Initial import of modified Linux 2.6.28 tree

Original upstream URL:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git | branch linux-2.6.28.y

1 files changed, 376 insertions, 0 deletions

diff --git a/fs/xfs/xfs_dfrag.c b/fs/xfs/xfs_dfrag.c
new file mode 100644
index 0000000..75b0cd4
--- /dev/null
+++ b/fs/xfs/xfs_dfrag.c
@@ -0,0 +1,376 @@
+/*
+ * Copyright (c) 2000-2006 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_types.h"
+#include "xfs_bit.h"
+#include "xfs_log.h"
+#include "xfs_inum.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_ag.h"
+#include "xfs_dir2.h"
+#include "xfs_dmapi.h"
+#include "xfs_mount.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_dir2_sf.h"
+#include "xfs_attr_sf.h"
+#include "xfs_dinode.h"
+#include "xfs_inode.h"
+#include "xfs_inode_item.h"
+#include "xfs_bmap.h"
+#include "xfs_btree.h"
+#include "xfs_ialloc.h"
+#include "xfs_itable.h"
+#include "xfs_dfrag.h"
+#include "xfs_error.h"
+#include "xfs_rw.h"
+#include "xfs_vnodeops.h"
+
+/*
+ * Syssgi interface for swapext
+ */
+int
+xfs_swapext(
+	xfs_swapext_t	__user *sxu)
+{
+	xfs_swapext_t	*sxp;
+	xfs_inode_t     *ip, *tip;
+	struct file	*file, *target_file;
+	int		error = 0;
+
+	sxp = kmem_alloc(sizeof(xfs_swapext_t), KM_MAYFAIL);
+	if (!sxp) {
+		error = XFS_ERROR(ENOMEM);
+		goto out;
+	}
+
+	if (copy_from_user(sxp, sxu, sizeof(xfs_swapext_t))) {
+		error = XFS_ERROR(EFAULT);
+		goto out_free_sxp;
+	}
+
+	/* Pull information for the target fd */
+	file = fget((int)sxp->sx_fdtarget);
+	if (!file) {
+		error = XFS_ERROR(EINVAL);
+		goto out_free_sxp;
+	}
+
+	if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) {
+		error = XFS_ERROR(EBADF);
+		goto out_put_file;
+	}
+
+	target_file = fget((int)sxp->sx_fdtmp);
+	if (!target_file) {
+		error = XFS_ERROR(EINVAL);
+		goto out_put_file;
+	}
+
+	if (!(target_file->f_mode & FMODE_WRITE) ||
+	    (target_file->f_flags & O_APPEND)) {
+		error = XFS_ERROR(EBADF);
+		goto out_put_target_file;
+	}
+
+	ip = XFS_I(file->f_path.dentry->d_inode);
+	tip = XFS_I(target_file->f_path.dentry->d_inode);
+
+	if (ip->i_mount != tip->i_mount) {
+		error = XFS_ERROR(EINVAL);
+		goto out_put_target_file;
+	}
+
+	if (ip->i_ino == tip->i_ino) {
+		error = XFS_ERROR(EINVAL);
+		goto out_put_target_file;
+	}
+
+	if (XFS_FORCED_SHUTDOWN(ip->i_mount)) {
+		error = XFS_ERROR(EIO);
+		goto out_put_target_file;
+	}
+
+	error = xfs_swap_extents(ip, tip, sxp);
+
+ out_put_target_file:
+	fput(target_file);
+ out_put_file:
+	fput(file);
+ out_free_sxp:
+	kmem_free(sxp);
+ out:
+	return error;
+}
+
+int
+xfs_swap_extents(
+	xfs_inode_t	*ip,
+	xfs_inode_t	*tip,
+	xfs_swapext_t	*sxp)
+{
+	xfs_mount_t	*mp;
+	xfs_trans_t	*tp;
+	xfs_bstat_t	*sbp = &sxp->sx_stat;
+	xfs_ifork_t	*tempifp, *ifp, *tifp;
+	int		ilf_fields, tilf_fields;
+	static uint	lock_flags = XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL;
+	int		error = 0;
+	int		aforkblks = 0;
+	int		taforkblks = 0;
+	__uint64_t	tmp;
+	char		locked = 0;
+
+	mp = ip->i_mount;
+
+	tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL);
+	if (!tempifp) {
+		error = XFS_ERROR(ENOMEM);
+		goto error0;
+	}
+
+	sbp = &sxp->sx_stat;
+
+	/*
+	 * we have to do two separate lock calls here to keep lockdep
+	 * happy. If we try to get all the locks in one call, lock will
+	 * report false positives when we drop the ILOCK and regain them
+	 * below.
