Commit message: xfs: fix up non-directory creation in SGID directories

XFS always inherits the SGID bit if it is set on the parent inode, while
the generic inode_init_owner does not do this in a few cases where it can
create a possible security problem, see commit 0fa3ecd87848
("Fix up non-directory creation in SGID directories") for details.

Switch XFS to use the generic helper for the normal path to fix this,
just keeping the simple field inheritance open coded for the case of the
non-sgid case with the bsdgrpid mount option.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Reported-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
CVE: None
Vulnerability description: None

Project: linux

xfs_iunlink_map_ino(
	struct xfs_trans	*tp,
	xfs_agnumber_t		agno,
	xfs_agino_t		agino,
	struct xfs_imap		*imap,
	struct xfs_dinode	**dipp,
	struct xfs_buf		**bpp)
{
	struct xfs_mount	*mp = tp->t_mountp;
	int			error;

	imap->im_blkno = 0;
	error = xfs_imap(mp, tp, XFS_AGINO_TO_INO(mp, agno, agino), imap, 0);
	if (error) {
		xfs_warn(mp, "%s: xfs_imap returned error %d.",
				__func__, error);
		return error;
	}

	error = xfs_imap_to_bp(mp, tp, imap, dipp, bpp, 0);
	if (error) {
		xfs_warn(mp, "%s: xfs_imap_to_bp returned error %d.",
				__func__, error);
		return error;
	}

	return 0;
}

Project: linux

xfs_inactive_truncate(
	struct xfs_inode *ip)
{
	struct xfs_mount	*mp = ip->i_mount;
	struct xfs_trans	*tp;
	int			error;

	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
	if (error) {
		ASSERT(XFS_FORCED_SHUTDOWN(mp));
		return error;
	}
	xfs_ilock(ip, XFS_ILOCK_EXCL);
	xfs_trans_ijoin(tp, ip, 0);

	/*
	 * Log the inode size first to prevent stale data exposure in the event
	 * of a system crash before the truncate completes. See the related
	 * comment in xfs_vn_setattr_size() for details.
	 */
	ip->i_d.di_size = 0;
	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);

	error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, 0);
	if (error)
		goto error_trans_cancel;

	ASSERT(ip->i_df.if_nextents == 0);

	error = xfs_trans_commit(tp);
	if (error)
		goto error_unlock;

	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	return 0;

error_trans_cancel:
	xfs_trans_cancel(tp);
error_unlock:
	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	return error;
}

Project: linux

xfs_inode_inherit_flags(
	struct xfs_inode	*ip,
	const struct xfs_inode	*pip)
{
	unsigned int		di_flags = 0;
	umode_t			mode = VFS_I(ip)->i_mode;

	if (S_ISDIR(mode)) {
		if (pip->i_d.di_flags & XFS_DIFLAG_RTINHERIT)
			di_flags |= XFS_DIFLAG_RTINHERIT;
		if (pip->i_d.di_flags & XFS_DIFLAG_EXTSZINHERIT) {
			di_flags |= XFS_DIFLAG_EXTSZINHERIT;
			ip->i_d.di_extsize = pip->i_d.di_extsize;
		}
		if (pip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
			di_flags |= XFS_DIFLAG_PROJINHERIT;
	} else if (S_ISREG(mode)) {
		if ((pip->i_d.di_flags & XFS_DIFLAG_RTINHERIT) &&
		    xfs_sb_version_hasrealtime(&ip->i_mount->m_sb))
			di_flags |= XFS_DIFLAG_REALTIME;
		if (pip->i_d.di_flags & XFS_DIFLAG_EXTSZINHERIT) {
			di_flags |= XFS_DIFLAG_EXTSIZE;
			ip->i_d.di_extsize = pip->i_d.di_extsize;
		}
	}
	if ((pip->i_d.di_flags & XFS_DIFLAG_NOATIME) &&
	    xfs_inherit_noatime)
		di_flags |= XFS_DIFLAG_NOATIME;
	if ((pip->i_d.di_flags & XFS_DIFLAG_NODUMP) &&
	    xfs_inherit_nodump)
		di_flags |= XFS_DIFLAG_NODUMP;
	if ((pip->i_d.di_flags & XFS_DIFLAG_SYNC) &&
	    xfs_inherit_sync)
		di_flags |= XFS_DIFLAG_SYNC;
	if ((pip->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) &&
	    xfs_inherit_nosymlinks)
		di_flags |= XFS_DIFLAG_NOSYMLINKS;
	if ((pip->i_d.di_flags & XFS_DIFLAG_NODEFRAG) &&
	    xfs_inherit_nodefrag)
		di_flags |= XFS_DIFLAG_NODEFRAG;
	if (pip->i_d.di_flags & XFS_DIFLAG_FILESTREAM)
		di_flags |= XFS_DIFLAG_FILESTREAM;

	ip->i_d.di_flags |= di_flags;
}

Project: linux

xfs_inode_inherit_flags2(
	struct xfs_inode	*ip,
	const struct xfs_inode	*pip)
{
	if (pip->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE) {
		ip->i_d.di_flags2 |= XFS_DIFLAG2_COWEXTSIZE;
		ip->i_d.di_cowextsize = pip->i_d.di_cowextsize;
	}
	if (pip->i_d.di_flags2 & XFS_DIFLAG2_DAX)
		ip->i_d.di_flags2 |= XFS_DIFLAG2_DAX;
}

Project: linux

xfs_link(
	xfs_inode_t		*tdp,
	xfs_inode_t		*sip,
	struct xfs_name		*target_name)
{
	xfs_mount_t		*mp = tdp->i_mount;
	xfs_trans_t		*tp;
	int			error;
	int			resblks;

	trace_xfs_link(tdp, target_name);

	ASSERT(!S_ISDIR(VFS_I(sip)->i_mode));

	if (XFS_FORCED_SHUTDOWN(mp))
		return -EIO;

	error = xfs_qm_dqattach(sip);
	if (error)
		goto std_return;

	error = xfs_qm_dqattach(tdp);
	if (error)
		goto std_return;

	resblks = XFS_LINK_SPACE_RES(mp, target_name->len);
	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_link, resblks, 0, 0, &tp);
	if (error == -ENOSPC) {
		resblks = 0;
		error = xfs_trans_alloc(mp, &M_RES(mp)->tr_link, 0, 0, 0, &tp);
	}
	if (error)
		goto std_return;

	xfs_lock_two_inodes(sip, XFS_ILOCK_EXCL, tdp, XFS_ILOCK_EXCL);

	xfs_trans_ijoin(tp, sip, XFS_ILOCK_EXCL);
	xfs_trans_ijoin(tp, tdp, XFS_ILOCK_EXCL);

	error = xfs_iext_count_may_overflow(tdp, XFS_DATA_FORK,
			XFS_IEXT_DIR_MANIP_CNT(mp));
	if (error)
		goto error_return;

	/*
	 * If we are using project inheritance, we only allow hard link
	 * creation in our tree when the project IDs are the same; else
	 * the tree quota mechanism could be circumvented.
	 */
	if (unlikely((tdp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
		     tdp->i_d.di_projid != sip->i_d.di_projid)) {
		error = -EXDEV;
		goto error_return;
	}

	if (!resblks) {
		error = xfs_dir_canenter(tp, tdp, target_name);
		if (error)
			goto error_return;
	}

	/*
	 * Handle initial link state of O_TMPFILE inode
	 */
	if (VFS_I(sip)->i_nlink == 0) {
		error = xfs_iunlink_remove(tp, sip);
		if (error)
			goto error_return;
	}

	error = xfs_dir_createname(tp, tdp, target_name, sip->i_ino,
				   resblks);
	if (error)
		goto error_return;
	xfs_trans_ichgtime(tp, tdp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
	xfs_trans_log_inode(tp, tdp, XFS_ILOG_CORE);

	xfs_bumplink(tp, sip);

	/*
	 * If this is a synchronous mount, make sure that the
	 * link transaction goes to disk before returning to
	 * the user.
	 */
	if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
		xfs_trans_set_sync(tp);

	return xfs_trans_commit(tp);

 error_return:
	xfs_trans_cancel(tp);
 std_return:
	return error;
}

Project: linux

xfs_iunlink_map_prev(
	struct xfs_trans	*tp,
	xfs_agnumber_t		agno,
	xfs_agino_t		head_agino,
	xfs_agino_t		target_agino,
	xfs_agino_t		*agino,
	struct xfs_imap		*imap,
	struct xfs_dinode	**dipp,
	struct xfs_buf		**bpp,
	struct xfs_perag	*pag)
{
	struct xfs_mount	*mp = tp->t_mountp;
	xfs_agino_t		next_agino;
	int			error;

	ASSERT(head_agino != target_agino);
	*bpp = NULL;

	/* See if our backref cache can find it faster. */
	*agino = xfs_iunlink_lookup_backref(pag, target_agino);
	if (*agino != NULLAGINO) {
		error = xfs_iunlink_map_ino(tp, agno, *agino, imap, dipp, bpp);
		if (error)
			return error;

		if (be32_to_cpu((*dipp)->di_next_unlinked) == target_agino)
			return 0;

		/*
		 * If we get here the cache contents were corrupt, so drop the
		 * buffer and fall back to walking the bucket list.
		 */
		xfs_trans_brelse(tp, *bpp);
		*bpp = NULL;
		WARN_ON_ONCE(1);
	}

	trace_xfs_iunlink_map_prev_fallback(mp, agno);

	/* Otherwise, walk the entire bucket until we find it. */
	next_agino = head_agino;
	while (next_agino != target_agino) {
		xfs_agino_t	unlinked_agino;

		if (*bpp)
			xfs_trans_brelse(tp, *bpp);

		*agino = next_agino;
		error = xfs_iunlink_map_ino(tp, agno, next_agino, imap, dipp,
				bpp);
		if (error)
			return error;

		unlinked_agino = be32_to_cpu((*dipp)->di_next_unlinked);
		/*
		 * Make sure this pointer is valid and isn't an obvious
		 * infinite loop.
		 */
		if (!xfs_verify_agino(mp, agno, unlinked_agino) ||
		    next_agino == unlinked_agino) {
			XFS_CORRUPTION_ERROR(__func__,
					XFS_ERRLEVEL_LOW, mp,
					*dipp, sizeof(**dipp));
			error = -EFSCORRUPTED;
			return error;
		}
		next_agino = unlinked_agino;
	}

	return 0;
}

Project: linux

xfs_dir_ialloc(
	struct xfs_trans	**tpp,
	struct xfs_inode	*dp,
	umode_t			mode,
	xfs_nlink_t		nlink,
	dev_t			rdev,
	prid_t			prid,
	struct xfs_inode	**ipp)
{
	struct xfs_buf		*agibp;
	xfs_ino_t		parent_ino = dp ? dp->i_ino : 0;
	xfs_ino_t		ino;
	int			error;

	ASSERT((*tpp)->t_flags & XFS_TRANS_PERM_LOG_RES);

	/*
	 * Call the space management code to pick the on-disk inode to be
	 * allocated.
	 */
	error = xfs_dialloc_select_ag(tpp, parent_ino, mode, &agibp);
	if (error)
		return error;

	if (!agibp)
		return -ENOSPC;

	/* Allocate an inode from the selected AG */
	error = xfs_dialloc_ag(*tpp, agibp, parent_ino, &ino);
	if (error)
		return error;
	ASSERT(ino != NULLFSINO);

	return xfs_init_new_inode(*tpp, dp, ino, mode, nlink, rdev, prid, ipp);
}

Project: linux

xfs_iunlink_add_backref(
	struct xfs_perag	*pag,
	xfs_agino_t		prev_agino,
	xfs_agino_t		this_agino)
{
	struct xfs_iunlink	*iu;

	if (XFS_TEST_ERROR(false, pag->pag_mount, XFS_ERRTAG_IUNLINK_FALLBACK))
		return 0;

	iu = kmem_zalloc(sizeof(*iu), KM_NOFS);
	iu->iu_agino = prev_agino;
	iu->iu_next_unlinked = this_agino;

	return xfs_iunlink_insert_backref(pag, iu);
}

Project: linux

xfs_ifree_cluster(
	struct xfs_inode	*free_ip,
	struct xfs_trans	*tp,
	struct xfs_icluster	*xic)
{
	struct xfs_mount	*mp = free_ip->i_mount;
	struct xfs_ino_geometry	*igeo = M_IGEO(mp);
	struct xfs_buf		*bp;
	xfs_daddr_t		blkno;
	xfs_ino_t		inum = xic->first_ino;
	int			nbufs;
	int			i, j;
	int			ioffset;
	int			error;

	nbufs = igeo->ialloc_blks / igeo->blocks_per_cluster;

	for (j = 0; j < nbufs; j++, inum += igeo->inodes_per_cluster) {
		/*
		 * The allocation bitmap tells us which inodes of the chunk were
		 * physically allocated. Skip the cluster if an inode falls into
		 * a sparse region.
		 */
		ioffset = inum - xic->first_ino;
		if ((xic->alloc & XFS_INOBT_MASK(ioffset)) == 0) {
			ASSERT(ioffset % igeo->inodes_per_cluster == 0);
			continue;
		}

		blkno = XFS_AGB_TO_DADDR(mp, XFS_INO_TO_AGNO(mp, inum),
					 XFS_INO_TO_AGBNO(mp, inum));

