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xfs: return a 64-bit block count from xfs_btree_count_blocks

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With the nrext64 feature enabled, it's possible for a data fork to have
2^48 extent mappings.  Even with a 64k fsblock size, that maps out to
a bmbt containing more than 2^32 blocks.  Therefore, this predicate must
return a u64 count to avoid an integer wraparound that will cause scrub
to do the wrong thing.

It's unlikely that any such filesystem currently exists, because the
incore bmbt would consume more than 64GB of kernel memory on its own,
and so far nobody except me has driven a filesystem that far, judging
from the lack of complaints.

Cc: <stable@vger.kernel.org> # v5.19
Fixes: df9ad5cc7a ("xfs: Introduce macros to represent new maximum extent counts for data/attr forks")
Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2024-12-02 10:57:26 -08:00
parent e1d8602b6c
commit bd27c7bcdc
9 changed files with 17 additions and 15 deletions
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4
fs/xfs/libxfs/xfs_btree.c
View File

@ -5144,7 +5144,7 @@ xfs_btree_count_blocks_helper(
int level,
void *data)
{
xfs_extlen_t *blocks = data;
xfs_filblks_t *blocks = data;
(*blocks)++;
return 0;
@ -5154,7 +5154,7 @@ xfs_btree_count_blocks_helper(
int
xfs_btree_count_blocks(
struct xfs_btree_cur *cur,
xfs_extlen_t *blocks)
xfs_filblks_t *blocks)
{
*blocks = 0;
return xfs_btree_visit_blocks(cur, xfs_btree_count_blocks_helper,

2
fs/xfs/libxfs/xfs_btree.h
View File

@ -484,7 +484,7 @@ typedef int (*xfs_btree_visit_blocks_fn)(struct xfs_btree_cur *cur, int level,
int xfs_btree_visit_blocks(struct xfs_btree_cur *cur,
xfs_btree_visit_blocks_fn fn, unsigned int flags, void *data);
int xfs_btree_count_blocks(struct xfs_btree_cur *cur, xfs_extlen_t *blocks);
int xfs_btree_count_blocks(struct xfs_btree_cur *cur, xfs_filblks_t *blocks);
union xfs_btree_rec *xfs_btree_rec_addr(struct xfs_btree_cur *cur, int n,
struct xfs_btree_block *block);

4
fs/xfs/libxfs/xfs_ialloc_btree.c
View File

@ -744,6 +744,7 @@ xfs_finobt_count_blocks(
{
struct xfs_buf *agbp = NULL;
struct xfs_btree_cur *cur;
xfs_filblks_t blocks;
int error;
error = xfs_ialloc_read_agi(pag, tp, 0, &agbp);
@ -751,9 +752,10 @@ xfs_finobt_count_blocks(
return error;
cur = xfs_finobt_init_cursor(pag, tp, agbp);
error = xfs_btree_count_blocks(cur, tree_blocks);
error = xfs_btree_count_blocks(cur, &blocks);
xfs_btree_del_cursor(cur, error);
xfs_trans_brelse(tp, agbp);
*tree_blocks = blocks;
return error;
}

6
fs/xfs/scrub/agheader.c
View File

@ -458,7 +458,7 @@ xchk_agf_xref_btreeblks(
{
struct xfs_agf *agf = sc->sa.agf_bp->b_addr;
struct xfs_mount *mp = sc->mp;
xfs_agblock_t blocks;
xfs_filblks_t blocks;
xfs_agblock_t btreeblks;
int error;
@ -507,7 +507,7 @@ xchk_agf_xref_refcblks(
struct xfs_scrub *sc)
{
struct xfs_agf *agf = sc->sa.agf_bp->b_addr;
xfs_agblock_t blocks;
xfs_filblks_t blocks;
int error;
if (!sc->sa.refc_cur)
@ -840,7 +840,7 @@ xchk_agi_xref_fiblocks(
struct xfs_scrub *sc)
{
struct xfs_agi *agi = sc->sa.agi_bp->b_addr;
xfs_agblock_t blocks;
xfs_filblks_t blocks;
int error = 0;
if (!xfs_has_inobtcounts(sc->mp))

6
fs/xfs/scrub/agheader_repair.c
View File

@ -256,7 +256,7 @@ xrep_agf_calc_from_btrees(
struct xfs_agf *agf = agf_bp->b_addr;
struct xfs_mount *mp = sc->mp;
xfs_agblock_t btreeblks;
xfs_agblock_t blocks;
xfs_filblks_t blocks;
int error;
/* Update the AGF counters from the bnobt. */
@ -946,7 +946,7 @@ xrep_agi_calc_from_btrees(
if (error)
goto err;
if (xfs_has_inobtcounts(mp)) {
xfs_agblock_t blocks;
xfs_filblks_t blocks;
error = xfs_btree_count_blocks(cur, &blocks);
if (error)
@ -959,7 +959,7 @@ xrep_agi_calc_from_btrees(
agi->agi_freecount = cpu_to_be32(freecount);
if (xfs_has_finobt(mp) && xfs_has_inobtcounts(mp)) {
xfs_agblock_t blocks;
xfs_filblks_t blocks;
cur = xfs_finobt_init_cursor(sc->sa.pag, sc->tp, agi_bp);
error = xfs_btree_count_blocks(cur, &blocks);

2
fs/xfs/scrub/fscounters.c
View File

@ -261,7 +261,7 @@ xchk_fscount_btreeblks(
struct xchk_fscounters *fsc,
xfs_agnumber_t agno)
{
xfs_extlen_t blocks;
xfs_filblks_t blocks;
int error;
error = xchk_ag_init_existing(sc, agno, &sc->sa);

4
fs/xfs/scrub/ialloc.c
View File

@ -650,8 +650,8 @@ xchk_iallocbt_xref_rmap_btreeblks(
struct xfs_scrub *sc)
{
xfs_filblks_t blocks;
xfs_extlen_t inobt_blocks = 0;
xfs_extlen_t finobt_blocks = 0;
xfs_filblks_t inobt_blocks = 0;
xfs_filblks_t finobt_blocks = 0;
int error;
if (!sc->sa.ino_cur || !sc->sa.rmap_cur ||

2
fs/xfs/scrub/refcount.c
View File

@ -491,7 +491,7 @@ xchk_refcount_xref_rmap(
struct xfs_scrub *sc,
xfs_filblks_t cow_blocks)
{
xfs_extlen_t refcbt_blocks = 0;
xfs_filblks_t refcbt_blocks = 0;
xfs_filblks_t blocks;
int error;

2
fs/xfs/xfs_bmap_util.c
View File

@ -103,7 +103,7 @@ xfs_bmap_count_blocks(
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
struct xfs_btree_cur *cur;
xfs_extlen_t btblocks = 0;
xfs_filblks_t btblocks = 0;
int error;
*nextents = 0;