[net-next-2.6.git] / fs / xfs / linux-2.6 / xfs_iops.c

/*
 * Copyright (c) 2000-2004 Silicon Graphics, Inc.  All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * Further, this software is distributed without any warranty that it is
 * free of the rightful claim of any third person regarding infringement
 * or the like.  Any license provided herein, whether implied or
 * otherwise, applies only to this software file.  Patent licenses, if
 * any, provided herein do not apply to combinations of this program with
 * other software, or any other product whatsoever.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write the Free Software Foundation, Inc., 59
 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 * Mountain View, CA  94043, or:
 *
 * http://www.sgi.com
 *
 * For further information regarding this notice, see:
 *
 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
 */

#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_inum.h"
#include "xfs_log.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir.h"
#include "xfs_dir2.h"
#include "xfs_alloc.h"
#include "xfs_dmapi.h"
#include "xfs_quota.h"
#include "xfs_mount.h"
#include "xfs_alloc_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_btree.h"
#include "xfs_ialloc.h"
#include "xfs_attr_sf.h"
#include "xfs_dir_sf.h"
#include "xfs_dir2_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_bmap.h"
#include "xfs_bit.h"
#include "xfs_rtalloc.h"
#include "xfs_error.h"
#include "xfs_itable.h"
#include "xfs_rw.h"
#include "xfs_acl.h"
#include "xfs_cap.h"
#include "xfs_mac.h"
#include "xfs_attr.h"
#include "xfs_buf_item.h"
#include "xfs_utils.h"

#include <linux/xattr.h>
#include <linux/namei.h>


/*
 * Pull the link count and size up from the xfs inode to the linux inode
 */
STATIC void
validate_fields(
	struct inode	*ip)
{
	vnode_t		*vp = LINVFS_GET_VP(ip);
	vattr_t		va;
	int		error;

	va.va_mask = XFS_AT_NLINK|XFS_AT_SIZE|XFS_AT_NBLOCKS;
	VOP_GETATTR(vp, &va, ATTR_LAZY, NULL, error);
	if (likely(!error)) {
		ip->i_nlink = va.va_nlink;
		ip->i_blocks = va.va_nblocks;

		/* we're under i_sem so i_size can't change under us */
		if (i_size_read(ip) != va.va_size)
			i_size_write(ip, va.va_size);
	}
}

/*
 * Determine whether a process has a valid fs_struct (kernel daemons
 * like knfsd don't have an fs_struct).
 *
 * XXX(hch):  nfsd is broken, better fix it instead.
 */
STATIC inline int
has_fs_struct(struct task_struct *task)
{
	return (task->fs != init_task.fs);
}

STATIC int
linvfs_mknod(
	struct inode	*dir,
	struct dentry	*dentry,
	int		mode,
	dev_t		rdev)
{
	struct inode	*ip;
	vattr_t		va;
	vnode_t		*vp = NULL, *dvp = LINVFS_GET_VP(dir);
	xfs_acl_t	*default_acl = NULL;
	attrexists_t	test_default_acl = _ACL_DEFAULT_EXISTS;
	int		error;

	/*
	 * Irix uses Missed'em'V split, but doesn't want to see
	 * the upper 5 bits of (14bit) major.
	 */
	if (!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff)
		return -EINVAL;

	if (test_default_acl && test_default_acl(dvp)) {
		if (!_ACL_ALLOC(default_acl))
			return -ENOMEM;
		if (!_ACL_GET_DEFAULT(dvp, default_acl)) {
			_ACL_FREE(default_acl);
			default_acl = NULL;
		}
	}

	if (IS_POSIXACL(dir) && !default_acl && has_fs_struct(current))
		mode &= ~current->fs->umask;

	memset(&va, 0, sizeof(va));
	va.va_mask = XFS_AT_TYPE|XFS_AT_MODE;
	va.va_type = IFTOVT(mode);
	va.va_mode = mode;

	switch (mode & S_IFMT) {
	case S_IFCHR: case S_IFBLK: case S_IFIFO: case S_IFSOCK:
		va.va_rdev = sysv_encode_dev(rdev);
		va.va_mask |= XFS_AT_RDEV;
		/*FALLTHROUGH*/
	case S_IFREG:
		VOP_CREATE(dvp, dentry, &va, &vp, NULL, error);
		break;
	case S_IFDIR:
		VOP_MKDIR(dvp, dentry, &va, &vp, NULL, error);
		break;
	default:
		error = EINVAL;
		break;
	}

	if (default_acl) {
		if (!error) {
			error = _ACL_INHERIT(vp, &va, default_acl);
			if (!error) {
				VMODIFY(vp);
			} else {
				struct dentry	teardown = {};
				int		err2;

				/* Oh, the horror.
				 * If we can't add the ACL we must back out.
				 * ENOSPC can hit here, among other things.
				 */
				teardown.d_inode = ip = LINVFS_GET_IP(vp);
				teardown.d_name = dentry->d_name;

				vn_mark_bad(vp);
				
				if (S_ISDIR(mode))
					VOP_RMDIR(dvp, &teardown, NULL, err2);
				else
					VOP_REMOVE(dvp, &teardown, NULL, err2);
				VN_RELE(vp);
			}
		}
		_ACL_FREE(default_acl);
	}

	if (!error) {
		ASSERT(vp);
		ip = LINVFS_GET_IP(vp);

		if (S_ISCHR(mode) || S_ISBLK(mode))
			ip->i_rdev = rdev;
		else if (S_ISDIR(mode))
			validate_fields(ip);
		d_instantiate(dentry, ip);
		validate_fields(dir);
	}
	return -error;
}

