fs/xfs/xfs_vnodeops.c



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/*
 * 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_da_btree.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_itable.h"
#include "xfs_btree.h"
#include "xfs_ialloc.h"
#include "xfs_alloc.h"
#include "xfs_bmap.h"
#include "xfs_attr.h"
#include "xfs_rw.h"
#include "xfs_error.h"
#include "xfs_quota.h"
#include "xfs_utils.h"
#include "xfs_rtalloc.h"
#include "xfs_trans_space.h"
#include "xfs_log_priv.h"
#include "xfs_filestream.h"
#include "xfs_vnodeops.h"

int
xfs_setattr(
	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			code;
	uint			lock_flags;
	uint			commit_flags=0;
	uid_t			uid=0, iuid=0;
	gid_t			gid=0, igid=0;
	int			timeflags = 0;
	struct xfs_dquot	*udqp, *gdqp, *olddquot1, *olddquot2;
	int			need_iolock = 1;

	xfs_itrace_entry(ip);

	if (mp->m_flags & XFS_MOUNT_RDONLY)
		return XFS_ERROR(EROFS);

	if (XFS_FORCED_SHUTDOWN(mp))
		return XFS_ERROR(EIO);

	code = -inode_change_ok(inode, iattr);
	if (code)
		return code;

	olddquot1 = olddquot2 = NULL;
	udqp = gdqp = NULL;

	/*
	 * 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);
		code = XFS_QM_DQVOPALLOC(mp, ip, uid, gid, ip->i_d.di_projid,
					 qflags, &udqp, &gdqp);
		if (code)
			return code;
	}

	/*
	 * For the other attributes, we acquire the inode lock and
	 * first do an error checking pass.
	 */
	tp = NULL;
	lock_flags = XFS_ILOCK_EXCL;
	if (flags & XFS_ATTR_NOLOCK)
		need_iolock = 0;
	if (!(mask & ATTR_SIZE)) {
		if ((mask != (ATTR_CTIME|ATTR_ATIME|ATTR_MTIME)) ||
		    (mp->m_flags & XFS_MOUNT_WSYNC)) {
			tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE);
			commit_flags = 0;
			if ((code = xfs_trans_reserve(tp, 0,
						     XFS_ICHANGE_LOG_RES(mp), 0,
						     0, 0))) {
				lock_flags = 0;
				goto error_return;
			}
		}
	} else {
		if (DM_EVENT_ENABLED(ip, DM_EVENT_TRUNCATE) &&
		    !(flags & XFS_ATTR_DMI)) {
			int dmflags = AT_DELAY_FLAG(flags) | DM_SEM_FLAG_WR;
			code = XFS_SEND_DATA(mp, DM_EVENT_TRUNCATE, ip,
				iattr->ia_size, 0, dmflags, NULL);
			if (code) {
				lock_flags = 0;
				goto error_return;
			}
		}
		if (need_iolock)
			lock_flags |= XFS_IOLOCK_EXCL;
	}

	xfs_ilock(ip, lock_flags);

	/*
	 * 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_UQUOTA_ON(mp) && iuid != uid) ||
		    (XFS_IS_GQUOTA_ON(mp) && igid != gid)) {
			ASSERT(tp);
			code = XFS_QM_DQVOPCHOWNRESV(mp, tp, ip, udqp, gdqp,
						capable(CAP_FOWNER) ?
						XFS_QMOPT_FORCE_RES : 0);
			if (code)	/* out of quota */
				goto error_return;
		}
	}

	/*
	 * Truncate file.  Must have write permission and not be a directory.
	 */
	if (mask & ATTR_SIZE) {
		/* Short circuit the truncate case for zero length files */
		if (iattr->ia_size == 0 &&
		    ip->i_size == 0 && ip->i_d.di_nextents == 0) {
			xfs_iunlock(ip, XFS_ILOCK_EXCL);
			lock_flags &= ~XFS_ILOCK_EXCL;
			if (mask & ATTR_CTIME)
				xfs_ichgtime(ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
			code = 0;
			goto error_return;
		}

		if (S_ISDIR(ip->i_d.di_mode)) {
			code = XFS_ERROR(EISDIR);
			goto error_return;
		} else if (!S_ISREG(ip->i_d.di_mode)) {
			code = XFS_ERROR(EINVAL);
			goto error_return;
		}

