Initial import

1 files changed, 1305 insertions, 0 deletions

diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
new file mode 100644
index 000000000..f4cd7204e
--- /dev/null
+++ b/fs/xfs/xfs_iops.c
@@ -0,0 +1,1305 @@
+/*
+ * Copyright (c) 2000-2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms 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.  See the
+ * GNU General Public License for more details.
+ *
+ * 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
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_shared.h"
+#include "xfs_format.h"
+#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
+#include "xfs_da_format.h"
+#include "xfs_inode.h"
+#include "xfs_bmap.h"
+#include "xfs_bmap_util.h"
+#include "xfs_acl.h"
+#include "xfs_quota.h"
+#include "xfs_error.h"
+#include "xfs_attr.h"
+#include "xfs_trans.h"
+#include "xfs_trace.h"
+#include "xfs_icache.h"
+#include "xfs_symlink.h"
+#include "xfs_da_btree.h"
+#include "xfs_dir2.h"
+#include "xfs_trans_space.h"
+#include "xfs_pnfs.h"
+
+#include <linux/capability.h>
+#include <linux/xattr.h>
+#include <linux/namei.h>
+#include <linux/posix_acl.h>
+#include <linux/security.h>
+#include <linux/fiemap.h>
+#include <linux/slab.h>
+
+/*
+ * Directories have different lock order w.r.t. mmap_sem compared to regular
+ * files. This is due to readdir potentially triggering page faults on a user
+ * buffer inside filldir(), and this happens with the ilock on the directory
+ * held. For regular files, the lock order is the other way around - the
+ * mmap_sem is taken during the page fault, and then we lock the ilock to do
+ * block mapping. Hence we need a different class for the directory ilock so
+ * that lockdep can tell them apart.
+ */
+static struct lock_class_key xfs_nondir_ilock_class;
+static struct lock_class_key xfs_dir_ilock_class;
+
+static int
+xfs_initxattrs(
+	struct inode		*inode,
+	const struct xattr	*xattr_array,
+	void			*fs_info)
+{
+	const struct xattr	*xattr;
+	struct xfs_inode	*ip = XFS_I(inode);
+	int			error = 0;
+
+	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
+		error = xfs_attr_set(ip, xattr->name, xattr->value,
+				      xattr->value_len, ATTR_SECURE);
+		if (error < 0)
+			break;
+	}
+	return error;
+}
+
+/*
+ * Hook in SELinux.  This is not quite correct yet, what we really need
+ * here (as we do for default ACLs) is a mechanism by which creation of
+ * these attrs can be journalled at inode creation time (along with the
+ * inode, of course, such that log replay can't cause these to be lost).
+ */
+
+STATIC int
+xfs_init_security(
+	struct inode	*inode,
+	struct inode	*dir,
+	const struct qstr *qstr)
+{
+	return security_inode_init_security(inode, dir, qstr,
+					     &xfs_initxattrs, NULL);
+}
+
+static void
+xfs_dentry_to_name(
+	struct xfs_name	*namep,
+	struct dentry	*dentry,
+	int		mode)
+{
+	namep->name = dentry->d_name.name;
+	namep->len = dentry->d_name.len;
+	namep->type = xfs_mode_to_ftype[(mode & S_IFMT) >> S_SHIFT];
+}
+
+STATIC void
+xfs_cleanup_inode(
+	struct inode	*dir,
+	struct inode	*inode,
+	struct dentry	*dentry)
+{
+	struct xfs_name	teardown;
+
+	/* Oh, the horror.
+	 * If we can't add the ACL or we fail in
+	 * xfs_init_security we must back out.
+	 * ENOSPC can hit here, among other things.
+	 */
+	xfs_dentry_to_name(&teardown, dentry, 0);
+
+	xfs_remove(XFS_I(dir), &teardown, XFS_I(inode));
+}
+
+STATIC int
+xfs_generic_create(
+	struct inode	*dir,
+	struct dentry	*dentry,
+	umode_t		mode,
+	dev_t		rdev,
+	bool		tmpfile)	/* unnamed file */
+{
+	struct inode	*inode;
+	struct xfs_inode *ip = NULL;
+	struct posix_acl *default_acl, *acl;
+	struct xfs_name	name;
+	int		error;
+
+	/*
+	 * Irix uses Missed'em'V split, but doesn't want to see
+	 * the upper 5 bits of (14bit) major.
