Merge branch 'master' of git://git.kernel.org/pub/scm/fs/xfs/xfs

11 files changed, 294 insertions, 325 deletions

diff --git a/fs/xfs/Kconfig b/fs/xfs/Kconfig
index 3f53dd101f99..29228f5899cd 100644
--- a/fs/xfs/Kconfig
+++ b/fs/xfs/Kconfig
@@ -1,6 +1,7 @@
 config XFS_FS
 	tristate "XFS filesystem support"
 	depends on BLOCK
+	select EXPORTFS
 	help
 	  XFS is a high performance journaling filesystem which originated
 	  on the SGI IRIX platform.  It is completely multi-threaded, can
diff --git a/fs/xfs/linux-2.6/xfs_ioctl.c b/fs/xfs/linux-2.6/xfs_ioctl.c
index e5be1e0be802..4bd112313f33 100644
--- a/fs/xfs/linux-2.6/xfs_ioctl.c
+++ b/fs/xfs/linux-2.6/xfs_ioctl.c
@@ -50,12 +50,14 @@
 #include "xfs_vnodeops.h"
 #include "xfs_quota.h"
 #include "xfs_inode_item.h"
+#include "xfs_export.h"
 
 #include <linux/capability.h>
 #include <linux/dcache.h>
 #include <linux/mount.h>
 #include <linux/namei.h>
 #include <linux/pagemap.h>
+#include <linux/exportfs.h>
 
 /*
  * xfs_find_handle maps from userspace xfs_fsop_handlereq structure to
@@ -164,97 +166,69 @@ xfs_find_handle(
 	return 0;
 }
 
-
 /*
- * Convert userspace handle data into inode.
- *
- * We use the fact that all the fsop_handlereq ioctl calls have a data
- * structure argument whose first component is always a xfs_fsop_handlereq_t,
- * so we can pass that sub structure into this handy, shared routine.
- *
- * If no error, caller must always iput the returned inode.
+ * No need to do permission checks on the various pathname components
+ * as the handle operations are privileged.
  */
 STATIC int
-xfs_vget_fsop_handlereq(
-	xfs_mount_t		*mp,
-	struct inode		*parinode,	/* parent inode pointer    */
-	xfs_fsop_handlereq_t	*hreq,
-	struct inode		**inode)
+xfs_handle_acceptable(
+	void			*context,
+	struct dentry		*dentry)
+{
+	return 1;
+}
+
+/*
+ * Convert userspace handle data into a dentry.
+ */
+struct dentry *
+xfs_handle_to_dentry(
+	struct file		*parfilp,
+	void __user		*uhandle,
+	u32			hlen)
 {
-	void			__user *hanp;
-	size_t			hlen;
-	xfs_fid_t		*xfid;
-	xfs_handle_t		*handlep;
 	xfs_handle_t		handle;
-	xfs_inode_t		*ip;
-	xfs_ino_t		ino;
-	__u32			igen;
-	int			error;
+	struct xfs_fid64	fid;
 
 	/*
 	 * Only allow handle opens under a directory.
 	 */
-	if (!S_ISDIR(parinode->i_mode))
-		return XFS_ERROR(ENOTDIR);
-
-	hanp = hreq->ihandle;
-	hlen = hreq->ihandlen;
-	handlep = &handle;
-
-	if (hlen < sizeof(handlep->ha_fsid) || hlen > sizeof(*handlep))
-		return XFS_ERROR(EINVAL);
-	if (copy_from_user(handlep, hanp, hlen))
-		return XFS_ERROR(EFAULT);
-	if (hlen < sizeof(*handlep))
-		memset(((char *)handlep) + hlen, 0, sizeof(*handlep) - hlen);
-	if (hlen > sizeof(handlep->ha_fsid)) {
-		if (handlep->ha_fid.fid_len !=
-		    (hlen - sizeof(handlep->ha_fsid) -
-		            sizeof(handlep->ha_fid.fid_len)) ||
-		    handlep->ha_fid.fid_pad)
-			return XFS_ERROR(EINVAL);
-	}
-
-	/*
-	 * Crack the handle, obtain the inode # & generation #
-	 */
-	xfid = (struct xfs_fid *)&handlep->ha_fid;
-	if (xfid->fid_len == sizeof(*xfid) - sizeof(xfid->fid_len)) {
-		ino  = xfid->fid_ino;
-		igen = xfid->fid_gen;
-	} else {
-		return XFS_ERROR(EINVAL);
-	}
-
-	/*
-	 * Get the XFS inode, building a Linux inode to go with it.
-	 */
-	error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_SHARED, &ip, 0);
-	if (error)
-		return error;
-	if (ip == NULL)
-		return XFS_ERROR(EIO);
-	if (ip->i_d.di_gen != igen) {
-		xfs_iput_new(ip, XFS_ILOCK_SHARED);
-		return XFS_ERROR(ENOENT);
-	}
-
-	xfs_iunlock(ip, XFS_ILOCK_SHARED);
+	if (!S_ISDIR(parfilp->f_path.dentry->d_inode->i_mode))
+		return ERR_PTR(-ENOTDIR);
+
+	if (hlen != sizeof(xfs_handle_t))
+		return ERR_PTR(-EINVAL);
+	if (copy_from_user(&handle, uhandle, hlen))
+		return ERR_PTR(-EFAULT);
+	if (handle.ha_fid.fid_len !=
+	    sizeof(handle.ha_fid) - sizeof(handle.ha_fid.fid_len))
+		return ERR_PTR(-EINVAL);
+
+	memset(&fid, 0, sizeof(struct fid));
+	fid.ino = handle.ha_fid.fid_ino;
+	fid.gen = handle.ha_fid.fid_gen;
+
+	return exportfs_decode_fh(parfilp->f_path.mnt, (struct fid *)&fid, 3,
+			FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG,
+			xfs_handle_acceptable, NULL);
+}
 
