp);
+		old_gdqp = xfs_qm_vop_chown(tp, ip, &ip->i_gdquot, gdqp);
+	}
+
+	setattr_copy(mnt_userns, inode, iattr);
+	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+
+	XFS_STATS_INC(mp, xs_ig_attrchg);
+
+	if (xfs_has_wsync(mp))
+		xfs_trans_set_sync(tp);
+	error = xfs_trans_commit(tp);
+
+	/*
+	 * Release any dquot(s) the inode had kept before chown.
+	 */
+	xfs_qm_dqrele(old_udqp);
+	xfs_qm_dqrele(old_gdqp);
+	xfs_qm_dqrele(udqp);
+	xfs_qm_dqrele(gdqp);
+
+	if (error)
+		return error;
+
+	/*
+	 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
+	 * 	     update.  We could avoid this with linked transactions
+	 * 	     and passing down the transaction pointer all the way
+	 *	     to attr_set.  No previous user of the generic
+	 * 	     Posix ACL code seems to care about this issue either.
+	 */
+	if (mask & ATTR_MODE) {
+		error = posix_acl_chmod(mnt_userns, inode, inode->i_mode);
+		if (error)
+			return error;
+	}
+
+	return 0;
+
+out_dqrele:
+	xfs_qm_dqrele(udqp);
+	xfs_qm_dqrele(gdqp);
+	return error;
+}
+
+/*
+ * Truncate file.  Must have write permission and not be a directory.
+ *
+ * Caution: The caller of this function is responsible for calling
+ * setattr_prepare() or otherwise verifying the change is fine.
+ */
+STATIC int
+xfs_setattr_size(
+	struct user_namespace	*mnt_userns,
+	struct xfs_inode	*ip,
+	struct iattr		*iattr)
+{
+	struct xfs_mount	*mp = ip->i_mount;
+	struct inode		*inode = VFS_I(ip);
+	xfs_off_t		oldsize, newsize;
+	struct xfs_trans	*tp;
+	int			error;
+	uint			lock_flags = 0;
+	bool			did_zeroing = false;
+
+	ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
+	ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL));
+	ASSERT(S_ISREG(inode->i_mode));
+	ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
+		ATTR_MTIME_SET|ATTR_TIMES_SET)) == 0);
+
+	oldsize = inode->i_size;
+	newsize = iattr->ia_size;
+
+	/*
+	 * Short circuit the truncate case for zero length files.
+	 */
+	if (newsize == 0 && oldsize == 0 && ip->i_df.if_nextents == 0) {
+		if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
+			return 0;
+
+		/*
+		 * Use the regular setattr path to update the timestamps.
+		 */
+		iattr->ia_valid &= ~ATTR_SIZE;
+		return xfs_setattr_nonsize(mnt_userns, ip, iattr);
+	}
+
+	/*
+	 * Make sure that the dquots are attached to the inode.
+	 */
+	error = xfs_qm_dqattach(ip);
+	if (error)
+		return error;
+
+	/*
+	 * Wait for all direct I/O to complete.
+	 */
+	inode_dio_wait(inode);
+
+	/*
+	 * File data changes must be complete before we start the transaction to
+	 * modify the inode.  This needs to be done before joining the inode to
+	 * the transaction because the inode cannot be unlocked once it is a
+	 * part of the transaction.
+	 *
+	 * Start with zeroing any data beyond EOF that we may expose on file
+	 * extension, or zeroing out the rest of the block on a downward
+	 * truncate.
+	 */
+	if (newsize > oldsize) {
+		trace_xfs_zero_eof(ip, oldsize, newsize - oldsize);
+		error = xfs_zero_range(ip, oldsize, newsize - oldsize,
+				&did_zeroing);
+	} else {
+		/*
+		 * iomap won't detect a dirty page over an unwritten block (or a
+		 * cow block over a hole) and subsequently skips zeroing the
+		 * newly post-EOF portion of the page. Flush the new EOF to
+		 * convert the block before the pagecache truncate.
