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32 results

xfs_iops.c

Blame
    • Darrick J. Wong's avatar
      1fb254aa
      xfs: fix missing ILOCK unlock when xfs_setattr_nonsize fails due to EDQUOT · 1fb254aa
      Darrick J. Wong authored
      
      Benjamin Moody reported to Debian that XFS partially wedges when a chgrp
      fails on account of being out of disk quota.  I ran his reproducer
      script:
      
      # adduser dummy
      # adduser dummy plugdev
      
      # dd if=/dev/zero bs=1M count=100 of=test.img
      # mkfs.xfs test.img
      # mount -t xfs -o gquota test.img /mnt
      # mkdir -p /mnt/dummy
      # chown -c dummy /mnt/dummy
      # xfs_quota -xc 'limit -g bsoft=100k bhard=100k plugdev' /mnt
      
      (and then as user dummy)
      
      $ dd if=/dev/urandom bs=1M count=50 of=/mnt/dummy/foo
      $ chgrp plugdev /mnt/dummy/foo
      
      and saw:
      
      ================================================
      WARNING: lock held when returning to user space!
      5.3.0-rc5 #rc5 Tainted: G        W
      ------------------------------------------------
      chgrp/47006 is leaving the kernel with locks still held!
      1 lock held by chgrp/47006:
       #0: 000000006664ea2d (&xfs_nondir_ilock_class){++++}, at: xfs_ilock+0xd2/0x290 [xfs]
      
      ...which is clearly caused by xfs_setattr_nonsize failing to unlock the
      ILOCK after the xfs_qm_vop_chown_reserve call fails.  Add the missing
      unlock.
      
      Reported-by: default avatar <benjamin.moody@gmail.com>
      Fixes: 253f4911 ("xfs: better xfs_trans_alloc interface")
      Signed-off-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
      Reviewed-by: default avatarDave Chinner <dchinner@redhat.com>
      Tested-by: default avatarSalvatore Bonaccorso <carnil@debian.org>
      1fb254aa
      History
      xfs: fix missing ILOCK unlock when xfs_setattr_nonsize fails due to EDQUOT
      Darrick J. Wong authored
      
      Benjamin Moody reported to Debian that XFS partially wedges when a chgrp
      fails on account of being out of disk quota.  I ran his reproducer
      script:
      
      # adduser dummy
      # adduser dummy plugdev
      
      # dd if=/dev/zero bs=1M count=100 of=test.img
      # mkfs.xfs test.img
      # mount -t xfs -o gquota test.img /mnt
      # mkdir -p /mnt/dummy
      # chown -c dummy /mnt/dummy
      # xfs_quota -xc 'limit -g bsoft=100k bhard=100k plugdev' /mnt
      
      (and then as user dummy)
      
      $ dd if=/dev/urandom bs=1M count=50 of=/mnt/dummy/foo
      $ chgrp plugdev /mnt/dummy/foo
      
      and saw:
      
      ================================================
      WARNING: lock held when returning to user space!
      5.3.0-rc5 #rc5 Tainted: G        W
      ------------------------------------------------
      chgrp/47006 is leaving the kernel with locks still held!
      1 lock held by chgrp/47006:
       #0: 000000006664ea2d (&xfs_nondir_ilock_class){++++}, at: xfs_ilock+0xd2/0x290 [xfs]
      
      ...which is clearly caused by xfs_setattr_nonsize failing to unlock the
      ILOCK after the xfs_qm_vop_chown_reserve call fails.  Add the missing
      unlock.
      
      Reported-by: default avatar <benjamin.moody@gmail.com>
      Fixes: 253f4911 ("xfs: better xfs_trans_alloc interface")
      Signed-off-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
      Reviewed-by: default avatarDave Chinner <dchinner@redhat.com>
      Tested-by: default avatarSalvatore Bonaccorso <carnil@debian.org>
    xfs_iops.c 33.29 KiB
    // 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_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 <linux/xattr.h>
    #include <linux/posix_acl.h>
    #include <linux/security.h>
    #include <linux/iversion.h>
    
    /*
     * Directories have different lock order w.r.t. mmap_sem 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_sem 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++) {
    		error = xfs_attr_set(ip, xattr->name, xattr->value,
    				      xattr->value_len, ATTR_SECURE);
    		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).
     */
    
    STATIC int
    xfs_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_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));
    }
    
    STATIC int
    xfs_generic_create(
    	struct inode	*dir,
    	struct dentry	*dentry,
    	umode_t		mode,
    	dev_t		rdev,
    	bool		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(XFS_I(dir), &name, mode, rdev, &ip);
    	} else {
    		error = xfs_create_tmpfile(XFS_I(dir), mode, &ip);
    	}
    	if (unlikely(error))
    		goto out_free_acl;
    
    	inode = VFS_I(ip);
    
    	error = xfs_init_security(inode, dir, &dentry->d_name);
    	if (unlikely(error))
    		goto out_cleanup_inode;
    