		/*
		 * We obtain and lock the backing buffer first in the process
		 * here to ensure dirty inodes attached to the buffer remain in
		 * the flushing state while we mark them stale.
		 *
		 * If we scan the in-memory inodes first, then buffer IO can
		 * complete before we get a lock on it, and hence we may fail
		 * to mark all the active inodes on the buffer stale.
		 */
		error = xfs_trans_get_buf(tp, mp->m_ddev_targp, blkno,
				mp->m_bsize * igeo->blocks_per_cluster,
				XBF_UNMAPPED, &bp);
		if (error)
			return error;

		/*
		 * This buffer may not have been correctly initialised as we
		 * didn't read it from disk. That's not important because we are
		 * only using to mark the buffer as stale in the log, and to
		 * attach stale cached inodes on it. That means it will never be
		 * dispatched for IO. If it is, we want to know about it, and we
		 * want it to fail. We can acheive this by adding a write
		 * verifier to the buffer.
		 */
		bp->b_ops = &xfs_inode_buf_ops;

		/*
		 * Now we need to set all the cached clean inodes as XFS_ISTALE,
		 * too. This requires lookups, and will skip inodes that we've
		 * already marked XFS_ISTALE.
		 */
		for (i = 0; i < igeo->inodes_per_cluster; i++)
			xfs_ifree_mark_inode_stale(bp, free_ip, inum + i);

		xfs_trans_stale_inode_buf(tp, bp);
		xfs_trans_binval(tp, bp);
	}
	return 0;
}

Project: linux

xfs_ilock(
	xfs_inode_t		*ip,
	uint			lock_flags)
{
	trace_xfs_ilock(ip, lock_flags, _RET_IP_);

	/*
	 * You can't set both SHARED and EXCL for the same lock,
	 * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
	 * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
	 */
	ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
	       (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
	ASSERT((lock_flags & (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL)) !=
	       (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL));
	ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
	       (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
	ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_SUBCLASS_MASK)) == 0);

	if (lock_flags & XFS_IOLOCK_EXCL) {
		down_write_nested(&VFS_I(ip)->i_rwsem,
				  XFS_IOLOCK_DEP(lock_flags));
	} else if (lock_flags & XFS_IOLOCK_SHARED) {
		down_read_nested(&VFS_I(ip)->i_rwsem,
				 XFS_IOLOCK_DEP(lock_flags));
	}

	if (lock_flags & XFS_MMAPLOCK_EXCL)
		mrupdate_nested(&ip->i_mmaplock, XFS_MMAPLOCK_DEP(lock_flags));
	else if (lock_flags & XFS_MMAPLOCK_SHARED)
		mraccess_nested(&ip->i_mmaplock, XFS_MMAPLOCK_DEP(lock_flags));

	if (lock_flags & XFS_ILOCK_EXCL)
		mrupdate_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags));
	else if (lock_flags & XFS_ILOCK_SHARED)
		mraccess_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags));
}

Project: linux

xfs_iunpin(
	struct xfs_inode	*ip)
{
	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));

	trace_xfs_inode_unpin_nowait(ip, _RET_IP_);

	/* Give the log a push to start the unpinning I/O */
	xfs_log_force_lsn(ip->i_mount, ip->i_itemp->ili_last_lsn, 0, NULL);

}

Project: linux

xfs_ilock_attr_map_shared(
	struct xfs_inode	*ip)
{
	uint			lock_mode = XFS_ILOCK_SHARED;

	if (ip->i_afp &&
	    ip->i_afp->if_format == XFS_DINODE_FMT_BTREE &&
	    (ip->i_afp->if_flags & XFS_IFEXTENTS) == 0)
		lock_mode = XFS_ILOCK_EXCL;
	xfs_ilock(ip, lock_mode);
	return lock_mode;
}

Project: linux

xfs_irele(
	struct xfs_inode	*ip)
{
	trace_xfs_irele(ip, _RET_IP_);
	iput(VFS_I(ip));
}

Project: linux

xfs_ifree_mark_inode_stale(
	struct xfs_buf		*bp,
	struct xfs_inode	*free_ip,
	xfs_ino_t		inum)
{
	struct xfs_mount	*mp = bp->b_mount;
	struct xfs_perag	*pag = bp->b_pag;
	struct xfs_inode_log_item *iip;
	struct xfs_inode	*ip;

retry:
	rcu_read_lock();
	ip = radix_tree_lookup(&pag->pag_ici_root, XFS_INO_TO_AGINO(mp, inum));

	/* Inode not in memory, nothing to do */
	if (!ip) {
		rcu_read_unlock();
		return;
	}

	/*
	 * because this is an RCU protected lookup, we could find a recently
	 * freed or even reallocated inode during the lookup. We need to check
	 * under the i_flags_lock for a valid inode here. Skip it if it is not
	 * valid, the wrong inode or stale.
	 */
	spin_lock(&ip->i_flags_lock);
	if (ip->i_ino != inum || __xfs_iflags_test(ip, XFS_ISTALE))
		goto out_iflags_unlock;

	/*
	 * Don't try to lock/unlock the current inode, but we _cannot_ skip the
	 * other inodes that we did not find in the list attached to the buffer
	 * and are not already marked stale. If we can't lock it, back off and
	 * retry.
	 */
	if (ip != free_ip) {
		if (!xfs_ilock_nowait(ip, XFS_ILOCK_EXCL)) {
			spin_unlock(&ip->i_flags_lock);
			rcu_read_unlock();
			delay(1);
			goto retry;
		}
	}
	ip->i_flags |= XFS_ISTALE;

	/*
	 * If the inode is flushing, it is already attached to the buffer.  All
	 * we needed to do here is mark the inode stale so buffer IO completion
	 * will remove it from the AIL.
	 */
	iip = ip->i_itemp;
	if (__xfs_iflags_test(ip, XFS_IFLUSHING)) {
		ASSERT(!list_empty(&iip->ili_item.li_bio_list));
		ASSERT(iip->ili_last_fields);
		goto out_iunlock;
	}

	/*
	 * Inodes not attached to the buffer can be released immediately.
	 * Everything else has to go through xfs_iflush_abort() on journal
	 * commit as the flock synchronises removal of the inode from the
	 * cluster buffer against inode reclaim.
	 */
	if (!iip || list_empty(&iip->ili_item.li_bio_list))
		goto out_iunlock;

	__xfs_iflags_set(ip, XFS_IFLUSHING);
	spin_unlock(&ip->i_flags_lock);
	rcu_read_unlock();

	/* we have a dirty inode in memory that has not yet been flushed. */
	spin_lock(&iip->ili_lock);
	iip->ili_last_fields = iip->ili_fields;
	iip->ili_fields = 0;
	iip->ili_fsync_fields = 0;
	spin_unlock(&iip->ili_lock);
	ASSERT(iip->ili_last_fields);

	if (ip != free_ip)
		xfs_iunlock(ip, XFS_ILOCK_EXCL);
	return;

out_iunlock:
	if (ip != free_ip)
		xfs_iunlock(ip, XFS_ILOCK_EXCL);
out_iflags_unlock:
	spin_unlock(&ip->i_flags_lock);
	rcu_read_unlock();
}

Project: linux

__xfs_iunpin_wait(
	struct xfs_inode	*ip)
{
	wait_queue_head_t *wq = bit_waitqueue(&ip->i_flags, __XFS_IPINNED_BIT);
	DEFINE_WAIT_BIT(wait, &ip->i_flags, __XFS_IPINNED_BIT);

	xfs_iunpin(ip);

	do {
		prepare_to_wait(wq, &wait.wq_entry, TASK_UNINTERRUPTIBLE);
		if (xfs_ipincount(ip))
			io_schedule();
	} while (xfs_ipincount(ip));
	finish_wait(wq, &wait.wq_entry);
}

Project: linux

xfs_ilock2_io_mmap(
	struct xfs_inode	*ip1,
	struct xfs_inode	*ip2)
{
	int			ret;

	ret = xfs_iolock_two_inodes_and_break_layout(VFS_I(ip1), VFS_I(ip2));
	if (ret)
		return ret;
	if (ip1 == ip2)
		xfs_ilock(ip1, XFS_MMAPLOCK_EXCL);
	else
		xfs_lock_two_inodes(ip1, XFS_MMAPLOCK_EXCL,
				    ip2, XFS_MMAPLOCK_EXCL);
	return 0;
}

Project: linux

xfs_iunlink_update_dinode(
	struct xfs_trans	*tp,
	xfs_agnumber_t		agno,
	xfs_agino_t		agino,
	struct xfs_buf		*ibp,
	struct xfs_dinode	*dip,
	struct xfs_imap		*imap,
	xfs_agino_t		next_agino)
{
	struct xfs_mount	*mp = tp->t_mountp;
	int			offset;

	ASSERT(xfs_verify_agino_or_null(mp, agno, next_agino));

	trace_xfs_iunlink_update_dinode(mp, agno, agino,
			be32_to_cpu(dip->di_next_unlinked), next_agino);

	dip->di_next_unlinked = cpu_to_be32(next_agino);
	offset = imap->im_boffset +
			offsetof(struct xfs_dinode, di_next_unlinked);

	/* need to recalc the inode CRC if appropriate */
	xfs_dinode_calc_crc(mp, dip);
	xfs_trans_inode_buf(tp, ibp);
	xfs_trans_log_buf(tp, ibp, offset, offset + sizeof(xfs_agino_t) - 1);
}

Project: linux

xfs_itruncate_extents_flags(
	struct xfs_trans	**tpp,
	struct xfs_inode	*ip,
	int			whichfork,
	xfs_fsize_t		new_size,
	int			flags)
{
	struct xfs_mount	*mp = ip->i_mount;
	struct xfs_trans	*tp = *tpp;
	xfs_fileoff_t		first_unmap_block;
	xfs_filblks_t		unmap_len;
	int			error = 0;

	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
	ASSERT(!atomic_read(&VFS_I(ip)->i_count) ||
	       xfs_isilocked(ip, XFS_IOLOCK_EXCL));
	ASSERT(new_size <= XFS_ISIZE(ip));
	ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
	ASSERT(ip->i_itemp != NULL);
	ASSERT(ip->i_itemp->ili_lock_flags == 0);
	ASSERT(!XFS_NOT_DQATTACHED(mp, ip));

	trace_xfs_itruncate_extents_start(ip, new_size);

	flags |= xfs_bmapi_aflag(whichfork);

	/*
	 * Since it is possible for space to become allocated beyond
	 * the end of the file (in a crash where the space is allocated
	 * but the inode size is not yet updated), simply remove any
	 * blocks which show up between the new EOF and the maximum
	 * possible file size.
	 *
	 * We have to free all the blocks to the bmbt maximum offset, even if
	 * the page cache can't scale that far.
	 */
	first_unmap_block = XFS_B_TO_FSB(mp, (xfs_ufsize_t)new_size);
	if (!xfs_verify_fileoff(mp, first_unmap_block)) {
		WARN_ON_ONCE(first_unmap_block > XFS_MAX_FILEOFF);
		return 0;
	}

	unmap_len = XFS_MAX_FILEOFF - first_unmap_block + 1;
	while (unmap_len > 0) {
		ASSERT(tp->t_firstblock == NULLFSBLOCK);
		error = __xfs_bunmapi(tp, ip, first_unmap_block, &unmap_len,
				flags, XFS_ITRUNC_MAX_EXTENTS);
		if (error)
			goto out;

		/* free the just unmapped extents */
		error = xfs_defer_finish(&tp);
		if (error)
			goto out;
	}

	if (whichfork == XFS_DATA_FORK) {
		/* Remove all pending CoW reservations. */
		error = xfs_reflink_cancel_cow_blocks(ip, &tp,
				first_unmap_block, XFS_MAX_FILEOFF, true);
		if (error)
			goto out;

		xfs_itruncate_clear_reflink_flags(ip);
	}

	/*
	 * Always re-log the inode so that our permanent transaction can keep
	 * on rolling it forward in the log.
	 */
	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);

	trace_xfs_itruncate_extents_end(ip, new_size);

out:
	*tpp = tp;
	return error;
}

Project: linux

xfs_iunlink_destroy(
	struct xfs_perag	*pag)
{
	bool			freed_anything = false;

	rhashtable_free_and_destroy(&pag->pagi_unlinked_hash,
			xfs_iunlink_free_item, &freed_anything);

