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Replace P2ALIGN with P2ALIGN_TYPED and delete P2ALIGN.

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In P2ALIGN, the result would be incorrect when align is unsigned
integer and x is larger than max value of the type of align.
In that case, -(align) would be a positive integer, which means
high bits would be zero and finally stay zero after '&' when
align is converted to a larger integer type.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Youzhong Yang <yyang@mathworks.com>
Signed-off-by: Qiuhao Chen <chenqiuhao1997@gmail.com>
Closes #15940
This commit is contained in:
chenqiuhao1997
2024-05-10 23:47:21 +08:00
committed by Brian Behlendorf
parent 2566592045
commit 9edf6af4ae
16 changed files with 40 additions and 29 deletions
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module/zfs/dmu.c
+3 -2
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@@ -537,7 +537,8 @@ dmu_buf_hold_array_by_dnode(dnode_t *dn, uint64_t offset, uint64_t length,
if (dn->dn_datablkshift) {
int blkshift = dn->dn_datablkshift;
nblks = (P2ROUNDUP(offset + length, 1ULL << blkshift) -
P2ALIGN(offset, 1ULL << blkshift)) >> blkshift;
P2ALIGN_TYPED(offset, 1ULL << blkshift, uint64_t))
>> blkshift;
} else {
if (offset + length > dn->dn_datablksz) {
zfs_panic_recover("zfs: accessing past end of object "
@@ -854,7 +855,7 @@ get_next_chunk(dnode_t *dn, uint64_t *start, uint64_t minimum, uint64_t *l1blks)
}
/* set start to the beginning of this L1 indirect */
*start = P2ALIGN(*start, iblkrange);
*start = P2ALIGN_TYPED(*start, iblkrange, uint64_t);
}
if (*start < minimum)
*start = minimum;