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-rw-r--r--fs/xfs/xfs_dfrag.c387
1 files changed, 387 insertions, 0 deletions
diff --git a/fs/xfs/xfs_dfrag.c b/fs/xfs/xfs_dfrag.c
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index 000000000000..08d551a17347
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+++ b/fs/xfs/xfs_dfrag.c
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+/*
+ * Copyright (c) 2000-2002 Silicon Graphics, Inc. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 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.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like. Any license provided herein, whether implied or
+ * otherwise, applies only to this software file. Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA 94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+
+#include "xfs.h"
+#include "xfs_macros.h"
+#include "xfs_types.h"
+#include "xfs_inum.h"
+#include "xfs_log.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_dir.h"
+#include "xfs_dir2.h"
+#include "xfs_dmapi.h"
+#include "xfs_mount.h"
+#include "xfs_ag.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_btree.h"
+#include "xfs_attr_sf.h"
+#include "xfs_dir_sf.h"
+#include "xfs_dir2_sf.h"
+#include "xfs_dinode.h"
+#include "xfs_inode_item.h"
+#include "xfs_inode.h"
+#include "xfs_bmap.h"
+#include "xfs_ialloc.h"
+#include "xfs_itable.h"
+#include "xfs_dfrag.h"
+#include "xfs_error.h"
+#include "xfs_mac.h"
+#include "xfs_rw.h"
+
+/*
+ * Syssgi interface for swapext
+ */
+int
+xfs_swapext(
+ xfs_swapext_t __user *sxp)
+{
+ xfs_swapext_t sx;
+ xfs_inode_t *ip=NULL, *tip=NULL, *ips[2];
+ xfs_trans_t *tp;
+ xfs_mount_t *mp;
+ xfs_bstat_t *sbp;
+ struct file *fp = NULL, *tfp = NULL;
+ vnode_t *vp, *tvp;
+ bhv_desc_t *bdp, *tbdp;
+ vn_bhv_head_t *bhp, *tbhp;
+ uint lock_flags=0;
+ int ilf_fields, tilf_fields;
+ int error = 0;
+ xfs_ifork_t tempif, *ifp, *tifp;
+ __uint64_t tmp;
+ int aforkblks = 0;
+ int taforkblks = 0;
+ int locked = 0;
+
+ if (copy_from_user(&sx, sxp, sizeof(sx)))
+ return XFS_ERROR(EFAULT);
+
+ /* Pull information for the target fd */
+ if (((fp = fget((int)sx.sx_fdtarget)) == NULL) ||
+ ((vp = LINVFS_GET_VP(fp->f_dentry->d_inode)) == NULL)) {
+ error = XFS_ERROR(EINVAL);
+ goto error0;
+ }
+
+ bhp = VN_BHV_HEAD(vp);
+ bdp = vn_bhv_lookup(bhp, &xfs_vnodeops);
+ if (bdp == NULL) {
+ error = XFS_ERROR(EBADF);
+ goto error0;
+ } else {
+ ip = XFS_BHVTOI(bdp);
+ }
+
+ if (((tfp = fget((int)sx.sx_fdtmp)) == NULL) ||
+ ((tvp = LINVFS_GET_VP(tfp->f_dentry->d_inode)) == NULL)) {
+ error = XFS_ERROR(EINVAL);
+ goto error0;
+ }
+
+ tbhp = VN_BHV_HEAD(tvp);
+ tbdp = vn_bhv_lookup(tbhp, &xfs_vnodeops);
+ if (tbdp == NULL) {
+ error = XFS_ERROR(EBADF);
+ goto error0;
+ } else {
+ tip = XFS_BHVTOI(tbdp);
+ }
+
+ if (ip->i_mount != tip->i_mount) {
+ error = XFS_ERROR(EINVAL);
+ goto error0;
+ }
+
+ if (ip->i_ino == tip->i_ino) {
+ error = XFS_ERROR(EINVAL);
+ goto error0;
+ }
+
+ mp = ip->i_mount;
+
+ sbp = &sx.sx_stat;
+
+ if (XFS_FORCED_SHUTDOWN(mp)) {
+ error = XFS_ERROR(EIO);
+ goto error0;
+ }
+
+ locked = 1;
+
+ /* Lock in i_ino order */
+ if (ip->i_ino < tip->i_ino) {
+ ips[0] = ip;
+ ips[1] = tip;
+ } else {
+ ips[0] = tip;
+ ips[1] = ip;
+ }
+ lock_flags = XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL;
+ xfs_lock_inodes(ips, 2, 0, lock_flags);
+
+ /* Check permissions */
+ error = xfs_iaccess(ip, S_IWUSR, NULL);
+ if (error)
+ goto error0;
+
+ error = xfs_iaccess(tip, S_IWUSR, NULL);
+ if (error)
+ goto error0;
+
+ /* 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 ((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) !=
+ (tip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
+ 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(tvp) != 0)
+ xfs_inval_cached_pages(XFS_ITOV(tip), &(tip->i_iocore),
+ (loff_t)0, 0, 0);
+
+ /* Verify O_DIRECT for ftmp */
+ if (VN_CACHED(tvp) != 0) {
+ error = XFS_ERROR(EINVAL);
+ goto error0;
+ }
+
+ /* Verify all data are being swapped */
+ if (sx.sx_offset != 0 ||
+ sx.sx_length != ip->i_d.di_size ||
+ sx.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(vp)) {
+ 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.
+ */
+
+ VOP_TOSS_PAGES(vp, 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);
+ return error;
+ }
+ xfs_lock_inodes(ips, 2, 0, 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_iunlock(ip, lock_flags);
+ xfs_iunlock(tip, lock_flags);
+ xfs_trans_cancel(tp, 0);
+ return error;
+ }
+ }
+ 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_iunlock(ip, lock_flags);
+ xfs_iunlock(tip, lock_flags);
+ xfs_trans_cancel(tp, 0);
+ return error;
+ }
+ }
+
+ /*
+ * Swap the data forks of the inodes
+ */
+ ifp = &ip->i_df;
+ tifp = &tip->i_df;
+ tempif = *ifp; /* struct copy */
+ *ifp = *tifp; /* struct copy */
+ *tifp = tempif; /* 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;
+ }
+
+ /*
+ * Increment vnode ref counts since xfs_trans_commit &
+ * xfs_trans_cancel will both unlock the inodes and
+ * decrement the associated ref counts.
+ */
+ VN_HOLD(vp);
+ VN_HOLD(tvp);
+
+ xfs_trans_ijoin(tp, ip, lock_flags);
+ 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, NULL);
+
+ fput(fp);
+ fput(tfp);
+
+ return error;
+
+ error0:
+ if (locked) {
+ xfs_iunlock(ip, lock_flags);
+ xfs_iunlock(tip, lock_flags);
+ }
+
+ if (fp != NULL) fput(fp);
+ if (tfp != NULL) fput(tfp);
+
+ return error;
+}
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