+		 */
+		error = filemap_write_and_wait_range(inode->i_mapping, newsize,
+						     newsize);
+		if (error)
+			return error;
+		error = xfs_truncate_page(ip, newsize, &did_zeroing);
+	}
+
+	if (error)
+		return error;
+
+	/*
+	 * We've already locked out new page faults, so now we can safely remove
+	 * pages from the page cache knowing they won't get refaulted until we
+	 * drop the XFS_MMAP_EXCL lock after the extent manipulations are
+	 * complete. The truncate_setsize() call also cleans partial EOF page
+	 * PTEs on extending truncates and hence ensures sub-page block size
+	 * filesystems are correctly handled, too.
+	 *
+	 * We have to do all the page cache truncate work outside the
+	 * transaction context as the "lock" order is page lock->log space
+	 * reservation as defined by extent allocation in the writeback path.
+	 * Hence a truncate can fail with ENOMEM from xfs_trans_alloc(), but
+	 * having already truncated the in-memory version of the file (i.e. made
+	 * user visible changes). There's not much we can do about this, except
+	 * to hope that the caller sees ENOMEM and retries the truncate
+	 * operation.
+	 *
+	 * And we update in-core i_size and truncate page cache beyond newsize
+	 * before writeback the [i_disk_size, newsize] range, so we're
+	 * guaranteed not to write stale data past the new EOF on truncate down.
+	 */
+	truncate_setsize(inode, newsize);
+
+	/*
+	 * We are going to log the inode size change in this transaction so
+	 * any previous writes that are beyond the on disk EOF and the new
+	 * EOF that have not been written out need to be written here.  If we
+	 * do not write the data out, we expose ourselves to the null files
+	 * problem. Note that this includes any block zeroing we did above;
+	 * otherwise those blocks may not be zeroed after a crash.
+	 */
+	if (did_zeroing ||
+	    (newsize > ip->i_disk_size && oldsize != ip->i_disk_size)) {
+		error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
+						ip->i_disk_size, newsize - 1);
+		if (error)
+			return error;
+	}
+
+	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
+	if (error)
+		return error;
+
+	lock_flags |= XFS_ILOCK_EXCL;
+	xfs_ilock(ip, XFS_ILOCK_EXCL);
+	xfs_trans_ijoin(tp, ip, 0);
+
+	/*
+	 * Only change the c/mtime if we are changing the size or we are
+	 * explicitly asked to change it.  This handles the semantic difference
+	 * between truncate() and ftruncate() as implemented in the VFS.
+	 *
+	 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
+	 * special case where we need to update the times despite not having
+	 * these flags set.  For all other operations the VFS set these flags
+	 * explicitly if it wants a timestamp update.
+	 */
+	if (newsize != oldsize &&
+	    !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
+		iattr->ia_ctime = iattr->ia_mtime =
+			current_time(inode);
+		iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
+	}
+
+	/*
+	 * The first thing we do is set the size to new_size permanently on
+	 * disk.  This way we don't have to worry about anyone ever being able
+	 * to look at the data being freed even in the face of a crash.
+	 * What we're getting around here is the case where we free a block, it
+	 * is allocated to another file, it is written to, and then we crash.
+	 * If the new data gets written to the file but the log buffers
+	 * containing the free and reallocation don't, then we'd end up with
+	 * garbage in the blocks being freed.  As long as we make the new size
+	 * permanent before actually freeing any blocks it doesn't matter if
+	 * they get written to.
+	 */
+	ip->i_disk_size = newsize;
+	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+
+	if (newsize <= oldsize) {
+		error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
+		if (error)
+			goto out_trans_cancel;
+
+		/*
+		 * Truncated "down", so we're removing references to old data
+		 * here - if we delay flushing for a long time, we expose
+		 * ourselves unduly to the notorious NULL files problem.  So,
+		 * we mark this inode and flush it when the file is closed,
+		 * and do not wait the usual (long) time for writeout.
