xfs_iops.c 28.5 KB
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/*
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 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
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 *
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 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
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 * published by the Free Software Foundation.
 *
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 * 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.  See the
 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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 */
#include "xfs.h"
#include "xfs_fs.h"
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#include "xfs_acl.h"
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#include "xfs_log.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_alloc.h"
#include "xfs_quota.h"
#include "xfs_mount.h"
#include "xfs_bmap_btree.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_bmap.h"
#include "xfs_rtalloc.h"
#include "xfs_error.h"
#include "xfs_itable.h"
#include "xfs_attr.h"
#include "xfs_buf_item.h"
#include "xfs_utils.h"
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#include "xfs_vnodeops.h"
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#include "xfs_inode_item.h"
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#include "xfs_trace.h"
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#include <linux/capability.h>
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#include <linux/xattr.h>
#include <linux/namei.h>
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#include <linux/posix_acl.h>
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#include <linux/security.h>
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#include <linux/fiemap.h>
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#include <linux/slab.h>
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static int
xfs_initxattrs(
	struct inode		*inode,
	const struct xattr	*xattr_array,
	void			*fs_info)
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{
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	const struct xattr	*xattr;
	struct xfs_inode	*ip = XFS_I(inode);
	int			error = 0;
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	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;
}

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/*
 * 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).
 */
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STATIC int
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xfs_init_security(
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	struct inode	*inode,
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	struct inode	*dir,
	const struct qstr *qstr)
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{
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	return security_inode_init_security(inode, dir, qstr,
					    &xfs_initxattrs, NULL);
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}

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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;
}

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STATIC void
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xfs_cleanup_inode(
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	struct inode	*dir,
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	struct inode	*inode,
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	struct dentry	*dentry)
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{
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	struct xfs_name	teardown;
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	/* Oh, the horror.
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	 * If we can't add the ACL or we fail in
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	 * xfs_init_security we must back out.
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	 * ENOSPC can hit here, among other things.
	 */
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	xfs_dentry_to_name(&teardown, dentry);
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	xfs_remove(XFS_I(dir), &teardown, XFS_I(inode));
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	iput(inode);
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}

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STATIC int
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xfs_vn_mknod(
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	struct inode	*dir,
	struct dentry	*dentry,
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	umode_t		mode,
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	dev_t		rdev)
{
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	struct inode	*inode;
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	struct xfs_inode *ip = NULL;
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	struct posix_acl *default_acl = NULL;
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	struct xfs_name	name;
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	int		error;

	/*
	 * Irix uses Missed'em'V split, but doesn't want to see
	 * the upper 5 bits of (14bit) major.
	 */
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	if (S_ISCHR(mode) || S_ISBLK(mode)) {
		if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
			return -EINVAL;
		rdev = sysv_encode_dev(rdev);
	} else {
		rdev = 0;
	}
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	if (IS_POSIXACL(dir)) {
		default_acl = xfs_get_acl(dir, ACL_TYPE_DEFAULT);
		if (IS_ERR(default_acl))
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			return PTR_ERR(default_acl);
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		if (!default_acl)
			mode &= ~current_umask();
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	}
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	xfs_dentry_to_name(&name, dentry);
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	error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip);
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	if (unlikely(error))
		goto out_free_acl;
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	inode = VFS_I(ip);
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	error = xfs_init_security(inode, dir, &dentry->d_name);
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	if (unlikely(error))
		goto out_cleanup_inode;

	if (default_acl) {
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		error = -xfs_inherit_acl(inode, default_acl);
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		default_acl = NULL;
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		if (unlikely(error))
			goto out_cleanup_inode;
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	}


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	d_instantiate(dentry, inode);
	return -error;

 out_cleanup_inode:
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	xfs_cleanup_inode(dir, inode, dentry);
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 out_free_acl:
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	posix_acl_release(default_acl);
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	return -error;
}