		/*
		 * Make sure that the dquots are attached to the inode.
		 */
		code = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED);
		if (code)
			goto error_return;

		/*
		 * Now we can make the changes.  Before we join the inode
		 * to the transaction, if ATTR_SIZE is set then 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 the i_size.
			 */
			code = xfs_zero_eof(ip, iattr->ia_size, ip->i_size);
		}
		xfs_iunlock(ip, 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 (!code &&
		    ip->i_size != ip->i_d.di_size &&
		    iattr->ia_size > ip->i_d.di_size) {
			code = xfs_flush_pages(ip,
					ip->i_d.di_size, iattr->ia_size,
					XFS_B_ASYNC, FI_NONE);
		}

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

		if (!code)
			code = xfs_itruncate_data(ip, iattr->ia_size);
		if (code) {
			ASSERT(tp == NULL);
			lock_flags &= ~XFS_ILOCK_EXCL;
			ASSERT(lock_flags == XFS_IOLOCK_EXCL);
			goto error_return;
		}
		tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE);
		if ((code = xfs_trans_reserve(tp, 0,
					     XFS_ITRUNCATE_LOG_RES(mp), 0,
					     XFS_TRANS_PERM_LOG_RES,
					     XFS_ITRUNCATE_LOG_COUNT))) {
			xfs_trans_cancel(tp, 0);
			if (need_iolock)
				xfs_iunlock(ip, XFS_IOLOCK_EXCL);
			return code;
		}
		commit_flags = XFS_TRANS_RELEASE_LOG_RES;
		xfs_ilock(ip, XFS_ILOCK_EXCL);

		xfs_trans_ijoin(tp, ip, lock_flags);
		xfs_trans_ihold(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.
		 */
		if (iattr->ia_size != ip->i_size || (mask & ATTR_CTIME))
			timeflags |= XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG;

		if (iattr->ia_size > ip->i_size) {
			ip->i_d.di_size = iattr->ia_size;
			ip->i_size = iattr->ia_size;
			if (!(flags & XFS_ATTR_DMI))
				xfs_ichgtime(ip, XFS_ICHGTIME_CHG);
			xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
		} else if (iattr->ia_size <= ip->i_size ||
			   (iattr->ia_size == 0 && ip->i_d.di_nextents)) {
			/*
			 * signal a sync transaction unless
			 * we're truncating an already unlinked
			 * file on a wsync filesystem
			 */
			code = xfs_itruncate_finish(&tp, ip, iattr->ia_size,
					    XFS_DATA_FORK,
					    ((ip->i_d.di_nlink != 0 ||
					      !(mp->m_flags & XFS_MOUNT_WSYNC))
					     ? 1 : 0));
			if (code)
				goto abort_return;
			/*
			 * Truncated "down", so we're removing references
			 * to old data here - if we now delay flushing for
			 * a long time, we expose ourselves unduly to the
			 * notorious NULL files problem.  So, we mark this
			 * vnode and flush it when the file is closed, and
			 * do not wait the usual (long) time for writeout.
			 */
			xfs_iflags_set(ip, XFS_ITRUNCATED);
		}
	} else if (tp) {
		xfs_trans_ijoin(tp, ip, lock_flags);
		xfs_trans_ihold(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_UQUOTA_ON(mp)) {
				ASSERT(mask & ATTR_UID);
				ASSERT(udqp);
				olddquot1 = XFS_QM_DQVOPCHOWN(mp, tp, ip,
							&ip->i_udquot, udqp);
			}
			ip->i_d.di_uid = uid;
			inode->i_uid = uid;
		}
		if (igid != gid) {
			if (XFS_IS_GQUOTA_ON(mp)) {
				ASSERT(!XFS_IS_PQUOTA_ON(mp));
				ASSERT(mask & ATTR_GID);
				ASSERT(gdqp);
				olddquot2 = XFS_QM_DQVOPCHOWN(mp, tp, ip,
							&ip->i_gdquot, gdqp);
			}
			ip->i_d.di_gid = gid;
			inode->i_gid = gid;
		}

		xfs_trans_log_inode (tp, ip, XFS_ILOG_CORE);
		timeflags |= XFS_ICHGTIME_CHG;
	}

	/*
	 * 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;

		xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
		timeflags |= XFS_ICHGTIME_CHG;
	}