-	*inode = VFS_I(ip);
-	return 0;
+STATIC struct dentry *
+xfs_handlereq_to_dentry(
+	struct file		*parfilp,
+	xfs_fsop_handlereq_t	*hreq)
+{
+	return xfs_handle_to_dentry(parfilp, hreq->ihandle, hreq->ihandlen);
 }
 
 int
 xfs_open_by_handle(
-	xfs_mount_t		*mp,
-	xfs_fsop_handlereq_t	*hreq,
 	struct file		*parfilp,
-	struct inode		*parinode)
+	xfs_fsop_handlereq_t	*hreq)
 {
 	const struct cred	*cred = current_cred();
 	int			error;
-	int			new_fd;
+	int			fd;
 	int			permflag;
 	struct file		*filp;
 	struct inode		*inode;
@@ -263,19 +237,21 @@ xfs_open_by_handle(
 	if (!capable(CAP_SYS_ADMIN))
 		return -XFS_ERROR(EPERM);
 
-	error = xfs_vget_fsop_handlereq(mp, parinode, hreq, &inode);
-	if (error)
-		return -error;
+	dentry = xfs_handlereq_to_dentry(parfilp, hreq);
+	if (IS_ERR(dentry))
+		return PTR_ERR(dentry);
+	inode = dentry->d_inode;
 
 	/* Restrict xfs_open_by_handle to directories & regular files. */
 	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) {
-		iput(inode);
-		return -XFS_ERROR(EINVAL);
+		error = -XFS_ERROR(EPERM);
+		goto out_dput;
 	}
 
 #if BITS_PER_LONG != 32
 	hreq->oflags |= O_LARGEFILE;
 #endif
+
 	/* Put open permission in namei format. */
 	permflag = hreq->oflags;
 	if ((permflag+1) & O_ACCMODE)
@@ -285,50 +261,45 @@ xfs_open_by_handle(
 
 	if ((!(permflag & O_APPEND) || (permflag & O_TRUNC)) &&
 	    (permflag & FMODE_WRITE) && IS_APPEND(inode)) {
-		iput(inode);
-		return -XFS_ERROR(EPERM);
+		error = -XFS_ERROR(EPERM);
+		goto out_dput;
 	}
 
 	if ((permflag & FMODE_WRITE) && IS_IMMUTABLE(inode)) {
-		iput(inode);
-		return -XFS_ERROR(EACCES);
+		error = -XFS_ERROR(EACCES);
+		goto out_dput;
 	}
 
 	/* Can't write directories. */
-	if ( S_ISDIR(inode->i_mode) && (permflag & FMODE_WRITE)) {
-		iput(inode);
-		return -XFS_ERROR(EISDIR);
+	if (S_ISDIR(inode->i_mode) && (permflag & FMODE_WRITE)) {
+		error = -XFS_ERROR(EISDIR);
+		goto out_dput;
 	}
 
-	if ((new_fd = get_unused_fd()) < 0) {
-		iput(inode);
-		return new_fd;
+	fd = get_unused_fd();
+	if (fd < 0) {
+		error = fd;
+		goto out_dput;
 	}
 
-	dentry = d_obtain_alias(inode);
-	if (IS_ERR(dentry)) {
-		put_unused_fd(new_fd);
-		return PTR_ERR(dentry);
-	}
-
-	/* Ensure umount returns EBUSY on umounts while this file is open. */
-	mntget(parfilp->f_path.mnt);
-
-	/* Create file pointer. */
-	filp = dentry_open(dentry, parfilp->f_path.mnt, hreq->oflags, cred);
+	filp = dentry_open(dentry, mntget(parfilp->f_path.mnt),
+			   hreq->oflags, cred);
 	if (IS_ERR(filp)) {
-		put_unused_fd(new_fd);
-		return -XFS_ERROR(-PTR_ERR(filp));
+		put_unused_fd(fd);
+		return PTR_ERR(filp);
 	}
 
 	if (inode->i_mode & S_IFREG) {
-		/* invisible operation should not change atime */
 		filp->f_flags |= O_NOATIME;
 		filp->f_mode |= FMODE_NOCMTIME;
 	}
 
-	fd_install(new_fd, filp);
-	return new_fd;
+	fd_install(fd, filp);
+	return fd;
+
+ out_dput:
+	dput(dentry);
+	return error;
 }
 
 /*
@@ -359,11 +330,10 @@ do_readlink(
 
 int
 xfs_readlink_by_handle(
-	xfs_mount_t		*mp,
-	xfs_fsop_handlereq_t	*hreq,
-	struct inode		*parinode)
+	struct file		*parfilp,
+	xfs_fsop_handlereq_t	*hreq)
 {
-	struct inode		*inode;
+	struct dentry		*dentry;
 	__u32			olen;
 	void			*link;
 	int			error;
@@ -371,26 +341,28 @@ xfs_readlink_by_handle(
 	if (!capable(CAP_SYS_ADMIN))
 		return -XFS_ERROR(EPERM);
 
-	error = xfs_vget_fsop_handlereq(mp, parinode, hreq, &inode);
-	if (error)
-		return -error;
+	dentry = xfs_handlereq_to_dentry(parfilp, hreq);
+	if (IS_ERR(dentry))
+		return PTR_ERR(dentry);
 
 	/* Restrict this handle operation to symlinks only. */
-	if (!S_ISLNK(inode->i_mode)) {
+	if (!S_ISLNK(dentry->d_inode->i_mode)) {
 		error = -XFS_ERROR(EINVAL);
-		goto out_iput;
+		goto out_dput;
 	}
 
 	if (copy_from_user(&olen, hreq->ohandlen, sizeof(__u32))) {
 		error = -XFS_ERROR(EFAULT);
-		goto out_iput;
+		goto out_dput;
 	}
 
 	link = kmalloc(MAXPATHLEN+1, GFP_KERNEL);
-	if (!link)
-		goto out_iput;
+	if (!link) {
+		error = -XFS_ERROR(ENOMEM);
+		goto out_dput;
+	}
 
