[deliverable/linux.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_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_mode = S_IFLNK |
		(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) {
		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 void *
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 NULL;
	}

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

	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 NULL;
}

static void linvfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
{
	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;
1da177e4 LT	143	va.va_mode = mode;
	144
	145	switch (mode & S_IFMT) {
	146	case S_IFCHR: case S_IFBLK: case S_IFIFO: case S_IFSOCK:
	147	va.va_rdev = sysv_encode_dev(rdev);
	148	va.va_mask \|= XFS_AT_RDEV;
	149	/FALLTHROUGH/
	150	case S_IFREG:
	151	VOP_CREATE(dvp, dentry, &va, &vp, NULL, error);
	152	break;
	153	case S_IFDIR:
	154	VOP_MKDIR(dvp, dentry, &va, &vp, NULL, error);
	155	break;
	156	default:
	157	error = EINVAL;
	158	break;
	159	}
	160
	161	if (default_acl) {
	162	if (!error) {
	163	error = _ACL_INHERIT(vp, &va, default_acl);
	164	if (!error) {
	165	VMODIFY(vp);
	166	} else {
	167	struct dentry teardown = {};
	168	int err2;
	169
	170	/* Oh, the horror.
	171	* If we can't add the ACL we must back out.
	172	* ENOSPC can hit here, among other things.
	173	*/
	174	teardown.d_inode = ip = LINVFS_GET_IP(vp);
	175	teardown.d_name = dentry->d_name;
	176
	177	vn_mark_bad(vp);
	178
	179	if (S_ISDIR(mode))
	180	VOP_RMDIR(dvp, &teardown, NULL, err2);
	181	else
	182	VOP_REMOVE(dvp, &teardown, NULL, err2);
	183	VN_RELE(vp);
	184	}
	185	}
	186	_ACL_FREE(default_acl);
	187	}
	188
	189	if (!error) {
	190	ASSERT(vp);
	191	ip = LINVFS_GET_IP(vp);
	192
	193	if (S_ISCHR(mode) \|\| S_ISBLK(mode))
	194	ip->i_rdev = rdev;
	195	else if (S_ISDIR(mode))
	196	validate_fields(ip);
	197	d_instantiate(dentry, ip);
	198	validate_fields(dir);
	199	}
	200	return -error;
	201	}
	202
	203	STATIC int
	204	linvfs_create(
	205	struct inode *dir,
	206	struct dentry *dentry,
207	int mode,
208	struct nameidata *nd)
209	{
210	return linvfs_mknod(dir, dentry, mode, 0);
211	}
212
213	STATIC int
214	linvfs_mkdir(
215	struct inode *dir,
216	struct dentry *dentry,
217	int mode)
218	{
219	return linvfs_mknod(dir, dentry, mode\|S_IFDIR, 0);
220	}
221
222	STATIC struct dentry *
223	linvfs_lookup(
224	struct inode *dir,
225	struct dentry *dentry,
226	struct nameidata *nd)
227	{
228	struct vnode vp = LINVFS_GET_VP(dir), cvp;
229	int error;
230
231	if (dentry->d_name.len >= MAXNAMELEN)
232	return ERR_PTR(-ENAMETOOLONG);
233
234	VOP_LOOKUP(vp, dentry, &cvp, 0, NULL, NULL, error);
235	if (error) {
236	if (unlikely(error != ENOENT))
237	return ERR_PTR(-error);
238	d_add(dentry, NULL);
239	return NULL;
240	}
241
242	return d_splice_alias(LINVFS_GET_IP(cvp), dentry);
243	}
244
245	STATIC int
246	linvfs_link(
247	struct dentry *old_dentry,
248	struct inode *dir,
249	struct dentry *dentry)
250	{
251	struct inode ip; / inode of guy being linked to */
252	vnode_t tdvp; / target directory for new name/link */
253	vnode_t vp; / vp of name being linked */
254	int error;
255
256	ip = old_dentry->d_inode; /* inode being linked to */
257	if (S_ISDIR(ip->i_mode))
258	return -EPERM;
259
260	tdvp = LINVFS_GET_VP(dir);
261	vp = LINVFS_GET_VP(ip);
262
263	VOP_LINK(tdvp, vp, dentry, NULL, error);
264	if (!error) {
265	VMODIFY(tdvp);
266	VN_HOLD(vp);
