v4.19.13 snapshot.
diff --git a/fs/xfs/libxfs/xfs_ag.c b/fs/xfs/libxfs/xfs_ag.c
new file mode 100644
index 0000000..9345802
--- /dev/null
+++ b/fs/xfs/libxfs/xfs_ag.c
@@ -0,0 +1,464 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2000-2005 Silicon Graphics, Inc.
+ * Copyright (c) 2018 Red Hat, Inc.
+ * All rights reserved.
+ */
+
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_shared.h"
+#include "xfs_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_sb.h"
+#include "xfs_mount.h"
+#include "xfs_btree.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_rmap_btree.h"
+#include "xfs_alloc.h"
+#include "xfs_ialloc.h"
+#include "xfs_rmap.h"
+#include "xfs_ag.h"
+
+static struct xfs_buf *
+xfs_get_aghdr_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;
+}
+
+/*
+ * Generic btree root block init function
+ */
+static void
+xfs_btroot_init(
+ struct xfs_mount *mp,
+ struct xfs_buf *bp,
+ struct aghdr_init_data *id)
+{
+ xfs_btree_init_block(mp, bp, id->type, 0, 0, id->agno, 0);
+}
+
+/*
+ * Alloc btree root block init functions
+ */
+static void
+xfs_bnoroot_init(
+ struct xfs_mount *mp,
+ struct xfs_buf *bp,
+ struct aghdr_init_data *id)
+{
+ struct xfs_alloc_rec *arec;
+
+ xfs_btree_init_block(mp, bp, XFS_BTNUM_BNO, 0, 1, id->agno, 0);
+ arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
+ arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
+ arec->ar_blockcount = cpu_to_be32(id->agsize -
+ be32_to_cpu(arec->ar_startblock));
+}
+
+static void
+xfs_cntroot_init(
+ struct xfs_mount *mp,
+ struct xfs_buf *bp,
+ struct aghdr_init_data *id)
+{
+ struct xfs_alloc_rec *arec;
+
+ xfs_btree_init_block(mp, bp, XFS_BTNUM_CNT, 0, 1, id->agno, 0);
+ arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
+ arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
+ arec->ar_blockcount = cpu_to_be32(id->agsize -
+ be32_to_cpu(arec->ar_startblock));
+}
+
+/*
+ * Reverse map root block init
+ */
+static void
+xfs_rmaproot_init(
+ struct xfs_mount *mp,
+ struct xfs_buf *bp,
+ struct aghdr_init_data *id)
+{
+ struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
+ struct xfs_rmap_rec *rrec;
+
+ xfs_btree_init_block(mp, bp, XFS_BTNUM_RMAP, 0, 4, id->agno, 0);
+
+ /*
+ * mark the AG header regions as static metadata The BNO
+ * btree block is the first block after the headers, so
+ * it's location defines the size of region the static
+ * metadata consumes.