	ASSERT(freed_anything == false || XFS_FORCED_SHUTDOWN(pag->pag_mount));
}

Project: linux

xfs_finish_rename(
	struct xfs_trans	*tp)
{
	/*
	 * If this is a synchronous mount, make sure that the rename transaction
	 * goes to disk before returning to the user.
	 */
	if (tp->t_mountp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
		xfs_trans_set_sync(tp);

	return xfs_trans_commit(tp);
}

Project: linux

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

	if (!S_ISREG(VFS_I(ip)->i_mode) || (VFS_I(ip)->i_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 previously truncated this file and removed old data
		 * in the process, we want to initiate "early" writeout on
		 * the last close.  This is an attempt to combat the notorious
		 * NULL files problem which is particularly noticeable from a
		 * truncate down, buffered (re-)write (delalloc), followed by
		 * a crash.  What we are effectively doing here is
		 * significantly reducing the time window where we'd otherwise
		 * be exposed to that problem.
		 */
		truncated = xfs_iflags_test_and_clear(ip, XFS_ITRUNCATED);
		if (truncated) {
			xfs_iflags_clear(ip, XFS_IDIRTY_RELEASE);
			if (ip->i_delayed_blks > 0) {
				error = filemap_flush(VFS_I(ip)->i_mapping);
				if (error)
					return error;
			}
		}
	}

	if (VFS_I(ip)->i_nlink == 0)
		return 0;

	if (xfs_can_free_eofblocks(ip, false)) {

		/*
		 * Check if the inode is being opened, written and closed
		 * frequently and we have delayed allocation blocks outstanding
		 * (e.g. streaming writes from the NFS server), truncating the
		 * blocks past EOF will cause fragmentation to occur.
		 *
		 * In this case don't do the truncation, but we have to be
		 * careful how we detect this case. Blocks beyond EOF show up as
		 * i_delayed_blks even when the inode is clean, so we need to
		 * truncate them away first before checking for a dirty release.
		 * Hence on the first dirty close we will still remove the
		 * speculative allocation, but after that we will leave it in
		 * place.
		 */
		if (xfs_iflags_test(ip, XFS_IDIRTY_RELEASE))
			return 0;
		/*
		 * If we can't get the iolock just skip truncating the blocks
		 * past EOF because we could deadlock with the mmap_lock
		 * otherwise. We'll get another chance to drop them once the
		 * last reference to the inode is dropped, so we'll never leak
		 * blocks permanently.
		 */
		if (xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) {
			error = xfs_free_eofblocks(ip);
			xfs_iunlock(ip, XFS_IOLOCK_EXCL);
			if (error)
				return error;
		}

		/* delalloc blocks after truncation means it really is dirty */
		if (ip->i_delayed_blks)
			xfs_iflags_set(ip, XFS_IDIRTY_RELEASE);
	}
	return 0;
}

Project: linux

xfs_iunlink(
	struct xfs_trans	*tp,
	struct xfs_inode	*ip)
{
	struct xfs_mount	*mp = tp->t_mountp;
	struct xfs_agi		*agi;
	struct xfs_buf		*agibp;
	xfs_agino_t		next_agino;
	xfs_agnumber_t		agno = XFS_INO_TO_AGNO(mp, ip->i_ino);
	xfs_agino_t		agino = XFS_INO_TO_AGINO(mp, ip->i_ino);
	short			bucket_index = agino % XFS_AGI_UNLINKED_BUCKETS;
	int			error;

	ASSERT(VFS_I(ip)->i_nlink == 0);
	ASSERT(VFS_I(ip)->i_mode != 0);
	trace_xfs_iunlink(ip);

	/* Get the agi buffer first.  It ensures lock ordering on the list. */
	error = xfs_read_agi(mp, tp, agno, &agibp);
	if (error)
		return error;
	agi = agibp->b_addr;

	/*
	 * Get the index into the agi hash table for the list this inode will
	 * go on.  Make sure the pointer isn't garbage and that this inode
	 * isn't already on the list.
	 */
	next_agino = be32_to_cpu(agi->agi_unlinked[bucket_index]);
	if (next_agino == agino ||
	    !xfs_verify_agino_or_null(mp, agno, next_agino)) {
		xfs_buf_mark_corrupt(agibp);
		return -EFSCORRUPTED;
	}

	if (next_agino != NULLAGINO) {
		xfs_agino_t		old_agino;

		/*
		 * There is already another inode in the bucket, so point this
		 * inode to the current head of the list.
		 */
		error = xfs_iunlink_update_inode(tp, ip, agno, next_agino,
				&old_agino);
		if (error)
			return error;
		ASSERT(old_agino == NULLAGINO);

		/*
		 * agino has been unlinked, add a backref from the next inode
		 * back to agino.
		 */
		error = xfs_iunlink_add_backref(agibp->b_pag, agino, next_agino);
		if (error)
			return error;
	}

	/* Point the head of the list to point to this inode. */
	return xfs_iunlink_update_bucket(tp, agno, agibp, bucket_index, agino);
}

Project: linux

xfs_iolock_two_inodes_and_break_layout(
	struct inode		*src,
	struct inode		*dest)
{
	int			error;

	if (src > dest)
		swap(src, dest);

retry:
	/* Wait to break both inodes' layouts before we start locking. */
	error = break_layout(src, true);
	if (error)
		return error;
	if (src != dest) {
		error = break_layout(dest, true);
		if (error)
			return error;
	}

	/* Lock one inode and make sure nobody got in and leased it. */
	inode_lock(src);
	error = break_layout(src, false);
	if (error) {
		inode_unlock(src);
		if (error == -EWOULDBLOCK)
			goto retry;
		return error;
	}

	if (src == dest)
		return 0;

	/* Lock the other inode and make sure nobody got in and leased it. */
	inode_lock_nested(dest, I_MUTEX_NONDIR2);
	error = break_layout(dest, false);
	if (error) {
		inode_unlock(src);
		inode_unlock(dest);
		if (error == -EWOULDBLOCK)
			goto retry;
		return error;
	}

	return 0;
}

Project: linux

xfs_init_new_inode(
	struct xfs_trans	*tp,
	struct xfs_inode	*pip,
	xfs_ino_t		ino,
	umode_t			mode,
	xfs_nlink_t		nlink,
	dev_t			rdev,
	prid_t			prid,
	struct xfs_inode	**ipp)
{
	struct inode		*dir = pip ? VFS_I(pip) : NULL;
	struct xfs_mount	*mp = tp->t_mountp;
	struct xfs_inode	*ip;
	unsigned int		flags;
	int			error;
	struct timespec64	tv;
	struct inode		*inode;

	/*
	 * Protect against obviously corrupt allocation btree records. Later
	 * xfs_iget checks will catch re-allocation of other active in-memory
	 * and on-disk inodes. If we don't catch reallocating the parent inode
	 * here we will deadlock in xfs_iget() so we have to do these checks
	 * first.
	 */
	if ((pip && ino == pip->i_ino) || !xfs_verify_dir_ino(mp, ino)) {
		xfs_alert(mp, "Allocated a known in-use inode 0x%llx!", ino);
		return -EFSCORRUPTED;
	}

	/*
	 * Get the in-core inode with the lock held exclusively to prevent
	 * others from looking at until we're done.
	 */
	error = xfs_iget(mp, tp, ino, XFS_IGET_CREATE, XFS_ILOCK_EXCL, &ip);
	if (error)
		return error;

	ASSERT(ip != NULL);
	inode = VFS_I(ip);
	set_nlink(inode, nlink);
	inode->i_rdev = rdev;
	ip->i_d.di_projid = prid;

	if (dir && !(dir->i_mode & S_ISGID) &&
	    (mp->m_flags & XFS_MOUNT_GRPID)) {
		inode->i_uid = current_fsuid();
		inode->i_gid = dir->i_gid;
		inode->i_mode = mode;
	} else {
		inode_init_owner(inode, dir, mode);
	}

	/*
	 * If the group ID of the new file does not match the effective group
	 * ID or one of the supplementary group IDs, the S_ISGID bit is cleared
	 * (and only if the irix_sgid_inherit compatibility variable is set).
	 */
	if (irix_sgid_inherit &&
	    (inode->i_mode & S_ISGID) && !in_group_p(inode->i_gid))
		inode->i_mode &= ~S_ISGID;

	ip->i_d.di_size = 0;
	ip->i_df.if_nextents = 0;
	ASSERT(ip->i_d.di_nblocks == 0);

	tv = current_time(inode);
	inode->i_mtime = tv;
	inode->i_atime = tv;
	inode->i_ctime = tv;

	ip->i_d.di_extsize = 0;
	ip->i_d.di_dmevmask = 0;
	ip->i_d.di_dmstate = 0;
	ip->i_d.di_flags = 0;

	if (xfs_sb_version_has_v3inode(&mp->m_sb)) {
		inode_set_iversion(inode, 1);
		ip->i_d.di_flags2 = mp->m_ino_geo.new_diflags2;
		ip->i_d.di_cowextsize = 0;
		ip->i_d.di_crtime = tv;
	}

	flags = XFS_ILOG_CORE;
	switch (mode & S_IFMT) {
	case S_IFIFO:
	case S_IFCHR:
	case S_IFBLK:
	case S_IFSOCK:
		ip->i_df.if_format = XFS_DINODE_FMT_DEV;
		ip->i_df.if_flags = 0;
		flags |= XFS_ILOG_DEV;
		break;
	case S_IFREG:
	case S_IFDIR:
		if (pip && (pip->i_d.di_flags & XFS_DIFLAG_ANY))
			xfs_inode_inherit_flags(ip, pip);
		if (pip && (pip->i_d.di_flags2 & XFS_DIFLAG2_ANY))
			xfs_inode_inherit_flags2(ip, pip);
		/* FALLTHROUGH */
	case S_IFLNK:
		ip->i_df.if_format = XFS_DINODE_FMT_EXTENTS;
		ip->i_df.if_flags = XFS_IFEXTENTS;
		ip->i_df.if_bytes = 0;
		ip->i_df.if_u1.if_root = NULL;
		break;
	default:
		ASSERT(0);
	}

	/*
	 * Log the new values stuffed into the inode.
	 */
	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
	xfs_trans_log_inode(tp, ip, flags);

	/* now that we have an i_mode we can setup the inode structure */
	xfs_setup_inode(ip);

	*ipp = ip;
	return 0;
}

Project: linux

xfs_remove(
	xfs_inode_t             *dp,
	struct xfs_name		*name,
	xfs_inode_t		*ip)
{
	xfs_mount_t		*mp = dp->i_mount;
	xfs_trans_t             *tp = NULL;
	int			is_dir = S_ISDIR(VFS_I(ip)->i_mode);
	int                     error = 0;
	uint			resblks;

	trace_xfs_remove(dp, name);

	if (XFS_FORCED_SHUTDOWN(mp))
		return -EIO;

	error = xfs_qm_dqattach(dp);
	if (error)
		goto std_return;

	error = xfs_qm_dqattach(ip);
	if (error)
		goto std_return;

	/*
	 * We try to get the real space reservation first,
	 * allowing for directory btree deletion(s) implying
	 * possible bmap insert(s).  If we can't get the space
	 * reservation then we use 0 instead, and avoid the bmap
	 * btree insert(s) in the directory code by, if the bmap
	 * insert tries to happen, instead trimming the LAST
	 * block from the directory.
	 */
	resblks = XFS_REMOVE_SPACE_RES(mp);
	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_remove, resblks, 0, 0, &tp);
	if (error == -ENOSPC) {
		resblks = 0;
		error = xfs_trans_alloc(mp, &M_RES(mp)->tr_remove, 0, 0, 0,
				&tp);
	}
	if (error) {
		ASSERT(error != -ENOSPC);
		goto std_return;
	}

	xfs_lock_two_inodes(dp, XFS_ILOCK_EXCL, ip, XFS_ILOCK_EXCL);

	xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);

	/*
	 * If we're removing a directory perform some additional validation.
	 */
	if (is_dir) {
		ASSERT(VFS_I(ip)->i_nlink >= 2);
		if (VFS_I(ip)->i_nlink != 2) {
			error = -ENOTEMPTY;
			goto out_trans_cancel;
		}
		if (!xfs_dir_isempty(ip)) {
			error = -ENOTEMPTY;
			goto out_trans_cancel;
		}

		/* Drop the link from ip's "..".  */
		error = xfs_droplink(tp, dp);
		if (error)
			goto out_trans_cancel;

		/* Drop the "." link from ip to self.  */
		error = xfs_droplink(tp, ip);
		if (error)
			goto out_trans_cancel;
	} else {
		/*
		 * When removing a non-directory we need to log the parent
		 * inode here.  For a directory this is done implicitly
		 * by the xfs_droplink call for the ".." entry.
		 */
		xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
	}
	xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);

	/* Drop the link from dp to ip. */
	error = xfs_droplink(tp, ip);
	if (error)
		goto out_trans_cancel;

	error = xfs_dir_removename(tp, dp, name, ip->i_ino, resblks);
	if (error) {
		ASSERT(error != -ENOENT);
		goto out_trans_cancel;
	}

	/*
	 * If this is a synchronous mount, make sure that the
	 * remove transaction goes to disk before returning to
	 * the user.
	 */
	if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
		xfs_trans_set_sync(tp);

	error = xfs_trans_commit(tp);
	if (error)
		goto std_return;

	if (is_dir && xfs_inode_is_filestream(ip))
		xfs_filestream_deassociate(ip);

	return 0;

 out_trans_cancel:
	xfs_trans_cancel(tp);
 std_return:
	return error;
}

Project: linux

xfs_ifree(
	struct xfs_trans	*tp,
	struct xfs_inode	*ip)
{
	int			error;
	struct xfs_icluster	xic = { 0 };
	struct xfs_inode_log_item *iip = ip->i_itemp;

	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
	ASSERT(VFS_I(ip)->i_nlink == 0);
	ASSERT(ip->i_df.if_nextents == 0);
	ASSERT(ip->i_d.di_size == 0 || !S_ISREG(VFS_I(ip)->i_mode));
	ASSERT(ip->i_d.di_nblocks == 0);

	/*
	 * Pull the on-disk inode from the AGI unlinked list.
	 */
	error = xfs_iunlink_remove(tp, ip);
	if (error)
		return error;

	error = xfs_difree(tp, ip->i_ino, &xic);
	if (error)
		return error;

	/*
	 * Free any local-format data sitting around before we reset the
	 * data fork to extents format.  Note that the attr fork data has
	 * already been freed by xfs_attr_inactive.
	 */
	if (ip->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
		kmem_free(ip->i_df.if_u1.if_data);
		ip->i_df.if_u1.if_data = NULL;
		ip->i_df.if_bytes = 0;
	}