STATIC int
linvfs_create(
	struct inode	*dir,
	struct dentry	*dentry,
	int		mode,
	struct nameidata *nd)
{
	return linvfs_mknod(dir, dentry, mode, 0);
}

STATIC int
linvfs_mkdir(
	struct inode	*dir,
	struct dentry	*dentry,
	int		mode)
{
	return linvfs_mknod(dir, dentry, mode|S_IFDIR, 0);
}

STATIC struct dentry *
linvfs_lookup(
	struct inode	*dir,
	struct dentry	*dentry,
	struct nameidata *nd)
{
	struct vnode	*vp = LINVFS_GET_VP(dir), *cvp;
	int		error;

	if (dentry->d_name.len >= MAXNAMELEN)
		return ERR_PTR(-ENAMETOOLONG);

	VOP_LOOKUP(vp, dentry, &cvp, 0, NULL, NULL, error);
	if (error) {
		if (unlikely(error != ENOENT))
			return ERR_PTR(-error);
		d_add(dentry, NULL);
		return NULL;
	}

	return d_splice_alias(LINVFS_GET_IP(cvp), dentry);
}

STATIC int
linvfs_link(
	struct dentry	*old_dentry,
	struct inode	*dir,
	struct dentry	*dentry)
{
	struct inode	*ip;	/* inode of guy being linked to */
	vnode_t		*tdvp;	/* target directory for new name/link */
	vnode_t		*vp;	/* vp of name being linked */
	int		error;

	ip = old_dentry->d_inode;	/* inode being linked to */
	if (S_ISDIR(ip->i_mode))
		return -EPERM;

	tdvp = LINVFS_GET_VP(dir);
	vp = LINVFS_GET_VP(ip);

	VOP_LINK(tdvp, vp, dentry, NULL, error);
	if (!error) {
		VMODIFY(tdvp);
		VN_HOLD(vp);
		validate_fields(ip);
		d_instantiate(dentry, ip);
	}
	return -error;
}

STATIC int
linvfs_unlink(
	struct inode	*dir,
	struct dentry	*dentry)
{
	struct inode	*inode;
	vnode_t		*dvp;	/* directory containing name to remove */
	int		error;

	inode = dentry->d_inode;
	dvp = LINVFS_GET_VP(dir);

	VOP_REMOVE(dvp, dentry, NULL, error);
	if (!error) {
		validate_fields(dir);	/* For size only */
		validate_fields(inode);
	}

	return -error;
}

STATIC int
linvfs_symlink(
	struct inode	*dir,
	struct dentry	*dentry,
	const char	*symname)
{
	struct inode	*ip;
	vattr_t		va;
	vnode_t		*dvp;	/* directory containing name of symlink */
	vnode_t		*cvp;	/* used to lookup symlink to put in dentry */
	int		error;

	dvp = LINVFS_GET_VP(dir);
	cvp = NULL;

	memset(&va, 0, sizeof(va));
	va.va_type = VLNK;
	va.va_mode = irix_symlink_mode ? 0777 & ~current->fs->umask : S_IRWXUGO;
	va.va_mask = XFS_AT_TYPE|XFS_AT_MODE;

	error = 0;
	VOP_SYMLINK(dvp, dentry, &va, (char *)symname, &cvp, NULL, error);
	if (!error && cvp) {
		ASSERT(cvp->v_type == VLNK);
		ip = LINVFS_GET_IP(cvp);
		d_instantiate(dentry, ip);
		validate_fields(dir);
		validate_fields(ip); /* size needs update */
	}
	return -error;
}

STATIC int
linvfs_rmdir(
	struct inode	*dir,
	struct dentry	*dentry)
{
	struct inode	*inode = dentry->d_inode;
	vnode_t		*dvp = LINVFS_GET_VP(dir);
	int		error;

	VOP_RMDIR(dvp, dentry, NULL, error);
	if (!error) {
		validate_fields(inode);
		validate_fields(dir);
	}
	return -error;
}

STATIC int
linvfs_rename(
	struct inode	*odir,
	struct dentry	*odentry,
	struct inode	*ndir,
	struct dentry	*ndentry)
{
	struct inode	*new_inode = ndentry->d_inode;
	vnode_t		*fvp;	/* from directory */
	vnode_t		*tvp;	/* target directory */
	int		error;

	fvp = LINVFS_GET_VP(odir);
	tvp = LINVFS_GET_VP(ndir);

	VOP_RENAME(fvp, odentry, tvp, ndentry, NULL, error);
	if (error)
		return -error;

	if (new_inode)
		validate_fields(new_inode);

	validate_fields(odir);
	if (ndir != odir)
		validate_fields(ndir);
	return 0;
}

/*
 * 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 int
linvfs_follow_link(
	struct dentry		*dentry,
	struct nameidata	*nd)
{
	vnode_t			*vp;
	uio_t			*uio;
	iovec_t			iov;
	int			error;
	char			*link;

