1 files changed, 359 insertions, 141 deletions

diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index a13919a6a36..d2295561570 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -17,35 +17,31 @@
  */
 #include "xfs.h"
 #include "xfs_fs.h"
-#include "xfs_types.h"
-#include "xfs_bit.h"
-#include "xfs_inum.h"
-#include "xfs_log.h"
-#include "xfs_trans.h"
+#include "xfs_shared.h"
+#include "xfs_format.h"
+#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
 #include "xfs_sb.h"
 #include "xfs_ag.h"
-#include "xfs_dir2.h"
-#include "xfs_dmapi.h"
 #include "xfs_mount.h"
-#include "xfs_bmap_btree.h"
-#include "xfs_alloc_btree.h"
-#include "xfs_ialloc_btree.h"
-#include "xfs_dir2_sf.h"
-#include "xfs_attr_sf.h"
-#include "xfs_dinode.h"
+#include "xfs_da_format.h"
+#include "xfs_da_btree.h"
 #include "xfs_inode.h"
+#include "xfs_trans.h"
 #include "xfs_inode_item.h"
-#include "xfs_btree.h"
 #include "xfs_error.h"
+#include "xfs_btree.h"
+#include "xfs_alloc_btree.h"
 #include "xfs_alloc.h"
 #include "xfs_ialloc.h"
 #include "xfs_fsops.h"
 #include "xfs_itable.h"
 #include "xfs_trans_space.h"
 #include "xfs_rtalloc.h"
-#include "xfs_rw.h"
-#include "xfs_filestream.h"
 #include "xfs_trace.h"
+#include "xfs_log.h"
+#include "xfs_dinode.h"
+#include "xfs_filestream.h"
 
 /*
  * File system operations
@@ -57,6 +53,9 @@ xfs_fs_geometry(
 	xfs_fsop_geom_t		*geo,
 	int			new_version)
 {
+
+	memset(geo, 0, sizeof(*geo));
+
 	geo->blocksize = mp->m_sb.sb_blocksize;
 	geo->rtextsize = mp->m_sb.sb_rextsize;
 	geo->agblocks = mp->m_sb.sb_agblocks;
@@ -77,23 +76,18 @@ xfs_fs_geometry(
 	}
 	if (new_version >= 3) {
 		geo->version = XFS_FSOP_GEOM_VERSION;
-		geo->flags =
+		geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK |
+			     XFS_FSOP_GEOM_FLAGS_DIRV2 |
 			(xfs_sb_version_hasattr(&mp->m_sb) ?
 				XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
-			(xfs_sb_version_hasnlink(&mp->m_sb) ?
-				XFS_FSOP_GEOM_FLAGS_NLINK : 0) |
 			(xfs_sb_version_hasquota(&mp->m_sb) ?
 				XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
 			(xfs_sb_version_hasalign(&mp->m_sb) ?
 				XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
 			(xfs_sb_version_hasdalign(&mp->m_sb) ?
 				XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
-			(xfs_sb_version_hasshared(&mp->m_sb) ?
-				XFS_FSOP_GEOM_FLAGS_SHARED : 0) |
 			(xfs_sb_version_hasextflgbit(&mp->m_sb) ?
 				XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
-			(xfs_sb_version_hasdirv2(&mp->m_sb) ?
-				XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) |
 			(xfs_sb_version_hassector(&mp->m_sb) ?
 				XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
 			(xfs_sb_version_hasasciici(&mp->m_sb) ?
@@ -101,11 +95,19 @@ xfs_fs_geometry(
 			(xfs_sb_version_haslazysbcount(&mp->m_sb) ?
 				XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
 			(xfs_sb_version_hasattr2(&mp->m_sb) ?
-				XFS_FSOP_GEOM_FLAGS_ATTR2 : 0);
+				XFS_FSOP_GEOM_FLAGS_ATTR2 : 0) |
+			(xfs_sb_version_hasprojid32bit(&mp->m_sb) ?
+				XFS_FSOP_GEOM_FLAGS_PROJID32 : 0) |
+			(xfs_sb_version_hascrc(&mp->m_sb) ?
+				XFS_FSOP_GEOM_FLAGS_V5SB : 0) |
+			(xfs_sb_version_hasftype(&mp->m_sb) ?
+				XFS_FSOP_GEOM_FLAGS_FTYPE : 0) |
+			(xfs_sb_version_hasfinobt(&mp->m_sb) ?
+				XFS_FSOP_GEOM_FLAGS_FINOBT : 0);
 		geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
 				mp->m_sb.sb_logsectsize : BBSIZE;
 		geo->rtsectsize = mp->m_sb.sb_blocksize;
-		geo->dirblocksize = mp->m_dirblksize;
+		geo->dirblocksize = mp->m_dir_geo->blksize;
 	}
 	if (new_version >= 4) {
 		geo->flags |=
@@ -116,22 +118,44 @@ xfs_fs_geometry(
 	return 0;
 }
 
