[PATCH 6.9 142/374] ocfs2: correctly use ocfs2_find_next_zero_bit()

Greg Kroah-Hartman
2024-06-06T14:09:51Z

From: Joseph Qi <joseph.qi@linux.alibaba.com>

[ Upstream commit 30dd3478c3cd7d01cc5afc4952e885ba4eefb730 ]

If no bits are zero, ocfs2_find_next_zero_bit() will return max size, so
check the return value with -1 is meaningless. Correct this usage and
cleanup the code.

Link: https://lkml.kernel.org/r/20240314021713.240796-1-joseph.qi@linux.alibaba.com
Signed-off-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Reviewed-by: Heming Zhao <heming.zhao@suse.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Stable-dep-of: 28d2188709d9 ("selftests/harness: use 1024 in place of LINE_MAX")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/ocfs2/localalloc.c | 19 ++++++-------------
fs/ocfs2/reservations.c | 2 +-
fs/ocfs2/suballoc.c | 6 ++----
3 files changed, 9 insertions(+), 18 deletions(-)

diff --git a/fs/ocfs2/localalloc.c b/fs/ocfs2/localalloc.c
index c803c10dd97ef..33aeaaa056d70 100644
--- a/fs/ocfs2/localalloc.c
+++ b/fs/ocfs2/localalloc.c
@@ -863,14 +863,8 @@ static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,

numfound = bitoff = startoff = 0;
left = le32_to_cpu(alloc->id1.bitmap1.i_total);
- while ((bitoff = ocfs2_find_next_zero_bit(bitmap, left, startoff)) != -1) {
- if (bitoff == left) {
- /* mlog(0, "bitoff (%d) == left", bitoff); */
- break;
- }
- /* mlog(0, "Found a zero: bitoff = %d, startoff = %d, "
- "numfound = %d\n", bitoff, startoff, numfound);*/
-
+ while ((bitoff = ocfs2_find_next_zero_bit(bitmap, left, startoff)) <
+ left) {
/* Ok, we found a zero bit... is it contig. or do we
* start over?*/
if (bitoff == startoff) {
@@ -976,9 +970,9 @@ static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
start = count = 0;
left = le32_to_cpu(alloc->id1.bitmap1.i_total);

- while ((bit_off = ocfs2_find_next_zero_bit(bitmap, left, start))
- != -1) {
- if ((bit_off < left) && (bit_off == start)) {
+ while ((bit_off = ocfs2_find_next_zero_bit(bitmap, left, start)) <
+ left) {
+ if (bit_off == start) {
count++;
start++;
continue;
@@ -1002,8 +996,7 @@ static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
goto bail;
}
}
- if (bit_off >= left)
- break;
+
count = 1;
start = bit_off + 1;
}
diff --git a/fs/ocfs2/reservations.c b/fs/ocfs2/reservations.c
index a9d1296d736dc..1fe61974d9f02 100644
--- a/fs/ocfs2/reservations.c
+++ b/fs/ocfs2/reservations.c
@@ -414,7 +414,7 @@ static int ocfs2_resmap_find_free_bits(struct ocfs2_reservation_map *resmap,

start = search_start;
while ((offset = ocfs2_find_next_zero_bit(bitmap, resmap->m_bitmap_len,
- start)) != -1) {
+ start)) < resmap->m_bitmap_len) {
/* Search reached end of the region */
if (offset >= (search_start + search_len))
break;
diff --git a/fs/ocfs2/suballoc.c b/fs/ocfs2/suballoc.c
index 166c8918c825a..961998415308d 100644
--- a/fs/ocfs2/suballoc.c
+++ b/fs/ocfs2/suballoc.c
@@ -1290,10 +1290,8 @@ static int ocfs2_block_group_find_clear_bits(struct ocfs2_super *osb,
found = start = best_offset = best_size = 0;
bitmap = bg->bg_bitmap;

- while((offset = ocfs2_find_next_zero_bit(bitmap, total_bits, start)) != -1) {
- if (offset == total_bits)
- break;
-
+ while ((offset = ocfs2_find_next_zero_bit(bitmap, total_bits, start)) <
+ total_bits) {
if (!ocfs2_test_bg_bit_allocatable(bg_bh, offset)) {
/* We found a zero, but we can't use it as it
* hasn't been put to disk yet! */
--
2.43.0