	ASSERT(dentry);
	ASSERT(nd);

	link = (char *)kmalloc(MAXNAMELEN+1, GFP_KERNEL);
	if (!link) {
		nd_set_link(nd, ERR_PTR(-ENOMEM));
		return 0;
	}

	uio = (uio_t *)kmalloc(sizeof(uio_t), GFP_KERNEL);
	if (!uio) {
		kfree(link);
		nd_set_link(nd, ERR_PTR(-ENOMEM));
		return 0;
	}

	vp = LINVFS_GET_VP(dentry->d_inode);

	iov.iov_base = link;
	iov.iov_len = MAXNAMELEN;

	uio->uio_iov = &iov;
	uio->uio_offset = 0;
	uio->uio_segflg = UIO_SYSSPACE;
	uio->uio_resid = MAXNAMELEN;
	uio->uio_iovcnt = 1;

	VOP_READLINK(vp, uio, 0, NULL, error);
	if (error) {
		kfree(link);
		link = ERR_PTR(-error);
	} else {
		link[MAXNAMELEN - uio->uio_resid] = '\0';
	}
	kfree(uio);

	nd_set_link(nd, link);
	return 0;
}

static void linvfs_put_link(struct dentry *dentry, struct nameidata *nd)
{
	char *s = nd_get_link(nd);
	if (!IS_ERR(s))
		kfree(s);
}

#ifdef CONFIG_XFS_POSIX_ACL
STATIC int
linvfs_permission(
	struct inode	*inode,
	int		mode,
	struct nameidata *nd)
{
	vnode_t		*vp = LINVFS_GET_VP(inode);
	int		error;

	mode <<= 6;		/* convert from linux to vnode access bits */
	VOP_ACCESS(vp, mode, NULL, error);
	return -error;
}
#else
#define linvfs_permission NULL
#endif

STATIC int
linvfs_getattr(
	struct vfsmount	*mnt,
	struct dentry	*dentry,
	struct kstat	*stat)
{
	struct inode	*inode = dentry->d_inode;
	vnode_t		*vp = LINVFS_GET_VP(inode);
	int		error = 0;

	if (unlikely(vp->v_flag & VMODIFIED))
		error = vn_revalidate(vp);
	if (!error)
		generic_fillattr(inode, stat);
	return 0;
}

STATIC int
linvfs_setattr(
	struct dentry	*dentry,
	struct iattr	*attr)
{
	struct inode	*inode = dentry->d_inode;
	unsigned int	ia_valid = attr->ia_valid;
	vnode_t		*vp = LINVFS_GET_VP(inode);
	vattr_t		vattr;
	int		flags = 0;
	int		error;

	memset(&vattr, 0, sizeof(vattr_t));
	if (ia_valid & ATTR_UID) {
		vattr.va_mask |= XFS_AT_UID;
		vattr.va_uid = attr->ia_uid;
	}
	if (ia_valid & ATTR_GID) {
		vattr.va_mask |= XFS_AT_GID;
		vattr.va_gid = attr->ia_gid;
	}
	if (ia_valid & ATTR_SIZE) {
		vattr.va_mask |= XFS_AT_SIZE;
		vattr.va_size = attr->ia_size;
	}
	if (ia_valid & ATTR_ATIME) {
		vattr.va_mask |= XFS_AT_ATIME;
		vattr.va_atime = attr->ia_atime;
	}
	if (ia_valid & ATTR_MTIME) {
		vattr.va_mask |= XFS_AT_MTIME;
		vattr.va_mtime = attr->ia_mtime;
	}
	if (ia_valid & ATTR_CTIME) {
		vattr.va_mask |= XFS_AT_CTIME;
		vattr.va_ctime = attr->ia_ctime;
	}
	if (ia_valid & ATTR_MODE) {
		vattr.va_mask |= XFS_AT_MODE;
		vattr.va_mode = attr->ia_mode;
		if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
			inode->i_mode &= ~S_ISGID;
	}

	if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET))
		flags |= ATTR_UTIME;
#ifdef ATTR_NO_BLOCK
	if ((ia_valid & ATTR_NO_BLOCK))
		flags |= ATTR_NONBLOCK;
#endif

	VOP_SETATTR(vp, &vattr, flags, NULL, error);
	if (error)
		return -error;
	vn_revalidate(vp);
	return error;
}

STATIC void
linvfs_truncate(
	struct inode	*inode)
{
	block_truncate_page(inode->i_mapping, inode->i_size, linvfs_get_block);
}

STATIC int
linvfs_setxattr(
	struct dentry	*dentry,
	const char	*name,
	const void	*data,
	size_t		size,
	int		flags)
{
	vnode_t		*vp = LINVFS_GET_VP(dentry->d_inode);
	char		*attr = (char *)name;
	attrnames_t	*namesp;
	int		xflags = 0;
	int		error;

	namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
	if (!namesp)
		return -EOPNOTSUPP;
	attr += namesp->attr_namelen;
	error = namesp->attr_capable(vp, NULL);
	if (error)
		return error;

	/* Convert Linux syscall to XFS internal ATTR flags */
	if (flags & XATTR_CREATE)
		xflags |= ATTR_CREATE;
	if (flags & XATTR_REPLACE)
		xflags |= ATTR_REPLACE;
	xflags |= namesp->attr_flag;
	return namesp->attr_set(vp, attr, (void *)data, size, xflags);
}