+	 */
+	if (S_ISCHR(mode) || S_ISBLK(mode)) {
+		if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
+			return -EINVAL;
+		rdev = sysv_encode_dev(rdev);
+	} else {
+		rdev = 0;
+	}
+
+	error = posix_acl_create(dir, &mode, &default_acl, &acl);
+	if (error)
+		return error;
+
+	if (!tmpfile) {
+		xfs_dentry_to_name(&name, dentry, mode);
+		error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip);
+	} else {
+		error = xfs_create_tmpfile(XFS_I(dir), dentry, mode, &ip);
+	}
+	if (unlikely(error))
+		goto out_free_acl;
+
+	inode = VFS_I(ip);
+
+	error = xfs_init_security(inode, dir, &dentry->d_name);
+	if (unlikely(error))
+		goto out_cleanup_inode;
+
+#ifdef CONFIG_XFS_POSIX_ACL
+	if (default_acl) {
+		error = xfs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
+		if (error)
+			goto out_cleanup_inode;
+	}
+	if (acl) {
+		error = xfs_set_acl(inode, acl, ACL_TYPE_ACCESS);
+		if (error)
+			goto out_cleanup_inode;
+	}
+#endif
+
+	if (tmpfile)
+		d_tmpfile(dentry, inode);
+	else
+		d_instantiate(dentry, inode);
+
+	xfs_finish_inode_setup(ip);
+
+ out_free_acl:
+	if (default_acl)
+		posix_acl_release(default_acl);
+	if (acl)
+		posix_acl_release(acl);
+	return error;
+
+ out_cleanup_inode:
+	xfs_finish_inode_setup(ip);
+	if (!tmpfile)
+		xfs_cleanup_inode(dir, inode, dentry);
+	iput(inode);
+	goto out_free_acl;
+}
+
+STATIC int
+xfs_vn_mknod(
+	struct inode	*dir,
+	struct dentry	*dentry,
+	umode_t		mode,
+	dev_t		rdev)
+{
+	return xfs_generic_create(dir, dentry, mode, rdev, false);
+}
+
+STATIC int
+xfs_vn_create(
+	struct inode	*dir,
+	struct dentry	*dentry,
+	umode_t		mode,
+	bool		flags)
+{
+	return xfs_vn_mknod(dir, dentry, mode, 0);
+}
+
+STATIC int
+xfs_vn_mkdir(
+	struct inode	*dir,
+	struct dentry	*dentry,
+	umode_t		mode)
+{
+	return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0);
+}
+
+STATIC struct dentry *
+xfs_vn_lookup(
+	struct inode	*dir,
+	struct dentry	*dentry,
+	unsigned int flags)
+{
+	struct xfs_inode *cip;
+	struct xfs_name	name;
+	int		error;
+
+	if (dentry->d_name.len >= MAXNAMELEN)
+		return ERR_PTR(-ENAMETOOLONG);
+
+	xfs_dentry_to_name(&name, dentry, 0);
+	error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
+	if (unlikely(error)) {
+		if (unlikely(error != -ENOENT))
+			return ERR_PTR(error);
+		d_add(dentry, NULL);
+		return NULL;
+	}
+
+	return d_splice_alias(VFS_I(cip), dentry);
+}
+
+STATIC struct dentry *
+xfs_vn_ci_lookup(
+	struct inode	*dir,
+	struct dentry	*dentry,
+	unsigned int flags)
+{
+	struct xfs_inode *ip;
+	struct xfs_name	xname;
+	struct xfs_name ci_name;
+	struct qstr	dname;
+	int		error;
+
+	if (dentry->d_name.len >= MAXNAMELEN)
+		return ERR_PTR(-ENAMETOOLONG);
+
+	xfs_dentry_to_name(&xname, dentry, 0);
+	error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
+	if (unlikely(error)) {
+		if (unlikely(error != -ENOENT))
+			return ERR_PTR(error);
+		/*
+		 * call d_add(dentry, NULL) here when d_drop_negative_children
+		 * is called in xfs_vn_mknod (ie. allow negative dentries
+		 * with CI filesystems).