STATIC int
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xfs_vn_create(
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	struct inode	*dir,
	struct dentry	*dentry,
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	umode_t		mode,
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	bool		flags)
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{
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	return xfs_vn_mknod(dir, dentry, mode, 0);
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}

STATIC int
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xfs_vn_mkdir(
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	struct inode	*dir,
	struct dentry	*dentry,
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	umode_t		mode)
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{
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	return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0);
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}

STATIC struct dentry *
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xfs_vn_lookup(
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	struct inode	*dir,
	struct dentry	*dentry,
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	unsigned int flags)
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{
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	struct xfs_inode *cip;
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	struct xfs_name	name;
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	int		error;

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

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	xfs_dentry_to_name(&name, dentry);
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	error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
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	if (unlikely(error)) {
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		if (unlikely(error != ENOENT))
			return ERR_PTR(-error);
		d_add(dentry, NULL);
		return NULL;
	}

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	return d_splice_alias(VFS_I(cip), dentry);
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}

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STATIC struct dentry *
xfs_vn_ci_lookup(
	struct inode	*dir,
	struct dentry	*dentry,
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	unsigned int flags)
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{
	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);
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		/*
		 * call d_add(dentry, NULL) here when d_drop_negative_children
		 * is called in xfs_vn_mknod (ie. allow negative dentries
		 * with CI filesystems).
		 */
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		return NULL;
	}

	/* if exact match, just splice and exit */
	if (!ci_name.name)
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		return d_splice_alias(VFS_I(ip), dentry);
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	/* else case-insensitive match... */
	dname.name = ci_name.name;
	dname.len = ci_name.len;
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	dentry = d_add_ci(dentry, VFS_I(ip), &dname);
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	kmem_free(ci_name.name);
	return dentry;
}

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STATIC int
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xfs_vn_link(
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	struct dentry	*old_dentry,
	struct inode	*dir,
	struct dentry	*dentry)
{
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	struct inode	*inode = old_dentry->d_inode;
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	struct xfs_name	name;
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	int		error;

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	xfs_dentry_to_name(&name, dentry);
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	error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
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	if (unlikely(error))
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		return -error;

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	ihold(inode);
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	d_instantiate(dentry, inode);
	return 0;
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}

STATIC int
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xfs_vn_unlink(
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	struct inode	*dir,
	struct dentry	*dentry)
{
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	struct xfs_name	name;
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	int		error;

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	xfs_dentry_to_name(&name, dentry);
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	error = -xfs_remove(XFS_I(dir), &name, XFS_I(dentry->d_inode));
	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;
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}

STATIC int
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xfs_vn_symlink(
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	struct inode	*dir,
	struct dentry	*dentry,
	const char	*symname)
{
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	struct inode	*inode;
	struct xfs_inode *cip = NULL;
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	struct xfs_name	name;
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	int		error;
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	umode_t		mode;
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	mode = S_IFLNK |
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		(irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
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	xfs_dentry_to_name(&name, dentry);
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	error = xfs_symlink(XFS_I(dir), &name, symname, mode, &cip);
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	if (unlikely(error))
		goto out;

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	inode = VFS_I(cip);
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	error = xfs_init_security(inode, dir, &dentry->d_name);
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	if (unlikely(error))
		goto out_cleanup_inode;

	d_instantiate(dentry, inode);
	return 0;

 out_cleanup_inode:
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	xfs_cleanup_inode(dir, inode, dentry);
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 out:
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	return -error;
}

STATIC int
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xfs_vn_rename(
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	struct inode	*odir,
	struct dentry	*odentry,
	struct inode	*ndir,
	struct dentry	*ndentry)
{
	struct inode	*new_inode = ndentry->d_inode;
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	struct xfs_name	oname;
	struct xfs_name	nname;
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	xfs_dentry_to_name(&oname, odentry);
	xfs_dentry_to_name(&nname, ndentry);

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	return -xfs_rename(XFS_I(odir), &oname, XFS_I(odentry->d_inode),
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			   XFS_I(ndir), &nname, new_inode ?
			   			XFS_I(new_inode) : NULL);
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}