	VFS_I(ip)->i_mode = 0;		/* mark incore inode as free */
	ip->i_d.di_flags = 0;
	ip->i_d.di_flags2 = ip->i_mount->m_ino_geo.new_diflags2;
	ip->i_d.di_dmevmask = 0;
	ip->i_d.di_forkoff = 0;		/* mark the attr fork not in use */
	ip->i_df.if_format = XFS_DINODE_FMT_EXTENTS;

	/* Don't attempt to replay owner changes for a deleted inode */
	spin_lock(&iip->ili_lock);
	iip->ili_fields &= ~(XFS_ILOG_AOWNER | XFS_ILOG_DOWNER);
	spin_unlock(&iip->ili_lock);

	/*
	 * Bump the generation count so no one will be confused
	 * by reincarnations of this inode.
	 */
	VFS_I(ip)->i_generation++;
	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);

	if (xic.deleted)
		error = xfs_ifree_cluster(ip, tp, &xic);

	return error;
}

Project: linux

xfs_cross_rename(
	struct xfs_trans	*tp,
	struct xfs_inode	*dp1,
	struct xfs_name		*name1,
	struct xfs_inode	*ip1,
	struct xfs_inode	*dp2,
	struct xfs_name		*name2,
	struct xfs_inode	*ip2,
	int			spaceres)
{
	int		error = 0;
	int		ip1_flags = 0;
	int		ip2_flags = 0;
	int		dp2_flags = 0;

	/* Swap inode number for dirent in first parent */
	error = xfs_dir_replace(tp, dp1, name1, ip2->i_ino, spaceres);
	if (error)
		goto out_trans_abort;

	/* Swap inode number for dirent in second parent */
	error = xfs_dir_replace(tp, dp2, name2, ip1->i_ino, spaceres);
	if (error)
		goto out_trans_abort;

	/*
	 * If we're renaming one or more directories across different parents,
	 * update the respective ".." entries (and link counts) to match the new
	 * parents.
	 */
	if (dp1 != dp2) {
		dp2_flags = XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG;

		if (S_ISDIR(VFS_I(ip2)->i_mode)) {
			error = xfs_dir_replace(tp, ip2, &xfs_name_dotdot,
						dp1->i_ino, spaceres);
			if (error)
				goto out_trans_abort;

			/* transfer ip2 ".." reference to dp1 */
			if (!S_ISDIR(VFS_I(ip1)->i_mode)) {
				error = xfs_droplink(tp, dp2);
				if (error)
					goto out_trans_abort;
				xfs_bumplink(tp, dp1);
			}

			/*
			 * Although ip1 isn't changed here, userspace needs
			 * to be warned about the change, so that applications
			 * relying on it (like backup ones), will properly
			 * notify the change
			 */
			ip1_flags |= XFS_ICHGTIME_CHG;
			ip2_flags |= XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG;
		}

		if (S_ISDIR(VFS_I(ip1)->i_mode)) {
			error = xfs_dir_replace(tp, ip1, &xfs_name_dotdot,
						dp2->i_ino, spaceres);
			if (error)
				goto out_trans_abort;

			/* transfer ip1 ".." reference to dp2 */
			if (!S_ISDIR(VFS_I(ip2)->i_mode)) {
				error = xfs_droplink(tp, dp1);
				if (error)
					goto out_trans_abort;
				xfs_bumplink(tp, dp2);
			}

			/*
			 * Although ip2 isn't changed here, userspace needs
			 * to be warned about the change, so that applications
			 * relying on it (like backup ones), will properly
			 * notify the change
			 */
			ip1_flags |= XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG;
			ip2_flags |= XFS_ICHGTIME_CHG;
		}
	}

	if (ip1_flags) {
		xfs_trans_ichgtime(tp, ip1, ip1_flags);
		xfs_trans_log_inode(tp, ip1, XFS_ILOG_CORE);
	}
	if (ip2_flags) {
		xfs_trans_ichgtime(tp, ip2, ip2_flags);
		xfs_trans_log_inode(tp, ip2, XFS_ILOG_CORE);
	}
	if (dp2_flags) {
		xfs_trans_ichgtime(tp, dp2, dp2_flags);
		xfs_trans_log_inode(tp, dp2, XFS_ILOG_CORE);
	}
	xfs_trans_ichgtime(tp, dp1, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
	xfs_trans_log_inode(tp, dp1, XFS_ILOG_CORE);
	return xfs_finish_rename(tp);

out_trans_abort:
	xfs_trans_cancel(tp);
	return error;
}

Project: linux

xfs_get_extsz_hint(
	struct xfs_inode	*ip)
{
	/*
	 * No point in aligning allocations if we need to COW to actually
	 * write to them.
	 */
	if (xfs_is_always_cow_inode(ip))
		return 0;
	if ((ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE) && ip->i_d.di_extsize)
		return ip->i_d.di_extsize;
	if (XFS_IS_REALTIME_INODE(ip))
		return ip->i_mount->m_sb.sb_rextsize;
	return 0;
}

Project: linux

_xfs_dic2xflags(
	uint16_t		di_flags,
	uint64_t		di_flags2,
	bool			has_attr)
{
	uint			flags = 0;

	if (di_flags & XFS_DIFLAG_ANY) {
		if (di_flags & XFS_DIFLAG_REALTIME)
			flags |= FS_XFLAG_REALTIME;
		if (di_flags & XFS_DIFLAG_PREALLOC)
			flags |= FS_XFLAG_PREALLOC;
		if (di_flags & XFS_DIFLAG_IMMUTABLE)
			flags |= FS_XFLAG_IMMUTABLE;
		if (di_flags & XFS_DIFLAG_APPEND)
			flags |= FS_XFLAG_APPEND;
		if (di_flags & XFS_DIFLAG_SYNC)
			flags |= FS_XFLAG_SYNC;
		if (di_flags & XFS_DIFLAG_NOATIME)
			flags |= FS_XFLAG_NOATIME;
		if (di_flags & XFS_DIFLAG_NODUMP)
			flags |= FS_XFLAG_NODUMP;
		if (di_flags & XFS_DIFLAG_RTINHERIT)
			flags |= FS_XFLAG_RTINHERIT;
		if (di_flags & XFS_DIFLAG_PROJINHERIT)
			flags |= FS_XFLAG_PROJINHERIT;
		if (di_flags & XFS_DIFLAG_NOSYMLINKS)
			flags |= FS_XFLAG_NOSYMLINKS;
		if (di_flags & XFS_DIFLAG_EXTSIZE)
			flags |= FS_XFLAG_EXTSIZE;
		if (di_flags & XFS_DIFLAG_EXTSZINHERIT)
			flags |= FS_XFLAG_EXTSZINHERIT;
		if (di_flags & XFS_DIFLAG_NODEFRAG)
			flags |= FS_XFLAG_NODEFRAG;
		if (di_flags & XFS_DIFLAG_FILESTREAM)
			flags |= FS_XFLAG_FILESTREAM;
	}

	if (di_flags2 & XFS_DIFLAG2_ANY) {
		if (di_flags2 & XFS_DIFLAG2_DAX)
			flags |= FS_XFLAG_DAX;
		if (di_flags2 & XFS_DIFLAG2_COWEXTSIZE)
			flags |= FS_XFLAG_COWEXTSIZE;
	}

	if (has_attr)
		flags |= FS_XFLAG_HASATTR;

	return flags;
}

Project: linux

xfs_iunlink_init(
	struct xfs_perag	*pag)
{
	return rhashtable_init(&pag->pagi_unlinked_hash,
			&xfs_iunlink_hash_params);
}

Project: linux

xfs_inactive(
	xfs_inode_t	*ip)
{
	struct xfs_mount	*mp;
	int			error;
	int			truncate = 0;

	/*
	 * If the inode is already free, then there can be nothing
	 * to clean up here.
	 */
	if (VFS_I(ip)->i_mode == 0) {
		ASSERT(ip->i_df.if_broot_bytes == 0);
		return;
	}

	mp = ip->i_mount;
	ASSERT(!xfs_iflags_test(ip, XFS_IRECOVERY));

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

	/* Try to clean out the cow blocks if there are any. */
	if (xfs_inode_has_cow_data(ip))
		xfs_reflink_cancel_cow_range(ip, 0, NULLFILEOFF, true);

	if (VFS_I(ip)->i_nlink != 0) {
		/*
		 * force is true because we are evicting an inode from the
		 * cache. Post-eof blocks must be freed, lest we end up with
		 * broken free space accounting.
		 *
		 * Note: don't bother with iolock here since lockdep complains
		 * about acquiring it in reclaim context. We have the only
		 * reference to the inode at this point anyways.
		 */
		if (xfs_can_free_eofblocks(ip, true))
			xfs_free_eofblocks(ip);

		return;
	}

	if (S_ISREG(VFS_I(ip)->i_mode) &&
	    (ip->i_d.di_size != 0 || XFS_ISIZE(ip) != 0 ||
	     ip->i_df.if_nextents > 0 || ip->i_delayed_blks > 0))
		truncate = 1;

	error = xfs_qm_dqattach(ip);
	if (error)
		return;

	if (S_ISLNK(VFS_I(ip)->i_mode))
		error = xfs_inactive_symlink(ip);
	else if (truncate)
		error = xfs_inactive_truncate(ip);
	if (error)
		return;

	/*
	 * If there are attributes associated with the file then blow them away
	 * now.  The code calls a routine that recursively deconstructs the
	 * attribute fork. If also blows away the in-core attribute fork.
	 */
	if (XFS_IFORK_Q(ip)) {
		error = xfs_attr_inactive(ip);
		if (error)
			return;
	}

	ASSERT(!ip->i_afp);
	ASSERT(ip->i_d.di_forkoff == 0);

	/*
	 * Free the inode.
	 */
	error = xfs_inactive_ifree(ip);
	if (error)
		return;

	/*
	 * Release the dquots held by inode, if any.
	 */
	xfs_qm_dqdetach(ip);
}

Project: linux

xfs_iunlink_free_item(
	void			*ptr,
	void			*arg)
{
	struct xfs_iunlink	*iu = ptr;
	bool			*freed_anything = arg;

	*freed_anything = true;
	kmem_free(iu);
}

Project: linux

xfs_iunlock(
	xfs_inode_t		*ip,
	uint			lock_flags)
{
	/*
	 * You can't set both SHARED and EXCL for the same lock,
	 * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
	 * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
	 */
	ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
	       (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
	ASSERT((lock_flags & (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL)) !=
	       (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL));
	ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
	       (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
	ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_SUBCLASS_MASK)) == 0);
	ASSERT(lock_flags != 0);

	if (lock_flags & XFS_IOLOCK_EXCL)
		up_write(&VFS_I(ip)->i_rwsem);
	else if (lock_flags & XFS_IOLOCK_SHARED)
		up_read(&VFS_I(ip)->i_rwsem);

	if (lock_flags & XFS_MMAPLOCK_EXCL)
		mrunlock_excl(&ip->i_mmaplock);
	else if (lock_flags & XFS_MMAPLOCK_SHARED)
		mrunlock_shared(&ip->i_mmaplock);

	if (lock_flags & XFS_ILOCK_EXCL)
		mrunlock_excl(&ip->i_lock);
	else if (lock_flags & XFS_ILOCK_SHARED)
		mrunlock_shared(&ip->i_lock);

	trace_xfs_iunlock(ip, lock_flags, _RET_IP_);
}

Project: linux

xfs_droplink(
	xfs_trans_t *tp,
	xfs_inode_t *ip)
{
	xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);

	drop_nlink(VFS_I(ip));
	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);

	if (VFS_I(ip)->i_nlink)
		return 0;

	return xfs_iunlink(tp, ip);
}

Project: linux

xfs_rename_alloc_whiteout(
	struct xfs_inode	*dp,
	struct xfs_inode	**wip)
{
	struct xfs_inode	*tmpfile;
	int			error;

	error = xfs_create_tmpfile(dp, S_IFCHR | WHITEOUT_MODE, &tmpfile);
	if (error)
		return error;

	/*
	 * Prepare the tmpfile inode as if it were created through the VFS.
	 * Complete the inode setup and flag it as linkable.  nlink is already
	 * zero, so we can skip the drop_nlink.
	 */
	xfs_setup_iops(tmpfile);
	xfs_finish_inode_setup(tmpfile);
	VFS_I(tmpfile)->i_state |= I_LINKABLE;

	*wip = tmpfile;
	return 0;
}

Project: linux

xfs_lookup(
	xfs_inode_t		*dp,
	struct xfs_name		*name,
	xfs_inode_t		**ipp,
	struct xfs_name		*ci_name)
{
	xfs_ino_t		inum;
	int			error;

	trace_xfs_lookup(dp, name);

	if (XFS_FORCED_SHUTDOWN(dp->i_mount))
		return -EIO;

	error = xfs_dir_lookup(NULL, dp, name, &inum, ci_name);
	if (error)
		goto out_unlock;

	error = xfs_iget(dp->i_mount, NULL, inum, 0, 0, ipp);
	if (error)
		goto out_free_name;

	return 0;

out_free_name:
	if (ci_name)
		kmem_free(ci_name->name);
out_unlock:
	*ipp = NULL;
	return error;
}