+		 */
+		return NULL;
+	}
+
+	/* if exact match, just splice and exit */
+	if (!ci_name.name)
+		return d_splice_alias(VFS_I(ip), dentry);
+
+	/* else case-insensitive match... */
+	dname.name = ci_name.name;
+	dname.len = ci_name.len;
+	dentry = d_add_ci(dentry, VFS_I(ip), &dname);
+	kmem_free(ci_name.name);
+	return dentry;
+}
+
+STATIC int
+xfs_vn_link(
+	struct dentry	*old_dentry,
+	struct inode	*dir,
+	struct dentry	*dentry)
+{
+	struct inode	*inode = d_inode(old_dentry);
+	struct xfs_name	name;
+	int		error;
+
+	xfs_dentry_to_name(&name, dentry, inode->i_mode);
+
+	error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
+	if (unlikely(error))
+		return error;
+
+	ihold(inode);
+	d_instantiate(dentry, inode);
+	return 0;
+}
+
+STATIC int
+xfs_vn_unlink(
+	struct inode	*dir,
+	struct dentry	*dentry)
+{
+	struct xfs_name	name;
+	int		error;
+
+	xfs_dentry_to_name(&name, dentry, 0);
+
+	error = xfs_remove(XFS_I(dir), &name, XFS_I(d_inode(dentry)));
+	if (error)
+		return error;
+
+	/*
+	 * With unlink, the VFS makes the dentry "negative": no inode,
+	 * but still hashed. This is incompatible with case-insensitive
+	 * mode, so invalidate (unhash) the dentry in CI-mode.
+	 */
+	if (xfs_sb_version_hasasciici(&XFS_M(dir->i_sb)->m_sb))
+		d_invalidate(dentry);
+	return 0;
+}
+
+STATIC int
+xfs_vn_symlink(
+	struct inode	*dir,
+	struct dentry	*dentry,
+	const char	*symname)
+{
+	struct inode	*inode;
+	struct xfs_inode *cip = NULL;
+	struct xfs_name	name;
+	int		error;
+	umode_t		mode;
+
+	mode = S_IFLNK |
+		(irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
+	xfs_dentry_to_name(&name, dentry, mode);
+
+	error = xfs_symlink(XFS_I(dir), &name, symname, mode, &cip);
+	if (unlikely(error))
+		goto out;
+
+	inode = VFS_I(cip);
+
+	error = xfs_init_security(inode, dir, &dentry->d_name);
+	if (unlikely(error))
+		goto out_cleanup_inode;
+
+	d_instantiate(dentry, inode);
+	xfs_finish_inode_setup(cip);
+	return 0;
+
+ out_cleanup_inode:
+	xfs_finish_inode_setup(cip);
+	xfs_cleanup_inode(dir, inode, dentry);
+	iput(inode);
+ out:
+	return error;
+}
+
+STATIC int
+xfs_vn_rename(
+	struct inode	*odir,
+	struct dentry	*odentry,
+	struct inode	*ndir,
+	struct dentry	*ndentry,
+	unsigned int	flags)
+{
+	struct inode	*new_inode = d_inode(ndentry);
+	int		omode = 0;
+	struct xfs_name	oname;
+	struct xfs_name	nname;
+
+	if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
+		return -EINVAL;
+
+	/* if we are exchanging files, we need to set i_mode of both files */
+	if (flags & RENAME_EXCHANGE)
+		omode = d_inode(ndentry)->i_mode;
+
+	xfs_dentry_to_name(&oname, odentry, omode);
+	xfs_dentry_to_name(&nname, ndentry, d_inode(odentry)->i_mode);
+
+	return xfs_rename(XFS_I(odir), &oname, XFS_I(d_inode(odentry)),
+			  XFS_I(ndir), &nname,
+			  new_inode ? XFS_I(new_inode) : NULL, flags);
+}
+
+/*
+ * careful here - this function can get called recursively, so
+ * we need to be very careful about how much stack we use.
+ * uio is kmalloced for this reason...