-	error = -xfs_readlink(XFS_I(inode), link);
+	error = -xfs_readlink(XFS_I(dentry->d_inode), link);
 	if (error)
 		goto out_kfree;
 	error = do_readlink(hreq->ohandle, olen, link);
@@ -399,32 +371,31 @@ xfs_readlink_by_handle(
 
  out_kfree:
 	kfree(link);
- out_iput:
-	iput(inode);
+ out_dput:
+	dput(dentry);
 	return error;
 }
 
 STATIC int
 xfs_fssetdm_by_handle(
-	xfs_mount_t		*mp,
-	void			__user *arg,
-	struct inode		*parinode)
+	struct file		*parfilp,
+	void			__user *arg)
 {
 	int			error;
 	struct fsdmidata	fsd;
 	xfs_fsop_setdm_handlereq_t dmhreq;
-	struct inode		*inode;
+	struct dentry		*dentry;
 
 	if (!capable(CAP_MKNOD))
 		return -XFS_ERROR(EPERM);
 	if (copy_from_user(&dmhreq, arg, sizeof(xfs_fsop_setdm_handlereq_t)))
 		return -XFS_ERROR(EFAULT);
 
-	error = xfs_vget_fsop_handlereq(mp, parinode, &dmhreq.hreq, &inode);
-	if (error)
-		return -error;
+	dentry = xfs_handlereq_to_dentry(parfilp, &dmhreq.hreq);
+	if (IS_ERR(dentry))
+		return PTR_ERR(dentry);
 
-	if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) {
+	if (IS_IMMUTABLE(dentry->d_inode) || IS_APPEND(dentry->d_inode)) {
 		error = -XFS_ERROR(EPERM);
 		goto out;
 	}
@@ -434,24 +405,23 @@ xfs_fssetdm_by_handle(
 		goto out;
 	}
 
-	error = -xfs_set_dmattrs(XFS_I(inode), fsd.fsd_dmevmask,
+	error = -xfs_set_dmattrs(XFS_I(dentry->d_inode), fsd.fsd_dmevmask,
 				 fsd.fsd_dmstate);
 
  out:
-	iput(inode);
+	dput(dentry);
 	return error;
 }
 
 STATIC int
 xfs_attrlist_by_handle(
-	xfs_mount_t		*mp,
-	void			__user *arg,
-	struct inode		*parinode)
+	struct file		*parfilp,
+	void			__user *arg)
 {
-	int			error;
+	int			error = -ENOMEM;
 	attrlist_cursor_kern_t	*cursor;
 	xfs_fsop_attrlist_handlereq_t al_hreq;
-	struct inode		*inode;
+	struct dentry		*dentry;
 	char			*kbuf;
 
 	if (!capable(CAP_SYS_ADMIN))
@@ -467,16 +437,16 @@ xfs_attrlist_by_handle(
 	if (al_hreq.flags & ~(ATTR_ROOT | ATTR_SECURE))
 		return -XFS_ERROR(EINVAL);
 
-	error = xfs_vget_fsop_handlereq(mp, parinode, &al_hreq.hreq, &inode);
-	if (error)
-		goto out;
+	dentry = xfs_handlereq_to_dentry(parfilp, &al_hreq.hreq);
+	if (IS_ERR(dentry))
+		return PTR_ERR(dentry);
 
 	kbuf = kmalloc(al_hreq.buflen, GFP_KERNEL);
 	if (!kbuf)
-		goto out_vn_rele;
+		goto out_dput;
 
 	cursor = (attrlist_cursor_kern_t *)&al_hreq.pos;
-	error = xfs_attr_list(XFS_I(inode), kbuf, al_hreq.buflen,
+	error = -xfs_attr_list(XFS_I(dentry->d_inode), kbuf, al_hreq.buflen,
 					al_hreq.flags, cursor);
 	if (error)
 		goto out_kfree;
@@ -486,10 +456,9 @@ xfs_attrlist_by_handle(
 
  out_kfree:
 	kfree(kbuf);
- out_vn_rele:
-	iput(inode);
- out:
-	return -error;
+ out_dput:
+	dput(dentry);
+	return error;
 }
 
 int
@@ -564,15 +533,13 @@ xfs_attrmulti_attr_remove(
 
 STATIC int
 xfs_attrmulti_by_handle(
-	xfs_mount_t		*mp,
-	void			__user *arg,
 	struct file		*parfilp,
-	struct inode		*parinode)
+	void			__user *arg)
 {
 	int			error;
 	xfs_attr_multiop_t	*ops;
 	xfs_fsop_attrmulti_handlereq_t am_hreq;
-	struct inode		*inode;
+	struct dentry		*dentry;
 	unsigned int		i, size;
 	char			*attr_name;
 
@@ -581,19 +548,19 @@ xfs_attrmulti_by_handle(
 	if (copy_from_user(&am_hreq, arg, sizeof(xfs_fsop_attrmulti_handlereq_t)))
 		return -XFS_ERROR(EFAULT);
 
-	error = xfs_vget_fsop_handlereq(mp, parinode, &am_hreq.hreq, &inode);
-	if (error)
-		goto out;
+	dentry = xfs_handlereq_to_dentry(parfilp, &am_hreq.hreq);
+	if (IS_ERR(dentry))
+		return PTR_ERR(dentry);
 
 	error = E2BIG;
 	size = am_hreq.opcount * sizeof(xfs_attr_multiop_t);
 	if (!size || size > 16 * PAGE_SIZE)
-		goto out_vn_rele;
+		goto out_dput;
 
 	error = ENOMEM;
 	ops = kmalloc(size, GFP_KERNEL);
 	if (!ops)
-		goto out_vn_rele;
+		goto out_dput;
 
 	error = EFAULT;
 	if (copy_from_user(ops, am_hreq.ops, size))
@@ -615,25 +582,28 @@ xfs_attrmulti_by_handle(
 