+static struct xfs_buf *
+xfs_growfs_get_hdr_buf(
+	struct xfs_mount	*mp,
+	xfs_daddr_t		blkno,
+	size_t			numblks,
+	int			flags,
+	const struct xfs_buf_ops *ops)
+{
+	struct xfs_buf		*bp;
+
+	bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
+	if (!bp)
+		return NULL;
+
+	xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
+	bp->b_bn = blkno;
+	bp->b_maps[0].bm_bn = blkno;
+	bp->b_ops = ops;
+
+	return bp;
+}
+
 static int
 xfs_growfs_data_private(
 	xfs_mount_t		*mp,		/* mount point for filesystem */
 	xfs_growfs_data_t	*in)		/* growfs data input struct */
 {
 	xfs_agf_t		*agf;
+	struct xfs_agfl		*agfl;
 	xfs_agi_t		*agi;
 	xfs_agnumber_t		agno;
 	xfs_extlen_t		agsize;
 	xfs_extlen_t		tmpsize;
 	xfs_alloc_rec_t		*arec;
-	struct xfs_btree_block	*block;
 	xfs_buf_t		*bp;
 	int			bucket;
 	int			dpct;
-	int			error;
+	int			error, saved_error = 0;
 	xfs_agnumber_t		nagcount;
 	xfs_agnumber_t		nagimax = 0;
 	xfs_rfsblock_t		nb, nb_mod;
@@ -148,12 +172,16 @@ xfs_growfs_data_private(
 	if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
 		return error;
 	dpct = pct - mp->m_sb.sb_imax_pct;
-	error = xfs_read_buf(mp, mp->m_ddev_targp,
-			XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
-			XFS_FSS_TO_BB(mp, 1), 0, &bp);
-	if (error)
+	bp = xfs_buf_read_uncached(mp->m_ddev_targp,
+				XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
+				XFS_FSS_TO_BB(mp, 1), 0, NULL);
+	if (!bp)
+		return EIO;
+	if (bp->b_error) {
+		error = bp->b_error;
+		xfs_buf_relse(bp);
 		return error;
-	ASSERT(bp);
+	}
 	xfs_buf_relse(bp);
 
 	new = nb;	/* use new as a temporary here */
@@ -167,45 +195,45 @@ xfs_growfs_data_private(
 	}
 	new = nb - mp->m_sb.sb_dblocks;
 	oagcount = mp->m_sb.sb_agcount;
-	if (nagcount > oagcount) {
-		void *new_perag, *old_perag;
-
-		xfs_filestream_flush(mp);
-
-		new_perag = kmem_zalloc(sizeof(xfs_perag_t) * nagcount,
-					KM_MAYFAIL);
-		if (!new_perag)
-			return XFS_ERROR(ENOMEM);
-
-		down_write(&mp->m_peraglock);
-		memcpy(new_perag, mp->m_perag, sizeof(xfs_perag_t) * oagcount);
-		old_perag = mp->m_perag;
-		mp->m_perag = new_perag;
 