STATIC ssize_t
linvfs_getxattr(
	struct dentry	*dentry,
	const char	*name,
	void		*data,
	size_t		size)
{
	vnode_t		*vp = LINVFS_GET_VP(dentry->d_inode);
	char		*attr = (char *)name;
	attrnames_t	*namesp;
	int		xflags = 0;
	ssize_t		error;

	namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
	if (!namesp)
		return -EOPNOTSUPP;
	attr += namesp->attr_namelen;
	error = namesp->attr_capable(vp, NULL);
	if (error)
		return error;

	/* Convert Linux syscall to XFS internal ATTR flags */
	if (!size) {
		xflags |= ATTR_KERNOVAL;
		data = NULL;
	}
	xflags |= namesp->attr_flag;
	return namesp->attr_get(vp, attr, (void *)data, size, xflags);
}

STATIC ssize_t
linvfs_listxattr(
	struct dentry		*dentry,
	char			*data,
	size_t			size)
{
	vnode_t			*vp = LINVFS_GET_VP(dentry->d_inode);
	int			error, xflags = ATTR_KERNAMELS;
	ssize_t			result;

	if (!size)
		xflags |= ATTR_KERNOVAL;
	xflags |= capable(CAP_SYS_ADMIN) ? ATTR_KERNFULLS : ATTR_KERNORMALS;

	error = attr_generic_list(vp, data, size, xflags, &result);
	if (error < 0)
		return error;
	return result;
}

STATIC int
linvfs_removexattr(
	struct dentry	*dentry,
	const char	*name)
{
	vnode_t		*vp = LINVFS_GET_VP(dentry->d_inode);
	char		*attr = (char *)name;
	attrnames_t	*namesp;
	int		xflags = 0;
	int		error;

	namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
	if (!namesp)
		return -EOPNOTSUPP;
	attr += namesp->attr_namelen;
	error = namesp->attr_capable(vp, NULL);
	if (error)
		return error;
	xflags |= namesp->attr_flag;
	return namesp->attr_remove(vp, attr, xflags);
}


struct inode_operations linvfs_file_inode_operations = {
	.permission		= linvfs_permission,
	.truncate		= linvfs_truncate,
	.getattr		= linvfs_getattr,
	.setattr		= linvfs_setattr,
	.setxattr		= linvfs_setxattr,
	.getxattr		= linvfs_getxattr,
	.listxattr		= linvfs_listxattr,
	.removexattr		= linvfs_removexattr,
};

struct inode_operations linvfs_dir_inode_operations = {
	.create			= linvfs_create,
	.lookup			= linvfs_lookup,
	.link			= linvfs_link,
	.unlink			= linvfs_unlink,
	.symlink		= linvfs_symlink,
	.mkdir			= linvfs_mkdir,
	.rmdir			= linvfs_rmdir,
	.mknod			= linvfs_mknod,
	.rename			= linvfs_rename,
	.permission		= linvfs_permission,
	.getattr		= linvfs_getattr,
	.setattr		= linvfs_setattr,
	.setxattr		= linvfs_setxattr,
	.getxattr		= linvfs_getxattr,
	.listxattr		= linvfs_listxattr,
	.removexattr		= linvfs_removexattr,
};