 		switch (ops[i].am_opcode) {
 		case ATTR_OP_GET:
-			ops[i].am_error = xfs_attrmulti_attr_get(inode,
-					attr_name, ops[i].am_attrvalue,
-					&ops[i].am_length, ops[i].am_flags);
+			ops[i].am_error = xfs_attrmulti_attr_get(
+					dentry->d_inode, attr_name,
+					ops[i].am_attrvalue, &ops[i].am_length,
+					ops[i].am_flags);
 			break;
 		case ATTR_OP_SET:
 			ops[i].am_error = mnt_want_write(parfilp->f_path.mnt);
 			if (ops[i].am_error)
 				break;
-			ops[i].am_error = xfs_attrmulti_attr_set(inode,
-					attr_name, ops[i].am_attrvalue,
-					ops[i].am_length, ops[i].am_flags);
+			ops[i].am_error = xfs_attrmulti_attr_set(
+					dentry->d_inode, attr_name,
+					ops[i].am_attrvalue, ops[i].am_length,
+					ops[i].am_flags);
 			mnt_drop_write(parfilp->f_path.mnt);
 			break;
 		case ATTR_OP_REMOVE:
 			ops[i].am_error = mnt_want_write(parfilp->f_path.mnt);
 			if (ops[i].am_error)
 				break;
-			ops[i].am_error = xfs_attrmulti_attr_remove(inode,
-					attr_name, ops[i].am_flags);
+			ops[i].am_error = xfs_attrmulti_attr_remove(
+					dentry->d_inode, attr_name,
+					ops[i].am_flags);
 			mnt_drop_write(parfilp->f_path.mnt);
 			break;
 		default:
@@ -647,9 +617,8 @@ xfs_attrmulti_by_handle(
 	kfree(attr_name);
  out_kfree_ops:
 	kfree(ops);
- out_vn_rele:
-	iput(inode);
- out:
+ out_dput:
+	dput(dentry);
 	return -error;
 }
 
@@ -1440,23 +1409,23 @@ xfs_file_ioctl(
 
 		if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
 			return -XFS_ERROR(EFAULT);
-		return xfs_open_by_handle(mp, &hreq, filp, inode);
+		return xfs_open_by_handle(filp, &hreq);
 	}
 	case XFS_IOC_FSSETDM_BY_HANDLE:
-		return xfs_fssetdm_by_handle(mp, arg, inode);
+		return xfs_fssetdm_by_handle(filp, arg);
 
 	case XFS_IOC_READLINK_BY_HANDLE: {
 		xfs_fsop_handlereq_t	hreq;
 
 		if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
 			return -XFS_ERROR(EFAULT);
-		return xfs_readlink_by_handle(mp, &hreq, inode);
+		return xfs_readlink_by_handle(filp, &hreq);
 	}
 	case XFS_IOC_ATTRLIST_BY_HANDLE:
-		return xfs_attrlist_by_handle(mp, arg, inode);
+		return xfs_attrlist_by_handle(filp, arg);
 
 	case XFS_IOC_ATTRMULTI_BY_HANDLE:
-		return xfs_attrmulti_by_handle(mp, arg, filp, inode);
+		return xfs_attrmulti_by_handle(filp, arg);
 
 	case XFS_IOC_SWAPEXT: {
 		struct xfs_swapext	sxp;
diff --git a/fs/xfs/linux-2.6/xfs_ioctl.h b/fs/xfs/linux-2.6/xfs_ioctl.h
index 8c16bf2d7e03..7bd7c6afc1eb 100644
--- a/fs/xfs/linux-2.6/xfs_ioctl.h
+++ b/fs/xfs/linux-2.6/xfs_ioctl.h
@@ -34,16 +34,13 @@ xfs_find_handle(
 
 extern int
 xfs_open_by_handle(
-	xfs_mount_t		*mp,
-	xfs_fsop_handlereq_t	*hreq,
 	struct file		*parfilp,
-	struct inode		*parinode);
+	xfs_fsop_handlereq_t	*hreq);
 
 extern int
 xfs_readlink_by_handle(
-	xfs_mount_t		*mp,
-	xfs_fsop_handlereq_t	*hreq,
-	struct inode		*parinode);
+	struct file		*parfilp,
+	xfs_fsop_handlereq_t	*hreq);
 
 extern int
 xfs_attrmulti_attr_get(
@@ -67,6 +64,12 @@ xfs_attrmulti_attr_remove(
 	char			*name,
 	__uint32_t		flags);
 
+extern struct dentry *
+xfs_handle_to_dentry(
+	struct file		*parfilp,
+	void __user		*uhandle,
+	u32			hlen);
+
 extern long
 xfs_file_ioctl(
 	struct file		*filp,
diff --git a/fs/xfs/linux-2.6/xfs_ioctl32.c b/fs/xfs/linux-2.6/xfs_ioctl32.c
index 50903ad3182e..c70c4e3db790 100644
--- a/fs/xfs/linux-2.6/xfs_ioctl32.c
+++ b/fs/xfs/linux-2.6/xfs_ioctl32.c
@@ -17,6 +17,7 @@
  */
 #include <linux/compat.h>
 #include <linux/ioctl.h>
+#include <linux/mount.h>
 #include <asm/uaccess.h>
 #include "xfs.h"
 #include "xfs_fs.h"
@@ -340,96 +341,24 @@ xfs_compat_handlereq_copyin(
 	return 0;
 }
 
