xfs_iops.c 29.2 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_bit.h"
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#include "xfs_log.h"
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#include "xfs_inum.h"
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#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_rw.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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/*
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 * Bring the timestamps in the XFS inode uptodate.
 *
 * Used before writing the inode to disk.
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 */
void
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xfs_synchronize_times(
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	xfs_inode_t	*ip)
{
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	struct inode	*inode = VFS_I(ip);
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	ip->i_d.di_atime.t_sec = (__int32_t)inode->i_atime.tv_sec;
	ip->i_d.di_atime.t_nsec = (__int32_t)inode->i_atime.tv_nsec;
	ip->i_d.di_ctime.t_sec = (__int32_t)inode->i_ctime.tv_sec;
	ip->i_d.di_ctime.t_nsec = (__int32_t)inode->i_ctime.tv_nsec;
	ip->i_d.di_mtime.t_sec = (__int32_t)inode->i_mtime.tv_sec;
	ip->i_d.di_mtime.t_nsec = (__int32_t)inode->i_mtime.tv_nsec;
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}

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/*
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 * If the linux inode is valid, mark it dirty, else mark the dirty state
 * in the XFS inode to make sure we pick it up when reclaiming the inode.
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 */
void
xfs_mark_inode_dirty_sync(
	xfs_inode_t	*ip)
{
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	struct inode	*inode = VFS_I(ip);
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	if (!(inode->i_state & (I_WILL_FREE|I_FREEING)))
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		mark_inode_dirty_sync(inode);
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	else {
		barrier();
		ip->i_update_core = 1;
	}
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}

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void
xfs_mark_inode_dirty(
	xfs_inode_t	*ip)
{
	struct inode	*inode = VFS_I(ip);

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	if (!(inode->i_state & (I_WILL_FREE|I_FREEING)))
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		mark_inode_dirty(inode);
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	else {
		barrier();
		ip->i_update_core = 1;
	}

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}

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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).
 */
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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	struct xfs_inode *ip = XFS_I(inode);
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	size_t		length;
	void		*value;
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	unsigned char	*name;
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	int		error;

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	error = security_inode_init_security(inode, dir, qstr, (char **)&name,
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					     &value, &length);
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	if (error) {
		if (error == -EOPNOTSUPP)
			return 0;
		return -error;
	}

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	error = xfs_attr_set(ip, name, value, length, ATTR_SECURE);
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	kfree(name);
	kfree(value);
	return error;
}

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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,
	int		mode,
	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,
	int		mode,
	struct nameidata *nd)
{
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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,
	int		mode)
{
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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,
	struct nameidata *nd)
{
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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,
	struct nameidata *nd)
{
	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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	mode_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))
		return XFS_ERROR(EIO);

	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;
		}
	}

	xfs_trans_ijoin(tp, ip);

	/*
	 * 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;
		ip->i_update_core = 1;
	}
	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;
		ip->i_update_core = 1;
	}
	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;
		ip->i_update_core = 1;
	}

	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;
	struct xfs_trans	*tp;
	int			error;
	uint			lock_flags;
	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);

	lock_flags = XFS_ILOCK_EXCL;
	if (!(flags & XFS_ATTR_NOLOCK))
		lock_flags |= XFS_IOLOCK_EXCL;
	xfs_ilock(ip, lock_flags);

	/*
	 * Short circuit the truncate case for zero length files.
	 */
	if (iattr->ia_size == 0 &&
	    ip->i_size == 0 && ip->i_d.di_nextents == 0) {
784 785 786 787 788 789 790 791 792
		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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	}

	/*
	 * Make sure that the dquots are attached to the inode.
	 */
	error = xfs_qm_dqattach_locked(ip, 0);
	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.
	 */
	if (iattr->ia_size > ip->i_size) {
		/*
		 * 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.
		 */
		error = xfs_zero_eof(ip, iattr->ia_size, ip->i_size);
		if (error)
			goto out_unlock;
	}
	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	lock_flags &= ~XFS_ILOCK_EXCL;

	/*
	 * 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.
	 */
	if (ip->i_size != ip->i_d.di_size && iattr->ia_size > ip->i_d.di_size) {
		error = xfs_flush_pages(ip, ip->i_d.di_size, iattr->ia_size,
					XBF_ASYNC, FI_NONE);
		if (error)
			goto out_unlock;
	}

	/*
	 * Wait for all I/O to complete.
	 */
	xfs_ioend_wait(ip);

	error = -block_truncate_page(inode->i_mapping, iattr->ia_size,
				     xfs_get_blocks);
	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;

	truncate_setsize(inode, iattr->ia_size);

	commit_flags = XFS_TRANS_RELEASE_LOG_RES;
	lock_flags |= XFS_ILOCK_EXCL;

	xfs_ilock(ip, XFS_ILOCK_EXCL);

	xfs_trans_ijoin(tp, ip);