struct inode_operations linvfs_symlink_inode_operations = {
	.readlink		= generic_readlink,
	.follow_link		= linvfs_follow_link,
	.put_link		= linvfs_put_link,
	.permission		= linvfs_permission,
	.getattr		= linvfs_getattr,
	.setattr		= linvfs_setattr,
	.setxattr		= linvfs_setxattr,
	.getxattr		= linvfs_getxattr,
	.listxattr		= linvfs_listxattr,
	.removexattr		= linvfs_removexattr,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved.
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms of version 2 of the GNU General Public License as
	6	* published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it would be useful, but
	9	* WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
	11	*
	12	* Further, this software is distributed without any warranty that it is
	13	* free of the rightful claim of any third person regarding infringement
	14	* or the like. Any license provided herein, whether implied or
	15	* otherwise, applies only to this software file. Patent licenses, if
	16	* any, provided herein do not apply to combinations of this program with
	17	* other software, or any other product whatsoever.
	18	*
	19	* You should have received a copy of the GNU General Public License along
	20	* with this program; if not, write the Free Software Foundation, Inc., 59
	21	* Temple Place - Suite 330, Boston MA 02111-1307, USA.
	22	*
	23	* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
	24	* Mountain View, CA 94043, or:
	25	*
	26	* http://www.sgi.com
	27	*
	28	* For further information regarding this notice, see:
	29	*
	30	* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
	31	*/
	32
	33	#include "xfs.h"
	34	#include "xfs_fs.h"
	35	#include "xfs_inum.h"
	36	#include "xfs_log.h"
	37	#include "xfs_trans.h"
	38	#include "xfs_sb.h"
	39	#include "xfs_ag.h"
	40	#include "xfs_dir.h"
	41	#include "xfs_dir2.h"
	42	#include "xfs_alloc.h"
	43	#include "xfs_dmapi.h"
	44	#include "xfs_quota.h"
	45	#include "xfs_mount.h"
	46	#include "xfs_alloc_btree.h"
	47	#include "xfs_bmap_btree.h"
	48	#include "xfs_ialloc_btree.h"
	49	#include "xfs_btree.h"
	50	#include "xfs_ialloc.h"
	51	#include "xfs_attr_sf.h"
	52	#include "xfs_dir_sf.h"
	53	#include "xfs_dir2_sf.h"
	54	#include "xfs_dinode.h"
	55	#include "xfs_inode.h"
	56	#include "xfs_bmap.h"
	57	#include "xfs_bit.h"
	58	#include "xfs_rtalloc.h"
	59	#include "xfs_error.h"
	60	#include "xfs_itable.h"
	61	#include "xfs_rw.h"
	62	#include "xfs_acl.h"
	63	#include "xfs_cap.h"
	64	#include "xfs_mac.h"
65	#include "xfs_attr.h"
66	#include "xfs_buf_item.h"
67	#include "xfs_utils.h"
68
69	#include <linux/xattr.h>
70	#include <linux/namei.h>
71
72
73	/*
74	* Pull the link count and size up from the xfs inode to the linux inode
75	*/
76	STATIC void
77	validate_fields(
78	struct inode *ip)
79	{
80	vnode_t *vp = LINVFS_GET_VP(ip);
81	vattr_t va;
82	int error;
83
84	va.va_mask = XFS_AT_NLINK\|XFS_AT_SIZE\|XFS_AT_NBLOCKS;
85	VOP_GETATTR(vp, &va, ATTR_LAZY, NULL, error);
86	if (likely(!error)) {
87	ip->i_nlink = va.va_nlink;
88	ip->i_blocks = va.va_nblocks;
89
90	/* we're under i_sem so i_size can't change under us */
91	if (i_size_read(ip) != va.va_size)
92	i_size_write(ip, va.va_size);
93	}
94	}
95
96	/*
97	* Determine whether a process has a valid fs_struct (kernel daemons
98	* like knfsd don't have an fs_struct).
99	*
100	* XXX(hch): nfsd is broken, better fix it instead.
101	*/
102	STATIC inline int
103	has_fs_struct(struct task_struct *task)
104	{
105	return (task->fs != init_task.fs);
106	}
107
108	STATIC int
109	linvfs_mknod(
110	struct inode *dir,
111	struct dentry *dentry,
112	int mode,
113	dev_t rdev)
114	{
115	struct inode *ip;
116	vattr_t va;
117	vnode_t vp = NULL, dvp = LINVFS_GET_VP(dir);
118	xfs_acl_t *default_acl = NULL;
119	attrexists_t test_default_acl = _ACL_DEFAULT_EXISTS;
120	int error;
121
122	/*
123	* Irix uses Missed'em'V split, but doesn't want to see
124	* the upper 5 bits of (14bit) major.
125	*/
126	if (!sysv_valid_dev(rdev) \|\| MAJOR(rdev) & ~0x1ff)
127	return -EINVAL;
128
129	if (test_default_acl && test_default_acl(dvp)) {
130	if (!_ACL_ALLOC(default_acl))
131	return -ENOMEM;
132	if (!_ACL_GET_DEFAULT(dvp, default_acl)) {
133	_ACL_FREE(default_acl);
134	default_acl = NULL;
135	}
136	}
137
138	if (IS_POSIXACL(dir) && !default_acl && has_fs_struct(current))