+ *
+ * Note: unlike mkfs, we never have to account for log
+ * space when growing the data regions
+ */
+ rrec = XFS_RMAP_REC_ADDR(block, 1);
+ rrec->rm_startblock = 0;
+ rrec->rm_blockcount = cpu_to_be32(XFS_BNO_BLOCK(mp));
+ rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_FS);
+ rrec->rm_offset = 0;
+
+ /* account freespace btree root blocks */
+ rrec = XFS_RMAP_REC_ADDR(block, 2);
+ rrec->rm_startblock = cpu_to_be32(XFS_BNO_BLOCK(mp));
+ rrec->rm_blockcount = cpu_to_be32(2);
+ rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG);
+ rrec->rm_offset = 0;
+
+ /* account inode btree root blocks */
+ rrec = XFS_RMAP_REC_ADDR(block, 3);
+ rrec->rm_startblock = cpu_to_be32(XFS_IBT_BLOCK(mp));
+ rrec->rm_blockcount = cpu_to_be32(XFS_RMAP_BLOCK(mp) -
+ XFS_IBT_BLOCK(mp));
+ rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_INOBT);
+ rrec->rm_offset = 0;
+
+ /* account for rmap btree root */
+ rrec = XFS_RMAP_REC_ADDR(block, 4);
+ rrec->rm_startblock = cpu_to_be32(XFS_RMAP_BLOCK(mp));
+ rrec->rm_blockcount = cpu_to_be32(1);
+ rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG);
+ rrec->rm_offset = 0;
+
+ /* account for refc btree root */
+ if (xfs_sb_version_hasreflink(&mp->m_sb)) {
+ rrec = XFS_RMAP_REC_ADDR(block, 5);
+ rrec->rm_startblock = cpu_to_be32(xfs_refc_block(mp));
+ rrec->rm_blockcount = cpu_to_be32(1);
+ rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_REFC);
+ rrec->rm_offset = 0;
+ be16_add_cpu(&block->bb_numrecs, 1);
+ }
+}
+
+/*
+ * Initialise new secondary superblocks with the pre-grow geometry, but mark
+ * them as "in progress" so we know they haven't yet been activated. This will
+ * get cleared when the update with the new geometry information is done after
+ * changes to the primary are committed. This isn't strictly necessary, but we
+ * get it for free with the delayed buffer write lists and it means we can tell
+ * if a grow operation didn't complete properly after the fact.
+ */
+static void
+xfs_sbblock_init(
+ struct xfs_mount *mp,
+ struct xfs_buf *bp,
+ struct aghdr_init_data *id)
+{
+ struct xfs_dsb *dsb = XFS_BUF_TO_SBP(bp);
+
+ xfs_sb_to_disk(dsb, &mp->m_sb);
+ dsb->sb_inprogress = 1;
+}
+
+static void
+xfs_agfblock_init(
+ struct xfs_mount *mp,
+ struct xfs_buf *bp,
+ struct aghdr_init_data *id)
+{
+ struct xfs_agf *agf = XFS_BUF_TO_AGF(bp);
+ xfs_extlen_t tmpsize;
+
+ agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
+ agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
+ agf->agf_seqno = cpu_to_be32(id->agno);
+ agf->agf_length = cpu_to_be32(id->agsize);
+ agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
+ agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
+ agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
+ agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
+ if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
+ agf->agf_roots[XFS_BTNUM_RMAPi] =
+ cpu_to_be32(XFS_RMAP_BLOCK(mp));
+ agf->agf_levels[XFS_BTNUM_RMAPi] = cpu_to_be32(1);
+ agf->agf_rmap_blocks = cpu_to_be32(1);
+ }
+
+ agf->agf_flfirst = cpu_to_be32(1);
+ agf->agf_fllast = 0;
+ agf->agf_flcount = 0;
+ tmpsize = id->agsize - mp->m_ag_prealloc_blocks;
+ agf->agf_freeblks = cpu_to_be32(tmpsize);
+ agf->agf_longest = cpu_to_be32(tmpsize);
+ if (xfs_sb_version_hascrc(&mp->m_sb))
+ uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid);
+ if (xfs_sb_version_hasreflink(&mp->m_sb)) {