-/*
- * Convert userspace handle data into inode.
- *
- * We use the fact that all the fsop_handlereq ioctl calls have a data
- * structure argument whose first component is always a xfs_fsop_handlereq_t,
- * so we can pass that sub structure into this handy, shared routine.
- *
- * If no error, caller must always iput the returned inode.
- */
-STATIC int
-xfs_vget_fsop_handlereq_compat(
-	xfs_mount_t		*mp,
-	struct inode		*parinode,	/* parent inode pointer    */
-	compat_xfs_fsop_handlereq_t	*hreq,
-	struct inode		**inode)
+STATIC struct dentry *
+xfs_compat_handlereq_to_dentry(
+	struct file		*parfilp,
+	compat_xfs_fsop_handlereq_t *hreq)
 {
-	void			__user *hanp;
-	size_t			hlen;
-	xfs_fid_t		*xfid;
-	xfs_handle_t		*handlep;
-	xfs_handle_t		handle;
-	xfs_inode_t		*ip;
-	xfs_ino_t		ino;
-	__u32			igen;
-	int			error;
-
-	/*
-	 * Only allow handle opens under a directory.
-	 */
-	if (!S_ISDIR(parinode->i_mode))
-		return XFS_ERROR(ENOTDIR);
-
-	hanp = compat_ptr(hreq->ihandle);
-	hlen = hreq->ihandlen;
-	handlep = &handle;
-
-	if (hlen < sizeof(handlep->ha_fsid) || hlen > sizeof(*handlep))
-		return XFS_ERROR(EINVAL);
-	if (copy_from_user(handlep, hanp, hlen))
-		return XFS_ERROR(EFAULT);
-	if (hlen < sizeof(*handlep))
-		memset(((char *)handlep) + hlen, 0, sizeof(*handlep) - hlen);
-	if (hlen > sizeof(handlep->ha_fsid)) {
-		if (handlep->ha_fid.fid_len !=
-		    (hlen - sizeof(handlep->ha_fsid) -
-			    sizeof(handlep->ha_fid.fid_len)) ||
-		    handlep->ha_fid.fid_pad)
-			return XFS_ERROR(EINVAL);
-	}
-
-	/*
-	 * Crack the handle, obtain the inode # & generation #
-	 */
-	xfid = (struct xfs_fid *)&handlep->ha_fid;
-	if (xfid->fid_len == sizeof(*xfid) - sizeof(xfid->fid_len)) {
-		ino  = xfid->fid_ino;
-		igen = xfid->fid_gen;
-	} else {
-		return XFS_ERROR(EINVAL);
-	}
-
-	/*
-	 * Get the XFS inode, building a Linux inode to go with it.
-	 */
-	error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_SHARED, &ip, 0);
-	if (error)
-		return error;
-	if (ip == NULL)
-		return XFS_ERROR(EIO);
-	if (ip->i_d.di_gen != igen) {
-		xfs_iput_new(ip, XFS_ILOCK_SHARED);
-		return XFS_ERROR(ENOENT);
-	}
-
-	xfs_iunlock(ip, XFS_ILOCK_SHARED);
-
-	*inode = VFS_I(ip);
-	return 0;
+	return xfs_handle_to_dentry(parfilp,
+			compat_ptr(hreq->ihandle), hreq->ihandlen);
 }
 
 STATIC int
 xfs_compat_attrlist_by_handle(
-	xfs_mount_t		*mp,
-	void			__user *arg,
-	struct inode		*parinode)
+	struct file		*parfilp,
+	void			__user *arg)
 {
 	int			error;
 	attrlist_cursor_kern_t	*cursor;
 	compat_xfs_fsop_attrlist_handlereq_t al_hreq;
-	struct inode		*inode;
+	struct dentry		*dentry;
 	char			*kbuf;
 
 	if (!capable(CAP_SYS_ADMIN))
@@ -446,17 +375,17 @@ xfs_compat_attrlist_by_handle(
 	if (al_hreq.flags & ~(ATTR_ROOT | ATTR_SECURE))
 		return -XFS_ERROR(EINVAL);
 
-	error = xfs_vget_fsop_handlereq_compat(mp, parinode, &al_hreq.hreq,
-					       &inode);
-	if (error)
-		goto out;
+	dentry = xfs_compat_handlereq_to_dentry(parfilp, &al_hreq.hreq);
+	if (IS_ERR(dentry))
+		return PTR_ERR(dentry);
 
+	error = -ENOMEM;
 	kbuf = kmalloc(al_hreq.buflen, GFP_KERNEL);
 	if (!kbuf)
-		goto out_vn_rele;
+		goto out_dput;
 
 	cursor = (attrlist_cursor_kern_t *)&al_hreq.pos;
-	error = xfs_attr_list(XFS_I(inode), kbuf, al_hreq.buflen,
+	error = -xfs_attr_list(XFS_I(dentry->d_inode), kbuf, al_hreq.buflen,
 					al_hreq.flags, cursor);
 	if (error)
 		goto out_kfree;
@@ -466,22 +395,20 @@ xfs_compat_attrlist_by_handle(
 
  out_kfree:
 	kfree(kbuf);
- out_vn_rele:
-	iput(inode);
- out:
-	return -error;
+ out_dput:
+	dput(dentry);
+	return error;
 }
 
 STATIC int
 xfs_compat_attrmulti_by_handle(
-	xfs_mount_t				*mp,
-	void					__user *arg,
-	struct inode				*parinode)
+	struct file				*parfilp,
+	void					__user *arg)
 {
 	int					error;
 	compat_xfs_attr_multiop_t		*ops;
 	compat_xfs_fsop_attrmulti_handlereq_t	am_hreq;
-	struct inode				*inode;
+	struct dentry				*dentry;
 	unsigned int				i, size;
 	char					*attr_name;
 
@@ -491,20 +418,19 @@ xfs_compat_attrmulti_by_handle(
 			   sizeof(compat_xfs_fsop_attrmulti_handlereq_t)))
 		return -XFS_ERROR(EFAULT);
 
-	error = xfs_vget_fsop_handlereq_compat(mp, parinode, &am_hreq.hreq,
-					       &inode);
-	if (error)
-		goto out;
+	dentry = xfs_compat_handlereq_to_dentry(parfilp, &am_hreq.hreq);
+	if (IS_ERR(dentry))
+		return PTR_ERR(dentry);
 
 	error = E2BIG;
 	size = am_hreq.opcount * sizeof(compat_xfs_attr_multiop_t);
 	if (!size || size > 16 * PAGE_SIZE)
-		goto out_vn_rele;
+		goto out_dput;
 
 	error = ENOMEM;
 	ops = kmalloc(size, GFP_KERNEL);
 	if (!ops)
-		goto out_vn_rele;
+		goto out_dput;
 
 	error = EFAULT;
 	if (copy_from_user(ops, compat_ptr(am_hreq.ops), size))
@@ -527,20 +453,29 @@ xfs_compat_attrmulti_by_handle(
 