+		 */
+		xfs_iflags_set(ip, XFS_ITRUNCATED);
+
+		/* A truncate down always removes post-EOF blocks. */
+		xfs_inode_clear_eofblocks_tag(ip);
+	}
+
+	ASSERT(!(iattr->ia_valid & (ATTR_UID | ATTR_GID)));
+	setattr_copy(mnt_userns, inode, iattr);
+	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+
+	XFS_STATS_INC(mp, xs_ig_attrchg);
+
+	if (xfs_has_wsync(mp))
+		xfs_trans_set_sync(tp);
+
+	error = xfs_trans_commit(tp);
+out_unlock:
+	if (lock_flags)
+		xfs_iunlock(ip, lock_flags);
+	return error;
+
+out_trans_cancel:
+	xfs_trans_cancel(tp);
+	goto out_unlock;
+}
+
+int
+xfs_vn_setattr_size(
+	struct user_namespace	*mnt_userns,
+	struct dentry		*dentry,
+	struct iattr		*iattr)
+{
+	struct xfs_inode	*ip = XFS_I(d_inode(dentry));
+	int error;
+
+	trace_xfs_setattr(ip);
+
+	error = xfs_vn_change_ok(mnt_userns, dentry, iattr);
+	if (error)
+		return error;
+	return xfs_setattr_size(mnt_userns, ip, iattr);
+}
+
+STATIC int
+xfs_vn_setattr(
+	struct user_namespace	*mnt_userns,
+	struct dentry		*dentry,
+	struct iattr		*iattr)
+{
+	struct inode		*inode = d_inode(dentry);
+	struct xfs_inode	*ip = XFS_I(inode);
+	int			error;
+
+	if (iattr->ia_valid & ATTR_SIZE) {
+		uint			iolock;
+
+		xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
+		iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
+
+		error = xfs_break_layouts(inode, &iolock, BREAK_UNMAP);
+		if (error) {
+			xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
+			return error;
+		}
+
+		error = xfs_vn_setattr_size(mnt_userns, dentry, iattr);
+		xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
+	} else {
+		trace_xfs_setattr(ip);
+
+		error = xfs_vn_change_ok(mnt_userns, dentry, iattr);
+		if (!error)
+			error = xfs_setattr_nonsize(mnt_userns, ip, iattr);
+	}
+
+	return error;
+}
+
+STATIC int
+xfs_vn_update_time(
+	struct inode		*inode,
+	struct timespec64	*now,
+	int			flags)
+{
+	struct xfs_inode	*ip = XFS_I(inode);
+	struct xfs_mount	*mp = ip->i_mount;
+	int			log_flags = XFS_ILOG_TIMESTAMP;
+	struct xfs_trans	*tp;
+	int			error;
+
+	trace_xfs_update_time(ip);
+
+	if (inode->i_sb->s_flags & SB_LAZYTIME) {
+		if (!((flags & S_VERSION) &&
+		      inode_maybe_inc_iversion(inode, false)))
+			return generic_update_time(inode, now, flags);
+
+		/* Capture the iversion update that just occurred */
+		log_flags |= XFS_ILOG_CORE;
+	}
+
+	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);
+	if (error)
+		return error;
+
+	xfs_ilock(ip, XFS_ILOCK_EXCL);
+	if (flags & S_CTIME)
+		inode->i_ctime = *now;
+	if (flags & S_MTIME)
+		inode->i_mtime = *now;
+	if (flags & S_ATIME)
+		inode->i_atime = *now;
+
+	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
+	xfs_trans_log_inode(tp, ip, log_flags);
+	return xfs_trans_commit(tp);
+}
+
+STATIC int
+xfs_vn_fiemap(
+	struct inode		*inode,
+	struct fiemap_extent_info *fieinfo,
+	u64			start,
+	u64			length)
+{
+	int			error;
+
+	xfs_ilock(XFS_I(inode), XFS_IOLOCK_SHARED);
+	if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
+		fieinfo->fi_flags &= ~FIEMAP_FLAG_XATTR;
+		error = iomap_fiemap(inode, fieinfo, start, length,
+				&xfs_xattr_iomap_ops);
+	} else {
+		error = iomap_fiemap(inode, fieinfo, start, length,
+				&xfs_read_iomap_ops);
+	}
+	xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED);
+
+	return error;
+}
+
+STATIC int
+xfs_vn_tmpfile(
+	struct user_namespace	*mnt_userns,
+	struct inode		*dir,
+	struct file		*file,
+	umode_t			mode)
+{
+	int err = xfs_generic_create(mnt_userns, dir, file->f_path.dentry, mode, 0, file);
+
+	return finish_open_simple(file, err);
+}
+
+static const struct inode_operations xfs_inode_operations = {
+	.get_acl		= xfs_get_acl,
+	.set_acl		= xfs_set_acl,
+	.getattr		= xfs_vn_getattr,
+	.setattr		= xfs_vn_setattr,
+	.listxattr		= xfs_vn_listxattr,
+	.fiemap			= xfs_vn_fiemap,
+	.update_time		= xfs_vn_update_time,
+	.fileattr_get		= xfs_fileattr_get,
+	.fileattr_set		= xfs_fileattr_set,
+};
+
+static const struct inode_operations xfs_dir_inode_operations = {
+	.create			= xfs_vn_create,
+	.lookup			= xfs_vn_lookup,
+	.link			= xfs_vn_link,
+	.unlink			= xfs_vn_unlink,
+	.symlink		= xfs_vn_symlink,
+	.mkdir			= xfs_vn_mkdir,
+	/*
+	 * Yes, XFS uses the same method for rmdir and unlink.