    #ifdef CONFIG_XFS_POSIX_ACL
    	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;
    	}
    #endif
    
    	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(dentry, inode);
    	} else
    		d_instantiate(dentry, inode);
    
    	xfs_finish_inode_setup(ip);
    
     out_free_acl:
    	if (default_acl)
    		posix_acl_release(default_acl);
    	if (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 inode	*dir,
    	struct dentry	*dentry,
    	umode_t		mode,
    	dev_t		rdev)
    {
    	return xfs_generic_create(dir, dentry, mode, rdev, false);
    }
    
    STATIC int
    xfs_vn_create(
    	struct inode	*dir,
    	struct dentry	*dentry,
    	umode_t		mode,
    	bool		flags)
    {
    	return xfs_vn_mknod(dir, dentry, mode, 0);
    }
    
    STATIC int
    xfs_vn_mkdir(
    	struct inode	*dir,
    	struct dentry	*dentry,
    	umode_t		mode)
    {
    	return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0);
    }
    
    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_sb_version_hasasciici(&XFS_M(dir->i_sb)->m_sb))
    		d_invalidate(dentry);
    	return 0;
    }
    
    STATIC int
    xfs_vn_symlink(
    	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(XFS_I(dir), &name, symname, mode, &cip);
    	if (unlikely(error))
    		goto out;
    
    	inode = VFS_I(cip);
    
    	error = xfs_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 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(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 const char *
    xfs_vn_get_link_inline(
    	struct dentry		*dentry,
    	struct inode		*inode,
    	struct delayed_call	*done)
    {
    	char			*link;
    
    	ASSERT(XFS_I(inode)->i_df.if_flags & XFS_IFINLINE);
    
    	/*
    	 * The VFS crashes on a NULL pointer, so return -EFSCORRUPTED if
    	 * if_data is junk.
    	 */
    	link = XFS_I(inode)->i_df.if_u1.if_data;
    	if (!link)
    		return ERR_PTR(-EFSCORRUPTED);
    	return link;
    }
    
    STATIC int
    xfs_vn_getattr(
    	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;
    
    	trace_xfs_getattr(ip);
    
    	if (XFS_FORCED_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 = inode->i_uid;
    	stat->gid = inode->i_gid;
    	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_d.di_nblocks + ip->i_delayed_blks);
    
    	if (ip->i_d.di_version == 3) {
    		if (request_mask & STATX_BTIME) {
    			stat->result_mask |= STATX_BTIME;
    			stat->btime.tv_sec = ip->i_d.di_crtime.t_sec;
    			stat->btime.tv_nsec = ip->i_d.di_crtime.t_nsec;
    		}
    	}
    
    	/*
    	 * Note: If you add another clause to set an attribute flag, please
    	 * update attributes_mask below.
    	 */
    	if (ip->i_d.di_flags & XFS_DIFLAG_IMMUTABLE)
    		stat->attributes |= STATX_ATTR_IMMUTABLE;
    	if (ip->i_d.di_flags & XFS_DIFLAG_APPEND)
    		stat->attributes |= STATX_ATTR_APPEND;
    	if (ip->i_d.di_flags & 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;
    	default:
    		if (XFS_IS_REALTIME_INODE(ip)) {
    			/*
    			 * If the file blocks are being allocated from a
    			 * realtime volume, then return the inode's realtime
    			 * extent size or the realtime volume's extent size.
    			 */
    			stat->blksize =
    				xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog;
    		} else
    			stat->blksize = xfs_preferred_iosize(mp);
    		stat->rdev = 0;
    		break;
    	}
    
    	return 0;
    }
    
    static void
    xfs_setattr_mode(
    	struct xfs_inode	*ip,
    	struct iattr		*iattr)
    {
    	struct inode		*inode = VFS_I(ip);
    	umode_t			mode = iattr->ia_mode;
    
    	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
    
    	inode->i_mode &= S_IFMT;
    	inode->i_mode |= mode & ~S_IFMT;
    }
    
    void
    xfs_setattr_time(
    	struct xfs_inode	*ip,
    	struct iattr		*iattr)
    {
    	struct inode		*inode = VFS_I(ip);
    