+ */
+STATIC void *
+xfs_vn_follow_link(
+	struct dentry		*dentry,
+	struct nameidata	*nd)
+{
+	char			*link;
+	int			error = -ENOMEM;
+
+	link = kmalloc(MAXPATHLEN+1, GFP_KERNEL);
+	if (!link)
+		goto out_err;
+
+	error = xfs_readlink(XFS_I(d_inode(dentry)), link);
+	if (unlikely(error))
+		goto out_kfree;
+
+	nd_set_link(nd, link);
+	return NULL;
+
+ out_kfree:
+	kfree(link);
+ out_err:
+	nd_set_link(nd, ERR_PTR(error));
+	return NULL;
+}
+
+STATIC int
+xfs_vn_getattr(
+	struct vfsmount		*mnt,
+	struct dentry		*dentry,
+	struct kstat		*stat)
+{
+	struct inode		*inode = d_inode(dentry);
+	struct xfs_inode	*ip = XFS_I(inode);
+	struct xfs_mount	*mp = ip->i_mount;
+
+	trace_xfs_getattr(ip);
+
+	if (XFS_FORCED_SHUTDOWN(mp))
+		return -EIO;
+
+	stat->size = XFS_ISIZE(ip);
+	stat->dev = inode->i_sb->s_dev;
+	stat->mode = ip->i_d.di_mode;
+	stat->nlink = ip->i_d.di_nlink;
+	stat->uid = inode->i_uid;
+	stat->gid = inode->i_gid;
+	stat->ino = ip->i_ino;
+	stat->atime = inode->i_atime;
+	stat->mtime = inode->i_mtime;
+	stat->ctime = inode->i_ctime;
+	stat->blocks =
+		XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);
+
+
+	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:
+		if (XFS_IS_REALTIME_INODE(ip)) {
+			/*
+			 * If the file blocks are being allocated from a
+			 * realtime volume, then return the inode's realtime
+			 * extent size or the realtime volume's extent size.
+			 */
+			stat->blksize =
+				xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog;
+		} else
+			stat->blksize = xfs_preferred_iosize(mp);
+		stat->rdev = 0;
+		break;
+	}
+
+	return 0;
+}
+
+static void
+xfs_setattr_mode(
+	struct xfs_inode	*ip,
+	struct iattr		*iattr)
+{
+	struct inode		*inode = VFS_I(ip);
+	umode_t			mode = iattr->ia_mode;
+
+	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
+
+	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;
+}
+
+void
+xfs_setattr_time(
+	struct xfs_inode	*ip,
+	struct iattr		*iattr)
+{
+	struct inode		*inode = VFS_I(ip);
+
+	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
+
+	if (iattr->ia_valid & ATTR_ATIME) {
+		inode->i_atime = iattr->ia_atime;
+		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 (iattr->ia_valid & 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 (iattr->ia_valid & 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;
+	}
+}
+
+int
+xfs_setattr_nonsize(
+	struct xfs_inode	*ip,
+	struct iattr		*iattr,
+	int			flags)
+{
+	xfs_mount_t		*mp = ip->i_mount;
+	struct inode		*inode = VFS_I(ip);
+	int			mask = iattr->ia_valid;
+	xfs_trans_t		*tp;
+	int			error;
+	kuid_t			uid = GLOBAL_ROOT_UID, iuid = GLOBAL_ROOT_UID;
+	kgid_t			gid = GLOBAL_ROOT_GID, igid = GLOBAL_ROOT_GID;
+	struct xfs_dquot	*udqp = NULL, *gdqp = NULL;
+	struct xfs_dquot	*olddquot1 = NULL, *olddquot2 = NULL;
+
+	trace_xfs_setattr(ip);
+
+	/* If acls are being inherited, we already have this checked */
+	if (!(flags & XFS_ATTR_NOACL)) {
+		if (mp->m_flags & XFS_MOUNT_RDONLY)
+			return -EROFS;
+
+		if (XFS_FORCED_SHUTDOWN(mp))
+			return -EIO;
+
+		error = inode_change_ok(inode, iattr);
+		if (error)
+			return 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 = inode->i_uid;
+		}
+		if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
+			gid = iattr->ia_gid;
+			qflags |= XFS_QMOPT_GQUOTA;
+		}  else {
+			gid = inode->i_gid;
+		}
+
+		/*
+		 * We take a reference when we initialize udqp and gdqp,
+		 * so it is important that we never blindly double trip on
+		 * the same variable. See xfs_create() for an example.