+	 *
+	 * There are some subtile differences deeper in the code,
+	 * but we use S_ISDIR to check for those.
+	 */
+	.rmdir			= xfs_vn_unlink,
+	.mknod			= xfs_vn_mknod,
+	.rename			= xfs_vn_rename,
+	.get_acl		= xfs_get_acl,
+	.set_acl		= xfs_set_acl,
+	.getattr		= xfs_vn_getattr,
+	.setattr		= xfs_vn_setattr,
+	.listxattr		= xfs_vn_listxattr,
+	.update_time		= xfs_vn_update_time,
+	.tmpfile		= xfs_vn_tmpfile,
+	.fileattr_get		= xfs_fileattr_get,
+	.fileattr_set		= xfs_fileattr_set,
+};
+
+static const struct inode_operations xfs_dir_ci_inode_operations = {
+	.create			= xfs_vn_create,
+	.lookup			= xfs_vn_ci_lookup,
+	.link			= xfs_vn_link,
+	.unlink			= xfs_vn_unlink,
+	.symlink		= xfs_vn_symlink,
+	.mkdir			= xfs_vn_mkdir,
+	/*
+	 * Yes, XFS uses the same method for rmdir and unlink.
+	 *
+	 * There are some subtile differences deeper in the code,
+	 * but we use S_ISDIR to check for those.
+	 */
+	.rmdir			= xfs_vn_unlink,
+	.mknod			= xfs_vn_mknod,
+	.rename			= xfs_vn_rename,
+	.get_acl		= xfs_get_acl,
+	.set_acl		= xfs_set_acl,
+	.getattr		= xfs_vn_getattr,
+	.setattr		= xfs_vn_setattr,
+	.listxattr		= xfs_vn_listxattr,
+	.update_time		= xfs_vn_update_time,
+	.tmpfile		= xfs_vn_tmpfile,
+	.fileattr_get		= xfs_fileattr_get,
+	.fileattr_set		= xfs_fileattr_set,
+};
+
+static const struct inode_operations xfs_symlink_inode_operations = {
+	.get_link		= xfs_vn_get_link,
+	.getattr		= xfs_vn_getattr,
+	.setattr		= xfs_vn_setattr,
+	.listxattr		= xfs_vn_listxattr,
+	.update_time		= xfs_vn_update_time,
+};
+
+/* Figure out if this file actually supports DAX. */
+static bool
+xfs_inode_supports_dax(
+	struct xfs_inode	*ip)
+{
+	struct xfs_mount	*mp = ip->i_mount;
+
+	/* Only supported on regular files. */
+	if (!S_ISREG(VFS_I(ip)->i_mode))
+		return false;
+
+	/* Only supported on non-reflinked files. */
+	if (xfs_is_reflink_inode(ip))
+		return false;
+
+	/* Block size must match page size */
+	if (mp->m_sb.sb_blocksize != PAGE_SIZE)
+		return false;
+
+	/* Device has to support DAX too. */
+	return xfs_inode_buftarg(ip)->bt_daxdev != NULL;
+}
+
+static bool
+xfs_inode_should_enable_dax(
+	struct xfs_inode *ip)
+{
+	if (!IS_ENABLED(CONFIG_FS_DAX))
+		return false;
+	if (xfs_has_dax_never(ip->i_mount))
+		return false;
+	if (!xfs_inode_supports_dax(ip))
+		return false;
+	if (xfs_has_dax_always(ip->i_mount))
+		return true;
+	if (ip->i_diflags2 & XFS_DIFLAG2_DAX)
+		return true;
+	return false;
+}
+
+void
+xfs_diflags_to_iflags(
+	struct xfs_inode	*ip,
+	bool init)
+{
+	struct inode            *inode = VFS_I(ip);
+	unsigned int            xflags = xfs_ip2xflags(ip);
+	unsigned int            flags = 0;
+
+	ASSERT(!(IS_DAX(inode) && init));
+
+	if (xflags & FS_XFLAG_IMMUTABLE)
+		flags |= S_IMMUTABLE;
+	if (xflags & FS_XFLAG_APPEND)
+		flags |= S_APPEND;
+	if (xflags & FS_XFLAG_SYNC)
+		flags |= S_SYNC;
+	if (xflags & FS_XFLAG_NOATIME)
+		flags |= S_NOATIME;
+	if (init && xfs_inode_should_enable_dax(ip))
+		flags |= S_DAX;
+
+	/*
+	 * S_DAX can only be set during inode initialization and is never set by
+	 * the VFS, so we cannot mask off S_DAX in i_flags.