/*
 * 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...
 */
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STATIC void *
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xfs_vn_follow_link(
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	struct dentry		*dentry,
	struct nameidata	*nd)
{
	char			*link;
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	int			error = -ENOMEM;
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	link = kmalloc(MAXPATHLEN+1, GFP_KERNEL);
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	if (!link)
		goto out_err;
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	error = -xfs_readlink(XFS_I(dentry->d_inode), link);
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	if (unlikely(error))
		goto out_kfree;
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	nd_set_link(nd, link);
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	return NULL;
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 out_kfree:
	kfree(link);
 out_err:
	nd_set_link(nd, ERR_PTR(error));
	return NULL;
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}

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STATIC void
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xfs_vn_put_link(
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	struct dentry	*dentry,
	struct nameidata *nd,
	void		*p)
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{
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	char		*s = nd_get_link(nd);

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	if (!IS_ERR(s))
		kfree(s);
}

STATIC int
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xfs_vn_getattr(
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	struct vfsmount		*mnt,
	struct dentry		*dentry,
	struct kstat		*stat)
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{
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	struct inode		*inode = dentry->d_inode;
	struct xfs_inode	*ip = XFS_I(inode);
	struct xfs_mount	*mp = ip->i_mount;

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	trace_xfs_getattr(ip);
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	if (XFS_FORCED_SHUTDOWN(mp))
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		return -XFS_ERROR(EIO);
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	stat->size = XFS_ISIZE(ip);
	stat->dev = inode->i_sb->s_dev;
	stat->mode = ip->i_d.di_mode;
	stat->nlink = ip->i_d.di_nlink;
	stat->uid = ip->i_d.di_uid;
	stat->gid = ip->i_d.di_gid;
	stat->ino = ip->i_ino;
	stat->atime = inode->i_atime;
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	stat->mtime = inode->i_mtime;
	stat->ctime = inode->i_ctime;
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	stat->blocks =
		XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);


	switch (inode->i_mode & S_IFMT) {
	case S_IFBLK:
	case S_IFCHR:
		stat->blksize = BLKDEV_IOSIZE;
		stat->rdev = MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff,
				   sysv_minor(ip->i_df.if_u2.if_rdev));
		break;
	default:
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		if (XFS_IS_REALTIME_INODE(ip)) {
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			/*
			 * 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;
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	}
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	return 0;
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}

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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;
	uid_t			uid = 0, iuid = 0;
	gid_t			gid = 0, igid = 0;
	struct xfs_dquot	*udqp = NULL, *gdqp = NULL;
	struct xfs_dquot	*olddquot1 = NULL, *olddquot2 = NULL;

	trace_xfs_setattr(ip);

	if (mp->m_flags & XFS_MOUNT_RDONLY)
		return XFS_ERROR(EROFS);

	if (XFS_FORCED_SHUTDOWN(mp))
		return XFS_ERROR(EIO);

	error = -inode_change_ok(inode, iattr);
	if (error)
		return XFS_ERROR(error);

	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 = ip->i_d.di_uid;
		}
		if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
			gid = iattr->ia_gid;
			qflags |= XFS_QMOPT_GQUOTA;
		}  else {
			gid = ip->i_d.di_gid;
		}

		/*
		 * We take a reference when we initialize udqp and gdqp,
		 * so it is important that we never blindly double trip on
		 * the same variable. See xfs_create() for an example.
		 */
		ASSERT(udqp == NULL);
		ASSERT(gdqp == NULL);
		error = xfs_qm_vop_dqalloc(ip, uid, gid, xfs_get_projid(ip),
					 qflags, &udqp, &gdqp);
		if (error)
			return error;
	}

	tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE);
	error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0);
	if (error)
		goto out_dqrele;

	xfs_ilock(ip, XFS_ILOCK_EXCL);