139	mode &= ~current->fs->umask;
140
141	memset(&va, 0, sizeof(va));
142	va.va_mask = XFS_AT_TYPE\|XFS_AT_MODE;
143	va.va_type = IFTOVT(mode);
144	va.va_mode = mode;
145
146	switch (mode & S_IFMT) {
147	case S_IFCHR: case S_IFBLK: case S_IFIFO: case S_IFSOCK:
148	va.va_rdev = sysv_encode_dev(rdev);
149	va.va_mask \|= XFS_AT_RDEV;
150	/FALLTHROUGH/
151	case S_IFREG:
152	VOP_CREATE(dvp, dentry, &va, &vp, NULL, error);
153	break;
154	case S_IFDIR:
155	VOP_MKDIR(dvp, dentry, &va, &vp, NULL, error);
156	break;
157	default:
158	error = EINVAL;
159	break;
160	}
161
162	if (default_acl) {
163	if (!error) {
164	error = _ACL_INHERIT(vp, &va, default_acl);
165	if (!error) {
166	VMODIFY(vp);
167	} else {
168	struct dentry teardown = {};
169	int err2;
170
171	/* Oh, the horror.
172	* If we can't add the ACL we must back out.
173	* ENOSPC can hit here, among other things.
174	*/
175	teardown.d_inode = ip = LINVFS_GET_IP(vp);
176	teardown.d_name = dentry->d_name;
177
178	vn_mark_bad(vp);
179
180	if (S_ISDIR(mode))
181	VOP_RMDIR(dvp, &teardown, NULL, err2);
182	else
183	VOP_REMOVE(dvp, &teardown, NULL, err2);
184	VN_RELE(vp);
185	}
186	}
187	_ACL_FREE(default_acl);
188	}
189
190	if (!error) {
191	ASSERT(vp);
192	ip = LINVFS_GET_IP(vp);
193
194	if (S_ISCHR(mode) \|\| S_ISBLK(mode))
195	ip->i_rdev = rdev;
196	else if (S_ISDIR(mode))
197	validate_fields(ip);
198	d_instantiate(dentry, ip);
199	validate_fields(dir);
200	}
201	return -error;
202	}
203
204	STATIC int
205	linvfs_create(
206	struct inode *dir,
207	struct dentry *dentry,
208	int mode,
209	struct nameidata *nd)
210	{
211	return linvfs_mknod(dir, dentry, mode, 0);
212	}
213
214	STATIC int
215	linvfs_mkdir(
216	struct inode *dir,
217	struct dentry *dentry,
218	int mode)
219	{
220	return linvfs_mknod(dir, dentry, mode\|S_IFDIR, 0);
221	}
222
223	STATIC struct dentry *
224	linvfs_lookup(
225	struct inode *dir,
226	struct dentry *dentry,
227	struct nameidata *nd)
228	{
229	struct vnode vp = LINVFS_GET_VP(dir), cvp;
230	int error;
231
232	if (dentry->d_name.len >= MAXNAMELEN)
233	return ERR_PTR(-ENAMETOOLONG);
234
235	VOP_LOOKUP(vp, dentry, &cvp, 0, NULL, NULL, error);
236	if (error) {
237	if (unlikely(error != ENOENT))
238	return ERR_PTR(-error);
239	d_add(dentry, NULL);
240	return NULL;
241	}
242
243	return d_splice_alias(LINVFS_GET_IP(cvp), dentry);
244	}
245
246	STATIC int
247	linvfs_link(
248	struct dentry *old_dentry,
249	struct inode *dir,
250	struct dentry *dentry)
251	{
252	struct inode ip; / inode of guy being linked to */
253	vnode_t tdvp; / target directory for new name/link */
254	vnode_t vp; / vp of name being linked */
255	int error;
256
257	ip = old_dentry->d_inode; /* inode being linked to */
258	if (S_ISDIR(ip->i_mode))
259	return -EPERM;
260
261	tdvp = LINVFS_GET_VP(dir);
262	vp = LINVFS_GET_VP(ip);
263
264	VOP_LINK(tdvp, vp, dentry, NULL, error);
265	if (!error) {
266	VMODIFY(tdvp);
267	VN_HOLD(vp);
268	validate_fields(ip);
269	d_instantiate(dentry, ip);
270	}
271	return -error;
272	}
273
274	STATIC int
275	linvfs_unlink(
276	struct inode *dir,
277	struct dentry *dentry)
278	{
279	struct inode *inode;
280	vnode_t dvp; / directory containing name to remove */
281	int error;
282
283	inode = dentry->d_inode;
284	dvp = LINVFS_GET_VP(dir);
285
286	VOP_REMOVE(dvp, dentry, NULL, error);
287	if (!error) {
288	validate_fields(dir); /* For size only */
289	validate_fields(inode);
290	}
291
292	return -error;
293	}
294
295	STATIC int
296	linvfs_symlink(
297	struct inode *dir,
298	struct dentry *dentry,
299	const char *symname)
300	{
301	struct inode *ip;
302	vattr_t va;
303	vnode_t dvp; / directory containing name of symlink */
304	vnode_t cvp; / used to lookup symlink to put in dentry */
305	int error;
306
307	dvp = LINVFS_GET_VP(dir);
308	cvp = NULL;
309
310	memset(&va, 0, sizeof(va));
311	va.va_type = VLNK;
312	va.va_mode = irix_symlink_mode ? 0777 & ~current->fs->umask : S_IRWXUGO;
313	va.va_mask = XFS_AT_TYPE\|XFS_AT_MODE;
314
315	error = 0;
316	VOP_SYMLINK(dvp, dentry, &va, (char *)symname, &cvp, NULL, error);
317	if (!error && cvp) {
318	ASSERT(cvp->v_type == VLNK);
319	ip = LINVFS_GET_IP(cvp);
320	d_instantiate(dentry, ip);
321	validate_fields(dir);
322	validate_fields(ip); /* size needs update */
323	}
324	return -error;
325	}
326