+		 */
+		ASSERT(udqp == NULL);
+		ASSERT(gdqp == NULL);
+		error = xfs_qm_vop_dqalloc(ip, xfs_kuid_to_uid(uid),
+					   xfs_kgid_to_gid(gid),
+					   xfs_get_projid(ip),
+					   qflags, &udqp, &gdqp, NULL);
+		if (error)
+			return error;
+	}
+
+	tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE);
+	error = xfs_trans_reserve(tp, &M_RES(mp)->tr_ichange, 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 = inode->i_uid;
+		igid = inode->i_gid;
+		gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
+		uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;
+
+		/*
+		 * Do a quota reservation only if uid/gid is actually
+		 * going to change.
+		 */
+		if (XFS_IS_QUOTA_RUNNING(mp) &&
+		    ((XFS_IS_UQUOTA_ON(mp) && !uid_eq(iuid, uid)) ||
+		     (XFS_IS_GQUOTA_ON(mp) && !gid_eq(igid, gid)))) {
+			ASSERT(tp);
+			error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
+						NULL, capable(CAP_FOWNER) ?
+						XFS_QMOPT_FORCE_RES : 0);
+			if (error)	/* out of quota */
+				goto out_trans_cancel;
+		}
+	}
+
+	xfs_trans_ijoin(tp, ip, 0);
+
+	/*
+	 * 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 (!uid_eq(iuid, uid)) {
+			if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) {
+				ASSERT(mask & ATTR_UID);
+				ASSERT(udqp);
+				olddquot1 = xfs_qm_vop_chown(tp, ip,
+							&ip->i_udquot, udqp);
+			}
+			ip->i_d.di_uid = xfs_kuid_to_uid(uid);
+			inode->i_uid = uid;
+		}
+		if (!gid_eq(igid, gid)) {
+			if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
+				ASSERT(xfs_sb_version_has_pquotino(&mp->m_sb) ||
+				       !XFS_IS_PQUOTA_ON(mp));
+				ASSERT(mask & ATTR_GID);
+				ASSERT(gdqp);
+				olddquot2 = xfs_qm_vop_chown(tp, ip,
+							&ip->i_gdquot, gdqp);
+			}
+			ip->i_d.di_gid = xfs_kgid_to_gid(gid);
+			inode->i_gid = gid;
+		}
+	}
+
+	if (mask & ATTR_MODE)
+		xfs_setattr_mode(ip, iattr);
+	if (mask & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
+		xfs_setattr_time(ip, iattr);
+
+	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+
+	XFS_STATS_INC(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 error;
+
+	/*
+	 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
+	 * 	     update.  We could avoid this with linked transactions
+	 * 	     and passing down the transaction pointer all the way
+	 *	     to attr_set.  No previous user of the generic
+	 * 	     Posix ACL code seems to care about this issue either.
+	 */
+	if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) {
+		error = posix_acl_chmod(inode, inode->i_mode);
+		if (error)
+			return error;
+	}
+
+	return 0;
+
+out_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)
+{
+	struct xfs_mount	*mp = ip->i_mount;
+	struct inode		*inode = VFS_I(ip);
+	xfs_off_t		oldsize, newsize;
+	struct xfs_trans	*tp;
+	int			error;
+	uint			lock_flags = 0;
+	uint			commit_flags = 0;
+	bool			did_zeroing = false;
+
+	trace_xfs_setattr(ip);
+
+	if (mp->m_flags & XFS_MOUNT_RDONLY)
+		return -EROFS;
+
+	if (XFS_FORCED_SHUTDOWN(mp))
+		return -EIO;
+
+	error = inode_change_ok(inode, iattr);
+	if (error)
+		return error;
+
+	ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
+	ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL));
+	ASSERT(S_ISREG(ip->i_d.di_mode));
+	ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
+		ATTR_MTIME_SET|ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0);
+
+	oldsize = inode->i_size;
+	newsize = iattr->ia_size;
+
+	/*
+	 * Short circuit the truncate case for zero length files.
+	 */
+	if (newsize == 0 && oldsize == 0 && ip->i_d.di_nextents == 0) {
+		if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
+			return 0;
+
+		/*
+		 * Use the regular setattr path to update the timestamps.
+		 */
+		iattr->ia_valid &= ~ATTR_SIZE;
+		return xfs_setattr_nonsize(ip, iattr, 0);
+	}
+
+	/*
+	 * Make sure that the dquots are attached to the inode.
+	 */
+	error = xfs_qm_dqattach(ip, 0);
+	if (error)
+		return error;
+
+	/*
+	 * File data changes must be complete before we start the transaction to
+	 * modify the inode.  This needs to be done before joining the inode to
+	 * the transaction because the inode cannot be unlocked once it is a
+	 * part of the transaction.