	/*
	 * 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 = ip->i_d.di_uid;
		igid = ip->i_d.di_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) && iuid != uid) ||
		     (XFS_IS_GQUOTA_ON(mp) && igid != gid))) {
			ASSERT(tp);
			error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
						capable(CAP_FOWNER) ?
						XFS_QMOPT_FORCE_RES : 0);
			if (error)	/* out of quota */
				goto out_trans_cancel;
		}
	}

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	xfs_trans_ijoin(tp, ip, 0);
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	/*
	 * 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 ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) &&
		    !capable(CAP_FSETID))
			ip->i_d.di_mode &= ~(S_ISUID|S_ISGID);

		/*
		 * Change the ownerships and register quota modifications
		 * in the transaction.
		 */
		if (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 = uid;
			inode->i_uid = uid;
		}
		if (igid != gid) {
			if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
				ASSERT(!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 = gid;
			inode->i_gid = gid;
		}
	}

	/*
	 * Change file access modes.
	 */
	if (mask & ATTR_MODE) {
		umode_t mode = iattr->ia_mode;

		if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
			mode &= ~S_ISGID;

		ip->i_d.di_mode &= S_IFMT;
		ip->i_d.di_mode |= mode & ~S_IFMT;

		inode->i_mode &= S_IFMT;
		inode->i_mode |= mode & ~S_IFMT;
	}

	/*
	 * Change file access or modified times.
	 */
	if (mask & ATTR_ATIME) {
		inode->i_atime = iattr->ia_atime;
		ip->i_d.di_atime.t_sec = iattr->ia_atime.tv_sec;
		ip->i_d.di_atime.t_nsec = iattr->ia_atime.tv_nsec;
	}
	if (mask & ATTR_CTIME) {
		inode->i_ctime = iattr->ia_ctime;
		ip->i_d.di_ctime.t_sec = iattr->ia_ctime.tv_sec;
		ip->i_d.di_ctime.t_nsec = iattr->ia_ctime.tv_nsec;
	}
	if (mask & ATTR_MTIME) {
		inode->i_mtime = iattr->ia_mtime;
		ip->i_d.di_mtime.t_sec = iattr->ia_mtime.tv_sec;
		ip->i_d.di_mtime.t_nsec = iattr->ia_mtime.tv_nsec;
	}

	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);

	XFS_STATS_INC(xs_ig_attrchg);

	if (mp->m_flags & XFS_MOUNT_WSYNC)
		xfs_trans_set_sync(tp);
	error = xfs_trans_commit(tp, 0);

	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 XFS_ERROR(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 = -xfs_acl_chmod(inode);
		if (error)
			return XFS_ERROR(error);
	}

	return 0;

out_trans_cancel:
	xfs_trans_cancel(tp, 0);
	xfs_iunlock(ip, XFS_ILOCK_EXCL);
out_dqrele:
	xfs_qm_dqrele(udqp);
	xfs_qm_dqrele(gdqp);
	return error;
}

/*
 * Truncate file.  Must have write permission and not be a directory.
 */
int
xfs_setattr_size(
	struct xfs_inode	*ip,
	struct iattr		*iattr,
	int			flags)
{
	struct xfs_mount	*mp = ip->i_mount;
	struct inode		*inode = VFS_I(ip);
	int			mask = iattr->ia_valid;
697
	xfs_off_t		oldsize, newsize;
C
Christoph Hellwig 已提交
698 699
	struct xfs_trans	*tp;
	int			error;
700
	uint			lock_flags = 0;
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	uint			commit_flags = 0;

	trace_xfs_setattr(ip);

	if (mp->m_flags & XFS_MOUNT_RDONLY)
		return XFS_ERROR(EROFS);

	if (XFS_FORCED_SHUTDOWN(mp))
		return XFS_ERROR(EIO);

	error = -inode_change_ok(inode, iattr);
	if (error)
		return XFS_ERROR(error);

	ASSERT(S_ISREG(ip->i_d.di_mode));
	ASSERT((mask & (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
			ATTR_MTIME_SET|ATTR_KILL_SUID|ATTR_KILL_SGID|
			ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0);