Project: linux

xfs_lock_inodes(
	struct xfs_inode	**ips,
	int			inodes,
	uint			lock_mode)
{
	int			attempts = 0, i, j, try_lock;
	struct xfs_log_item	*lp;

	/*
	 * Currently supports between 2 and 5 inodes with exclusive locking.  We
	 * support an arbitrary depth of locking here, but absolute limits on
	 * inodes depend on the type of locking and the limits placed by
	 * lockdep annotations in xfs_lock_inumorder.  These are all checked by
	 * the asserts.
	 */
	ASSERT(ips && inodes >= 2 && inodes <= 5);
	ASSERT(lock_mode & (XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL |
			    XFS_ILOCK_EXCL));
	ASSERT(!(lock_mode & (XFS_IOLOCK_SHARED | XFS_MMAPLOCK_SHARED |
			      XFS_ILOCK_SHARED)));
	ASSERT(!(lock_mode & XFS_MMAPLOCK_EXCL) ||
		inodes <= XFS_MMAPLOCK_MAX_SUBCLASS + 1);
	ASSERT(!(lock_mode & XFS_ILOCK_EXCL) ||
		inodes <= XFS_ILOCK_MAX_SUBCLASS + 1);

	if (lock_mode & XFS_IOLOCK_EXCL) {
		ASSERT(!(lock_mode & (XFS_MMAPLOCK_EXCL | XFS_ILOCK_EXCL)));
	} else if (lock_mode & XFS_MMAPLOCK_EXCL)
		ASSERT(!(lock_mode & XFS_ILOCK_EXCL));

	try_lock = 0;
	i = 0;
again:
	for (; i < inodes; i++) {
		ASSERT(ips[i]);

		if (i && (ips[i] == ips[i - 1]))	/* Already locked */
			continue;

		/*
		 * If try_lock is not set yet, make sure all locked inodes are
		 * not in the AIL.  If any are, set try_lock to be used later.
		 */
		if (!try_lock) {
			for (j = (i - 1); j >= 0 && !try_lock; j--) {
				lp = &ips[j]->i_itemp->ili_item;
				if (lp && test_bit(XFS_LI_IN_AIL, &lp->li_flags))
					try_lock++;
			}
		}

		/*
		 * If any of the previous locks we have locked is in the AIL,
		 * we must TRY to get the second and subsequent locks. If
		 * we can't get any, we must release all we have
		 * and try again.
		 */
		if (!try_lock) {
			xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i));
			continue;
		}

		/* try_lock means we have an inode locked that is in the AIL. */
		ASSERT(i != 0);
		if (xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i)))
			continue;

		/*
		 * Unlock all previous guys and try again.  xfs_iunlock will try
		 * to push the tail if the inode is in the AIL.
		 */
		attempts++;
		for (j = i - 1; j >= 0; j--) {
			/*
			 * Check to see if we've already unlocked this one.  Not
			 * the first one going back, and the inode ptr is the
			 * same.
			 */
			if (j != (i - 1) && ips[j] == ips[j + 1])
				continue;

			xfs_iunlock(ips[j], lock_mode);
		}

		if ((attempts % 5) == 0) {
			delay(1); /* Don't just spin the CPU */
		}
		i = 0;
		try_lock = 0;
		goto again;
	}
}

Project: linux

xfs_get_cowextsz_hint(
	struct xfs_inode	*ip)
{
	xfs_extlen_t		a, b;

	a = 0;
	if (ip->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE)
		a = ip->i_d.di_cowextsize;
	b = xfs_get_extsz_hint(ip);

	a = max(a, b);
	if (a == 0)
		return XFS_DEFAULT_COWEXTSZ_HINT;
	return a;
}

Project: linux

xfs_ilock_data_map_shared(
	struct xfs_inode	*ip)
{
	uint			lock_mode = XFS_ILOCK_SHARED;

	if (ip->i_df.if_format == XFS_DINODE_FMT_BTREE &&
	    (ip->i_df.if_flags & XFS_IFEXTENTS) == 0)
		lock_mode = XFS_ILOCK_EXCL;
	xfs_ilock(ip, lock_mode);
	return lock_mode;
}

Project: linux

xfs_bumplink(
	xfs_trans_t *tp,
	xfs_inode_t *ip)
{
	xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);

	inc_nlink(VFS_I(ip));
	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
}

Project: linux

xfs_ilock_nowait(
	xfs_inode_t		*ip,
	uint			lock_flags)
{
	trace_xfs_ilock_nowait(ip, lock_flags, _RET_IP_);

	/*
	 * You can't set both SHARED and EXCL for the same lock,
	 * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
	 * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
	 */
	ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
	       (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
	ASSERT((lock_flags & (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL)) !=
	       (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL));
	ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
	       (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
	ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_SUBCLASS_MASK)) == 0);

	if (lock_flags & XFS_IOLOCK_EXCL) {
		if (!down_write_trylock(&VFS_I(ip)->i_rwsem))
			goto out;
	} else if (lock_flags & XFS_IOLOCK_SHARED) {
		if (!down_read_trylock(&VFS_I(ip)->i_rwsem))
			goto out;
	}

	if (lock_flags & XFS_MMAPLOCK_EXCL) {
		if (!mrtryupdate(&ip->i_mmaplock))
			goto out_undo_iolock;
	} else if (lock_flags & XFS_MMAPLOCK_SHARED) {
		if (!mrtryaccess(&ip->i_mmaplock))
			goto out_undo_iolock;
	}

	if (lock_flags & XFS_ILOCK_EXCL) {
		if (!mrtryupdate(&ip->i_lock))
			goto out_undo_mmaplock;
	} else if (lock_flags & XFS_ILOCK_SHARED) {
		if (!mrtryaccess(&ip->i_lock))
			goto out_undo_mmaplock;
	}
	return 1;

out_undo_mmaplock:
	if (lock_flags & XFS_MMAPLOCK_EXCL)
		mrunlock_excl(&ip->i_mmaplock);
	else if (lock_flags & XFS_MMAPLOCK_SHARED)
		mrunlock_shared(&ip->i_mmaplock);
out_undo_iolock:
	if (lock_flags & XFS_IOLOCK_EXCL)
		up_write(&VFS_I(ip)->i_rwsem);
	else if (lock_flags & XFS_IOLOCK_SHARED)
		up_read(&VFS_I(ip)->i_rwsem);
out:
	return 0;
}

Project: linux

xfs_iunlink_remove(
	struct xfs_trans	*tp,
	struct xfs_inode	*ip)
{
	struct xfs_mount	*mp = tp->t_mountp;
	struct xfs_agi		*agi;
	struct xfs_buf		*agibp;
	struct xfs_buf		*last_ibp;
	struct xfs_dinode	*last_dip = NULL;
	xfs_agnumber_t		agno = XFS_INO_TO_AGNO(mp, ip->i_ino);
	xfs_agino_t		agino = XFS_INO_TO_AGINO(mp, ip->i_ino);
	xfs_agino_t		next_agino;
	xfs_agino_t		head_agino;
	short			bucket_index = agino % XFS_AGI_UNLINKED_BUCKETS;
	int			error;

	trace_xfs_iunlink_remove(ip);

	/* Get the agi buffer first.  It ensures lock ordering on the list. */
	error = xfs_read_agi(mp, tp, agno, &agibp);
	if (error)
		return error;
	agi = agibp->b_addr;

	/*
	 * Get the index into the agi hash table for the list this inode will
	 * go on.  Make sure the head pointer isn't garbage.
	 */
	head_agino = be32_to_cpu(agi->agi_unlinked[bucket_index]);
	if (!xfs_verify_agino(mp, agno, head_agino)) {
		XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
				agi, sizeof(*agi));
		return -EFSCORRUPTED;
	}

	/*
	 * Set our inode's next_unlinked pointer to NULL and then return
	 * the old pointer value so that we can update whatever was previous
	 * to us in the list to point to whatever was next in the list.
	 */
	error = xfs_iunlink_update_inode(tp, ip, agno, NULLAGINO, &next_agino);
	if (error)
		return error;

	/*
	 * If there was a backref pointing from the next inode back to this
	 * one, remove it because we've removed this inode from the list.
	 *
	 * Later, if this inode was in the middle of the list we'll update
	 * this inode's backref to point from the next inode.
	 */
	if (next_agino != NULLAGINO) {
		error = xfs_iunlink_change_backref(agibp->b_pag, next_agino,
				NULLAGINO);
		if (error)
			return error;
	}

	if (head_agino != agino) {
		struct xfs_imap	imap;
		xfs_agino_t	prev_agino;

		/* We need to search the list for the inode being freed. */
		error = xfs_iunlink_map_prev(tp, agno, head_agino, agino,
				&prev_agino, &imap, &last_dip, &last_ibp,
				agibp->b_pag);
		if (error)
			return error;

		/* Point the previous inode on the list to the next inode. */
		xfs_iunlink_update_dinode(tp, agno, prev_agino, last_ibp,
				last_dip, &imap, next_agino);

		/*
		 * Now we deal with the backref for this inode.  If this inode
		 * pointed at a real inode, change the backref that pointed to
		 * us to point to our old next.  If this inode was the end of
		 * the list, delete the backref that pointed to us.  Note that
		 * change_backref takes care of deleting the backref if
		 * next_agino is NULLAGINO.
		 */
		return xfs_iunlink_change_backref(agibp->b_pag, agino,
				next_agino);
	}

	/* Point the head of the list to the next unlinked inode. */
	return xfs_iunlink_update_bucket(tp, agno, agibp, bucket_index,
			next_agino);
}

Project: linux

xfs_iunlink_obj_cmpfn(
	struct rhashtable_compare_arg	*arg,
	const void			*obj)
{
	const xfs_agino_t		*key = arg->key;
	const struct xfs_iunlink	*iu = obj;

	if (iu->iu_next_unlinked != *key)
		return 1;
	return 0;
}

Project: linux

xfs_iunlink_update_inode(
	struct xfs_trans	*tp,
	struct xfs_inode	*ip,
	xfs_agnumber_t		agno,
	xfs_agino_t		next_agino,
	xfs_agino_t		*old_next_agino)
{
	struct xfs_mount	*mp = tp->t_mountp;
	struct xfs_dinode	*dip;
	struct xfs_buf		*ibp;
	xfs_agino_t		old_value;
	int			error;

	ASSERT(xfs_verify_agino_or_null(mp, agno, next_agino));

	error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &ibp, 0);
	if (error)
		return error;

	/* Make sure the old pointer isn't garbage. */
	old_value = be32_to_cpu(dip->di_next_unlinked);
	if (!xfs_verify_agino_or_null(mp, agno, old_value)) {
		xfs_inode_verifier_error(ip, -EFSCORRUPTED, __func__, dip,
				sizeof(*dip), __this_address);
		error = -EFSCORRUPTED;
		goto out;
	}

	/*
	 * Since we're updating a linked list, we should never find that the
	 * current pointer is the same as the new value, unless we're
	 * terminating the list.
	 */
	*old_next_agino = old_value;
	if (old_value == next_agino) {
		if (next_agino != NULLAGINO) {
			xfs_inode_verifier_error(ip, -EFSCORRUPTED, __func__,
					dip, sizeof(*dip), __this_address);
			error = -EFSCORRUPTED;
		}
		goto out;
	}

	/* Ok, update the new pointer. */
	xfs_iunlink_update_dinode(tp, agno, XFS_INO_TO_AGINO(mp, ip->i_ino),
			ibp, dip, &ip->i_imap, next_agino);
	return 0;
out:
	xfs_trans_brelse(tp, ibp);
	return error;
}

Project: linux

xfs_iunlock2_io_mmap(
	struct xfs_inode	*ip1,
	struct xfs_inode	*ip2)
{
	bool			same_inode = (ip1 == ip2);

	xfs_iunlock(ip2, XFS_MMAPLOCK_EXCL);
	if (!same_inode)
		xfs_iunlock(ip1, XFS_MMAPLOCK_EXCL);
	inode_unlock(VFS_I(ip2));
	if (!same_inode)
		inode_unlock(VFS_I(ip1));
}

Project: linux

xfs_create_tmpfile(
	struct xfs_inode	*dp,
	umode_t			mode,
	struct xfs_inode	**ipp)
{
	struct xfs_mount	*mp = dp->i_mount;
	struct xfs_inode	*ip = NULL;
	struct xfs_trans	*tp = NULL;
	int			error;
	prid_t                  prid;
	struct xfs_dquot	*udqp = NULL;
	struct xfs_dquot	*gdqp = NULL;
	struct xfs_dquot	*pdqp = NULL;
	struct xfs_trans_res	*tres;
	uint			resblks;

	if (XFS_FORCED_SHUTDOWN(mp))
		return -EIO;

	prid = xfs_get_initial_prid(dp);

	/*
	 * Make sure that we have allocated dquot(s) on disk.
	 */
	error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid,
				XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,
				&udqp, &gdqp, &pdqp);
	if (error)
		return error;

	resblks = XFS_IALLOC_SPACE_RES(mp);
	tres = &M_RES(mp)->tr_create_tmpfile;

	error = xfs_trans_alloc(mp, tres, resblks, 0, 0, &tp);
	if (error)
		goto out_release_inode;

	error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp,
						pdqp, resblks, 1, 0);
	if (error)
		goto out_trans_cancel;

	error = xfs_dir_ialloc(&tp, dp, mode, 0, 0, prid, &ip);
	if (error)
		goto out_trans_cancel;

	if (mp->m_flags & XFS_MOUNT_WSYNC)
		xfs_trans_set_sync(tp);