-		mp->m_flags |= XFS_MOUNT_32BITINODES;
-		nagimax = xfs_initialize_perag(mp, nagcount);
-		up_write(&mp->m_peraglock);
-
-		kmem_free(old_perag);
+	/* allocate the new per-ag structures */
+	if (nagcount > oagcount) {
+		error = xfs_initialize_perag(mp, nagcount, &nagimax);
+		if (error)
+			return error;
 	}
+
 	tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
 	tp->t_flags |= XFS_TRANS_RESERVE;
-	if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp),
-			XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) {
+	error = xfs_trans_reserve(tp, &M_RES(mp)->tr_growdata,
+				  XFS_GROWFS_SPACE_RES(mp), 0);
+	if (error) {
 		xfs_trans_cancel(tp, 0);
 		return error;
 	}
 
+	/*
+	 * Write new AG headers to disk. Non-transactional, but written
+	 * synchronously so they are completed prior to the growfs transaction
+	 * being logged.
+	 */
 	nfree = 0;
 	for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
+		__be32	*agfl_bno;
+
 		/*
-		 * AG freelist header block
+		 * AG freespace header block
 		 */
-		bp = xfs_buf_get(mp->m_ddev_targp,
-				 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
-				 XFS_FSS_TO_BB(mp, 1), XBF_LOCK | XBF_MAPPED);
+		bp = xfs_growfs_get_hdr_buf(mp,
+				XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
+				XFS_FSS_TO_BB(mp, 1), 0,
+				&xfs_agf_buf_ops);
+		if (!bp) {
+			error = ENOMEM;
+			goto error0;
+		}
+
 		agf = XFS_BUF_TO_AGF(bp);
-		memset(agf, 0, mp->m_sb.sb_sectsize);
 		agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
 		agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
 		agf->agf_seqno = cpu_to_be32(agno);
@@ -226,18 +254,55 @@ xfs_growfs_data_private(
 		tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
 		agf->agf_freeblks = cpu_to_be32(tmpsize);
 		agf->agf_longest = cpu_to_be32(tmpsize);
-		error = xfs_bwrite(mp, bp);
-		if (error) {
+		if (xfs_sb_version_hascrc(&mp->m_sb))
+			uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_uuid);
+
+		error = xfs_bwrite(bp);
+		xfs_buf_relse(bp);
+		if (error)
 			goto error0;
+
+		/*
+		 * AG freelist header block
+		 */
+		bp = xfs_growfs_get_hdr_buf(mp,
+				XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)),
+				XFS_FSS_TO_BB(mp, 1), 0,
+				&xfs_agfl_buf_ops);
+		if (!bp) {
+			error = ENOMEM;
+			goto error0;
+		}
+
+		agfl = XFS_BUF_TO_AGFL(bp);
+		if (xfs_sb_version_hascrc(&mp->m_sb)) {
+			agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
+			agfl->agfl_seqno = cpu_to_be32(agno);
+			uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_uuid);
 		}
+
+		agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp);
+		for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++)
+			agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
+
+		error = xfs_bwrite(bp);
+		xfs_buf_relse(bp);
+		if (error)
+			goto error0;
+
 		/*
 		 * AG inode header block
 		 */
-		bp = xfs_buf_get(mp->m_ddev_targp,
-				 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
-				 XFS_FSS_TO_BB(mp, 1), XBF_LOCK | XBF_MAPPED);
+		bp = xfs_growfs_get_hdr_buf(mp,
+				XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
+				XFS_FSS_TO_BB(mp, 1), 0,
+				&xfs_agi_buf_ops);
+		if (!bp) {
+			error = ENOMEM;
+			goto error0;
+		}
+
 		agi = XFS_BUF_TO_AGI(bp);
-		memset(agi, 0, mp->m_sb.sb_sectsize);
 		agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
 		agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
 		agi->agi_seqno = cpu_to_be32(agno);
@@ -248,75 +313,131 @@ xfs_growfs_data_private(
 		agi->agi_freecount = 0;
 		agi->agi_newino = cpu_to_be32(NULLAGINO);
 		agi->agi_dirino = cpu_to_be32(NULLAGINO);
+		if (xfs_sb_version_hascrc(&mp->m_sb))
+			uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_uuid);
+		if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
+			agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp));
+			agi->agi_free_level = cpu_to_be32(1);
+		}