+	 */
+	xfs_lock_two_inodes(ip, tip, XFS_IOLOCK_EXCL);
+	xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL);
+	locked = 1;
+
+	/* Verify that both files have the same format */
+	if ((ip->i_d.di_mode & S_IFMT) != (tip->i_d.di_mode & S_IFMT)) {
+		error = XFS_ERROR(EINVAL);
+		goto error0;
+	}
+
+	/* Verify both files are either real-time or non-realtime */
+	if (XFS_IS_REALTIME_INODE(ip) != XFS_IS_REALTIME_INODE(tip)) {
+		error = XFS_ERROR(EINVAL);
+		goto error0;
+	}
+
+	/* Should never get a local format */
+	if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL ||
+	    tip->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
+		error = XFS_ERROR(EINVAL);
+		goto error0;
+	}
+
+	if (VN_CACHED(VFS_I(tip)) != 0) {
+		xfs_inval_cached_trace(tip, 0, -1, 0, -1);
+		error = xfs_flushinval_pages(tip, 0, -1,
+				FI_REMAPF_LOCKED);
+		if (error)
+			goto error0;
+	}
+
+	/* Verify O_DIRECT for ftmp */
+	if (VN_CACHED(VFS_I(tip)) != 0) {
+		error = XFS_ERROR(EINVAL);
+		goto error0;
+	}
+
+	/* Verify all data are being swapped */
+	if (sxp->sx_offset != 0 ||
+	    sxp->sx_length != ip->i_d.di_size ||
+	    sxp->sx_length != tip->i_d.di_size) {
+		error = XFS_ERROR(EFAULT);
+		goto error0;
+	}
+
+	/*
+	 * If the target has extended attributes, the tmp file
+	 * must also in order to ensure the correct data fork
+	 * format.
+	 */
+	if ( XFS_IFORK_Q(ip) != XFS_IFORK_Q(tip) ) {
+		error = XFS_ERROR(EINVAL);
+		goto error0;
+	}
+
+	/*
+	 * Compare the current change & modify times with that
+	 * passed in.  If they differ, we abort this swap.
+	 * This is the mechanism used to ensure the calling
+	 * process that the file was not changed out from
+	 * under it.
+	 */
+	if ((sbp->bs_ctime.tv_sec != ip->i_d.di_ctime.t_sec) ||
+	    (sbp->bs_ctime.tv_nsec != ip->i_d.di_ctime.t_nsec) ||
+	    (sbp->bs_mtime.tv_sec != ip->i_d.di_mtime.t_sec) ||
+	    (sbp->bs_mtime.tv_nsec != ip->i_d.di_mtime.t_nsec)) {
+		error = XFS_ERROR(EBUSY);
+		goto error0;
+	}
+
+	/* We need to fail if the file is memory mapped.  Once we have tossed
+	 * all existing pages, the page fault will have no option
+	 * but to go to the filesystem for pages. By making the page fault call
+	 * vop_read (or write in the case of autogrow) they block on the iolock
+	 * until we have switched the extents.
+	 */
+	if (VN_MAPPED(VFS_I(ip))) {
+		error = XFS_ERROR(EBUSY);
+		goto error0;
+	}
+
+	xfs_iunlock(ip, XFS_ILOCK_EXCL);
+	xfs_iunlock(tip, XFS_ILOCK_EXCL);
+
+	/*
+	 * There is a race condition here since we gave up the
+	 * ilock.  However, the data fork will not change since
+	 * we have the iolock (locked for truncation too) so we
+	 * are safe.  We don't really care if non-io related
+	 * fields change.