327	STATIC int
328	linvfs_rmdir(
329	struct inode *dir,
330	struct dentry *dentry)
331	{
332	struct inode *inode = dentry->d_inode;
333	vnode_t *dvp = LINVFS_GET_VP(dir);
334	int error;
335
336	VOP_RMDIR(dvp, dentry, NULL, error);
337	if (!error) {
338	validate_fields(inode);
339	validate_fields(dir);
340	}
341	return -error;
342	}
343
344	STATIC int
345	linvfs_rename(
346	struct inode *odir,
347	struct dentry *odentry,
348	struct inode *ndir,
349	struct dentry *ndentry)
350	{
351	struct inode *new_inode = ndentry->d_inode;
352	vnode_t fvp; / from directory */
353	vnode_t tvp; / target directory */
354	int error;
355
356	fvp = LINVFS_GET_VP(odir);
357	tvp = LINVFS_GET_VP(ndir);
358
359	VOP_RENAME(fvp, odentry, tvp, ndentry, NULL, error);
360	if (error)
361	return -error;
362
363	if (new_inode)
364	validate_fields(new_inode);
365
366	validate_fields(odir);
367	if (ndir != odir)
368	validate_fields(ndir);
369	return 0;
370	}
371
372	/*
373	* careful here - this function can get called recursively, so
374	* we need to be very careful about how much stack we use.
375	* uio is kmalloced for this reason...
376	*/
377	STATIC int
378	linvfs_follow_link(
379	struct dentry *dentry,
380	struct nameidata *nd)
381	{
382	vnode_t *vp;
383	uio_t *uio;
384	iovec_t iov;
385	int error;
386	char *link;
387
388	ASSERT(dentry);
389	ASSERT(nd);
390
391	link = (char *)kmalloc(MAXNAMELEN+1, GFP_KERNEL);
392	if (!link) {
393	nd_set_link(nd, ERR_PTR(-ENOMEM));
394	return 0;
395	}
396
397	uio = (uio_t *)kmalloc(sizeof(uio_t), GFP_KERNEL);
398	if (!uio) {
399	kfree(link);
400	nd_set_link(nd, ERR_PTR(-ENOMEM));
401	return 0;
402	}
403
404	vp = LINVFS_GET_VP(dentry->d_inode);
405
406	iov.iov_base = link;
407	iov.iov_len = MAXNAMELEN;
408
409	uio->uio_iov = &iov;
410	uio->uio_offset = 0;
411	uio->uio_segflg = UIO_SYSSPACE;
412	uio->uio_resid = MAXNAMELEN;
413	uio->uio_iovcnt = 1;
414
415	VOP_READLINK(vp, uio, 0, NULL, error);
416	if (error) {
417	kfree(link);
418	link = ERR_PTR(-error);
419	} else {
420	link[MAXNAMELEN - uio->uio_resid] = '\0';
421	}
422	kfree(uio);
423
424	nd_set_link(nd, link);
425	return 0;
426	}
427
428	static void linvfs_put_link(struct dentry dentry, struct nameidata nd)
429	{
430	char *s = nd_get_link(nd);
431	if (!IS_ERR(s))
432	kfree(s);
433	}
434
435	#ifdef CONFIG_XFS_POSIX_ACL
436	STATIC int
437	linvfs_permission(
438	struct inode *inode,
439	int mode,
440	struct nameidata *nd)
441	{
442	vnode_t *vp = LINVFS_GET_VP(inode);
443	int error;
444
445	mode <<= 6; /* convert from linux to vnode access bits */
446	VOP_ACCESS(vp, mode, NULL, error);
447	return -error;
448	}
449	#else
450	#define linvfs_permission NULL
451	#endif
452
453	STATIC int
454	linvfs_getattr(
455	struct vfsmount *mnt,
456	struct dentry *dentry,
457	struct kstat *stat)
458	{
459	struct inode *inode = dentry->d_inode;
460	vnode_t *vp = LINVFS_GET_VP(inode);
461	int error = 0;
462
463	if (unlikely(vp->v_flag & VMODIFIED))
464	error = vn_revalidate(vp);
465	if (!error)
466	generic_fillattr(inode, stat);
467	return 0;
468	}
469
470	STATIC int
471	linvfs_setattr(
472	struct dentry *dentry,
473	struct iattr *attr)
474	{
475	struct inode *inode = dentry->d_inode;
476	unsigned int ia_valid = attr->ia_valid;
477	vnode_t *vp = LINVFS_GET_VP(inode);
478	vattr_t vattr;
479	int flags = 0;
480	int error;
481
482	memset(&vattr, 0, sizeof(vattr_t));
483	if (ia_valid & ATTR_UID) {
484	vattr.va_mask \|= XFS_AT_UID;
485	vattr.va_uid = attr->ia_uid;
486	}
487	if (ia_valid & ATTR_GID) {
488	vattr.va_mask \|= XFS_AT_GID;
489	vattr.va_gid = attr->ia_gid;
490	}
491	if (ia_valid & ATTR_SIZE) {
492	vattr.va_mask \|= XFS_AT_SIZE;
493	vattr.va_size = attr->ia_size;
494	}
495	if (ia_valid & ATTR_ATIME) {
496	vattr.va_mask \|= XFS_AT_ATIME;
497	vattr.va_atime = attr->ia_atime;
498	}
499	if (ia_valid & ATTR_MTIME) {
500	vattr.va_mask \|= XFS_AT_MTIME;
501	vattr.va_mtime = attr->ia_mtime;
502	}
503	if (ia_valid & ATTR_CTIME) {
504	vattr.va_mask \|= XFS_AT_CTIME;
505	vattr.va_ctime = attr->ia_ctime;
506	}
507	if (ia_valid & ATTR_MODE) {
508	vattr.va_mask \|= XFS_AT_MODE;
509	vattr.va_mode = attr->ia_mode;
510	if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
511	inode->i_mode &= ~S_ISGID;
512	}
513
514	if (ia_valid & (ATTR_MTIME_SET \| ATTR_ATIME_SET))