	/*
	 * Attach the dquot(s) to the inodes and modify them incore.
	 * These ids of the inode couldn't have changed since the new
	 * inode has been locked ever since it was created.
	 */
	xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp);

	error = xfs_iunlink(tp, ip);
	if (error)
		goto out_trans_cancel;

	error = xfs_trans_commit(tp);
	if (error)
		goto out_release_inode;

	xfs_qm_dqrele(udqp);
	xfs_qm_dqrele(gdqp);
	xfs_qm_dqrele(pdqp);

	*ipp = ip;
	return 0;

 out_trans_cancel:
	xfs_trans_cancel(tp);
 out_release_inode:
	/*
	 * Wait until after the current transaction is aborted to finish the
	 * setup of the inode and release the inode.  This prevents recursive
	 * transactions and deadlocks from xfs_inactive.
	 */
	if (ip) {
		xfs_finish_inode_setup(ip);
		xfs_irele(ip);
	}

	xfs_qm_dqrele(udqp);
	xfs_qm_dqrele(gdqp);
	xfs_qm_dqrele(pdqp);

	return error;
}

Project: linux

xfs_ilock_demote(
	xfs_inode_t		*ip,
	uint			lock_flags)
{
	ASSERT(lock_flags & (XFS_IOLOCK_EXCL|XFS_MMAPLOCK_EXCL|XFS_ILOCK_EXCL));
	ASSERT((lock_flags &
		~(XFS_IOLOCK_EXCL|XFS_MMAPLOCK_EXCL|XFS_ILOCK_EXCL)) == 0);

	if (lock_flags & XFS_ILOCK_EXCL)
		mrdemote(&ip->i_lock);
	if (lock_flags & XFS_MMAPLOCK_EXCL)
		mrdemote(&ip->i_mmaplock);
	if (lock_flags & XFS_IOLOCK_EXCL)
		downgrade_write(&VFS_I(ip)->i_rwsem);

	trace_xfs_ilock_demote(ip, lock_flags, _RET_IP_);
}

Project: linux

xfs_iunlink_change_backref(
	struct xfs_perag	*pag,
	xfs_agino_t		agino,
	xfs_agino_t		next_unlinked)
{
	struct xfs_iunlink	*iu;
	int			error;

	/* Look up the old entry; if there wasn't one then exit. */
	iu = rhashtable_lookup_fast(&pag->pagi_unlinked_hash, &agino,
			xfs_iunlink_hash_params);
	if (!iu)
		return 0;

	/*
	 * Remove the entry.  This shouldn't ever return an error, but if we
	 * couldn't remove the old entry we don't want to add it again to the
	 * hash table, and if the entry disappeared on us then someone's
	 * violated the locking rules and we need to fail loudly.  Either way
	 * we cannot remove the inode because internal state is or would have
	 * been corrupt.
	 */
	error = rhashtable_remove_fast(&pag->pagi_unlinked_hash,
			&iu->iu_rhash_head, xfs_iunlink_hash_params);
	if (error)
		return error;

	/* If there is no new next entry just free our item and return. */
	if (next_unlinked == NULLAGINO) {
		kmem_free(iu);
		return 0;
	}

	/* Update the entry and re-add it to the hash table. */
	iu->iu_next_unlinked = next_unlinked;
	return xfs_iunlink_insert_backref(pag, iu);
}

Project: linux

xfs_isilocked(
	xfs_inode_t		*ip,
	uint			lock_flags)
{
	if (lock_flags & (XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)) {
		if (!(lock_flags & XFS_ILOCK_SHARED))
			return !!ip->i_lock.mr_writer;
		return rwsem_is_locked(&ip->i_lock.mr_lock);
	}

	if (lock_flags & (XFS_MMAPLOCK_EXCL|XFS_MMAPLOCK_SHARED)) {
		if (!(lock_flags & XFS_MMAPLOCK_SHARED))
			return !!ip->i_mmaplock.mr_writer;
		return rwsem_is_locked(&ip->i_mmaplock.mr_lock);
	}

	if (lock_flags & (XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED)) {
		if (!(lock_flags & XFS_IOLOCK_SHARED))
			return !debug_locks ||
				lockdep_is_held_type(&VFS_I(ip)->i_rwsem, 0);
		return rwsem_is_locked(&VFS_I(ip)->i_rwsem);
	}

	ASSERT(0);
	return 0;
}

Project: linux

xfs_itruncate_clear_reflink_flags(
	struct xfs_inode	*ip)
{
	struct xfs_ifork	*dfork;
	struct xfs_ifork	*cfork;

	if (!xfs_is_reflink_inode(ip))
		return;
	dfork = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
	cfork = XFS_IFORK_PTR(ip, XFS_COW_FORK);
	if (dfork->if_bytes == 0 && cfork->if_bytes == 0)
		ip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK;
	if (cfork->if_bytes == 0)
		xfs_inode_clear_cowblocks_tag(ip);
}

Project: linux

xfs_iunlink_lookup_backref(
	struct xfs_perag	*pag,
	xfs_agino_t		agino)
{
	struct xfs_iunlink	*iu;

	iu = rhashtable_lookup_fast(&pag->pagi_unlinked_hash, &agino,
			xfs_iunlink_hash_params);
	return iu ? iu->iu_agino : NULLAGINO;
}

Project: linux

xfs_iunlink_update_bucket(
	struct xfs_trans	*tp,
	xfs_agnumber_t		agno,
	struct xfs_buf		*agibp,
	unsigned int		bucket_index,
	xfs_agino_t		new_agino)
{
	struct xfs_agi		*agi = agibp->b_addr;
	xfs_agino_t		old_value;
	int			offset;

	ASSERT(xfs_verify_agino_or_null(tp->t_mountp, agno, new_agino));

	old_value = be32_to_cpu(agi->agi_unlinked[bucket_index]);
	trace_xfs_iunlink_update_bucket(tp->t_mountp, agno, bucket_index,
			old_value, new_agino);

	/*
	 * We should never find the head of the list already set to the value
	 * passed in because either we're adding or removing ourselves from the
	 * head of the list.
	 */
	if (old_value == new_agino) {
		xfs_buf_mark_corrupt(agibp);
		return -EFSCORRUPTED;
	}

	agi->agi_unlinked[bucket_index] = cpu_to_be32(new_agino);
	offset = offsetof(struct xfs_agi, agi_unlinked) +
			(sizeof(xfs_agino_t) * bucket_index);
	xfs_trans_log_buf(tp, agibp, offset, offset + sizeof(xfs_agino_t) - 1);
	return 0;
}

Project: linux

xfs_iunlink_insert_backref(
	struct xfs_perag	*pag,
	struct xfs_iunlink	*iu)
{
	int			error;

	error = rhashtable_insert_fast(&pag->pagi_unlinked_hash,
			&iu->iu_rhash_head, xfs_iunlink_hash_params);
	/*
	 * Fail loudly if there already was an entry because that's a sign of
	 * corruption of in-memory data.  Also fail loudly if we see an error
	 * code we didn't anticipate from the rhashtable code.  Currently we
	 * only anticipate ENOMEM.
	 */
	if (error) {
		WARN(error != -ENOMEM, "iunlink cache insert error %d", error);
		kmem_free(iu);
	}
	/*
	 * Absorb any runtime errors that aren't a result of corruption because
	 * this is a cache and we can always fall back to bucket list scanning.
	 */
	if (error != 0 && error != -EEXIST)
		error = 0;
	return error;
}

Project: linux

xfs_lock_two_inodes(
	struct xfs_inode	*ip0,
	uint			ip0_mode,
	struct xfs_inode	*ip1,
	uint			ip1_mode)
{
	struct xfs_inode	*temp;
	uint			mode_temp;
	int			attempts = 0;
	struct xfs_log_item	*lp;

	ASSERT(hweight32(ip0_mode) == 1);
	ASSERT(hweight32(ip1_mode) == 1);
	ASSERT(!(ip0_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)));
	ASSERT(!(ip1_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)));
	ASSERT(!(ip0_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)) ||
	       !(ip0_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)));
	ASSERT(!(ip1_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)) ||
	       !(ip1_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)));
	ASSERT(!(ip1_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)) ||
	       !(ip0_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)));
	ASSERT(!(ip0_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)) ||
	       !(ip1_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)));

	ASSERT(ip0->i_ino != ip1->i_ino);

	if (ip0->i_ino > ip1->i_ino) {
		temp = ip0;
		ip0 = ip1;
		ip1 = temp;
		mode_temp = ip0_mode;
		ip0_mode = ip1_mode;
		ip1_mode = mode_temp;
	}

 again:
	xfs_ilock(ip0, xfs_lock_inumorder(ip0_mode, 0));

	/*
	 * If the first lock we have locked is in the AIL, we must TRY to get
	 * the second lock. If we can't get it, we must release the first one
	 * and try again.
	 */
	lp = &ip0->i_itemp->ili_item;
	if (lp && test_bit(XFS_LI_IN_AIL, &lp->li_flags)) {
		if (!xfs_ilock_nowait(ip1, xfs_lock_inumorder(ip1_mode, 1))) {
			xfs_iunlock(ip0, ip0_mode);
			if ((++attempts % 5) == 0)
				delay(1); /* Don't just spin the CPU */
			goto again;
		}
	} else {
		xfs_ilock(ip1, xfs_lock_inumorder(ip1_mode, 1));
	}
}

Project: linux

xfs_lock_inumorder(int lock_mode, int subclass)
{
	int	class = 0;

	ASSERT(!(lock_mode & (XFS_ILOCK_PARENT | XFS_ILOCK_RTBITMAP |
			      XFS_ILOCK_RTSUM)));
	ASSERT(xfs_lockdep_subclass_ok(subclass));

	if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)) {
		ASSERT(subclass <= XFS_IOLOCK_MAX_SUBCLASS);
		class += subclass << XFS_IOLOCK_SHIFT;
	}

	if (lock_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)) {
		ASSERT(subclass <= XFS_MMAPLOCK_MAX_SUBCLASS);
		class += subclass << XFS_MMAPLOCK_SHIFT;
	}

	if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) {
		ASSERT(subclass <= XFS_ILOCK_MAX_SUBCLASS);
		class += subclass << XFS_ILOCK_SHIFT;
	}

	return (lock_mode & ~XFS_LOCK_SUBCLASS_MASK) | class;
}

Project: linux

xfs_rename(
	struct xfs_inode	*src_dp,
	struct xfs_name		*src_name,
	struct xfs_inode	*src_ip,
	struct xfs_inode	*target_dp,
	struct xfs_name		*target_name,
	struct xfs_inode	*target_ip,
	unsigned int		flags)
{
	struct xfs_mount	*mp = src_dp->i_mount;
	struct xfs_trans	*tp;
	struct xfs_inode	*wip = NULL;		/* whiteout inode */
	struct xfs_inode	*inodes[__XFS_SORT_INODES];
	int			i;
	int			num_inodes = __XFS_SORT_INODES;
	bool			new_parent = (src_dp != target_dp);
	bool			src_is_directory = S_ISDIR(VFS_I(src_ip)->i_mode);
	int			spaceres;
	int			error;

	trace_xfs_rename(src_dp, target_dp, src_name, target_name);

	if ((flags & RENAME_EXCHANGE) && !target_ip)
		return -EINVAL;

	/*
	 * If we are doing a whiteout operation, allocate the whiteout inode
	 * we will be placing at the target and ensure the type is set
	 * appropriately.
	 */
	if (flags & RENAME_WHITEOUT) {
		ASSERT(!(flags & (RENAME_NOREPLACE | RENAME_EXCHANGE)));
		error = xfs_rename_alloc_whiteout(target_dp, &wip);
		if (error)
			return error;

		/* setup target dirent info as whiteout */
		src_name->type = XFS_DIR3_FT_CHRDEV;
	}

	xfs_sort_for_rename(src_dp, target_dp, src_ip, target_ip, wip,
				inodes, &num_inodes);

	spaceres = XFS_RENAME_SPACE_RES(mp, target_name->len);
	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_rename, spaceres, 0, 0, &tp);
	if (error == -ENOSPC) {
		spaceres = 0;
		error = xfs_trans_alloc(mp, &M_RES(mp)->tr_rename, 0, 0, 0,
				&tp);
	}
	if (error)
		goto out_release_wip;

	/*
	 * Attach the dquots to the inodes
	 */
	error = xfs_qm_vop_rename_dqattach(inodes);
	if (error)
		goto out_trans_cancel;

	/*
	 * Lock all the participating inodes. Depending upon whether
	 * the target_name exists in the target directory, and
	 * whether the target directory is the same as the source
	 * directory, we can lock from 2 to 4 inodes.
	 */
	xfs_lock_inodes(inodes, num_inodes, XFS_ILOCK_EXCL);

	/*
	 * Join all the inodes to the transaction. From this point on,
	 * we can rely on either trans_commit or trans_cancel to unlock
	 * them.
	 */
	xfs_trans_ijoin(tp, src_dp, XFS_ILOCK_EXCL);
	if (new_parent)
		xfs_trans_ijoin(tp, target_dp, XFS_ILOCK_EXCL);
	xfs_trans_ijoin(tp, src_ip, XFS_ILOCK_EXCL);
	if (target_ip)
		xfs_trans_ijoin(tp, target_ip, XFS_ILOCK_EXCL);
	if (wip)
		xfs_trans_ijoin(tp, wip, XFS_ILOCK_EXCL);