720
	if (!(flags & XFS_ATTR_NOLOCK)) {
C
Christoph Hellwig 已提交
721
		lock_flags |= XFS_IOLOCK_EXCL;
722 723
		xfs_ilock(ip, lock_flags);
	}
C
Christoph Hellwig 已提交
724

725
	oldsize = inode->i_size;
726 727
	newsize = iattr->ia_size;

C
Christoph Hellwig 已提交
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	/*
	 * Short circuit the truncate case for zero length files.
	 */
731
	if (newsize == 0 && oldsize == 0 && ip->i_d.di_nextents == 0) {
732 733 734 735 736 737 738 739 740
		if (!(mask & (ATTR_CTIME|ATTR_MTIME)))
			goto out_unlock;

		/*
		 * Use the regular setattr path to update the timestamps.
		 */
		xfs_iunlock(ip, lock_flags);
		iattr->ia_valid &= ~ATTR_SIZE;
		return xfs_setattr_nonsize(ip, iattr, 0);
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Christoph Hellwig 已提交
741 742 743 744 745
	}

	/*
	 * Make sure that the dquots are attached to the inode.
	 */
746
	error = xfs_qm_dqattach(ip, 0);
C
Christoph Hellwig 已提交
747 748 749 750 751 752 753 754 755 756
	if (error)
		goto out_unlock;

	/*
	 * Now we can make the changes.  Before we join the inode to the
	 * transaction, take care of the part of the truncation that must be
	 * done without the inode lock.  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.
	 */
757
	if (newsize > oldsize) {
C
Christoph Hellwig 已提交
758 759 760 761 762 763
		/*
		 * Do the first part of growing a file: zero any data in the
		 * last block that is beyond the old EOF.  We need to do this
		 * before the inode is joined to the transaction to modify
		 * i_size.
		 */
764
		error = xfs_zero_eof(ip, newsize, oldsize);
C
Christoph Hellwig 已提交
765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780
		if (error)
			goto out_unlock;
	}

	/*
	 * 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.
	 *
	 * Only flush from the on disk size to the smaller of the in memory
	 * file size or the new size as that's the range we really care about
	 * here and prevents waiting for other data not within the range we
	 * care about here.
	 */
781 782
	if (oldsize != ip->i_d.di_size && newsize > ip->i_d.di_size) {
		error = xfs_flush_pages(ip, ip->i_d.di_size, newsize, 0,
783
					FI_NONE);
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Christoph Hellwig 已提交
784 785 786 787 788
		if (error)
			goto out_unlock;
	}

	/*
C
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789
	 * Wait for all direct I/O to complete.
C
Christoph Hellwig 已提交
790
	 */
C
Christoph Hellwig 已提交
791
	inode_dio_wait(inode);
C
Christoph Hellwig 已提交
792

793
	error = -block_truncate_page(inode->i_mapping, newsize, xfs_get_blocks);
C
Christoph Hellwig 已提交
794 795 796 797 798 799 800 801 802 803
	if (error)
		goto out_unlock;

	tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE);
	error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
				 XFS_TRANS_PERM_LOG_RES,
				 XFS_ITRUNCATE_LOG_COUNT);
	if (error)
		goto out_trans_cancel;

804
	truncate_setsize(inode, newsize);
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Christoph Hellwig 已提交
805 806 807 808 809 810

	commit_flags = XFS_TRANS_RELEASE_LOG_RES;
	lock_flags |= XFS_ILOCK_EXCL;

	xfs_ilock(ip, XFS_ILOCK_EXCL);

811
	xfs_trans_ijoin(tp, ip, 0);
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	/*
	 * 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.
	 */
823
	if (newsize != oldsize && (!(mask & (ATTR_CTIME | ATTR_MTIME)))) {
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Christoph Hellwig 已提交
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		iattr->ia_ctime = iattr->ia_mtime =
			current_fs_time(inode->i_sb);
		mask |= ATTR_CTIME | ATTR_MTIME;
	}