267	validate_fields(ip);
268	d_instantiate(dentry, ip);
269	}
270	return -error;
271	}
272
273	STATIC int
274	linvfs_unlink(
275	struct inode *dir,
276	struct dentry *dentry)
277	{
278	struct inode *inode;
279	vnode_t dvp; / directory containing name to remove */
280	int error;
281
282	inode = dentry->d_inode;
283	dvp = LINVFS_GET_VP(dir);
284
285	VOP_REMOVE(dvp, dentry, NULL, error);
286	if (!error) {
287	validate_fields(dir); /* For size only */
288	validate_fields(inode);
289	}
290
291	return -error;
292	}
293
294	STATIC int
295	linvfs_symlink(
296	struct inode *dir,
297	struct dentry *dentry,
298	const char *symname)
299	{
300	struct inode *ip;
301	vattr_t va;
302	vnode_t dvp; / directory containing name of symlink */
303	vnode_t cvp; / used to lookup symlink to put in dentry */
304	int error;
305
306	dvp = LINVFS_GET_VP(dir);
307	cvp = NULL;
308
309	memset(&va, 0, sizeof(va));
0432dab2 CH	310	va.va_mode = S_IFLNK \|
0432dab2 CH	311	(irix_symlink_mode ? 0777 & ~current->fs->umask : S_IRWXUGO);
1da177e4 LT	312	va.va_mask = XFS_AT_TYPE\|XFS_AT_MODE;
	313
	314	error = 0;
	315	VOP_SYMLINK(dvp, dentry, &va, (char *)symname, &cvp, NULL, error);
	316	if (!error && cvp) {
1da177e4 LT	317	ip = LINVFS_GET_IP(cvp);
	318	d_instantiate(dentry, ip);
	319	validate_fields(dir);
	320	validate_fields(ip); /* size needs update */
	321	}
	322	return -error;
	323	}
	324
	325	STATIC int
	326	linvfs_rmdir(
	327	struct inode *dir,
	328	struct dentry *dentry)
	329	{
	330	struct inode *inode = dentry->d_inode;
	331	vnode_t *dvp = LINVFS_GET_VP(dir);
	332	int error;
	333
	334	VOP_RMDIR(dvp, dentry, NULL, error);
	335	if (!error) {
	336	validate_fields(inode);
	337	validate_fields(dir);
	338	}
	339	return -error;
	340	}
	341
	342	STATIC int
	343	linvfs_rename(
	344	struct inode *odir,
	345	struct dentry *odentry,
	346	struct inode *ndir,
	347	struct dentry *ndentry)
	348	{
	349	struct inode *new_inode = ndentry->d_inode;
	350	vnode_t fvp; / from directory */
	351	vnode_t tvp; / target directory */
	352	int error;
	353
	354	fvp = LINVFS_GET_VP(odir);
	355	tvp = LINVFS_GET_VP(ndir);
	356
	357	VOP_RENAME(fvp, odentry, tvp, ndentry, NULL, error);
	358	if (error)
	359	return -error;
	360
	361	if (new_inode)
	362	validate_fields(new_inode);
	363
	364	validate_fields(odir);
	365	if (ndir != odir)
	366	validate_fields(ndir);
	367	return 0;
	368	}
	369
	370	/*
	371	* careful here - this function can get called recursively, so
	372	* we need to be very careful about how much stack we use.
	373	* uio is kmalloced for this reason...
	374	*/
008b150a	375	STATIC void *
1da177e4 LT	376	linvfs_follow_link(
	377	struct dentry *dentry,
	378	struct nameidata *nd)
	379	{
	380	vnode_t *vp;
	381	uio_t *uio;
	382	iovec_t iov;
	383	int error;
	384	char *link;
	385
	386	ASSERT(dentry);
	387	ASSERT(nd);
	388
	389	link = (char *)kmalloc(MAXNAMELEN+1, GFP_KERNEL);
	390	if (!link) {
	391	nd_set_link(nd, ERR_PTR(-ENOMEM));
008b150a	392	return NULL;
1da177e4 LT	393	}
	394
	395	uio = (uio_t *)kmalloc(sizeof(uio_t), GFP_KERNEL);
	396	if (!uio) {
	397	kfree(link);
	398	nd_set_link(nd, ERR_PTR(-ENOMEM));
008b150a	399	return NULL;
1da177e4 LT	400	}
	401
	402	vp = LINVFS_GET_VP(dentry->d_inode);
	403
	404	iov.iov_base = link;
	405	iov.iov_len = MAXNAMELEN;
	406
	407	uio->uio_iov = &iov;
	408	uio->uio_offset = 0;
	409	uio->uio_segflg = UIO_SYSSPACE;
	410	uio->uio_resid = MAXNAMELEN;
	411	uio->uio_iovcnt = 1;