515	flags \|= ATTR_UTIME;
516	#ifdef ATTR_NO_BLOCK
517	if ((ia_valid & ATTR_NO_BLOCK))
518	flags \|= ATTR_NONBLOCK;
519	#endif
520
521	VOP_SETATTR(vp, &vattr, flags, NULL, error);
522	if (error)
523	return -error;
524	vn_revalidate(vp);
525	return error;
526	}
527
528	STATIC void
529	linvfs_truncate(
530	struct inode *inode)
531	{
532	block_truncate_page(inode->i_mapping, inode->i_size, linvfs_get_block);
533	}
534
535	STATIC int
536	linvfs_setxattr(
537	struct dentry *dentry,
538	const char *name,
539	const void *data,
540	size_t size,
541	int flags)
542	{
543	vnode_t *vp = LINVFS_GET_VP(dentry->d_inode);
544	char attr = (char )name;
545	attrnames_t *namesp;
546	int xflags = 0;
547	int error;
548
549	namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
550	if (!namesp)
551	return -EOPNOTSUPP;
552	attr += namesp->attr_namelen;
553	error = namesp->attr_capable(vp, NULL);
554	if (error)
555	return error;
556
557	/* Convert Linux syscall to XFS internal ATTR flags */
558	if (flags & XATTR_CREATE)
559	xflags \|= ATTR_CREATE;
560	if (flags & XATTR_REPLACE)
561	xflags \|= ATTR_REPLACE;
562	xflags \|= namesp->attr_flag;
563	return namesp->attr_set(vp, attr, (void *)data, size, xflags);
564	}
565
566	STATIC ssize_t
567	linvfs_getxattr(
568	struct dentry *dentry,
569	const char *name,
570	void *data,
571	size_t size)
572	{
573	vnode_t *vp = LINVFS_GET_VP(dentry->d_inode);
574	char attr = (char )name;
575	attrnames_t *namesp;
576	int xflags = 0;
577	ssize_t error;
578
579	namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
580	if (!namesp)
581	return -EOPNOTSUPP;
582	attr += namesp->attr_namelen;
583	error = namesp->attr_capable(vp, NULL);
584	if (error)
585	return error;
586
587	/* Convert Linux syscall to XFS internal ATTR flags */
588	if (!size) {
589	xflags \|= ATTR_KERNOVAL;
590	data = NULL;
591	}
592	xflags \|= namesp->attr_flag;
593	return namesp->attr_get(vp, attr, (void *)data, size, xflags);
594	}
595
596	STATIC ssize_t
597	linvfs_listxattr(
598	struct dentry *dentry,
599	char *data,
600	size_t size)
601	{
602	vnode_t *vp = LINVFS_GET_VP(dentry->d_inode);
603	int error, xflags = ATTR_KERNAMELS;
604	ssize_t result;
605
606	if (!size)
607	xflags \|= ATTR_KERNOVAL;
608	xflags \|= capable(CAP_SYS_ADMIN) ? ATTR_KERNFULLS : ATTR_KERNORMALS;
609
610	error = attr_generic_list(vp, data, size, xflags, &result);
611	if (error < 0)
612	return error;
613	return result;
614	}
615
616	STATIC int
617	linvfs_removexattr(
618	struct dentry *dentry,
619	const char *name)
620	{
621	vnode_t *vp = LINVFS_GET_VP(dentry->d_inode);
622	char attr = (char )name;
623	attrnames_t *namesp;
624	int xflags = 0;
625	int error;
626
627	namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
628	if (!namesp)
629	return -EOPNOTSUPP;
630	attr += namesp->attr_namelen;
631	error = namesp->attr_capable(vp, NULL);
632	if (error)
633	return error;
634	xflags \|= namesp->attr_flag;
635	return namesp->attr_remove(vp, attr, xflags);
636	}
637
638
639	struct inode_operations linvfs_file_inode_operations = {
640	.permission = linvfs_permission,
641	.truncate = linvfs_truncate,
642	.getattr = linvfs_getattr,
643	.setattr = linvfs_setattr,
644	.setxattr = linvfs_setxattr,
645	.getxattr = linvfs_getxattr,
646	.listxattr = linvfs_listxattr,
647	.removexattr = linvfs_removexattr,
648	};
649
650	struct inode_operations linvfs_dir_inode_operations = {
651	.create = linvfs_create,
652	.lookup = linvfs_lookup,
653	.link = linvfs_link,
654	.unlink = linvfs_unlink,
655	.symlink = linvfs_symlink,
656	.mkdir = linvfs_mkdir,
657	.rmdir = linvfs_rmdir,
658	.mknod = linvfs_mknod,
659	.rename = linvfs_rename,
660	.permission = linvfs_permission,
661	.getattr = linvfs_getattr,
662	.setattr = linvfs_setattr,
663	.setxattr = linvfs_setxattr,
664	.getxattr = linvfs_getxattr,
665	.listxattr = linvfs_listxattr,
666	.removexattr = linvfs_removexattr,
667	};
668
669	struct inode_operations linvfs_symlink_inode_operations = {
670	.readlink = generic_readlink,
671	.follow_link = linvfs_follow_link,
672	.put_link = linvfs_put_link,
673	.permission = linvfs_permission,
674	.getattr = linvfs_getattr,
675	.setattr = linvfs_setattr,
676	.setxattr = linvfs_setxattr,
677	.getxattr = linvfs_getxattr,
678	.listxattr = linvfs_listxattr,
679	.removexattr = linvfs_removexattr,
680	};