 		for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
 			agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
-		error = xfs_bwrite(mp, bp);
-		if (error) {
+
+		error = xfs_bwrite(bp);
+		xfs_buf_relse(bp);
+		if (error)
 			goto error0;
-		}
+
 		/*
 		 * BNO btree root block
 		 */
-		bp = xfs_buf_get(mp->m_ddev_targp,
-				 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
-				 BTOBB(mp->m_sb.sb_blocksize),
-				 XBF_LOCK | XBF_MAPPED);
-		block = XFS_BUF_TO_BLOCK(bp);
-		memset(block, 0, mp->m_sb.sb_blocksize);
-		block->bb_magic = cpu_to_be32(XFS_ABTB_MAGIC);
-		block->bb_level = 0;
-		block->bb_numrecs = cpu_to_be16(1);
-		block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
-		block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
-		arec = XFS_ALLOC_REC_ADDR(mp, block, 1);
+		bp = xfs_growfs_get_hdr_buf(mp,
+				XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
+				BTOBB(mp->m_sb.sb_blocksize), 0,
+				&xfs_allocbt_buf_ops);
+
+		if (!bp) {
+			error = ENOMEM;
+			goto error0;
+		}
+
+		if (xfs_sb_version_hascrc(&mp->m_sb))
+			xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1,
+						agno, XFS_BTREE_CRC_BLOCKS);
+		else
+			xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1,
+						agno, 0);
+
+		arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
 		arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
 		arec->ar_blockcount = cpu_to_be32(
 			agsize - be32_to_cpu(arec->ar_startblock));
-		error = xfs_bwrite(mp, bp);
-		if (error) {
+
+		error = xfs_bwrite(bp);
+		xfs_buf_relse(bp);
+		if (error)
 			goto error0;
-		}
+
 		/*
 		 * CNT btree root block
 		 */
-		bp = xfs_buf_get(mp->m_ddev_targp,
-				 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
-				 BTOBB(mp->m_sb.sb_blocksize),
-				 XBF_LOCK | XBF_MAPPED);
-		block = XFS_BUF_TO_BLOCK(bp);
-		memset(block, 0, mp->m_sb.sb_blocksize);
-		block->bb_magic = cpu_to_be32(XFS_ABTC_MAGIC);
-		block->bb_level = 0;
-		block->bb_numrecs = cpu_to_be16(1);
-		block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
-		block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
-		arec = XFS_ALLOC_REC_ADDR(mp, block, 1);
+		bp = xfs_growfs_get_hdr_buf(mp,
+				XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
+				BTOBB(mp->m_sb.sb_blocksize), 0,
+				&xfs_allocbt_buf_ops);
+		if (!bp) {
+			error = ENOMEM;
+			goto error0;
+		}
+
+		if (xfs_sb_version_hascrc(&mp->m_sb))
+			xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1,
+						agno, XFS_BTREE_CRC_BLOCKS);
+		else
+			xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1,
+						agno, 0);
+
+		arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
 		arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
 		arec->ar_blockcount = cpu_to_be32(
 			agsize - be32_to_cpu(arec->ar_startblock));
 		nfree += be32_to_cpu(arec->ar_blockcount);
-		error = xfs_bwrite(mp, bp);
-		if (error) {
+
+		error = xfs_bwrite(bp);
+		xfs_buf_relse(bp);
+		if (error)
 			goto error0;
-		}
+
 		/*
 		 * INO btree root block
 		 */
-		bp = xfs_buf_get(mp->m_ddev_targp,
-				 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
-				 BTOBB(mp->m_sb.sb_blocksize),
-				 XBF_LOCK | XBF_MAPPED);
-		block = XFS_BUF_TO_BLOCK(bp);
-		memset(block, 0, mp->m_sb.sb_blocksize);
-		block->bb_magic = cpu_to_be32(XFS_IBT_MAGIC);
-		block->bb_level = 0;
-		block->bb_numrecs = 0;
-		block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
-		block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
-		error = xfs_bwrite(mp, bp);
-		if (error) {
+		bp = xfs_growfs_get_hdr_buf(mp,
+				XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
+				BTOBB(mp->m_sb.sb_blocksize), 0,
+				&xfs_inobt_buf_ops);
+		if (!bp) {
+			error = ENOMEM;
+			goto error0;
+		}
+
+		if (xfs_sb_version_hascrc(&mp->m_sb))
+			xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0,
+						agno, XFS_BTREE_CRC_BLOCKS);