829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845
	/*
	 * 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);
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		if (error)
			goto out_trans_abort;

		/*
		 * 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);
	}

	if (mask & ATTR_CTIME) {
		inode->i_ctime = iattr->ia_ctime;
		ip->i_d.di_ctime.t_sec = iattr->ia_ctime.tv_sec;
		ip->i_d.di_ctime.t_nsec = iattr->ia_ctime.tv_nsec;
	}
	if (mask & ATTR_MTIME) {
		inode->i_mtime = iattr->ia_mtime;
		ip->i_d.di_mtime.t_sec = iattr->ia_mtime.tv_sec;
		ip->i_d.di_mtime.t_nsec = iattr->ia_mtime.tv_nsec;
	}

	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);

	XFS_STATS_INC(xs_ig_attrchg);

	if (mp->m_flags & XFS_MOUNT_WSYNC)
		xfs_trans_set_sync(tp);

	error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
out_unlock:
	if (lock_flags)
		xfs_iunlock(ip, lock_flags);
	return error;

out_trans_abort:
	commit_flags |= XFS_TRANS_ABORT;
out_trans_cancel:
	xfs_trans_cancel(tp, commit_flags);
	goto out_unlock;
}

L
Linus Torvalds 已提交
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STATIC int
891
xfs_vn_setattr(
L
Linus Torvalds 已提交
892
	struct dentry	*dentry,
893
	struct iattr	*iattr)
L
Linus Torvalds 已提交
894
{
C
Christoph Hellwig 已提交
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	if (iattr->ia_valid & ATTR_SIZE)
		return -xfs_setattr_size(XFS_I(dentry->d_inode), iattr, 0);
	return -xfs_setattr_nonsize(XFS_I(dentry->d_inode), iattr, 0);
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Linus Torvalds 已提交
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}

E
Eric Sandeen 已提交
900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966
#define XFS_FIEMAP_FLAGS	(FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR)

/*
 * Call fiemap helper to fill in user data.
 * Returns positive errors to xfs_getbmap.
 */
STATIC int
xfs_fiemap_format(
	void			**arg,
	struct getbmapx		*bmv,
	int			*full)
{
	int			error;
	struct fiemap_extent_info *fieinfo = *arg;
	u32			fiemap_flags = 0;
	u64			logical, physical, length;

	/* Do nothing for a hole */
	if (bmv->bmv_block == -1LL)
		return 0;

	logical = BBTOB(bmv->bmv_offset);
	physical = BBTOB(bmv->bmv_block);
	length = BBTOB(bmv->bmv_length);

	if (bmv->bmv_oflags & BMV_OF_PREALLOC)
		fiemap_flags |= FIEMAP_EXTENT_UNWRITTEN;
	else if (bmv->bmv_oflags & BMV_OF_DELALLOC) {
		fiemap_flags |= FIEMAP_EXTENT_DELALLOC;
		physical = 0;   /* no block yet */
	}
	if (bmv->bmv_oflags & BMV_OF_LAST)
		fiemap_flags |= FIEMAP_EXTENT_LAST;

	error = fiemap_fill_next_extent(fieinfo, logical, physical,
					length, fiemap_flags);
	if (error > 0) {
		error = 0;
		*full = 1;	/* user array now full */
	}

	return -error;
}

STATIC int
xfs_vn_fiemap(
	struct inode		*inode,
	struct fiemap_extent_info *fieinfo,
	u64			start,
	u64			length)
{
	xfs_inode_t		*ip = XFS_I(inode);
	struct getbmapx		bm;
	int			error;

	error = fiemap_check_flags(fieinfo, XFS_FIEMAP_FLAGS);
	if (error)
		return error;

	/* Set up bmap header for xfs internal routine */
	bm.bmv_offset = BTOBB(start);
	/* Special case for whole file */
	if (length == FIEMAP_MAX_OFFSET)
		bm.bmv_length = -1LL;
	else
		bm.bmv_length = BTOBB(length);