	412
	413	VOP_READLINK(vp, uio, 0, NULL, error);
	414	if (error) {
	415	kfree(link);
	416	link = ERR_PTR(-error);
	417	} else {
	418	link[MAXNAMELEN - uio->uio_resid] = '\0';
	419	}
	420	kfree(uio);
	421
	422	nd_set_link(nd, link);
008b150a	423	return NULL;
1da177e4 LT	424	}
1da177e4 LT	425
008b150a	426	static void linvfs_put_link(struct dentry dentry, struct nameidata nd, void *p)
1da177e4 LT	427	{
	428	char *s = nd_get_link(nd);
	429	if (!IS_ERR(s))
	430	kfree(s);
	431	}
	432
	433	#ifdef CONFIG_XFS_POSIX_ACL
	434	STATIC int
	435	linvfs_permission(
	436	struct inode *inode,
	437	int mode,
	438	struct nameidata *nd)
	439	{
	440	vnode_t *vp = LINVFS_GET_VP(inode);
	441	int error;
	442
	443	mode <<= 6; /* convert from linux to vnode access bits */
	444	VOP_ACCESS(vp, mode, NULL, error);
	445	return -error;
	446	}
	447	#else
	448	#define linvfs_permission NULL
	449	#endif
	450
	451	STATIC int
	452	linvfs_getattr(
	453	struct vfsmount *mnt,
	454	struct dentry *dentry,
	455	struct kstat *stat)
	456	{
	457	struct inode *inode = dentry->d_inode;
	458	vnode_t *vp = LINVFS_GET_VP(inode);
	459	int error = 0;
	460
	461	if (unlikely(vp->v_flag & VMODIFIED))
	462	error = vn_revalidate(vp);
	463	if (!error)
	464	generic_fillattr(inode, stat);
	465	return 0;
	466	}
	467
	468	STATIC int
	469	linvfs_setattr(
	470	struct dentry *dentry,
	471	struct iattr *attr)
	472	{
	473	struct inode *inode = dentry->d_inode;
	474	unsigned int ia_valid = attr->ia_valid;
	475	vnode_t *vp = LINVFS_GET_VP(inode);
	476	vattr_t vattr;
	477	int flags = 0;
	478	int error;
	479
	480	memset(&vattr, 0, sizeof(vattr_t));
	481	if (ia_valid & ATTR_UID) {
	482	vattr.va_mask \|= XFS_AT_UID;
	483	vattr.va_uid = attr->ia_uid;
	484	}
	485	if (ia_valid & ATTR_GID) {
	486	vattr.va_mask \|= XFS_AT_GID;
	487	vattr.va_gid = attr->ia_gid;
	488	}
	489	if (ia_valid & ATTR_SIZE) {
	490	vattr.va_mask \|= XFS_AT_SIZE;
491	vattr.va_size = attr->ia_size;
492	}
493	if (ia_valid & ATTR_ATIME) {
494	vattr.va_mask \|= XFS_AT_ATIME;
495	vattr.va_atime = attr->ia_atime;
496	}
497	if (ia_valid & ATTR_MTIME) {
498	vattr.va_mask \|= XFS_AT_MTIME;
499	vattr.va_mtime = attr->ia_mtime;
500	}
501	if (ia_valid & ATTR_CTIME) {
502	vattr.va_mask \|= XFS_AT_CTIME;
503	vattr.va_ctime = attr->ia_ctime;
504	}
505	if (ia_valid & ATTR_MODE) {
506	vattr.va_mask \|= XFS_AT_MODE;
507	vattr.va_mode = attr->ia_mode;
508	if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
509	inode->i_mode &= ~S_ISGID;
510	}
511
512	if (ia_valid & (ATTR_MTIME_SET \| ATTR_ATIME_SET))
513	flags \|= ATTR_UTIME;
514	#ifdef ATTR_NO_BLOCK
515	if ((ia_valid & ATTR_NO_BLOCK))
516	flags \|= ATTR_NONBLOCK;
517	#endif
518
519	VOP_SETATTR(vp, &vattr, flags, NULL, error);
520	if (error)
521	return -error;
522	vn_revalidate(vp);
523	return error;
524	}
525
526	STATIC void
527	linvfs_truncate(
528	struct inode *inode)
529	{
530	block_truncate_page(inode->i_mapping, inode->i_size, linvfs_get_block);
531	}
532
533	STATIC int
534	linvfs_setxattr(
535	struct dentry *dentry,
536	const char *name,
537	const void *data,
538	size_t size,
539	int flags)
540	{
541	vnode_t *vp = LINVFS_GET_VP(dentry->d_inode);
542	char attr = (char )name;
543	attrnames_t *namesp;
544	int xflags = 0;
545	int error;
546
547	namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
548	if (!namesp)
549	return -EOPNOTSUPP;
550	attr += namesp->attr_namelen;
551	error = namesp->attr_capable(vp, NULL);