+		else
+			xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0,
+						agno, 0);
+
+		error = xfs_bwrite(bp);
+		xfs_buf_relse(bp);
+		if (error)
 			goto error0;
+
+		/*
+		 * FINO btree root block
+		 */
+		if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
+			bp = xfs_growfs_get_hdr_buf(mp,
+				XFS_AGB_TO_DADDR(mp, agno, XFS_FIBT_BLOCK(mp)),
+				BTOBB(mp->m_sb.sb_blocksize), 0,
+				&xfs_inobt_buf_ops);
+			if (!bp) {
+				error = ENOMEM;
+				goto error0;
+			}
+
+			if (xfs_sb_version_hascrc(&mp->m_sb))
+				xfs_btree_init_block(mp, bp, XFS_FIBT_CRC_MAGIC,
+						     0, 0, agno,
+						     XFS_BTREE_CRC_BLOCKS);
+			else
+				xfs_btree_init_block(mp, bp, XFS_FIBT_MAGIC, 0,
+						     0, agno, 0);
+
+			error = xfs_bwrite(bp);
+			xfs_buf_relse(bp);
+			if (error)
+				goto error0;
 		}
+
 	}
 	xfs_trans_agblocks_delta(tp, nfree);
 	/*
@@ -359,6 +480,12 @@ xfs_growfs_data_private(
 			goto error0;
 		}
 	}
+
+	/*
+	 * Update changed superblock fields transactionally. These are not
+	 * seen by the rest of the world until the transaction commit applies
+	 * them atomically to the superblock.
+	 */
 	if (nagcount > oagcount)
 		xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
 	if (nb > mp->m_sb.sb_dblocks)
@@ -369,9 +496,9 @@ xfs_growfs_data_private(
 	if (dpct)
 		xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
 	error = xfs_trans_commit(tp, 0);
-	if (error) {
+	if (error)
 		return error;
-	}
+
 	/* New allocation groups fully initialized, so update mount struct */
 	if (nagimax)
 		mp->m_maxagi = nagimax;
@@ -381,32 +508,59 @@ xfs_growfs_data_private(
 		mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
 	} else
 		mp->m_maxicount = 0;
+	xfs_set_low_space_thresholds(mp);
+
+	/* update secondary superblocks. */
 	for (agno = 1; agno < nagcount; agno++) {
-		error = xfs_read_buf(mp, mp->m_ddev_targp,
+		error = 0;
+		/*
+		 * new secondary superblocks need to be zeroed, not read from
+		 * disk as the contents of the new area we are growing into is
+		 * completely unknown.
+		 */
+		if (agno < oagcount) {
+			error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 				  XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
-				  XFS_FSS_TO_BB(mp, 1), 0, &bp);
-		if (error) {
-			xfs_fs_cmn_err(CE_WARN, mp,
-			"error %d reading secondary superblock for ag %d",
-				error, agno);
-			break;
+				  XFS_FSS_TO_BB(mp, 1), 0, &bp,
+				  &xfs_sb_buf_ops);
+		} else {
+			bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
+				  XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
+				  XFS_FSS_TO_BB(mp, 1), 0);
+			if (bp) {
+				bp->b_ops = &xfs_sb_buf_ops;
+				xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
+			} else
+				error = ENOMEM;
 		}
-		xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS);
+
 		/*
-		 * If we get an error writing out the alternate superblocks,
-		 * just issue a warning and continue.  The real work is
-		 * already done and committed.
+		 * If we get an error reading or writing alternate superblocks,
+		 * continue.  xfs_repair chooses the "best" superblock based
+		 * on most matches; if we break early, we'll leave more
+		 * superblocks un-updated than updated, and xfs_repair may
+		 * pick them over the properly-updated primary.
 		 */
-		if (!(error = xfs_bwrite(mp, bp))) {
+		if (error) {
+			xfs_warn(mp,
+		"error %d reading secondary superblock for ag %d",
+				error, agno);
+			saved_error = error;
 			continue;
-		} else {
-			xfs_fs_cmn_err(CE_WARN, mp,
+		}
+		xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS);
+
+		error = xfs_bwrite(bp);
+		xfs_buf_relse(bp);
+		if (error) {
+			xfs_warn(mp,
 		"write error %d updating secondary superblock for ag %d",
 				error, agno);
-			break; /* no point in continuing */
+			saved_error = error;
+			continue;
 		}
 	}
-	return 0;
+	return saved_error ? saved_error : error;
 