967
	/* We add one because in getbmap world count includes the header */
T
Tao Ma 已提交
968 969 970 971
	bm.bmv_count = !fieinfo->fi_extents_max ? MAXEXTNUM :
					fieinfo->fi_extents_max + 1;
	bm.bmv_count = min_t(__s32, bm.bmv_count,
			     (PAGE_SIZE * 16 / sizeof(struct getbmapx)));
T
Tao Ma 已提交
972
	bm.bmv_iflags = BMV_IF_PREALLOC | BMV_IF_NO_HOLES;
E
Eric Sandeen 已提交
973 974 975 976 977 978 979 980 981 982 983 984
	if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR)
		bm.bmv_iflags |= BMV_IF_ATTRFORK;
	if (!(fieinfo->fi_flags & FIEMAP_FLAG_SYNC))
		bm.bmv_iflags |= BMV_IF_DELALLOC;

	error = xfs_getbmap(ip, &bm, xfs_fiemap_format, fieinfo);
	if (error)
		return -error;

	return 0;
}

985
static const struct inode_operations xfs_inode_operations = {
986
	.get_acl		= xfs_get_acl,
987 988
	.getattr		= xfs_vn_getattr,
	.setattr		= xfs_vn_setattr,
989 990 991
	.setxattr		= generic_setxattr,
	.getxattr		= generic_getxattr,
	.removexattr		= generic_removexattr,
992
	.listxattr		= xfs_vn_listxattr,
E
Eric Sandeen 已提交
993
	.fiemap			= xfs_vn_fiemap,
L
Linus Torvalds 已提交
994 995
};

996
static const struct inode_operations xfs_dir_inode_operations = {
997 998 999 1000 1001 1002
	.create			= xfs_vn_create,
	.lookup			= xfs_vn_lookup,
	.link			= xfs_vn_link,
	.unlink			= xfs_vn_unlink,
	.symlink		= xfs_vn_symlink,
	.mkdir			= xfs_vn_mkdir,
1003 1004 1005 1006 1007 1008 1009
	/*
	 * 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,
1010 1011
	.mknod			= xfs_vn_mknod,
	.rename			= xfs_vn_rename,
1012
	.get_acl		= xfs_get_acl,
1013 1014
	.getattr		= xfs_vn_getattr,
	.setattr		= xfs_vn_setattr,
1015 1016 1017
	.setxattr		= generic_setxattr,
	.getxattr		= generic_getxattr,
	.removexattr		= generic_removexattr,
1018
	.listxattr		= xfs_vn_listxattr,
L
Linus Torvalds 已提交
1019 1020
};

1021
static const struct inode_operations xfs_dir_ci_inode_operations = {
1022 1023 1024 1025 1026 1027
	.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,
1028 1029 1030 1031 1032 1033 1034
	/*
	 * 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,
1035 1036
	.mknod			= xfs_vn_mknod,
	.rename			= xfs_vn_rename,
1037
	.get_acl		= xfs_get_acl,
1038 1039
	.getattr		= xfs_vn_getattr,
	.setattr		= xfs_vn_setattr,
1040 1041 1042
	.setxattr		= generic_setxattr,
	.getxattr		= generic_getxattr,
	.removexattr		= generic_removexattr,
1043 1044 1045
	.listxattr		= xfs_vn_listxattr,
};

1046
static const struct inode_operations xfs_symlink_inode_operations = {
L
Linus Torvalds 已提交
1047
	.readlink		= generic_readlink,
1048 1049
	.follow_link		= xfs_vn_follow_link,
	.put_link		= xfs_vn_put_link,
1050
	.get_acl		= xfs_get_acl,
1051 1052
	.getattr		= xfs_vn_getattr,
	.setattr		= xfs_vn_setattr,
1053 1054 1055
	.setxattr		= generic_setxattr,
	.getxattr		= generic_getxattr,
	.removexattr		= generic_removexattr,
1056
	.listxattr		= xfs_vn_listxattr,
L
Linus Torvalds 已提交
1057
};
1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088