	/*
	 * Change file access or modified times.
	 */
	if (mask & (ATTR_ATIME|ATTR_MTIME)) {
		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_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;
			timeflags &= ~XFS_ICHGTIME_MOD;
			timeflags |= XFS_ICHGTIME_CHG;
		}
		if (tp && (mask & (ATTR_MTIME_SET|ATTR_ATIME_SET)))
			xfs_trans_log_inode (tp, ip, XFS_ILOG_CORE);
	}

	/*
	 * Change file inode change time only if ATTR_CTIME set
	 * AND we have been called by a DMI function.
	 */

	if ((flags & XFS_ATTR_DMI) && (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;
		timeflags &= ~XFS_ICHGTIME_CHG;
	}

	/*
	 * Send out timestamp changes that need to be set to the
	 * current time.  Not done when called by a DMI function.
	 */
	if (timeflags && !(flags & XFS_ATTR_DMI))
		xfs_ichgtime(ip, timeflags);

	XFS_STATS_INC(xs_ig_attrchg);

	/*
	 * If this is a synchronous mount, make sure that the
	 * transaction goes to disk before returning to the user.
	 * This is slightly sub-optimal in that truncates require
	 * two sync transactions instead of one for wsync filesystems.
	 * One for the truncate and one for the timestamps since we
	 * don't want to change the timestamps unless we're sure the
	 * truncate worked.  Truncates are less than 1% of the laddis
	 * mix so this probably isn't worth the trouble to optimize.
	 */
	code = 0;
	if (tp) {
		if (mp->m_flags & XFS_MOUNT_WSYNC)
			xfs_trans_set_sync(tp);

		code = xfs_trans_commit(tp, commit_flags);
	}

	xfs_iunlock(ip, lock_flags);

	/*
	 * Release any dquot(s) the inode had kept before chown.
	 */
	XFS_QM_DQRELE(mp, olddquot1);
	XFS_QM_DQRELE(mp, olddquot2);
	XFS_QM_DQRELE(mp, udqp);
	XFS_QM_DQRELE(mp, gdqp);

	if (code) {
		return code;
	}

	if (DM_EVENT_ENABLED(ip, DM_EVENT_ATTRIBUTE) &&
	    !(flags & XFS_ATTR_DMI)) {
		(void) XFS_SEND_NAMESP(mp, DM_EVENT_ATTRIBUTE, ip, DM_RIGHT_NULL,
					NULL, DM_RIGHT_NULL, NULL, NULL,
					0, 0, AT_DELAY_FLAG(flags));
	}
	return 0;

 abort_return:
	commit_flags |= XFS_TRANS_ABORT;
	/* FALLTHROUGH */
 error_return:
	XFS_QM_DQRELE(mp, udqp);
	XFS_QM_DQRELE(mp, gdqp);
	if (tp) {
		xfs_trans_cancel(tp, commit_flags);
	}
	if (lock_flags != 0) {
		xfs_iunlock(ip, lock_flags);
	}
	return code;
}

/*
 * The maximum pathlen is 1024 bytes. Since the minimum file system
 * blocksize is 512 bytes, we can get a max of 2 extents back from
 * bmapi.
 */
#define SYMLINK_MAPS 2

STATIC int
xfs_readlink_bmap(
	xfs_inode_t	*ip,
	char		*link)
{
	xfs_mount_t	*mp = ip->i_mount;
	int		pathlen = ip->i_d.di_size;
	int             nmaps = SYMLINK_MAPS;
	xfs_bmbt_irec_t mval[SYMLINK_MAPS];
	xfs_daddr_t	d;
	int		byte_cnt;
	int		n;
	xfs_buf_t	*bp;
	int		error = 0;

	error = xfs_bmapi(NULL, ip, 0, XFS_B_TO_FSB(mp, pathlen), 0, NULL, 0,
			mval, &nmaps, NULL, NULL);
	if (error)
		goto out;

	for (n = 0; n < nmaps; n++) {
		d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
		byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);

		bp = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt), 0);
		error = XFS_BUF_GETERROR(bp);
		if (error) {
			xfs_ioerror_alert("xfs_readlink",
				  ip->i_mount, bp, XFS_BUF_ADDR(bp));
			xfs_buf_relse(bp);
			goto out;
		}
		if (pathlen < byte_cnt)
			byte_cnt = pathlen;
		pathlen -= byte_cnt;

