kevin/linux
1
Fork 0
Code

ocfs2: correctly use ocfs2_find_next_zero_bit()

Browse Source 
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>
This commit is contained in:
Joseph Qi 2024-03-14 10:17:13 +08:00 committed by Andrew Morton
parent 0bbac3facb
commit 30dd3478c3
3 changed files with 9 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
fs/ocfs2/localalloc.c
View File

@ -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;
}

2
fs/ocfs2/reservations.c
View File

@ -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;

6
fs/ocfs2/suballoc.c
View File

@ -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! */