    	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
    
    	if (iattr->ia_valid & ATTR_ATIME)
    		inode->i_atime = iattr->ia_atime;
    	if (iattr->ia_valid & ATTR_CTIME)
    		inode->i_ctime = iattr->ia_ctime;
    	if (iattr->ia_valid & ATTR_MTIME)
    		inode->i_mtime = iattr->ia_mtime;
    }
    
    static int
    xfs_vn_change_ok(
    	struct dentry	*dentry,
    	struct iattr	*iattr)
    {
    	struct xfs_mount	*mp = XFS_I(d_inode(dentry))->i_mount;
    
    	if (mp->m_flags & XFS_MOUNT_RDONLY)
    		return -EROFS;
    
    	if (XFS_FORCED_SHUTDOWN(mp))
    		return -EIO;
    
    	return setattr_prepare(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.
     */
    int
    xfs_setattr_nonsize(
    	struct xfs_inode	*ip,
    	struct iattr		*iattr,
    	int			flags)
    {
    	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, iuid = GLOBAL_ROOT_UID;
    	kgid_t			gid = GLOBAL_ROOT_GID, igid = GLOBAL_ROOT_GID;
    	struct xfs_dquot	*udqp = NULL, *gdqp = NULL;
    	struct xfs_dquot	*olddquot1 = NULL, *olddquot2 = 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 = iattr->ia_uid;
    			qflags |= XFS_QMOPT_UQUOTA;
    		} else {
    			uid = inode->i_uid;
    		}
    		if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
    			gid = iattr->ia_gid;
    			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, xfs_kuid_to_uid(uid),
    					   xfs_kgid_to_gid(gid),
    					   xfs_get_projid(ip),
    					   qflags, &udqp, &gdqp, NULL);
    		if (error)
    			return error;
    	}
    
    	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
    	if (error)
    		goto out_dqrele;
    
    	xfs_ilock(ip, XFS_ILOCK_EXCL);
    	xfs_trans_ijoin(tp, ip, 0);
    
    	/*
    	 * Change file ownership.  Must be the owner or privileged.
    	 */
    	if (mask & (ATTR_UID|ATTR_GID)) {
    		/*
    		 * 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.
    		 */
    		iuid = inode->i_uid;
    		igid = inode->i_gid;
    		gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
    		uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;
    
    		/*
    		 * Do a quota reservation only if uid/gid is actually
    		 * going to change.
    		 */
    		if (XFS_IS_QUOTA_RUNNING(mp) &&
    		    ((XFS_IS_UQUOTA_ON(mp) && !uid_eq(iuid, uid)) ||
    		     (XFS_IS_GQUOTA_ON(mp) && !gid_eq(igid, gid)))) {
    			ASSERT(tp);
    			error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
    						NULL, capable(CAP_FOWNER) ?
    						XFS_QMOPT_FORCE_RES : 0);
    			if (error)	/* out of quota */
    				goto out_cancel;
    		}
    	}
    
    	/*
    	 * Change file ownership.  Must be the owner or privileged.
    	 */
    	if (mask & (ATTR_UID|ATTR_GID)) {
    		/*
    		 * CAP_FSETID overrides the following restrictions:
    		 *
    		 * The set-user-ID and set-group-ID bits of a file will be
    		 * cleared upon successful return from chown()
    		 */
    		if ((inode->i_mode & (S_ISUID|S_ISGID)) &&
    		    !capable(CAP_FSETID))
    			inode->i_mode &= ~(S_ISUID|S_ISGID);
    
    		/*
    		 * Change the ownerships and register quota modifications
    		 * in the transaction.
    		 */
    		if (!uid_eq(iuid, uid)) {
    			if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) {
    				ASSERT(mask & ATTR_UID);
    				ASSERT(udqp);
    				olddquot1 = xfs_qm_vop_chown(tp, ip,
    							&ip->i_udquot, udqp);
    			}
    			ip->i_d.di_uid = xfs_kuid_to_uid(uid);
    			inode->i_uid = uid;
    		}
    		if (!gid_eq(igid, gid)) {
    			if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
    				ASSERT(xfs_sb_version_has_pquotino(&mp->m_sb) ||
    				       !XFS_IS_PQUOTA_ON(mp));
    				ASSERT(mask & ATTR_GID);
    				ASSERT(gdqp);
    				olddquot2 = xfs_qm_vop_chown(tp, ip,
    							&ip->i_gdquot, gdqp);
    			}
    			ip->i_d.di_gid = xfs_kgid_to_gid(gid);
    			inode->i_gid = gid;
    		}
    	}
    
    	if (mask & ATTR_MODE)
    		xfs_setattr_mode(ip, iattr);
    	if (mask & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
    		xfs_setattr_time(ip, iattr);
    
    	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
    
    	XFS_STATS_INC(mp, xs_ig_attrchg);
    
    	if (mp->m_flags & XFS_MOUNT_WSYNC)
    		xfs_trans_set_sync(tp);
    	error = xfs_trans_commit(tp);
    
    	xfs_iunlock(ip, XFS_ILOCK_EXCL);
    