+	 *
+	 * Start with zeroing any data block beyond EOF that we may expose on
+	 * file extension.
+	 */
+	if (newsize > oldsize) {
+		error = xfs_zero_eof(ip, newsize, oldsize, &did_zeroing);
+		if (error)
+			return error;
+	}
+
+	/*
+	 * We are going to log the inode size change in this transaction so
+	 * any previous writes that are beyond the on disk EOF and the new
+	 * EOF that have not been written out need to be written here.  If we
+	 * do not write the data out, we expose ourselves to the null files
+	 * problem. Note that this includes any block zeroing we did above;
+	 * otherwise those blocks may not be zeroed after a crash.
+	 */
+	if (newsize > ip->i_d.di_size &&
+	    (oldsize != ip->i_d.di_size || did_zeroing)) {
+		error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
+						      ip->i_d.di_size, newsize);
+		if (error)
+			return error;
+	}
+
+	/* Now wait for all direct I/O to complete. */
+	inode_dio_wait(inode);
+
+	/*
+	 * We've already locked out new page faults, so now we can safely remove
+	 * pages from the page cache knowing they won't get refaulted until we
+	 * drop the XFS_MMAP_EXCL lock after the extent manipulations are
+	 * complete. The truncate_setsize() call also cleans partial EOF page
+	 * PTEs on extending truncates and hence ensures sub-page block size
+	 * filesystems are correctly handled, too.
+	 *
+	 * We have to do all the page cache truncate work outside the
+	 * transaction context as the "lock" order is page lock->log space
+	 * reservation as defined by extent allocation in the writeback path.
+	 * Hence a truncate can fail with ENOMEM from xfs_trans_reserve(), but
+	 * having already truncated the in-memory version of the file (i.e. made
+	 * user visible changes). There's not much we can do about this, except
+	 * to hope that the caller sees ENOMEM and retries the truncate
+	 * operation.
+	 */
+	error = block_truncate_page(inode->i_mapping, newsize, xfs_get_blocks);
+	if (error)
+		return error;
+	truncate_setsize(inode, newsize);
+
+	tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE);
+	error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0);
+	if (error)
+		goto out_trans_cancel;
+
+	commit_flags = XFS_TRANS_RELEASE_LOG_RES;
+	lock_flags |= XFS_ILOCK_EXCL;
+	xfs_ilock(ip, XFS_ILOCK_EXCL);
+	xfs_trans_ijoin(tp, ip, 0);
+
+	/*
+	 * Only change the c/mtime if we are changing the size or we are
+	 * explicitly asked to change it.  This handles the semantic difference
+	 * between truncate() and ftruncate() as implemented in the VFS.
+	 *
+	 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
+	 * special case where we need to update the times despite not having
+	 * these flags set.  For all other operations the VFS set these flags
+	 * explicitly if it wants a timestamp update.
+	 */
+	if (newsize != oldsize &&
+	    !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
+		iattr->ia_ctime = iattr->ia_mtime =
+			current_fs_time(inode->i_sb);
+		iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
+	}
+
+	/*
+	 * The first thing we do is set the size to new_size permanently on
+	 * disk.  This way we don't have to worry about anyone ever being able
+	 * to look at the data being freed even in the face of a crash.
+	 * What we're getting around here is the case where we free a block, it
+	 * is allocated to another file, it is written to, and then we crash.
+	 * If the new data gets written to the file but the log buffers
+	 * containing the free and reallocation don't, then we'd end up with
+	 * garbage in the blocks being freed.  As long as we make the new size
+	 * permanent before actually freeing any blocks it doesn't matter if
+	 * they get written to.