	/*
	 * If we are using project inheritance, we only allow renames
	 * into our tree when the project IDs are the same; else the
	 * tree quota mechanism would be circumvented.
	 */
	if (unlikely((target_dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
		     target_dp->i_d.di_projid != src_ip->i_d.di_projid)) {
		error = -EXDEV;
		goto out_trans_cancel;
	}

	/* RENAME_EXCHANGE is unique from here on. */
	if (flags & RENAME_EXCHANGE)
		return xfs_cross_rename(tp, src_dp, src_name, src_ip,
					target_dp, target_name, target_ip,
					spaceres);

	/*
	 * Check for expected errors before we dirty the transaction
	 * so we can return an error without a transaction abort.
	 *
	 * Extent count overflow check:
	 *
	 * From the perspective of src_dp, a rename operation is essentially a
	 * directory entry remove operation. Hence the only place where we check
	 * for extent count overflow for src_dp is in
	 * xfs_bmap_del_extent_real(). xfs_bmap_del_extent_real() returns
	 * -ENOSPC when it detects a possible extent count overflow and in
	 * response, the higher layers of directory handling code do the
	 * following:
	 * 1. Data/Free blocks: XFS lets these blocks linger until a
	 *    future remove operation removes them.
	 * 2. Dabtree blocks: XFS swaps the blocks with the last block in the
	 *    Leaf space and unmaps the last block.
	 *
	 * For target_dp, there are two cases depending on whether the
	 * destination directory entry exists or not.
	 *
	 * When destination directory entry does not exist (i.e. target_ip ==
	 * NULL), extent count overflow check is performed only when transaction
	 * has a non-zero sized space reservation associated with it.  With a
	 * zero-sized space reservation, XFS allows a rename operation to
	 * continue only when the directory has sufficient free space in its
	 * data/leaf/free space blocks to hold the new entry.
	 *
	 * When destination directory entry exists (i.e. target_ip != NULL), all
	 * we need to do is change the inode number associated with the already
	 * existing entry. Hence there is no need to perform an extent count
	 * overflow check.
	 */
	if (target_ip == NULL) {
		/*
		 * If there's no space reservation, check the entry will
		 * fit before actually inserting it.
		 */
		if (!spaceres) {
			error = xfs_dir_canenter(tp, target_dp, target_name);
			if (error)
				goto out_trans_cancel;
		} else {
			error = xfs_iext_count_may_overflow(target_dp,
					XFS_DATA_FORK,
					XFS_IEXT_DIR_MANIP_CNT(mp));
			if (error)
				goto out_trans_cancel;
		}
	} else {
		/*
		 * If target exists and it's a directory, check that whether
		 * it can be destroyed.
		 */
		if (S_ISDIR(VFS_I(target_ip)->i_mode) &&
		    (!xfs_dir_isempty(target_ip) ||
		     (VFS_I(target_ip)->i_nlink > 2))) {
			error = -EEXIST;
			goto out_trans_cancel;
		}
	}

	/*
	 * Lock the AGI buffers we need to handle bumping the nlink of the
	 * whiteout inode off the unlinked list and to handle dropping the
	 * nlink of the target inode.  Per locking order rules, do this in
	 * increasing AG order and before directory block allocation tries to
	 * grab AGFs because we grab AGIs before AGFs.
	 *
	 * The (vfs) caller must ensure that if src is a directory then
	 * target_ip is either null or an empty directory.
	 */
	for (i = 0; i < num_inodes && inodes[i] != NULL; i++) {
		if (inodes[i] == wip ||
		    (inodes[i] == target_ip &&
		     (VFS_I(target_ip)->i_nlink == 1 || src_is_directory))) {
			struct xfs_buf	*bp;
			xfs_agnumber_t	agno;

			agno = XFS_INO_TO_AGNO(mp, inodes[i]->i_ino);
			error = xfs_read_agi(mp, tp, agno, &bp);
			if (error)
				goto out_trans_cancel;
		}
	}

	/*
	 * Directory entry creation below may acquire the AGF. Remove
	 * the whiteout from the unlinked list first to preserve correct
	 * AGI/AGF locking order. This dirties the transaction so failures
	 * after this point will abort and log recovery will clean up the
	 * mess.
	 *
	 * For whiteouts, we need to bump the link count on the whiteout
	 * inode. After this point, we have a real link, clear the tmpfile
	 * state flag from the inode so it doesn't accidentally get misused
	 * in future.
	 */
	if (wip) {
		ASSERT(VFS_I(wip)->i_nlink == 0);
		error = xfs_iunlink_remove(tp, wip);
		if (error)
			goto out_trans_cancel;

		xfs_bumplink(tp, wip);
		VFS_I(wip)->i_state &= ~I_LINKABLE;
	}

	/*
	 * Set up the target.
	 */
	if (target_ip == NULL) {
		/*
		 * If target does not exist and the rename crosses
		 * directories, adjust the target directory link count
		 * to account for the ".." reference from the new entry.
		 */
		error = xfs_dir_createname(tp, target_dp, target_name,
					   src_ip->i_ino, spaceres);
		if (error)
			goto out_trans_cancel;

		xfs_trans_ichgtime(tp, target_dp,
					XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);

		if (new_parent && src_is_directory) {
			xfs_bumplink(tp, target_dp);
		}
	} else { /* target_ip != NULL */
		/*
		 * Link the source inode under the target name.
		 * If the source inode is a directory and we are moving
		 * it across directories, its ".." entry will be
		 * inconsistent until we replace that down below.
		 *
		 * In case there is already an entry with the same
		 * name at the destination directory, remove it first.
		 */
		error = xfs_dir_replace(tp, target_dp, target_name,
					src_ip->i_ino, spaceres);
		if (error)
			goto out_trans_cancel;

		xfs_trans_ichgtime(tp, target_dp,
					XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);

		/*
		 * Decrement the link count on the target since the target
		 * dir no longer points to it.
		 */
		error = xfs_droplink(tp, target_ip);
		if (error)
			goto out_trans_cancel;

		if (src_is_directory) {
			/*
			 * Drop the link from the old "." entry.
			 */
			error = xfs_droplink(tp, target_ip);
			if (error)
				goto out_trans_cancel;
		}
	} /* target_ip != NULL */

	/*
	 * Remove the source.
	 */
	if (new_parent && src_is_directory) {
		/*
		 * Rewrite the ".." entry to point to the new
		 * directory.
		 */
		error = xfs_dir_replace(tp, src_ip, &xfs_name_dotdot,
					target_dp->i_ino, spaceres);
		ASSERT(error != -EEXIST);
		if (error)
			goto out_trans_cancel;
	}

	/*
	 * We always want to hit the ctime on the source inode.
	 *
	 * This isn't strictly required by the standards since the source
	 * inode isn't really being changed, but old unix file systems did
	 * it and some incremental backup programs won't work without it.
	 */
	xfs_trans_ichgtime(tp, src_ip, XFS_ICHGTIME_CHG);
	xfs_trans_log_inode(tp, src_ip, XFS_ILOG_CORE);

	/*
	 * Adjust the link count on src_dp.  This is necessary when
	 * renaming a directory, either within one parent when
	 * the target existed, or across two parent directories.
	 */
	if (src_is_directory && (new_parent || target_ip != NULL)) {

		/*
		 * Decrement link count on src_directory since the
		 * entry that's moved no longer points to it.
		 */
		error = xfs_droplink(tp, src_dp);
		if (error)
			goto out_trans_cancel;
	}

	/*
	 * For whiteouts, we only need to update the source dirent with the
	 * inode number of the whiteout inode rather than removing it
	 * altogether.
	 */
	if (wip) {
		error = xfs_dir_replace(tp, src_dp, src_name, wip->i_ino,
					spaceres);
	} else {
		/*
		 * NOTE: We don't need to check for extent count overflow here
		 * because the dir remove name code will leave the dir block in
		 * place if the extent count would overflow.
		 */
		error = xfs_dir_removename(tp, src_dp, src_name, src_ip->i_ino,
					   spaceres);
	}

	if (error)
		goto out_trans_cancel;

	xfs_trans_ichgtime(tp, src_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
	xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE);
	if (new_parent)
		xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE);

	error = xfs_finish_rename(tp);
	if (wip)
		xfs_irele(wip);
	return error;

out_trans_cancel:
	xfs_trans_cancel(tp);
out_release_wip:
	if (wip)
		xfs_irele(wip);
	return error;
}

Project: linux

xfs_iflush(
	struct xfs_inode	*ip,
	struct xfs_buf		*bp)
{
	struct xfs_inode_log_item *iip = ip->i_itemp;
	struct xfs_dinode	*dip;
	struct xfs_mount	*mp = ip->i_mount;
	int			error;

	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
	ASSERT(xfs_iflags_test(ip, XFS_IFLUSHING));
	ASSERT(ip->i_df.if_format != XFS_DINODE_FMT_BTREE ||
	       ip->i_df.if_nextents > XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK));
	ASSERT(iip->ili_item.li_buf == bp);

	dip = xfs_buf_offset(bp, ip->i_imap.im_boffset);

	/*
	 * We don't flush the inode if any of the following checks fail, but we
	 * do still update the log item and attach to the backing buffer as if
	 * the flush happened. This is a formality to facilitate predictable
	 * error handling as the caller will shutdown and fail the buffer.
	 */
	error = -EFSCORRUPTED;
	if (XFS_TEST_ERROR(dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC),
			       mp, XFS_ERRTAG_IFLUSH_1)) {
		xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
			"%s: Bad inode %Lu magic number 0x%x, ptr "PTR_FMT,
			__func__, ip->i_ino, be16_to_cpu(dip->di_magic), dip);
		goto flush_out;
	}
	if (S_ISREG(VFS_I(ip)->i_mode)) {
		if (XFS_TEST_ERROR(
		    ip->i_df.if_format != XFS_DINODE_FMT_EXTENTS &&
		    ip->i_df.if_format != XFS_DINODE_FMT_BTREE,
		    mp, XFS_ERRTAG_IFLUSH_3)) {
			xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
				"%s: Bad regular inode %Lu, ptr "PTR_FMT,
				__func__, ip->i_ino, ip);
			goto flush_out;
		}
	} else if (S_ISDIR(VFS_I(ip)->i_mode)) {
		if (XFS_TEST_ERROR(
		    ip->i_df.if_format != XFS_DINODE_FMT_EXTENTS &&
		    ip->i_df.if_format != XFS_DINODE_FMT_BTREE &&
		    ip->i_df.if_format != XFS_DINODE_FMT_LOCAL,
		    mp, XFS_ERRTAG_IFLUSH_4)) {
			xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
				"%s: Bad directory inode %Lu, ptr "PTR_FMT,
				__func__, ip->i_ino, ip);
			goto flush_out;
		}
	}
	if (XFS_TEST_ERROR(ip->i_df.if_nextents + xfs_ifork_nextents(ip->i_afp) >
				ip->i_d.di_nblocks, mp, XFS_ERRTAG_IFLUSH_5)) {
		xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
			"%s: detected corrupt incore inode %Lu, "
			"total extents = %d, nblocks = %Ld, ptr "PTR_FMT,
			__func__, ip->i_ino,
			ip->i_df.if_nextents + xfs_ifork_nextents(ip->i_afp),
			ip->i_d.di_nblocks, ip);
		goto flush_out;
	}
	if (XFS_TEST_ERROR(ip->i_d.di_forkoff > mp->m_sb.sb_inodesize,
				mp, XFS_ERRTAG_IFLUSH_6)) {
		xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
			"%s: bad inode %Lu, forkoff 0x%x, ptr "PTR_FMT,
			__func__, ip->i_ino, ip->i_d.di_forkoff, ip);
		goto flush_out;
	}

	/*
	 * Inode item log recovery for v2 inodes are dependent on the
	 * di_flushiter count for correct sequencing. We bump the flush
	 * iteration count so we can detect flushes which postdate a log record
	 * during recovery. This is redundant as we now log every change and
	 * hence this can't happen but we need to still do it to ensure
	 * backwards compatibility with old kernels that predate logging all
	 * inode changes.
	 */
	if (!xfs_sb_version_has_v3inode(&mp->m_sb))
		ip->i_d.di_flushiter++;

	/*
	 * If there are inline format data / attr forks attached to this inode,
	 * make sure they are not corrupt.
	 */
	if (ip->i_df.if_format == XFS_DINODE_FMT_LOCAL &&
	    xfs_ifork_verify_local_data(ip))
		goto flush_out;
	if (ip->i_afp && ip->i_afp->if_format == XFS_DINODE_FMT_LOCAL &&
	    xfs_ifork_verify_local_attr(ip))
		goto flush_out;

	/*
	 * Copy the dirty parts of the inode into the on-disk inode.  We always
	 * copy out the core of the inode, because if the inode is dirty at all
	 * the core must be.
	 */
	xfs_inode_to_disk(ip, dip, iip->ili_item.li_lsn);

	/* Wrap, we never let the log put out DI_MAX_FLUSH */
	if (ip->i_d.di_flushiter == DI_MAX_FLUSH)
		ip->i_d.di_flushiter = 0;

	xfs_iflush_fork(ip, dip, iip, XFS_DATA_FORK);
	if (XFS_IFORK_Q(ip))
		xfs_iflush_fork(ip, dip, iip, XFS_ATTR_FORK);