    	/*
    	 * Release any dquot(s) the inode had kept before chown.
    	 */
    	xfs_qm_dqrele(olddquot1);
    	xfs_qm_dqrele(olddquot2);
    	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) && !(flags & XFS_ATTR_NOACL)) {
    		error = posix_acl_chmod(inode, inode->i_mode);
    		if (error)
    			return error;
    	}
    
    	return 0;
    
    out_cancel:
    	xfs_trans_cancel(tp);
    	xfs_iunlock(ip, XFS_ILOCK_EXCL);
    out_dqrele:
    	xfs_qm_dqrele(udqp);
    	xfs_qm_dqrele(gdqp);
    	return error;
    }
    
    int
    xfs_vn_setattr_nonsize(
    	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(dentry, iattr);
    	if (error)
    		return error;
    	return xfs_setattr_nonsize(ip, iattr, 0);
    }
    
    /*
     * 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 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_KILL_PRIV|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_d.di_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(ip, iattr, 0);
    	}
    
    	/*
    	 * 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 = iomap_zero_range(inode, oldsize, newsize - oldsize,
    				&did_zeroing, &xfs_iomap_ops);
    	} else {
    		error = iomap_truncate_page(inode, newsize, &did_zeroing,
    				&xfs_iomap_ops);
    	}
    
    	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 [di_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_d.di_size && oldsize != ip->i_d.di_size)) {
    		error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
    						ip->i_d.di_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_d.di_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);
    	}
    
    	if (iattr->ia_valid & ATTR_MODE)
    		xfs_setattr_mode(ip, iattr);
    	if (iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
    		xfs_setattr_time(ip, iattr);
    
    	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
    
    	XFS_STATS_INC(mp, xs_ig_attrchg);
    
    	if (mp->m_flags & XFS_MOUNT_WSYNC)
    		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 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(dentry, iattr);
    	if (error)
    		return error;
    	return xfs_setattr_size(ip, iattr);
    }
    
    STATIC int
    xfs_vn_setattr(
    	struct dentry		*dentry,
    	struct iattr		*iattr)
    {
    	int			error;
    
    	if (iattr->ia_valid & ATTR_SIZE) {
    		struct inode		*inode = d_inode(dentry);
    		struct xfs_inode	*ip = XFS_I(inode);
    		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(dentry, iattr);
    		xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
    	} else {
    		error = xfs_vn_setattr_nonsize(dentry, 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_iomap_ops);
    	}
    	xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED);
    
    	return error;
    }
    
    STATIC int
    xfs_vn_tmpfile(
    	struct inode	*dir,
    	struct dentry	*dentry,
    	umode_t		mode)
    {
    	return xfs_generic_create(dir, dentry, mode, 0, true);
    }
    
    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,
    };
    
    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,
    };
    
    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,
    };
    
    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,
    };
    
    static const struct inode_operations xfs_inline_symlink_inode_operations = {
    	.get_link		= xfs_vn_get_link_inline,
    	.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 non-reflinked files. */
    	if (!S_ISREG(VFS_I(ip)->i_mode) || xfs_is_reflink_inode(ip))
    		return false;
    
    	/* DAX mount option or DAX iflag must be set. */
    	if (!(mp->m_flags & XFS_MOUNT_DAX) &&
    	    !(ip->i_d.di_flags2 & XFS_DIFLAG2_DAX))
    		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_find_daxdev_for_inode(VFS_I(ip)) != NULL;
    }
    
    STATIC void
    xfs_diflags_to_iflags(
    	struct inode		*inode,
    	struct xfs_inode	*ip)
    {
    	uint16_t		flags = ip->i_d.di_flags;
    
    	inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC |
    			    S_NOATIME | S_DAX);
    
    	if (flags & XFS_DIFLAG_IMMUTABLE)
    		inode->i_flags |= S_IMMUTABLE;
    	if (flags & XFS_DIFLAG_APPEND)
    		inode->i_flags |= S_APPEND;
    	if (flags & XFS_DIFLAG_SYNC)
    		inode->i_flags |= S_SYNC;
    	if (flags & XFS_DIFLAG_NOATIME)
    		inode->i_flags |= S_NOATIME;
    	if (xfs_inode_supports_dax(ip))
    		inode->i_flags |= S_DAX;
    }
    
    /*
     * 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_ialloc 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);
    
    	inode->i_uid    = xfs_uid_to_kuid(ip->i_d.di_uid);
    	inode->i_gid    = xfs_gid_to_kgid(ip->i_d.di_gid);
    
    	i_size_write(inode, ip->i_d.di_size);
    	xfs_diflags_to_iflags(inode, ip);
    
    	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);
    		ip->d_ops = ip->i_mount->m_dir_inode_ops;
    	} else {
    		ip->d_ops = ip->i_mount->m_nondir_inode_ops;
    		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_IFORK_Q(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_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_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:
    		if (ip->i_df.if_flags & XFS_IFINLINE)
    			inode->i_op = &xfs_inline_symlink_inode_operations;
    		else
    			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;
    	}
    }