+	 */
+	ip->i_d.di_size = newsize;
+	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+
+	if (newsize <= oldsize) {
+		error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
+		if (error)
+			goto out_trans_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);
+
+		/* A truncate down always removes post-EOF blocks. */
+		xfs_inode_clear_eofblocks_tag(ip);
+	}
+
+	if (iattr->ia_valid & ATTR_MODE)
+		xfs_setattr_mode(ip, iattr);
+	if (iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
+		xfs_setattr_time(ip, iattr);
+
+	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+
+	XFS_STATS_INC(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;
+}
+
+STATIC int
+xfs_vn_setattr(
+	struct dentry		*dentry,
+	struct iattr		*iattr)
+{
+	struct xfs_inode	*ip = XFS_I(d_inode(dentry));
+	int			error;
+
+	if (iattr->ia_valid & ATTR_SIZE) {
+		uint		iolock = XFS_IOLOCK_EXCL;
+
+		xfs_ilock(ip, iolock);
+		error = xfs_break_layouts(d_inode(dentry), &iolock, true);
+		if (!error) {
+			xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
+			iolock |= XFS_MMAPLOCK_EXCL;
+
+			error = xfs_setattr_size(ip, iattr);
+		}
+		xfs_iunlock(ip, iolock);
+	} else {
+		error = xfs_setattr_nonsize(ip, iattr, 0);
+	}
+
+	return error;
+}
+
+STATIC int
+xfs_vn_update_time(
+	struct inode		*inode,
+	struct timespec		*now,
+	int			flags)
+{
+	struct xfs_inode	*ip = XFS_I(inode);
+	struct xfs_mount	*mp = ip->i_mount;
+	struct xfs_trans	*tp;
+	int			error;
+
+	trace_xfs_update_time(ip);
+
+	tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS);
+	error = xfs_trans_reserve(tp, &M_RES(mp)->tr_fsyncts, 0, 0);
+	if (error) {
+		xfs_trans_cancel(tp, 0);
+		return error;
+	}
+
+	xfs_ilock(ip, XFS_ILOCK_EXCL);
+	if (flags & S_CTIME) {
+		inode->i_ctime = *now;
+		ip->i_d.di_ctime.t_sec = (__int32_t)now->tv_sec;
+		ip->i_d.di_ctime.t_nsec = (__int32_t)now->tv_nsec;
+	}
+	if (flags & S_MTIME) {
+		inode->i_mtime = *now;
+		ip->i_d.di_mtime.t_sec = (__int32_t)now->tv_sec;
+		ip->i_d.di_mtime.t_nsec = (__int32_t)now->tv_nsec;
+	}
+	if (flags & S_ATIME) {
+		inode->i_atime = *now;
+		ip->i_d.di_atime.t_sec = (__int32_t)now->tv_sec;
+		ip->i_d.di_atime.t_nsec = (__int32_t)now->tv_nsec;
+	}
+	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
+	xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
+	return xfs_trans_commit(tp, 0);
+}
+
+#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 |
+				 FIEMAP_EXTENT_UNKNOWN);
+		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 = BTOBBT(start);
+	/* Special case for whole file */
+	if (length == FIEMAP_MAX_OFFSET)
+		bm.bmv_length = -1LL;
+	else
+		bm.bmv_length = BTOBB(start + length) - bm.bmv_offset;
+
+	/* We add one because in getbmap world count includes the header */
+	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)));
+	bm.bmv_iflags = BMV_IF_PREALLOC | BMV_IF_NO_HOLES;
+	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;
+}
+
+STATIC int
+xfs_vn_tmpfile(
+	struct inode	*dir,
+	struct dentry	*dentry,
+	umode_t		mode)
+{
+	return xfs_generic_create(dir, dentry, mode, 0, true);
+}
+
+static const struct inode_operations xfs_inode_operations = {
+	.get_acl		= xfs_get_acl,
+	.set_acl		= xfs_set_acl,
+	.getattr		= xfs_vn_getattr,
+	.setattr		= xfs_vn_setattr,
+	.setxattr		= generic_setxattr,
+	.getxattr		= generic_getxattr,
+	.removexattr		= generic_removexattr,
+	.listxattr		= xfs_vn_listxattr,
+	.fiemap			= xfs_vn_fiemap,
+	.update_time		= xfs_vn_update_time,
+};
+
+static const struct inode_operations xfs_dir_inode_operations = {
+	.create			= xfs_vn_create,
+	.lookup			= xfs_vn_lookup,
+	.link			= xfs_vn_link,
+	.unlink			= xfs_vn_unlink,
+	.symlink		= xfs_vn_symlink,
+	.mkdir			= xfs_vn_mkdir,
+	/*
+	 * Yes, XFS uses the same method for rmdir and unlink.
+	 *
+	 * There are some subtile differences deeper in the code,
+	 * but we use S_ISDIR to check for those.