 		switch (ops[i].am_opcode) {
 		case ATTR_OP_GET:
-			ops[i].am_error = xfs_attrmulti_attr_get(inode,
-					attr_name,
+			ops[i].am_error = xfs_attrmulti_attr_get(
+					dentry->d_inode, attr_name,
 					compat_ptr(ops[i].am_attrvalue),
 					&ops[i].am_length, ops[i].am_flags);
 			break;
 		case ATTR_OP_SET:
-			ops[i].am_error = xfs_attrmulti_attr_set(inode,
-					attr_name,
+			ops[i].am_error = mnt_want_write(parfilp->f_path.mnt);
+			if (ops[i].am_error)
+				break;
+			ops[i].am_error = xfs_attrmulti_attr_set(
+					dentry->d_inode, attr_name,
 					compat_ptr(ops[i].am_attrvalue),
 					ops[i].am_length, ops[i].am_flags);
+			mnt_drop_write(parfilp->f_path.mnt);
 			break;
 		case ATTR_OP_REMOVE:
-			ops[i].am_error = xfs_attrmulti_attr_remove(inode,
-					attr_name, ops[i].am_flags);
+			ops[i].am_error = mnt_want_write(parfilp->f_path.mnt);
+			if (ops[i].am_error)
+				break;
+			ops[i].am_error = xfs_attrmulti_attr_remove(
+					dentry->d_inode, attr_name,
+					ops[i].am_flags);
+			mnt_drop_write(parfilp->f_path.mnt);
 			break;
 		default:
 			ops[i].am_error = EINVAL;
@@ -553,22 +488,20 @@ xfs_compat_attrmulti_by_handle(
 	kfree(attr_name);
  out_kfree_ops:
 	kfree(ops);
- out_vn_rele:
-	iput(inode);
- out:
+ out_dput:
+	dput(dentry);
 	return -error;
 }
 
 STATIC int
 xfs_compat_fssetdm_by_handle(
-	xfs_mount_t		*mp,
-	void			__user *arg,
-	struct inode		*parinode)
+	struct file		*parfilp,
+	void			__user *arg)
 {
 	int			error;
 	struct fsdmidata	fsd;
 	compat_xfs_fsop_setdm_handlereq_t dmhreq;
-	struct inode		*inode;
+	struct dentry		*dentry;
 
 	if (!capable(CAP_MKNOD))
 		return -XFS_ERROR(EPERM);
@@ -576,12 +509,11 @@ xfs_compat_fssetdm_by_handle(
 			   sizeof(compat_xfs_fsop_setdm_handlereq_t)))
 		return -XFS_ERROR(EFAULT);
 
-	error = xfs_vget_fsop_handlereq_compat(mp, parinode, &dmhreq.hreq,
-					       &inode);
-	if (error)
-		return -error;
+	dentry = xfs_compat_handlereq_to_dentry(parfilp, &dmhreq.hreq);
+	if (IS_ERR(dentry))
+		return PTR_ERR(dentry);
 
-	if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) {
+	if (IS_IMMUTABLE(dentry->d_inode) || IS_APPEND(dentry->d_inode)) {
 		error = -XFS_ERROR(EPERM);
 		goto out;
 	}
@@ -591,11 +523,11 @@ xfs_compat_fssetdm_by_handle(
 		goto out;
 	}
 
-	error = -xfs_set_dmattrs(XFS_I(inode), fsd.fsd_dmevmask,
+	error = -xfs_set_dmattrs(XFS_I(dentry->d_inode), fsd.fsd_dmevmask,
 				 fsd.fsd_dmstate);
 
 out:
-	iput(inode);
+	dput(dentry);
 	return error;
 }
 
@@ -722,21 +654,21 @@ xfs_file_compat_ioctl(
 
 		if (xfs_compat_handlereq_copyin(&hreq, arg))
 			return -XFS_ERROR(EFAULT);
-		return xfs_open_by_handle(mp, &hreq, filp, inode);
+		return xfs_open_by_handle(filp, &hreq);
 	}
 	case XFS_IOC_READLINK_BY_HANDLE_32: {
 		struct xfs_fsop_handlereq	hreq;
 
 		if (xfs_compat_handlereq_copyin(&hreq, arg))
 			return -XFS_ERROR(EFAULT);
-		return xfs_readlink_by_handle(mp, &hreq, inode);
+		return xfs_readlink_by_handle(filp, &hreq);
 	}
 	case XFS_IOC_ATTRLIST_BY_HANDLE_32:
-		return xfs_compat_attrlist_by_handle(mp, arg, inode);
+		return xfs_compat_attrlist_by_handle(filp, arg);
 	case XFS_IOC_ATTRMULTI_BY_HANDLE_32:
-		return xfs_compat_attrmulti_by_handle(mp, arg, inode);
+		return xfs_compat_attrmulti_by_handle(filp, arg);
 	case XFS_IOC_FSSETDM_BY_HANDLE_32:
-		return xfs_compat_fssetdm_by_handle(mp, arg, inode);
+		return xfs_compat_fssetdm_by_handle(filp, arg);
 	default:
 		return -XFS_ERROR(ENOIOCTLCMD);
 	}
diff --git a/fs/xfs/linux-2.6/xfs_super.c b/fs/xfs/linux-2.6/xfs_super.c
index 95a971080368..c71e226da7f5 100644
--- a/fs/xfs/linux-2.6/xfs_super.c
+++ b/fs/xfs/linux-2.6/xfs_super.c
@@ -1197,6 +1197,7 @@ xfs_fs_remount(
 	struct xfs_mount	*mp = XFS_M(sb);
 	substring_t		args[MAX_OPT_ARGS];
 	char			*p;
+	int			error;
 
 	while ((p = strsep(&options, ",")) != NULL) {
 		int token;
@@ -1247,11 +1248,25 @@ xfs_fs_remount(
 		}
 	}
 