+ agf->agf_refcount_root = cpu_to_be32(
+ xfs_refc_block(mp));
+ agf->agf_refcount_level = cpu_to_be32(1);
+ agf->agf_refcount_blocks = cpu_to_be32(1);
+ }
+}
+
+static void
+xfs_agflblock_init(
+ struct xfs_mount *mp,
+ struct xfs_buf *bp,
+ struct aghdr_init_data *id)
+{
+ struct xfs_agfl *agfl = XFS_BUF_TO_AGFL(bp);
+ __be32 *agfl_bno;
+ int bucket;
+
+ if (xfs_sb_version_hascrc(&mp->m_sb)) {
+ agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
+ agfl->agfl_seqno = cpu_to_be32(id->agno);
+ uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_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);
+}
+
+static void
+xfs_agiblock_init(
+ struct xfs_mount *mp,
+ struct xfs_buf *bp,
+ struct aghdr_init_data *id)
+{
+ struct xfs_agi *agi = XFS_BUF_TO_AGI(bp);
+ int bucket;
+
+ agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
+ agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
+ agi->agi_seqno = cpu_to_be32(id->agno);
+ agi->agi_length = cpu_to_be32(id->agsize);
+ agi->agi_count = 0;
+ agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
+ agi->agi_level = cpu_to_be32(1);
+ 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_meta_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);
+}
+
+typedef void (*aghdr_init_work_f)(struct xfs_mount *mp, struct xfs_buf *bp,
+ struct aghdr_init_data *id);
+static int
+xfs_ag_init_hdr(
+ struct xfs_mount *mp,
+ struct aghdr_init_data *id,
+ aghdr_init_work_f work,
+ const struct xfs_buf_ops *ops)
+
+{
+ struct xfs_buf *bp;
+
+ bp = xfs_get_aghdr_buf(mp, id->daddr, id->numblks, 0, ops);
+ if (!bp)
+ return -ENOMEM;
+
+ (*work)(mp, bp, id);
+
+ xfs_buf_delwri_queue(bp, &id->buffer_list);
+ xfs_buf_relse(bp);
+ return 0;
+}
+
+struct xfs_aghdr_grow_data {
+ xfs_daddr_t daddr;
+ size_t numblks;
+ const struct xfs_buf_ops *ops;
+ aghdr_init_work_f work;
+ xfs_btnum_t type;
+ bool need_init;
+};
+
+/*
+ * Prepare new AG headers to be written to disk. We use uncached buffers here,
+ * as it is assumed these new AG headers are currently beyond the currently
+ * valid filesystem address space. Using cached buffers would trip over EOFS
+ * corruption detection alogrithms in the buffer cache lookup routines.
+ *
+ * This is a non-transactional function, but the prepared buffers are added to a
+ * delayed write buffer list supplied by the caller so they can submit them to
+ * disk and wait on them as required.
+ */
+int
+xfs_ag_init_headers(
+ struct xfs_mount *mp,
+ struct aghdr_init_data *id)
+
+{
+ struct xfs_aghdr_grow_data aghdr_data[] = {
+ { /* SB */
+ .daddr = XFS_AG_DADDR(mp, id->agno, XFS_SB_DADDR),
+ .numblks = XFS_FSS_TO_BB(mp, 1),
+ .ops = &xfs_sb_buf_ops,
+ .work = &xfs_sbblock_init,
+ .need_init = true
+ },
+ { /* AGF */
+ .daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGF_DADDR(mp)),
+ .numblks = XFS_FSS_TO_BB(mp, 1),
+ .ops = &xfs_agf_buf_ops,
+ .work = &xfs_agfblock_init,
+ .need_init = true
+ },
+ { /* AGFL */
+ .daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGFL_DADDR(mp)),
+ .numblks = XFS_FSS_TO_BB(mp, 1),
+ .ops = &xfs_agfl_buf_ops,
+ .work = &xfs_agflblock_init,
+ .need_init = true
+ },
+ { /* AGI */
+ .daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGI_DADDR(mp)),
+ .numblks = XFS_FSS_TO_BB(mp, 1),
+ .ops = &xfs_agi_buf_ops,
+ .work = &xfs_agiblock_init,
+ .need_init = true
+ },
+ { /* BNO root block */
+ .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_BNO_BLOCK(mp)),