+	 */
+	.rmdir			= xfs_vn_unlink,
+	.mknod			= xfs_vn_mknod,
+	.rename2		= xfs_vn_rename,
+	.get_acl		= xfs_get_acl,
+	.set_acl		= xfs_set_acl,
+	.getattr		= xfs_vn_getattr,
+	.setattr		= xfs_vn_setattr,
+	.setxattr		= generic_setxattr,
+	.getxattr		= generic_getxattr,
+	.removexattr		= generic_removexattr,
+	.listxattr		= xfs_vn_listxattr,
+	.update_time		= xfs_vn_update_time,
+	.tmpfile		= xfs_vn_tmpfile,
+};
+
+static const struct inode_operations xfs_dir_ci_inode_operations = {
+	.create			= xfs_vn_create,
+	.lookup			= xfs_vn_ci_lookup,
+	.link			= xfs_vn_link,
+	.unlink			= xfs_vn_unlink,
+	.symlink		= xfs_vn_symlink,
+	.mkdir			= xfs_vn_mkdir,
+	/*
+	 * Yes, XFS uses the same method for rmdir and unlink.
+	 *
+	 * There are some subtile differences deeper in the code,
+	 * but we use S_ISDIR to check for those.
+	 */
+	.rmdir			= xfs_vn_unlink,
+	.mknod			= xfs_vn_mknod,
+	.rename2		= xfs_vn_rename,
+	.get_acl		= xfs_get_acl,
+	.set_acl		= xfs_set_acl,
+	.getattr		= xfs_vn_getattr,
+	.setattr		= xfs_vn_setattr,
+	.setxattr		= generic_setxattr,
+	.getxattr		= generic_getxattr,
+	.removexattr		= generic_removexattr,
+	.listxattr		= xfs_vn_listxattr,
+	.update_time		= xfs_vn_update_time,
+	.tmpfile		= xfs_vn_tmpfile,
+};
+
+static const struct inode_operations xfs_symlink_inode_operations = {
+	.readlink		= generic_readlink,
+	.follow_link		= xfs_vn_follow_link,
+	.put_link		= kfree_put_link,
+	.getattr		= xfs_vn_getattr,
+	.setattr		= xfs_vn_setattr,
+	.setxattr		= generic_setxattr,
+	.getxattr		= generic_getxattr,
+	.removexattr		= generic_removexattr,
+	.listxattr		= xfs_vn_listxattr,
+	.update_time		= xfs_vn_update_time,
+};
+
+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 and set up the operation vectors.
+ *
+ * When reading existing inodes from disk this is called directly from xfs_iget,
+ * when creating a new inode it is called from xfs_ialloc after setting up the
+ * inode. These callers have different criteria for clearing XFS_INEW, so leave
+ * it up to the caller to deal with unlocking the inode appropriately.
+ */
+void
+xfs_setup_inode(
+	struct xfs_inode	*ip)
+{
+	struct inode		*inode = &ip->i_vnode;
+	gfp_t			gfp_mask;
+
+	inode->i_ino = ip->i_ino;
+	inode->i_state = I_NEW;
+
+	inode_sb_list_add(inode);
+	/* make the inode look hashed for the writeback code */
+	hlist_add_fake(&inode->i_hash);
+
+	inode->i_mode	= ip->i_d.di_mode;
+	set_nlink(inode, ip->i_d.di_nlink);
+	inode->i_uid    = xfs_uid_to_kuid(ip->i_d.di_uid);
+	inode->i_gid    = xfs_gid_to_kgid(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);
+
+	ip->d_ops = ip->i_mount->m_nondir_inode_ops;
+	lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class);
+	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:
+		lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class);
+		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;
+		ip->d_ops = ip->i_mount->m_dir_inode_ops;
+		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;
+	}
+
+	/*
+	 * Ensure all page cache allocations are done from GFP_NOFS context to
+	 * prevent direct reclaim recursion back into the filesystem and blowing
+	 * stacks or deadlocking.
+	 */
+	gfp_mask = mapping_gfp_mask(inode->i_mapping);
+	mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
+
+	/*
+	 * If there is no attribute fork no ACL can exist on this inode,
+	 * and it can't have any file capabilities attached to it either.
+	 */
+	if (!XFS_IFORK_Q(ip)) {
+		inode_has_no_xattr(inode);
+		cache_no_acl(inode);
+	}
+}