+	 */
+	inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC | S_NOATIME);
+	inode->i_flags |= flags;
+}
+
+/*
+ * Initialize the Linux inode.
+ *
+ * When reading existing inodes from disk this is called directly from xfs_iget,
+ * when creating a new inode it is called from xfs_init_new_inode after setting
+ * up the inode. These callers have different criteria for clearing XFS_INEW, so
+ * leave it up to the caller to deal with unlocking the inode appropriately.
+ */
+void
+xfs_setup_inode(
+	struct xfs_inode	*ip)
+{
+	struct inode		*inode = &ip->i_vnode;
+	gfp_t			gfp_mask;
+
+	inode->i_ino = ip->i_ino;
+	inode->i_state |= I_NEW;
+
+	inode_sb_list_add(inode);
+	/* make the inode look hashed for the writeback code */
+	inode_fake_hash(inode);
+
+	i_size_write(inode, ip->i_disk_size);
+	xfs_diflags_to_iflags(ip, true);
+
+	if (S_ISDIR(inode->i_mode)) {
+		/*
+		 * We set the i_rwsem class here to avoid potential races with
+		 * lockdep_annotate_inode_mutex_key() reinitialising the lock
+		 * after a filehandle lookup has already found the inode in
+		 * cache before it has been unlocked via unlock_new_inode().
+		 */
+		lockdep_set_class(&inode->i_rwsem,
+				  &inode->i_sb->s_type->i_mutex_dir_key);
+		lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class);
+	} else {
+		lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class);
+	}
+
+	/*
+	 * Ensure all page cache allocations are done from GFP_NOFS context to
+	 * prevent direct reclaim recursion back into the filesystem and blowing
+	 * stacks or deadlocking.
+	 */
+	gfp_mask = mapping_gfp_mask(inode->i_mapping);
+	mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
+
+	/*
+	 * If there is no attribute fork no ACL can exist on this inode,
+	 * and it can't have any file capabilities attached to it either.
+	 */
+	if (!xfs_inode_has_attr_fork(ip)) {
+		inode_has_no_xattr(inode);
+		cache_no_acl(inode);
+	}
+}
+
+void
+xfs_setup_iops(
+	struct xfs_inode	*ip)
+{
+	struct inode		*inode = &ip->i_vnode;
+
+	switch (inode->i_mode & S_IFMT) {
+	case S_IFREG:
+		inode->i_op = &xfs_inode_operations;
+		inode->i_fop = &xfs_file_operations;
+		if (IS_DAX(inode))
+			inode->i_mapping->a_ops = &xfs_dax_aops;
+		else
+			inode->i_mapping->a_ops = &xfs_address_space_operations;
+		break;
+	case S_IFDIR:
+		if (xfs_has_asciici(XFS_M(inode->i_sb)))
+			inode->i_op = &xfs_dir_ci_inode_operations;
+		else
+			inode->i_op = &xfs_dir_inode_operations;
+		inode->i_fop = &xfs_dir_file_operations;
+		break;
+	case S_IFLNK:
+		inode->i_op = &xfs_symlink_inode_operations;
+		break;
+	default:
+		inode->i_op = &xfs_inode_operations;
+		init_special_inode(inode, inode->i_mode, inode->i_rdev);
+		break;
+	}
+}