-	/* rw/ro -> rw */
+	/* ro -> rw */
 	if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) {
 		mp->m_flags &= ~XFS_MOUNT_RDONLY;
 		if (mp->m_flags & XFS_MOUNT_BARRIER)
 			xfs_mountfs_check_barriers(mp);
+
+		/*
+		 * If this is the first remount to writeable state we
+		 * might have some superblock changes to update.
+		 */
+		if (mp->m_update_flags) {
+			error = xfs_mount_log_sb(mp, mp->m_update_flags);
+			if (error) {
+				cmn_err(CE_WARN,
+					"XFS: failed to write sb changes");
+				return error;
+			}
+			mp->m_update_flags = 0;
+		}
 	}
 
 	/* rw -> ro */
diff --git a/fs/xfs/quota/xfs_dquot.c b/fs/xfs/quota/xfs_dquot.c
index d68b4e1cf1d1..6543c0b29753 100644
--- a/fs/xfs/quota/xfs_dquot.c
+++ b/fs/xfs/quota/xfs_dquot.c
@@ -73,6 +73,8 @@ int xfs_dqreq_num;
 int xfs_dqerror_mod = 33;
 #endif
 
+static struct lock_class_key xfs_dquot_other_class;
+
 /*
  * Allocate and initialize a dquot. We don't always allocate fresh memory;
  * we try to reclaim a free dquot if the number of incore dquots are above
@@ -139,7 +141,15 @@ xfs_qm_dqinit(
 		 ASSERT(dqp->q_trace);
 		 xfs_dqtrace_entry(dqp, "DQRECLAIMED_INIT");
 #endif
-	 }
+	}
+
+	/*
+	 * In either case we need to make sure group quotas have a different
+	 * lock class than user quotas, to make sure lockdep knows we can
+	 * locks of one of each at the same time.
+	 */
+	if (!(type & XFS_DQ_USER))
+		lockdep_set_class(&dqp->q_qlock, &xfs_dquot_other_class);
 
 	/*
 	 * log item gets initialized later
@@ -1383,6 +1393,12 @@ xfs_dqunlock_nonotify(
 	mutex_unlock(&(dqp->q_qlock));
 }
 
+/*
+ * Lock two xfs_dquot structures.
+ *
+ * To avoid deadlocks we always lock the quota structure with
+ * the lowerd id first.
+ */
 void
 xfs_dqlock2(
 	xfs_dquot_t	*d1,
@@ -1392,18 +1408,16 @@ xfs_dqlock2(
 		ASSERT(d1 != d2);
 		if (be32_to_cpu(d1->q_core.d_id) >
 		    be32_to_cpu(d2->q_core.d_id)) {
-			xfs_dqlock(d2);
-			xfs_dqlock(d1);
+			mutex_lock(&d2->q_qlock);
+			mutex_lock_nested(&d1->q_qlock, XFS_QLOCK_NESTED);
 		} else {
-			xfs_dqlock(d1);
-			xfs_dqlock(d2);
-		}
-	} else {
-		if (d1) {
-			xfs_dqlock(d1);
-		} else if (d2) {
-			xfs_dqlock(d2);
+			mutex_lock(&d1->q_qlock);
+			mutex_lock_nested(&d2->q_qlock, XFS_QLOCK_NESTED);
 		}
+	} else if (d1) {
+		mutex_lock(&d1->q_qlock);
+	} else if (d2) {
+		mutex_lock(&d2->q_qlock);
 	}
 }
 
diff --git a/fs/xfs/quota/xfs_dquot.h b/fs/xfs/quota/xfs_dquot.h
index 7e455337e2ba..d443e93b4331 100644
--- a/fs/xfs/quota/xfs_dquot.h
+++ b/fs/xfs/quota/xfs_dquot.h
@@ -97,6 +97,16 @@ typedef struct xfs_dquot {
 #define dq_hashlist	q_lists.dqm_hashlist
 #define dq_flags	q_lists.dqm_flags
 
+/*
+ * Lock hierachy for q_qlock:
+ *	XFS_QLOCK_NORMAL is the implicit default,
+ * 	XFS_QLOCK_NESTED is the dquot with the higher id in xfs_dqlock2
+ */
+enum {
+	XFS_QLOCK_NORMAL = 0,
+	XFS_QLOCK_NESTED,
+};
+
 #define XFS_DQHOLD(dqp)		((dqp)->q_nrefs++)
 
 #ifdef DEBUG
diff --git a/fs/xfs/quota/xfs_qm.c b/fs/xfs/quota/xfs_qm.c
index 6b13960cf318..7a2beb64314f 100644
--- a/fs/xfs/quota/xfs_qm.c
+++ b/fs/xfs/quota/xfs_qm.c
@@ -1070,6 +1070,13 @@ xfs_qm_sync(
 	return 0;
 }
 
+/*
+ * The hash chains and the mplist use the same xfs_dqhash structure as
+ * their list head, but we can take the mplist qh_lock and one of the
+ * hash qh_locks at the same time without any problem as they aren't
+ * related.
+ */
+static struct lock_class_key xfs_quota_mplist_class;
 
 /*
  * This initializes all the quota information that's kept in the
@@ -1105,6 +1112,8 @@ xfs_qm_init_quotainfo(
 	}
 
 	xfs_qm_list_init(&qinf->qi_dqlist, "mpdqlist", 0);
+	lockdep_set_class(&qinf->qi_dqlist.qh_lock, &xfs_quota_mplist_class);
+
 	qinf->qi_dqreclaims = 0;
 
 	/* mutex used to serialize quotaoffs */
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index be2ca4d67b53..e7ae08d1df48 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -424,6 +424,19 @@ xfs_iformat(
 	case XFS_DINODE_FMT_LOCAL:
 		atp = (xfs_attr_shortform_t *)XFS_DFORK_APTR(dip);
 		size = be16_to_cpu(atp->hdr.totsize);
+
+		if (unlikely(size < sizeof(struct xfs_attr_sf_hdr))) {
+			xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount,
+				"corrupt inode %Lu "
+				"(bad attr fork size %Ld).",
+				(unsigned long long) ip->i_ino,
+				(long long) size);
+			XFS_CORRUPTION_ERROR("xfs_iformat(8)",
+					     XFS_ERRLEVEL_LOW,
+					     ip->i_mount, dip);
+			return XFS_ERROR(EFSCORRUPTED);
+		}
+
 		error = xfs_iformat_local(ip, dip, XFS_ATTR_FORK, size);
 		break;
 	case XFS_DINODE_FMT_EXTENTS:
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 3c97c6463a4e..35300250e86d 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -45,7 +45,6 @@
 #include "xfs_fsops.h"
 #include "xfs_utils.h"
 