		memcpy(link, XFS_BUF_PTR(bp), byte_cnt);
		xfs_buf_relse(bp);
	}

	link[ip->i_d.di_size] = '\0';
	error = 0;

 out:
	return error;
}

int
xfs_readlink(
	xfs_inode_t     *ip,
	char		*link)
{
	xfs_mount_t	*mp = ip->i_mount;
	int		pathlen;
	int		error = 0;

	xfs_itrace_entry(ip);

	if (XFS_FORCED_SHUTDOWN(mp))
		return XFS_ERROR(EIO);

	xfs_ilock(ip, XFS_ILOCK_SHARED);

	ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFLNK);
	ASSERT(ip->i_d.di_size <= MAXPATHLEN);

	pathlen = ip->i_d.di_size;
	if (!pathlen)
		goto out;

	if (ip->i_df.if_flags & XFS_IFINLINE) {
		memcpy(link, ip->i_df.if_u1.if_data, pathlen);
		link[pathlen] = '\0';
	} else {
		error = xfs_readlink_bmap(ip, link);
	}

 out:
	xfs_iunlock(ip, XFS_ILOCK_SHARED);
	return error;
}

/*
 * xfs_fsync
 *
 * This is called to sync the inode and its data out to disk.  We need to hold
 * the I/O lock while flushing the data, and the inode lock while flushing the
 * inode.  The inode lock CANNOT be held while flushing the data, so acquire
 * after we're done with that.
 */
int
xfs_fsync(
	xfs_inode_t	*ip)
{
	xfs_trans_t	*tp;
	int		error;
	int		log_flushed = 0, changed = 1;

	xfs_itrace_entry(ip);

	if (XFS_FORCED_SHUTDOWN(ip->i_mount))
		return XFS_ERROR(EIO);

	/* capture size updates in I/O completion before writing the inode. */
	error = xfs_wait_on_pages(ip, 0, -1);
	if (error)
		return XFS_ERROR(error);

	/*
	 * We always need to make sure that the required inode state is safe on
	 * disk.  The vnode might be clean but we still might need to force the
	 * log because of committed transactions that haven't hit the disk yet.
	 * Likewise, there could be unflushed non-transactional changes to the
	 * inode core that have to go to disk and this requires us to issue
	 * a synchronous transaction to capture these changes correctly.
	 *
	 * This code relies on the assumption that if the update_* fields
	 * of the inode are clear and the inode is unpinned then it is clean
	 * and no action is required.
	 */
	xfs_ilock(ip, XFS_ILOCK_SHARED);

	if (!(ip->i_update_size || ip->i_update_core)) {
		/*
		 * Timestamps/size haven't changed since last inode flush or
		 * inode transaction commit.  That means either nothing got
		 * written or a transaction committed which caught the updates.
		 * If the latter happened and the transaction hasn't hit the
		 * disk yet, the inode will be still be pinned.  If it is,
		 * force the log.
		 */

		xfs_iunlock(ip, XFS_ILOCK_SHARED);

		if (xfs_ipincount(ip)) {
			error = _xfs_log_force(ip->i_mount, (xfs_lsn_t)0,
				      XFS_LOG_FORCE | XFS_LOG_SYNC,
				      &log_flushed);
		} else {
			/*
			 * If the inode is not pinned and nothing has changed
			 * we don't need to flush the cache.
			 */
			changed = 0;
		}
	} else	{
		/*
		 * Kick off a transaction to log the inode core to get the
		 * updates.  The sync transaction will also force the log.
		 */
		xfs_iunlock(ip, XFS_ILOCK_SHARED);
		tp = xfs_trans_alloc(ip->i_mount, XFS_TRANS_FSYNC_TS);
		error = xfs_trans_reserve(tp, 0,
				XFS_FSYNC_TS_LOG_RES(ip->i_mount), 0, 0, 0);
		if (error) {
			xfs_trans_cancel(tp, 0);
			return error;
		}
		xfs_ilock(ip, XFS_ILOCK_EXCL);