+	 */
+
+	xfs_tosspages(ip, 0, -1, FI_REMAPF);
+
+	tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT);
+	if ((error = xfs_trans_reserve(tp, 0,
+				     XFS_ICHANGE_LOG_RES(mp), 0,
+				     0, 0))) {
+		xfs_iunlock(ip,  XFS_IOLOCK_EXCL);
+		xfs_iunlock(tip, XFS_IOLOCK_EXCL);
+		xfs_trans_cancel(tp, 0);
+		locked = 0;
+		goto error0;
+	}
+	xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL);
+
+	/*
+	 * Count the number of extended attribute blocks
+	 */
+	if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) &&
+	     (ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
+		error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks);
+		if (error) {
+			xfs_trans_cancel(tp, 0);
+			goto error0;
+		}
+	}
+	if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) &&
+	     (tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
+		error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK,
+			&taforkblks);
+		if (error) {
+			xfs_trans_cancel(tp, 0);
+			goto error0;
+		}
+	}
+
+	/*
+	 * Swap the data forks of the inodes
+	 */
+	ifp = &ip->i_df;
+	tifp = &tip->i_df;
+	*tempifp = *ifp;	/* struct copy */
+	*ifp = *tifp;		/* struct copy */
+	*tifp = *tempifp;	/* struct copy */
+
+	/*
+	 * Fix the on-disk inode values
+	 */
+	tmp = (__uint64_t)ip->i_d.di_nblocks;
+	ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks;
+	tip->i_d.di_nblocks = tmp + taforkblks - aforkblks;
+
+	tmp = (__uint64_t) ip->i_d.di_nextents;
+	ip->i_d.di_nextents = tip->i_d.di_nextents;
+	tip->i_d.di_nextents = tmp;
+
+	tmp = (__uint64_t) ip->i_d.di_format;
+	ip->i_d.di_format = tip->i_d.di_format;
+	tip->i_d.di_format = tmp;
+
+	ilf_fields = XFS_ILOG_CORE;
+
+	switch(ip->i_d.di_format) {
+	case XFS_DINODE_FMT_EXTENTS:
+		/* If the extents fit in the inode, fix the
+		 * pointer.  Otherwise it's already NULL or
+		 * pointing to the extent.
+		 */
+		if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) {
+			ifp->if_u1.if_extents =
+				ifp->if_u2.if_inline_ext;
+		}
+		ilf_fields |= XFS_ILOG_DEXT;
+		break;
+	case XFS_DINODE_FMT_BTREE:
+		ilf_fields |= XFS_ILOG_DBROOT;
+		break;
+	}
+
+	tilf_fields = XFS_ILOG_CORE;
+
+	switch(tip->i_d.di_format) {
+	case XFS_DINODE_FMT_EXTENTS:
+		/* If the extents fit in the inode, fix the
+		 * pointer.  Otherwise it's already NULL or
+		 * pointing to the extent.
+		 */
+		if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) {
+			tifp->if_u1.if_extents =
+				tifp->if_u2.if_inline_ext;
+		}
+		tilf_fields |= XFS_ILOG_DEXT;
+		break;
+	case XFS_DINODE_FMT_BTREE:
+		tilf_fields |= XFS_ILOG_DBROOT;
+		break;
+	}
+
+
+	IHOLD(ip);
+	xfs_trans_ijoin(tp, ip, lock_flags);
+
+	IHOLD(tip);
+	xfs_trans_ijoin(tp, tip, lock_flags);
+
+	xfs_trans_log_inode(tp, ip,  ilf_fields);
+	xfs_trans_log_inode(tp, tip, tilf_fields);
+
+	/*
+	 * If this is a synchronous mount, make sure that the
+	 * transaction goes to disk before returning to the user.
+	 */
+	if (mp->m_flags & XFS_MOUNT_WSYNC) {
+		xfs_trans_set_sync(tp);
+	}
+
+	error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT);
+	locked = 0;
+
+ error0:
+	if (locked) {
+		xfs_iunlock(ip,  lock_flags);
+		xfs_iunlock(tip, lock_flags);
+	}
+	if (tempifp != NULL)
+		kmem_free(tempifp);
+	return error;
+}