-STATIC int	xfs_mount_log_sb(xfs_mount_t *, __int64_t);
 STATIC int	xfs_uuid_mount(xfs_mount_t *);
 STATIC void	xfs_unmountfs_wait(xfs_mount_t *);
 
@@ -682,7 +681,7 @@ xfs_initialize_perag_data(xfs_mount_t *mp, xfs_agnumber_t agcount)
  * Update alignment values based on mount options and sb values
  */
 STATIC int
-xfs_update_alignment(xfs_mount_t *mp, __uint64_t *update_flags)
+xfs_update_alignment(xfs_mount_t *mp)
 {
 	xfs_sb_t	*sbp = &(mp->m_sb);
 
@@ -736,11 +735,11 @@ xfs_update_alignment(xfs_mount_t *mp, __uint64_t *update_flags)
 		if (xfs_sb_version_hasdalign(sbp)) {
 			if (sbp->sb_unit != mp->m_dalign) {
 				sbp->sb_unit = mp->m_dalign;
-				*update_flags |= XFS_SB_UNIT;
+				mp->m_update_flags |= XFS_SB_UNIT;
 			}
 			if (sbp->sb_width != mp->m_swidth) {
 				sbp->sb_width = mp->m_swidth;
-				*update_flags |= XFS_SB_WIDTH;
+				mp->m_update_flags |= XFS_SB_WIDTH;
 			}
 		}
 	} else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN &&
@@ -905,7 +904,6 @@ xfs_mountfs(
 	xfs_sb_t	*sbp = &(mp->m_sb);
 	xfs_inode_t	*rip;
 	__uint64_t	resblks;
-	__int64_t	update_flags = 0LL;
 	uint		quotamount, quotaflags;
 	int		uuid_mounted = 0;
 	int		error = 0;
@@ -933,7 +931,7 @@ xfs_mountfs(
 			"XFS: correcting sb_features alignment problem");
 		sbp->sb_features2 |= sbp->sb_bad_features2;
 		sbp->sb_bad_features2 = sbp->sb_features2;
-		update_flags |= XFS_SB_FEATURES2 | XFS_SB_BAD_FEATURES2;
+		mp->m_update_flags |= XFS_SB_FEATURES2 | XFS_SB_BAD_FEATURES2;
 
 		/*
 		 * Re-check for ATTR2 in case it was found in bad_features2
@@ -947,11 +945,11 @@ xfs_mountfs(
 	if (xfs_sb_version_hasattr2(&mp->m_sb) &&
 	   (mp->m_flags & XFS_MOUNT_NOATTR2)) {
 		xfs_sb_version_removeattr2(&mp->m_sb);
-		update_flags |= XFS_SB_FEATURES2;
+		mp->m_update_flags |= XFS_SB_FEATURES2;
 
 		/* update sb_versionnum for the clearing of the morebits */
 		if (!sbp->sb_features2)
-			update_flags |= XFS_SB_VERSIONNUM;
+			mp->m_update_flags |= XFS_SB_VERSIONNUM;
 	}
 
 	/*
@@ -960,7 +958,7 @@ xfs_mountfs(
 	 * allocator alignment is within an ag, therefore ag has
 	 * to be aligned at stripe boundary.
 	 */
-	error = xfs_update_alignment(mp, &update_flags);
+	error = xfs_update_alignment(mp);
 	if (error)
 		goto error1;
 
@@ -1137,10 +1135,12 @@ xfs_mountfs(
 	}
 
 	/*
-	 * If fs is not mounted readonly, then update the superblock changes.
+	 * If this is a read-only mount defer the superblock updates until
+	 * the next remount into writeable mode.  Otherwise we would never
+	 * perform the update e.g. for the root filesystem.
 	 */
-	if (update_flags && !(mp->m_flags & XFS_MOUNT_RDONLY)) {
-		error = xfs_mount_log_sb(mp, update_flags);
+	if (mp->m_update_flags && !(mp->m_flags & XFS_MOUNT_RDONLY)) {
+		error = xfs_mount_log_sb(mp, mp->m_update_flags);
 		if (error) {
 			cmn_err(CE_WARN, "XFS: failed to write sb changes");
 			goto error4;
@@ -1820,7 +1820,7 @@ xfs_uuid_mount(
  * be altered by the mount options, as well as any potential sb_features2
  * fixup. Only the first superblock is updated.
  */
-STATIC int
+int
 xfs_mount_log_sb(
 	xfs_mount_t	*mp,
 	__int64_t	fields)
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index 9bb41a9f765d..f5e9937f9bdb 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -327,6 +327,8 @@ typedef struct xfs_mount {
 	spinlock_t		m_sync_lock;	/* work item list lock */
 	int			m_sync_seq;	/* sync thread generation no. */
 	wait_queue_head_t	m_wait_single_sync_task;
+	__int64_t		m_update_flags;	/* sb flags we need to update
+						   on the next remount,rw */
 } xfs_mount_t;
 
 /*
@@ -512,6 +514,7 @@ extern int	xfs_mod_incore_sb_unlocked(xfs_mount_t *, xfs_sb_field_t,
 			int64_t, int);
 extern int	xfs_mod_incore_sb_batch(xfs_mount_t *, xfs_mod_sb_t *,
 			uint, int);
+extern int	xfs_mount_log_sb(xfs_mount_t *, __int64_t);
 extern struct xfs_buf *xfs_getsb(xfs_mount_t *, int);
 extern int	xfs_readsb(xfs_mount_t *, int);
 extern void	xfs_freesb(xfs_mount_t *);