		/*
		 * Note - it's possible that we might have pushed ourselves out
		 * of the way during trans_reserve which would flush the inode.
		 * But there's no guarantee that the inode buffer has actually
		 * gone out yet (it's delwri).	Plus the buffer could be pinned
		 * anyway if it's part of an inode in another recent
		 * transaction.	 So we play it safe and fire off the
		 * transaction anyway.
		 */
		xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
		xfs_trans_ihold(tp, ip);
		xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
		xfs_trans_set_sync(tp);
		error = _xfs_trans_commit(tp, 0, &log_flushed);

		xfs_iunlock(ip, XFS_ILOCK_EXCL);
	}

	if ((ip->i_mount->m_flags & XFS_MOUNT_BARRIER) && changed) {
		/*
		 * If the log write didn't issue an ordered tag we need
		 * to flush the disk cache for the data device now.
		 */
		if (!log_flushed)
			xfs_blkdev_issue_flush(ip->i_mount->m_ddev_targp);

		/*
		 * If this inode is on the RT dev we need to flush that
		 * cache as well.
		 */
		if (XFS_IS_REALTIME_INODE(ip))
			xfs_blkdev_issue_flush(ip->i_mount->m_rtdev_targp);
	}

	return error;
}

/*
 * This is called by xfs_inactive to free any blocks beyond eof
 * when the link count isn't zero and by xfs_dm_punch_hole() when
 * punching a hole to EOF.
 */
int
xfs_free_eofblocks(
	xfs_mount_t	*mp,
	xfs_inode_t	*ip,
	int		flags)
{
	xfs_trans_t	*tp;
	int		error;
	xfs_fileoff_t	end_fsb;
	xfs_fileoff_t	last_fsb;
	xfs_filblks_t	map_len;
	int		nimaps;
	xfs_bmbt_irec_t	imap;
	int		use_iolock = (flags & XFS_FREE_EOF_LOCK);

	/*
	 * Figure out if there are any blocks beyond the end
	 * of the file.  If not, then there is nothing to do.
	 */
	end_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)ip->i_size));
	last_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
	map_len = last_fsb - end_fsb;
	if (map_len <= 0)
		return 0;

	nimaps = 1;
	xfs_ilock(ip, XFS_ILOCK_SHARED);
	error = xfs_bmapi(NULL, ip, end_fsb, map_len, 0,
			  NULL, 0, &imap, &nimaps, NULL, NULL);
	xfs_iunlock(ip, XFS_ILOCK_SHARED);

	if (!error && (nimaps != 0) &&
	    (imap.br_startblock != HOLESTARTBLOCK ||
	     ip->i_delayed_blks)) {
		/*
		 * Attach the dquots to the inode up front.
		 */
		if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
			return error;

		/*
		 * There are blocks after the end of file.
		 * Free them up now by truncating the file to
		 * its current size.
		 */
		tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);

		/*
		 * Do the xfs_itruncate_start() call before
		 * reserving any log space because
		 * itruncate_start will call into the buffer
		 * cache and we can't
		 * do that within a transaction.
		 */
		if (use_iolock)
			xfs_ilock(ip, XFS_IOLOCK_EXCL);
		error = xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE,
				    ip->i_size);
		if (error) {
			xfs_trans_cancel(tp, 0);
			if (use_iolock)
				xfs_iunlock(ip, XFS_IOLOCK_EXCL);
			return error;
		}

		error = xfs_trans_reserve(tp, 0,
					  XFS_ITRUNCATE_LOG_RES(mp),
					  0, XFS_TRANS_PERM_LOG_RES,
					  XFS_ITRUNCATE_LOG_COUNT);
		if (error) {
			ASSERT(XFS_FORCED_SHUTDOWN(mp));
			xfs_trans_cancel(tp, 0);
			xfs_iunlock(ip, XFS_IOLOCK_EXCL);
			return error;
		}

		xfs_ilock(ip, XFS_ILOCK_EXCL);
		xfs_trans_ijoin(tp, ip,
				XFS_IOLOCK_EXCL |
				XFS_ILOCK_EXCL);
		xfs_trans_ihold(tp, ip);

		error = xfs_itruncate_finish(&tp, ip,
					     ip->i_size,
					     XFS_DATA_FORK,
					     0);
		/*
		 * If we get an error at this point we
		 * simply don't bother truncating the file.
		 */
		if (error) {
			xfs_trans_cancel(tp,
					 (XFS_TRANS_RELEASE_LOG_RES |
					  XFS_TRANS_ABORT));
		} else {
			error = xfs_trans_commit(tp,
						XFS_TRANS_RELEASE_LOG_RES);
		}
		xfs_iunlock(ip, (use_iolock ? (XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL)
					    : XFS_ILOCK_EXCL));
	}
	return error;
}