552	if (error)
553	return error;
554
555	/* Convert Linux syscall to XFS internal ATTR flags */
556	if (flags & XATTR_CREATE)
557	xflags \|= ATTR_CREATE;
558	if (flags & XATTR_REPLACE)
559	xflags \|= ATTR_REPLACE;
560	xflags \|= namesp->attr_flag;
561	return namesp->attr_set(vp, attr, (void *)data, size, xflags);
562	}
563
564	STATIC ssize_t
565	linvfs_getxattr(
566	struct dentry *dentry,
567	const char *name,
568	void *data,
569	size_t size)
570	{
571	vnode_t *vp = LINVFS_GET_VP(dentry->d_inode);
572	char attr = (char )name;
573	attrnames_t *namesp;
574	int xflags = 0;
575	ssize_t error;
576
577	namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
578	if (!namesp)
579	return -EOPNOTSUPP;
580	attr += namesp->attr_namelen;
581	error = namesp->attr_capable(vp, NULL);
582	if (error)
583	return error;
584
585	/* Convert Linux syscall to XFS internal ATTR flags */
586	if (!size) {
587	xflags \|= ATTR_KERNOVAL;
588	data = NULL;
589	}
590	xflags \|= namesp->attr_flag;
591	return namesp->attr_get(vp, attr, (void *)data, size, xflags);
592	}
593
594	STATIC ssize_t
595	linvfs_listxattr(
596	struct dentry *dentry,
597	char *data,
598	size_t size)
599	{
600	vnode_t *vp = LINVFS_GET_VP(dentry->d_inode);
601	int error, xflags = ATTR_KERNAMELS;
602	ssize_t result;
603
604	if (!size)
605	xflags \|= ATTR_KERNOVAL;
606	xflags \|= capable(CAP_SYS_ADMIN) ? ATTR_KERNFULLS : ATTR_KERNORMALS;
607
608	error = attr_generic_list(vp, data, size, xflags, &result);
609	if (error < 0)
610	return error;
611	return result;
612	}
613
614	STATIC int
615	linvfs_removexattr(
616	struct dentry *dentry,
617	const char *name)
618	{
619	vnode_t *vp = LINVFS_GET_VP(dentry->d_inode);
620	char attr = (char )name;
621	attrnames_t *namesp;
622	int xflags = 0;
623	int error;
624
625	namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
626	if (!namesp)
627	return -EOPNOTSUPP;
628	attr += namesp->attr_namelen;
629	error = namesp->attr_capable(vp, NULL);
630	if (error)
631	return error;
632	xflags \|= namesp->attr_flag;
633	return namesp->attr_remove(vp, attr, xflags);
634	}
635
636
637	struct inode_operations linvfs_file_inode_operations = {
638	.permission = linvfs_permission,
639	.truncate = linvfs_truncate,
640	.getattr = linvfs_getattr,
641	.setattr = linvfs_setattr,
642	.setxattr = linvfs_setxattr,
643	.getxattr = linvfs_getxattr,
644	.listxattr = linvfs_listxattr,
645	.removexattr = linvfs_removexattr,
646	};
647
648	struct inode_operations linvfs_dir_inode_operations = {
649	.create = linvfs_create,
650	.lookup = linvfs_lookup,
651	.link = linvfs_link,
652	.unlink = linvfs_unlink,
653	.symlink = linvfs_symlink,
654	.mkdir = linvfs_mkdir,
655	.rmdir = linvfs_rmdir,
656	.mknod = linvfs_mknod,
657	.rename = linvfs_rename,
658	.permission = linvfs_permission,
659	.getattr = linvfs_getattr,
660	.setattr = linvfs_setattr,
661	.setxattr = linvfs_setxattr,
662	.getxattr = linvfs_getxattr,
663	.listxattr = linvfs_listxattr,
664	.removexattr = linvfs_removexattr,
665	};
666
667	struct inode_operations linvfs_symlink_inode_operations = {
668	.readlink = generic_readlink,
669	.follow_link = linvfs_follow_link,
670	.put_link = linvfs_put_link,
671	.permission = linvfs_permission,
672	.getattr = linvfs_getattr,
673	.setattr = linvfs_setattr,
674	.setxattr = linvfs_setxattr,
675	.getxattr = linvfs_getxattr,
676	.listxattr = linvfs_listxattr,
677	.removexattr = linvfs_removexattr,
678	};