STATIC void
xfs_diflags_to_iflags(
	struct inode		*inode,
	struct xfs_inode	*ip)
{
	if (ip->i_d.di_flags & XFS_DIFLAG_IMMUTABLE)
		inode->i_flags |= S_IMMUTABLE;
	else
		inode->i_flags &= ~S_IMMUTABLE;
	if (ip->i_d.di_flags & XFS_DIFLAG_APPEND)
		inode->i_flags |= S_APPEND;
	else
		inode->i_flags &= ~S_APPEND;
	if (ip->i_d.di_flags & XFS_DIFLAG_SYNC)
		inode->i_flags |= S_SYNC;
	else
		inode->i_flags &= ~S_SYNC;
	if (ip->i_d.di_flags & XFS_DIFLAG_NOATIME)
		inode->i_flags |= S_NOATIME;
	else
		inode->i_flags &= ~S_NOATIME;
}

/*
 * Initialize the Linux inode, set up the operation vectors and
 * unlock the 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.
1089 1090 1091 1092
 *
 * We are always called with an uninitialised linux inode here.
 * We need to initialise the necessary fields and take a reference
 * on it.
1093 1094 1095 1096 1097
 */
void
xfs_setup_inode(
	struct xfs_inode	*ip)
{
1098 1099 1100
	struct inode		*inode = &ip->i_vnode;

	inode->i_ino = ip->i_ino;
C
Christoph Hellwig 已提交
1101
	inode->i_state = I_NEW;
1102 1103

	inode_sb_list_add(inode);
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Christoph Hellwig 已提交
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	/* make the inode look hashed for the writeback code */
	hlist_add_fake(&inode->i_hash);
1106 1107

	inode->i_mode	= ip->i_d.di_mode;
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Miklos Szeredi 已提交
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	set_nlink(inode, ip->i_d.di_nlink);
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	inode->i_uid	= ip->i_d.di_uid;
	inode->i_gid	= ip->i_d.di_gid;

	switch (inode->i_mode & S_IFMT) {
	case S_IFBLK:
	case S_IFCHR:
		inode->i_rdev =
			MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff,
			      sysv_minor(ip->i_df.if_u2.if_rdev));
		break;
	default:
		inode->i_rdev = 0;
		break;
	}

	inode->i_generation = ip->i_d.di_gen;
	i_size_write(inode, ip->i_d.di_size);
	inode->i_atime.tv_sec	= ip->i_d.di_atime.t_sec;
	inode->i_atime.tv_nsec	= ip->i_d.di_atime.t_nsec;
	inode->i_mtime.tv_sec	= ip->i_d.di_mtime.t_sec;
	inode->i_mtime.tv_nsec	= ip->i_d.di_mtime.t_nsec;
	inode->i_ctime.tv_sec	= ip->i_d.di_ctime.t_sec;
	inode->i_ctime.tv_nsec	= ip->i_d.di_ctime.t_nsec;
	xfs_diflags_to_iflags(inode, ip);

	switch (inode->i_mode & S_IFMT) {
	case S_IFREG:
		inode->i_op = &xfs_inode_operations;
		inode->i_fop = &xfs_file_operations;
		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:
		inode->i_op = &xfs_symlink_inode_operations;
		if (!(ip->i_df.if_flags & XFS_IFINLINE))
			inode->i_mapping->a_ops = &xfs_address_space_operations;
		break;
	default:
		inode->i_op = &xfs_inode_operations;
		init_special_inode(inode, inode->i_mode, inode->i_rdev);
		break;
	}

1158 1159 1160 1161 1162 1163
	/*
	 * 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);
1164
		cache_no_acl(inode);
1165
	}
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1167 1168 1169 1170 1171
	xfs_iflags_clear(ip, XFS_INEW);
	barrier();

	unlock_new_inode(inode);
}