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xfs: add helpers to allocate and initialize fresh btree roots 

Add a pair of helper functions to allocate and initialize fresh btree
roots.  The repair functions will use these as part of recreating
corrupted metadata.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
This commit is contained in:
Darrick J. Wong 2018-05-29 22:18:09 -07:00
parent 0a9633fa2f
commit 73d6b42aa4
2 changed files with 86 additions and 0 deletions
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80
fs/xfs/scrub/repair.c
View File

@ -288,3 +288,83 @@ xfs_repair_calc_ag_resblks(
return max(max(bnobt_sz, inobt_sz), max(rmapbt_sz, refcbt_sz));
}
/* Allocate a block in an AG. */
int
xfs_repair_alloc_ag_block(
struct xfs_scrub_context *sc,
struct xfs_owner_info *oinfo,
xfs_fsblock_t *fsbno,
enum xfs_ag_resv_type resv)
{
struct xfs_alloc_arg args = {0};
xfs_agblock_t bno;
int error;
switch (resv) {
case XFS_AG_RESV_AGFL:
case XFS_AG_RESV_RMAPBT:
error = xfs_alloc_get_freelist(sc->tp, sc->sa.agf_bp, &bno, 1);
if (error)
return error;
if (bno == NULLAGBLOCK)
return -ENOSPC;
xfs_extent_busy_reuse(sc->mp, sc->sa.agno, bno,
1, false);
*fsbno = XFS_AGB_TO_FSB(sc->mp, sc->sa.agno, bno);
if (resv == XFS_AG_RESV_RMAPBT)
xfs_ag_resv_rmapbt_alloc(sc->mp, sc->sa.agno);
return 0;
default:
break;
}
args.tp = sc->tp;
args.mp = sc->mp;
args.oinfo = *oinfo;
args.fsbno = XFS_AGB_TO_FSB(args.mp, sc->sa.agno, 0);
args.minlen = 1;
args.maxlen = 1;
args.prod = 1;
args.type = XFS_ALLOCTYPE_THIS_AG;
args.resv = resv;
error = xfs_alloc_vextent(&args);
if (error)
return error;
if (args.fsbno == NULLFSBLOCK)
return -ENOSPC;
ASSERT(args.len == 1);
*fsbno = args.fsbno;
return 0;
}
/* Initialize a new AG btree root block with zero entries. */
int
xfs_repair_init_btblock(
struct xfs_scrub_context *sc,
xfs_fsblock_t fsb,
struct xfs_buf **bpp,
xfs_btnum_t btnum,
const struct xfs_buf_ops *ops)
{
struct xfs_trans *tp = sc->tp;
struct xfs_mount *mp = sc->mp;
struct xfs_buf *bp;
trace_xfs_repair_init_btblock(mp, XFS_FSB_TO_AGNO(mp, fsb),
XFS_FSB_TO_AGBNO(mp, fsb), btnum);
ASSERT(XFS_FSB_TO_AGNO(mp, fsb) == sc->sa.agno);
bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, XFS_FSB_TO_DADDR(mp, fsb),
XFS_FSB_TO_BB(mp, 1), 0);
xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
xfs_btree_init_block(mp, bp, btnum, 0, 0, sc->sa.agno, 0);
xfs_trans_buf_set_type(tp, bp, XFS_BLFT_BTREE_BUF);
xfs_trans_log_buf(tp, bp, 0, bp->b_length);
bp->b_ops = ops;
*bpp = bp;
return 0;
}

6
fs/xfs/scrub/repair.h
View File

@ -36,6 +36,12 @@ int xfs_repair_roll_ag_trans(struct xfs_scrub_context *sc);
bool xfs_repair_ag_has_space(struct xfs_perag *pag, xfs_extlen_t nr_blocks,
enum xfs_ag_resv_type type);
xfs_extlen_t xfs_repair_calc_ag_resblks(struct xfs_scrub_context *sc);
int xfs_repair_alloc_ag_block(struct xfs_scrub_context *sc,
struct xfs_owner_info *oinfo, xfs_fsblock_t *fsbno,
enum xfs_ag_resv_type resv);
int xfs_repair_init_btblock(struct xfs_scrub_context *sc, xfs_fsblock_t fsb,
struct xfs_buf **bpp, xfs_btnum_t btnum,
const struct xfs_buf_ops *ops);
/* Metadata repairers */