+ .numblks = BTOBB(mp->m_sb.sb_blocksize),
+ .ops = &xfs_allocbt_buf_ops,
+ .work = &xfs_bnoroot_init,
+ .need_init = true
+ },
+ { /* CNT root block */
+ .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_CNT_BLOCK(mp)),
+ .numblks = BTOBB(mp->m_sb.sb_blocksize),
+ .ops = &xfs_allocbt_buf_ops,
+ .work = &xfs_cntroot_init,
+ .need_init = true
+ },
+ { /* INO root block */
+ .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_IBT_BLOCK(mp)),
+ .numblks = BTOBB(mp->m_sb.sb_blocksize),
+ .ops = &xfs_inobt_buf_ops,
+ .work = &xfs_btroot_init,
+ .type = XFS_BTNUM_INO,
+ .need_init = true
+ },
+ { /* FINO root block */
+ .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_FIBT_BLOCK(mp)),
+ .numblks = BTOBB(mp->m_sb.sb_blocksize),
+ .ops = &xfs_inobt_buf_ops,
+ .work = &xfs_btroot_init,
+ .type = XFS_BTNUM_FINO,
+ .need_init = xfs_sb_version_hasfinobt(&mp->m_sb)
+ },
+ { /* RMAP root block */
+ .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_RMAP_BLOCK(mp)),
+ .numblks = BTOBB(mp->m_sb.sb_blocksize),
+ .ops = &xfs_rmapbt_buf_ops,
+ .work = &xfs_rmaproot_init,
+ .need_init = xfs_sb_version_hasrmapbt(&mp->m_sb)
+ },
+ { /* REFC root block */
+ .daddr = XFS_AGB_TO_DADDR(mp, id->agno, xfs_refc_block(mp)),
+ .numblks = BTOBB(mp->m_sb.sb_blocksize),
+ .ops = &xfs_refcountbt_buf_ops,
+ .work = &xfs_btroot_init,
+ .type = XFS_BTNUM_REFC,
+ .need_init = xfs_sb_version_hasreflink(&mp->m_sb)
+ },
+ { /* NULL terminating block */
+ .daddr = XFS_BUF_DADDR_NULL,
+ }
+ };
+ struct xfs_aghdr_grow_data *dp;
+ int error = 0;
+
+ /* Account for AG free space in new AG */
+ id->nfree += id->agsize - mp->m_ag_prealloc_blocks;
+ for (dp = &aghdr_data[0]; dp->daddr != XFS_BUF_DADDR_NULL; dp++) {
+ if (!dp->need_init)
+ continue;
+
+ id->daddr = dp->daddr;
+ id->numblks = dp->numblks;
+ id->type = dp->type;
+ error = xfs_ag_init_hdr(mp, id, dp->work, dp->ops);
+ if (error)
+ break;
+ }
+ return error;
+}
+
+/*
+ * Extent the AG indicated by the @id by the length passed in
+ */
+int
+xfs_ag_extend_space(
+ struct xfs_mount *mp,
+ struct xfs_trans *tp,
+ struct aghdr_init_data *id,
+ xfs_extlen_t len)
+{
+ struct xfs_owner_info oinfo;
+ struct xfs_buf *bp;
+ struct xfs_agi *agi;
+ struct xfs_agf *agf;
+ int error;
+
+ /*
+ * Change the agi length.
+ */
+ error = xfs_ialloc_read_agi(mp, tp, id->agno, &bp);
+ if (error)
+ return error;
+
+ agi = XFS_BUF_TO_AGI(bp);
+ be32_add_cpu(&agi->agi_length, len);
+ ASSERT(id->agno == mp->m_sb.sb_agcount - 1 ||
+ be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
+ xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
+
+ /*
+ * Change agf length.
+ */
+ error = xfs_alloc_read_agf(mp, tp, id->agno, 0, &bp);
+ if (error)
+ return error;
+
+ agf = XFS_BUF_TO_AGF(bp);
+ be32_add_cpu(&agf->agf_length, len);
+ ASSERT(agf->agf_length == agi->agi_length);
+ xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
+
+ /*
+ * Free the new space.
+ *
+ * XFS_RMAP_OWN_NULL is used here to tell the rmap btree that
+ * this doesn't actually exist in the rmap btree.
+ */
+ xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_NULL);
+ error = xfs_rmap_free(tp, bp, id->agno,
+ be32_to_cpu(agf->agf_length) - len,
+ len, &oinfo);
+ if (error)
+ return error;
+
+ return xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, id->agno,
+ be32_to_cpu(agf->agf_length) - len),
+ len, &oinfo, XFS_AG_RESV_NONE);
+}