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| author | John Garry <john.g.garry@oracle.com> | 2024-05-02 12:08:26 +0200 |
|---|---|---|
| committer | Chandan Babu R <chandanbabu@kernel.org> | 2024-05-27 12:24:24 +0200 |
| commit | b33874fb7f28326380562f208d948bab785fbd6f (patch) | |
| tree | 7f276483793494f6cc70b1431f7ec66e33ff5382 | |
| parent | xfs: Clear W=1 warning in xfs_iwalk_run_callbacks() (diff) | |
| download | linux-b33874fb7f28326380562f208d948bab785fbd6f.tar.xz linux-b33874fb7f28326380562f208d948bab785fbd6f.zip | |
xfs: Stop using __maybe_unused in xfs_alloc.c
In both xfs_alloc_cur_finish() and xfs_alloc_ag_vextent_exact(), local
variable @afg is tagged as __maybe_unused. Otherwise an unused variable
warning would be generated for when building with W=1 and CONFIG_XFS_DEBUG
unset. In both cases, the variable is unused as it is only referenced in
an ASSERT() call, which is compiled out (in this config).
It is generally a poor programming style to use __maybe_unused for
variables.
The ASSERT() call is to verify that agbno of the end of the extent is
within bounds for both functions. @afg is used as an intermediate variable
to find the AG length.
However xfs_verify_agbext() already exists to verify a valid extent range.
The arguments for calling xfs_verify_agbext() are already available, so use
that instead.
An advantage of using xfs_verify_agbext() is that it verifies that both the
start and the end of the extent are within the bounds of the AG and
catches overflows.
Suggested-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>
| -rw-r--r-- | fs/xfs/libxfs/xfs_alloc.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c index 6cb8b2ddc541..6c55a6e88eba 100644 --- a/fs/xfs/libxfs/xfs_alloc.c +++ b/fs/xfs/libxfs/xfs_alloc.c @@ -1008,13 +1008,12 @@ xfs_alloc_cur_finish( struct xfs_alloc_arg *args, struct xfs_alloc_cur *acur) { - struct xfs_agf __maybe_unused *agf = args->agbp->b_addr; int error; ASSERT(acur->cnt && acur->bnolt); ASSERT(acur->bno >= acur->rec_bno); ASSERT(acur->bno + acur->len <= acur->rec_bno + acur->rec_len); - ASSERT(acur->rec_bno + acur->rec_len <= be32_to_cpu(agf->agf_length)); + ASSERT(xfs_verify_agbext(args->pag, acur->rec_bno, acur->rec_len)); error = xfs_alloc_fixup_trees(acur->cnt, acur->bnolt, acur->rec_bno, acur->rec_len, acur->bno, acur->len, 0); @@ -1217,7 +1216,6 @@ STATIC int /* error */ xfs_alloc_ag_vextent_exact( xfs_alloc_arg_t *args) /* allocation argument structure */ { - struct xfs_agf __maybe_unused *agf = args->agbp->b_addr; struct xfs_btree_cur *bno_cur;/* by block-number btree cursor */ struct xfs_btree_cur *cnt_cur;/* by count btree cursor */ int error; @@ -1297,7 +1295,7 @@ xfs_alloc_ag_vextent_exact( */ cnt_cur = xfs_cntbt_init_cursor(args->mp, args->tp, args->agbp, args->pag); - ASSERT(args->agbno + args->len <= be32_to_cpu(agf->agf_length)); + ASSERT(xfs_verify_agbext(args->pag, args->agbno, args->len)); error = xfs_alloc_fixup_trees(cnt_cur, bno_cur, fbno, flen, args->agbno, args->len, XFSA_FIXUP_BNO_OK); if (error) { |