	/*
	 * We've recorded everything logged in the inode, so we'd like to clear
	 * the ili_fields bits so we don't log and flush things unnecessarily.
	 * However, we can't stop logging all this information until the data
	 * we've copied into the disk buffer is written to disk.  If we did we
	 * might overwrite the copy of the inode in the log with all the data
	 * after re-logging only part of it, and in the face of a crash we
	 * wouldn't have all the data we need to recover.
	 *
	 * What we do is move the bits to the ili_last_fields field.  When
	 * logging the inode, these bits are moved back to the ili_fields field.
	 * In the xfs_buf_inode_iodone() routine we clear ili_last_fields, since
	 * we know that the information those bits represent is permanently on
	 * disk.  As long as the flush completes before the inode is logged
	 * again, then both ili_fields and ili_last_fields will be cleared.
	 */
	error = 0;
flush_out:
	spin_lock(&iip->ili_lock);
	iip->ili_last_fields = iip->ili_fields;
	iip->ili_fields = 0;
	iip->ili_fsync_fields = 0;
	spin_unlock(&iip->ili_lock);

	/*
	 * Store the current LSN of the inode so that we can tell whether the
	 * item has moved in the AIL from xfs_buf_inode_iodone().
	 */
	xfs_trans_ail_copy_lsn(mp->m_ail, &iip->ili_flush_lsn,
				&iip->ili_item.li_lsn);

	/* generate the checksum. */
	xfs_dinode_calc_crc(mp, dip);
	return error;
}

Project: linux

xfs_iflush_cluster(
	struct xfs_buf		*bp)
{
	struct xfs_mount	*mp = bp->b_mount;
	struct xfs_log_item	*lip, *n;
	struct xfs_inode	*ip;
	struct xfs_inode_log_item *iip;
	int			clcount = 0;
	int			error = 0;

	/*
	 * We must use the safe variant here as on shutdown xfs_iflush_abort()
	 * can remove itself from the list.
	 */
	list_for_each_entry_safe(lip, n, &bp->b_li_list, li_bio_list) {
		iip = (struct xfs_inode_log_item *)lip;
		ip = iip->ili_inode;

		/*
		 * Quick and dirty check to avoid locks if possible.
		 */
		if (__xfs_iflags_test(ip, XFS_IRECLAIM | XFS_IFLUSHING))
			continue;
		if (xfs_ipincount(ip))
			continue;

		/*
		 * The inode is still attached to the buffer, which means it is
		 * dirty but reclaim might try to grab it. Check carefully for
		 * that, and grab the ilock while still holding the i_flags_lock
		 * to guarantee reclaim will not be able to reclaim this inode
		 * once we drop the i_flags_lock.
		 */
		spin_lock(&ip->i_flags_lock);
		ASSERT(!__xfs_iflags_test(ip, XFS_ISTALE));
		if (__xfs_iflags_test(ip, XFS_IRECLAIM | XFS_IFLUSHING)) {
			spin_unlock(&ip->i_flags_lock);
			continue;
		}

		/*
		 * ILOCK will pin the inode against reclaim and prevent
		 * concurrent transactions modifying the inode while we are
		 * flushing the inode. If we get the lock, set the flushing
		 * state before we drop the i_flags_lock.
		 */
		if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) {
			spin_unlock(&ip->i_flags_lock);
			continue;
		}
		__xfs_iflags_set(ip, XFS_IFLUSHING);
		spin_unlock(&ip->i_flags_lock);

		/*
		 * Abort flushing this inode if we are shut down because the
		 * inode may not currently be in the AIL. This can occur when
		 * log I/O failure unpins the inode without inserting into the
		 * AIL, leaving a dirty/unpinned inode attached to the buffer
		 * that otherwise looks like it should be flushed.
		 */
		if (XFS_FORCED_SHUTDOWN(mp)) {
			xfs_iunpin_wait(ip);
			xfs_iflush_abort(ip);
			xfs_iunlock(ip, XFS_ILOCK_SHARED);
			error = -EIO;
			continue;
		}

		/* don't block waiting on a log force to unpin dirty inodes */
		if (xfs_ipincount(ip)) {
			xfs_iflags_clear(ip, XFS_IFLUSHING);
			xfs_iunlock(ip, XFS_ILOCK_SHARED);
			continue;
		}

		if (!xfs_inode_clean(ip))
			error = xfs_iflush(ip, bp);
		else
			xfs_iflags_clear(ip, XFS_IFLUSHING);
		xfs_iunlock(ip, XFS_ILOCK_SHARED);
		if (error)
			break;
		clcount++;
	}

	if (error) {
		bp->b_flags |= XBF_ASYNC;
		xfs_buf_ioend_fail(bp);
		xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
		return error;
	}

	if (!clcount)
		return -EAGAIN;

	XFS_STATS_INC(mp, xs_icluster_flushcnt);
	XFS_STATS_ADD(mp, xs_icluster_flushinode, clcount);
	return 0;

}

Project: linux

xfs_log_force_inode(
	struct xfs_inode	*ip)
{
	xfs_lsn_t		lsn = 0;

	xfs_ilock(ip, XFS_ILOCK_SHARED);
	if (xfs_ipincount(ip))
		lsn = ip->i_itemp->ili_last_lsn;
	xfs_iunlock(ip, XFS_ILOCK_SHARED);

	if (!lsn)
		return 0;
	return xfs_log_force_lsn(ip->i_mount, lsn, XFS_LOG_SYNC, NULL);
}

Project: linux

xfs_inactive_ifree(
	struct xfs_inode *ip)
{
	struct xfs_mount	*mp = ip->i_mount;
	struct xfs_trans	*tp;
	int			error;

	/*
	 * We try to use a per-AG reservation for any block needed by the finobt
	 * tree, but as the finobt feature predates the per-AG reservation
	 * support a degraded file system might not have enough space for the
	 * reservation at mount time.  In that case try to dip into the reserved
	 * pool and pray.
	 *
	 * Send a warning if the reservation does happen to fail, as the inode
	 * now remains allocated and sits on the unlinked list until the fs is
	 * repaired.
	 */
	if (unlikely(mp->m_finobt_nores)) {
		error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ifree,
				XFS_IFREE_SPACE_RES(mp), 0, XFS_TRANS_RESERVE,
				&tp);
	} else {
		error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ifree, 0, 0, 0, &tp);
	}
	if (error) {
		if (error == -ENOSPC) {
			xfs_warn_ratelimited(mp,
			"Failed to remove inode(s) from unlinked list. "
			"Please free space, unmount and run xfs_repair.");
		} else {
			ASSERT(XFS_FORCED_SHUTDOWN(mp));
		}
		return error;
	}

	/*
	 * We do not hold the inode locked across the entire rolling transaction
	 * here. We only need to hold it for the first transaction that
	 * xfs_ifree() builds, which may mark the inode XFS_ISTALE if the
	 * underlying cluster buffer is freed. Relogging an XFS_ISTALE inode
	 * here breaks the relationship between cluster buffer invalidation and
	 * stale inode invalidation on cluster buffer item journal commit
	 * completion, and can result in leaving dirty stale inodes hanging
	 * around in memory.
	 *
	 * We have no need for serialising this inode operation against other
	 * operations - we freed the inode and hence reallocation is required
	 * and that will serialise on reallocating the space the deferops need
	 * to free. Hence we can unlock the inode on the first commit of
	 * the transaction rather than roll it right through the deferops. This
	 * avoids relogging the XFS_ISTALE inode.
	 *
	 * We check that xfs_ifree() hasn't grown an internal transaction roll
	 * by asserting that the inode is still locked when it returns.
	 */
	xfs_ilock(ip, XFS_ILOCK_EXCL);
	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);

	error = xfs_ifree(tp, ip);
	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
	if (error) {
		/*
		 * If we fail to free the inode, shut down.  The cancel
		 * might do that, we need to make sure.  Otherwise the
		 * inode might be lost for a long time or forever.
		 */
		if (!XFS_FORCED_SHUTDOWN(mp)) {
			xfs_notice(mp, "%s: xfs_ifree returned error %d",
				__func__, error);
			xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
		}
		xfs_trans_cancel(tp);
		return error;
	}

	/*
	 * Credit the quota account(s). The inode is gone.
	 */
	xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_ICOUNT, -1);

	/*
	 * Just ignore errors at this point.  There is nothing we can do except
	 * to try to keep going. Make sure it's not a silent error.
	 */
	error = xfs_trans_commit(tp);
	if (error)
		xfs_notice(mp, "%s: xfs_trans_commit returned error %d",
			__func__, error);

	return 0;
}

Project: linux

xfs_ip2xflags(
	struct xfs_inode	*ip)
{
	struct xfs_icdinode	*dic = &ip->i_d;

	return _xfs_dic2xflags(dic->di_flags, dic->di_flags2, XFS_IFORK_Q(ip));
}

Project: linux

xfs_create(
	xfs_inode_t		*dp,
	struct xfs_name		*name,
	umode_t			mode,
	dev_t			rdev,
	xfs_inode_t		**ipp)
{
	int			is_dir = S_ISDIR(mode);
	struct xfs_mount	*mp = dp->i_mount;
	struct xfs_inode	*ip = NULL;
	struct xfs_trans	*tp = NULL;
	int			error;
	bool                    unlock_dp_on_error = false;
	prid_t			prid;
	struct xfs_dquot	*udqp = NULL;
	struct xfs_dquot	*gdqp = NULL;
	struct xfs_dquot	*pdqp = NULL;
	struct xfs_trans_res	*tres;
	uint			resblks;

	trace_xfs_create(dp, name);

	if (XFS_FORCED_SHUTDOWN(mp))
		return -EIO;

	prid = xfs_get_initial_prid(dp);

	/*
	 * Make sure that we have allocated dquot(s) on disk.
	 */
	error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid,
					XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,
					&udqp, &gdqp, &pdqp);
	if (error)
		return error;

	if (is_dir) {
		resblks = XFS_MKDIR_SPACE_RES(mp, name->len);
		tres = &M_RES(mp)->tr_mkdir;
	} else {
		resblks = XFS_CREATE_SPACE_RES(mp, name->len);
		tres = &M_RES(mp)->tr_create;
	}

	/*
	 * Initially assume that the file does not exist and
	 * reserve the resources for that case.  If that is not
	 * the case we'll drop the one we have and get a more
	 * appropriate transaction later.
	 */
	error = xfs_trans_alloc(mp, tres, resblks, 0, 0, &tp);
	if (error == -ENOSPC) {
		/* flush outstanding delalloc blocks and retry */
		xfs_flush_inodes(mp);
		error = xfs_trans_alloc(mp, tres, resblks, 0, 0, &tp);
	}
	if (error)
		goto out_release_inode;

	xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
	unlock_dp_on_error = true;

	/*
	 * Reserve disk quota and the inode.
	 */
	error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp,
						pdqp, resblks, 1, 0);
	if (error)
		goto out_trans_cancel;

	error = xfs_iext_count_may_overflow(dp, XFS_DATA_FORK,
			XFS_IEXT_DIR_MANIP_CNT(mp));
	if (error)
		goto out_trans_cancel;

	/*
	 * A newly created regular or special file just has one directory
	 * entry pointing to them, but a directory also the "." entry
	 * pointing to itself.
	 */
	error = xfs_dir_ialloc(&tp, dp, mode, is_dir ? 2 : 1, rdev, prid, &ip);
	if (error)
		goto out_trans_cancel;

	/*
	 * Now we join the directory inode to the transaction.  We do not do it
	 * earlier because xfs_dir_ialloc might commit the previous transaction
	 * (and release all the locks).  An error from here on will result in
	 * the transaction cancel unlocking dp so don't do it explicitly in the
	 * error path.
	 */
	xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
	unlock_dp_on_error = false;

	error = xfs_dir_createname(tp, dp, name, ip->i_ino,
					resblks - XFS_IALLOC_SPACE_RES(mp));
	if (error) {
		ASSERT(error != -ENOSPC);
		goto out_trans_cancel;
	}
	xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
	xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);

	if (is_dir) {
		error = xfs_dir_init(tp, ip, dp);
		if (error)
			goto out_trans_cancel;

		xfs_bumplink(tp, dp);
	}

	/*
	 * If this is a synchronous mount, make sure that the
	 * create transaction goes to disk before returning to
	 * the user.
	 */
	if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
		xfs_trans_set_sync(tp);

	/*
	 * Attach the dquot(s) to the inodes and modify them incore.
	 * These ids of the inode couldn't have changed since the new
	 * inode has been locked ever since it was created.
	 */
	xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp);

	error = xfs_trans_commit(tp);
	if (error)
		goto out_release_inode;

	xfs_qm_dqrele(udqp);
	xfs_qm_dqrele(gdqp);
	xfs_qm_dqrele(pdqp);

	*ipp = ip;
	return 0;

 out_trans_cancel:
	xfs_trans_cancel(tp);
 out_release_inode:
	/*
	 * Wait until after the current transaction is aborted to finish the
	 * setup of the inode and release the inode.  This prevents recursive
	 * transactions and deadlocks from xfs_inactive.
	 */
	if (ip) {
		xfs_finish_inode_setup(ip);
		xfs_irele(ip);
	}

	xfs_qm_dqrele(udqp);
	xfs_qm_dqrele(gdqp);
	xfs_qm_dqrele(pdqp);

	if (unlock_dp_on_error)
		xfs_iunlock(dp, XFS_ILOCK_EXCL);
	return error;
}