	/*
	 * Only change the c/mtime if we are changing the size or we are
	 * explicitly asked to change it.  This handles the semantic difference
	 * between truncate() and ftruncate() as implemented in the VFS.
	 *
	 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
	 * special case where we need to update the times despite not having
	 * these flags set.  For all other operations the VFS set these flags
	 * explicitly if it wants a timestamp update.
	 */
	if (iattr->ia_size != ip->i_size &&
	    (!(mask & (ATTR_CTIME | ATTR_MTIME)))) {
		iattr->ia_ctime = iattr->ia_mtime =
			current_fs_time(inode->i_sb);
		mask |= ATTR_CTIME | ATTR_MTIME;
	}

	if (iattr->ia_size > ip->i_size) {
		ip->i_d.di_size = iattr->ia_size;
		ip->i_size = iattr->ia_size;
	} else if (iattr->ia_size <= ip->i_size ||
		   (iattr->ia_size == 0 && ip->i_d.di_nextents)) {
890
		error = xfs_itruncate_data(&tp, ip, iattr->ia_size);
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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;
		ip->i_update_core = 1;
	}
	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;
		ip->i_update_core = 1;
	}

	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;
}

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STATIC int
938
xfs_vn_setattr(
L
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939
	struct dentry	*dentry,
940
	struct iattr	*iattr)
L
Linus Torvalds 已提交
941
{
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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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}

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Eric Sandeen 已提交
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#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);

1014
	/* We add one because in getbmap world count includes the header */
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Tao Ma 已提交
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	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)));
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Tao Ma 已提交
1019
	bm.bmv_iflags = BMV_IF_PREALLOC | BMV_IF_NO_HOLES;
E
Eric Sandeen 已提交
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	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;
}

1032
static const struct inode_operations xfs_inode_operations = {
1033
	.get_acl		= xfs_get_acl,
1034 1035
	.getattr		= xfs_vn_getattr,
	.setattr		= xfs_vn_setattr,
1036 1037 1038
	.setxattr		= generic_setxattr,
	.getxattr		= generic_getxattr,
	.removexattr		= generic_removexattr,
1039
	.listxattr		= xfs_vn_listxattr,
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Eric Sandeen 已提交
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	.fiemap			= xfs_vn_fiemap,
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Linus Torvalds 已提交
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};

1043
static const struct inode_operations xfs_dir_inode_operations = {
1044 1045 1046 1047 1048 1049
	.create			= xfs_vn_create,
	.lookup			= xfs_vn_lookup,
	.link			= xfs_vn_link,
	.unlink			= xfs_vn_unlink,
	.symlink		= xfs_vn_symlink,
	.mkdir			= xfs_vn_mkdir,
1050 1051 1052 1053 1054 1055 1056
	/*
	 * 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,
1057 1058
	.mknod			= xfs_vn_mknod,
	.rename			= xfs_vn_rename,
1059
	.get_acl		= xfs_get_acl,
1060 1061
	.getattr		= xfs_vn_getattr,
	.setattr		= xfs_vn_setattr,
1062 1063 1064
	.setxattr		= generic_setxattr,
	.getxattr		= generic_getxattr,
	.removexattr		= generic_removexattr,
1065
	.listxattr		= xfs_vn_listxattr,
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Linus Torvalds 已提交
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};

1068
static const struct inode_operations xfs_dir_ci_inode_operations = {
1069 1070 1071 1072 1073 1074
	.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,
1075 1076 1077 1078 1079 1080 1081
	/*
	 * 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,
1082 1083
	.mknod			= xfs_vn_mknod,
	.rename			= xfs_vn_rename,
1084
	.get_acl		= xfs_get_acl,
1085 1086
	.getattr		= xfs_vn_getattr,
	.setattr		= xfs_vn_setattr,
1087 1088 1089
	.setxattr		= generic_setxattr,
	.getxattr		= generic_getxattr,
	.removexattr		= generic_removexattr,
1090 1091 1092
	.listxattr		= xfs_vn_listxattr,
};

1093
static const struct inode_operations xfs_symlink_inode_operations = {
L
Linus Torvalds 已提交
1094
	.readlink		= generic_readlink,
1095 1096
	.follow_link		= xfs_vn_follow_link,
	.put_link		= xfs_vn_put_link,
1097
	.get_acl		= xfs_get_acl,
1098 1099
	.getattr		= xfs_vn_getattr,
	.setattr		= xfs_vn_setattr,
1100 1101 1102
	.setxattr		= generic_setxattr,
	.getxattr		= generic_getxattr,
	.removexattr		= generic_removexattr,
1103
	.listxattr		= xfs_vn_listxattr,
L
Linus Torvalds 已提交
1104
};
1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135

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.
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 *
 * We are always called with an uninitialised linux inode here.
 * We need to initialise the necessary fields and take a reference
 * on it.
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 */
void
xfs_setup_inode(
	struct xfs_inode	*ip)
{
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	struct inode		*inode = &ip->i_vnode;

	inode->i_ino = ip->i_ino;
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Christoph Hellwig 已提交
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	inode->i_state = I_NEW;
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	inode_sb_list_add(inode);
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	/* make the inode look hashed for the writeback code */
	hlist_add_fake(&inode->i_hash);
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	inode->i_mode	= ip->i_d.di_mode;
	inode->i_nlink	= ip->i_d.di_nlink;
	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;
	}

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	/*
	 * 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);
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		cache_no_acl(inode);
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	}
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	xfs_iflags_clear(ip, XFS_INEW);
	barrier();

	unlock_new_inode(inode);
}