  error0:
 	xfs_trans_cancel(tp, XFS_TRANS_ABORT);
@@ -601,39 +755,43 @@ out:
 		 * the extra reserve blocks from the reserve.....
 		 */
 		int error;
-		error = xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS, fdblks_delta, 0);
+		error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
+						 fdblks_delta, 0);
 		if (error == ENOSPC)
 			goto retry;
 	}
 	return 0;
 }
 
+/*
+ * Dump a transaction into the log that contains no real change. This is needed
+ * to be able to make the log dirty or stamp the current tail LSN into the log
+ * during the covering operation.
+ *
+ * We cannot use an inode here for this - that will push dirty state back up
+ * into the VFS and then periodic inode flushing will prevent log covering from
+ * making progress. Hence we log a field in the superblock instead and use a
+ * synchronous transaction to ensure the superblock is immediately unpinned
+ * and can be written back.
+ */
 int
 xfs_fs_log_dummy(
 	xfs_mount_t	*mp)
 {
 	xfs_trans_t	*tp;
-	xfs_inode_t	*ip;
 	int		error;
 
 	tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP);
-	error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0);
+	error = xfs_trans_reserve(tp, &M_RES(mp)->tr_sb, 0, 0);
 	if (error) {
 		xfs_trans_cancel(tp, 0);
 		return error;
 	}
 
-	ip = mp->m_rootip;
-	xfs_ilock(ip, XFS_ILOCK_EXCL);
-
-	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
-	xfs_trans_ihold(tp, ip);
-	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+	/* log the UUID because it is an unchanging field */
+	xfs_mod_sb(tp, XFS_SB_UUID);
 	xfs_trans_set_sync(tp);
-	error = xfs_trans_commit(tp, 0);
-
-	xfs_iunlock(ip, XFS_ILOCK_EXCL);
-	return error;
+	return xfs_trans_commit(tp, 0);
 }
 
 int
@@ -665,3 +823,63 @@ xfs_fs_goingdown(
 
 	return 0;
 }
+
+/*
+ * Force a shutdown of the filesystem instantly while keeping the filesystem
+ * consistent. We don't do an unmount here; just shutdown the shop, make sure
+ * that absolutely nothing persistent happens to this filesystem after this
+ * point.
+ */
+void
+xfs_do_force_shutdown(
+	xfs_mount_t	*mp,
+	int		flags,
+	char		*fname,
+	int		lnnum)
+{
+	int		logerror;
+
+	logerror = flags & SHUTDOWN_LOG_IO_ERROR;
+
+	if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
+		xfs_notice(mp,
+	"%s(0x%x) called from line %d of file %s.  Return address = 0x%p",
+			__func__, flags, lnnum, fname, __return_address);
+	}
+	/*
+	 * No need to duplicate efforts.
+	 */
+	if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
+		return;
+
+	/*
+	 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
+	 * queue up anybody new on the log reservations, and wakes up
+	 * everybody who's sleeping on log reservations to tell them
+	 * the bad news.
+	 */
+	if (xfs_log_force_umount(mp, logerror))
+		return;
+
+	if (flags & SHUTDOWN_CORRUPT_INCORE) {
+		xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
+    "Corruption of in-memory data detected.  Shutting down filesystem");
+		if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
+			xfs_stack_trace();
+	} else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
+		if (logerror) {
+			xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
+		"Log I/O Error Detected.  Shutting down filesystem");
+		} else if (flags & SHUTDOWN_DEVICE_REQ) {
+			xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
+		"All device paths lost.  Shutting down filesystem");
+		} else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
+			xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
+		"I/O Error Detected. Shutting down filesystem");
+		}
+	}
+	if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
+		xfs_alert(mp,
+	"Please umount the filesystem and rectify the problem(s)");
+	}
+}