/*
 * Free a symlink that has blocks associated with it.
 */
STATIC int
xfs_inactive_symlink_rmt(
	xfs_inode_t	*ip,
	xfs_trans_t	**tpp)
{
	xfs_buf_t	*bp;
	int		committed;
	int		done;
	int		error;
	xfs_fsblock_t	first_block;
	xfs_bmap_free_t	free_list;
	int		i;
	xfs_mount_t	*mp;
	xfs_bmbt_irec_t	mval[SYMLINK_MAPS];
	int		nmaps;
	xfs_trans_t	*ntp;
	int		size;
	xfs_trans_t	*tp;

	tp = *tpp;
	mp = ip->i_mount;
	ASSERT(ip->i_d.di_size > XFS_IFORK_DSIZE(ip));
	/*
	 * We're freeing a symlink that has some
	 * blocks allocated to it.  Free the
	 * blocks here.  We know that we've got
	 * either 1 or 2 extents and that we can
	 * free them all in one bunmapi call.
	 */
	ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2);
	if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
			XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) {
		ASSERT(XFS_FORCED_SHUTDOWN(mp));
		xfs_trans_cancel(tp, 0);
		*tpp = NULL;
		return error;
	}
	/*
	 * Lock the inode, fix the size, and join it to the transaction.
	 * Hold it so in the normal path, we still have it locked for
	 * the second transaction.  In the error paths we need it
	 * held so the cancel won't rele it, see below.
	 */
	xfs_ilock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
	size = (int)ip->i_d.di_size;
	ip->i_d.di_size = 0;
	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
	xfs_trans_ihold(tp, ip);
	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
	/*
	 * Find the block(s) so we can inval and unmap them.
	 */
	done = 0;
	xfs_bmap_init(&free_list, &first_block);
	nmaps = ARRAY_SIZE(mval);
	if ((error = xfs_bmapi(tp, ip, 0, XFS_B_TO_FSB(mp, size),
			XFS_BMAPI_METADATA, &first_block, 0, mval, &nmaps,
			&free_list, NULL)))
		goto error0;
	/*
	 * Invalidate the block(s).
	 */
	for (i = 0; i < nmaps; i++) {
		bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
			XFS_FSB_TO_DADDR(mp, mval[i].br_startblock),
			XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0);
		xfs_trans_binval(tp, bp);
	}
	/*
	 * Unmap the dead block(s) to the free_list.
	 */
	if ((error = xfs_bunmapi(tp, ip, 0, size, XFS_BMAPI_METADATA, nmaps,
			&first_block, &free_list, NULL, &done)))
		goto error1;
	ASSERT(done);
	/*
	 * Commit the first transaction.  This logs the EFI and the inode.
	 */
	if ((error = xfs_bmap_finish(&tp, &free_list, &committed)))
		goto error1;
	/*
	 * The transaction must have been committed, since there were
	 * actually extents freed by xfs_bunmapi.  See xfs_bmap_finish.
	 * The new tp has the extent freeing and EFDs.
	 */
	ASSERT(committed);
	/*
	 * The first xact was committed, so add the inode to the new one.
	 * Mark it dirty so it will be logged and moved forward in the log as
	 * part of every commit.
	 */
	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
	xfs_trans_ihold(tp, ip);
	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
	/*
	 * Get a new, empty transaction to return to our caller.
	 */
	ntp = xfs_trans_dup(tp);
	/*
	 * Commit the transaction containing extent freeing and EFDs.
	 * If we get an error on the commit here or on the reserve below,
	 * we need to unlock the inode since the new transaction doesn't
	 * have the inode attached.
	 */
	error = xfs_trans_commit(tp, 0);
	tp = ntp;
	if (error) {
		ASSERT(XFS_FORCED_SHUTDOWN(mp));
		goto error0;
	}
	/*
	 * transaction commit worked ok so we can drop the extra ticket
	 * reference that we gained in xfs_trans_dup()
	 */
	xfs_log_ticket_put(tp->t_ticket);

	/*
	 * Remove the memory for extent descriptions (just bookkeeping).
	 */
	if (ip->i_df.if_bytes)
		xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK);
	ASSERT(ip->i_df.if_bytes == 0);
	/*
	 * Put an itruncate log reservation in the new transaction
	 * for our caller.
	 */
	if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
			XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) {
		ASSERT(XFS_FORCED_SHUTDOWN(mp));
		goto error0;
	}
	/*
	 * Return with the inode locked but not joined to the transaction.
	 */
	*tpp = tp;
	return 0;

 error1:
	xfs_bmap_cancel(&free_list);
 error0:
	/*
	 * Have to come here with the inode locked and either
	 * (held and in the transaction) or (not in the transaction).
	 * If the inode isn't held then cancel would iput it, but
	 * that's wrong since this is inactive and the vnode ref
	 * count is 0 already.
	 * Cancel won't do anything to the inode if held, but it still
	 * needs to be locked until the cancel is done, if it was
	 * joined to the transaction.
	 */
	xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
	xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
	*tpp = NULL;
	return error;

}

STATIC int
xfs_inactive_symlink_local(
	xfs_inode_t	*ip,
	xfs_trans_t	**tpp)
{
	int		error;

	ASSERT(ip->i_d.di_size <= XFS_IFORK_DSIZE(ip));
	/*
	 * We're freeing a symlink which fit into
	 * the inode.  Just free the memory used
	 * to hold the old symlink.
	 */
	error = xfs_trans_reserve(*tpp, 0,
				  XFS_ITRUNCATE_LOG_RES(ip->i_mount),
				  0, XFS_TRANS_PERM_LOG_RES,
				  XFS_ITRUNCATE_LOG_COUNT);

	if (error) {
		xfs_trans_cancel(*tpp, 0);
		*tpp = NULL;
		return error;
	}
	xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);

	/*
	 * Zero length symlinks _can_ exist.
	 */
	if (ip->i_df.if_bytes > 0) {
		xfs_idata_realloc(ip,
				  -(ip->i_df.if_bytes),
				  XFS_DATA_FORK);
		ASSERT(ip->i_df.if_bytes == 0);
	}
	return 0;
}

STATIC int
xfs_inactive_attrs(
	xfs_inode_t	*ip,
	xfs_trans_t	**tpp)
{
	xfs_trans_t	*tp;
	int		error;
	xfs_mount_t	*mp;

	ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
	tp = *tpp;
	mp = ip->i_mount;
	ASSERT(ip->i_d.di_forkoff != 0);
	error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	if (error)
		goto error_unlock;

	error = xfs_attr_inactive(ip);
	if (error)
		goto error_unlock;

	tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
	error = xfs_trans_reserve(tp, 0,
				  XFS_IFREE_LOG_RES(mp),
				  0, XFS_TRANS_PERM_LOG_RES,
				  XFS_INACTIVE_LOG_COUNT);
	if (error)
		goto error_cancel;

	xfs_ilock(ip, XFS_ILOCK_EXCL);
	xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
	xfs_trans_ihold(tp, ip);
	xfs_idestroy_fork(ip, XFS_ATTR_FORK);

	ASSERT(ip->i_d.di_anextents == 0);

	*tpp = tp;
	return 0;

error_cancel:
	ASSERT(XFS_FORCED_SHUTDOWN(mp));
	xfs_trans_cancel(tp, 0);
error_unlock:
	*tpp = NULL;
	xfs_iunlock(ip, XFS_IOLOCK_EXCL);
	return error;
}

int
xfs_release(
	xfs_inode_t	*ip)
{
	xfs_mount_t	*mp = ip->i_mount;
	int		error;

	if (!S_ISREG(ip->i_d.di_mode) || (ip->i_d.di_mode == 0))
		return 0;

	/* If this is a read-only mount, don't do this (would generate I/O) */
	if (mp->m_flags & XFS_MOUNT_RDONLY)
		return 0;

	if (!XFS_FORCED_SHUTDOWN(mp)) {
		int truncated;

		/*
		 * If we are using filestreams, and we have an unlinked
		 * file that we are processing the last close on, then nothing
		 * will be able to reopen and write to this file. Purge this