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Code Issues Releases Wiki Activity

io_uring: defer alloc_hint update to io_file_bitmap_set()

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io_file_bitmap_get() returns a free bitmap slot, but if it isn't
used later, such as io_queue_rsrc_removal() returns error, in this
case, we should not update alloc_hint at all, which still should
be considered as a valid candidate for next io_file_bitmap_get()
calls.

To fix this issue, only update alloc_hint in io_file_bitmap_set().

Signed-off-by: Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220528015109.48039-1-xiaoguang.wang@linux.alibaba.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Xiaoguang Wang 2022-05-28 09:51:09 +08:00 committed by Jens Axboe
parent 8c71fe7502
commit 4278a0deb1
1 changed files with 3 additions and 8 deletions
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11
fs/io_uring.c
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@ -5419,15 +5419,11 @@ static int io_file_bitmap_get(struct io_ring_ctx *ctx)
unsigned long nr = ctx->nr_user_files;
int ret;
if (table->alloc_hint >= nr)
table->alloc_hint = 0;
do {
ret = find_next_zero_bit(table->bitmap, nr, table->alloc_hint);
if (ret != nr) {
table->alloc_hint = ret + 1;
if (ret != nr)
return ret;
}
if (!table->alloc_hint)
break;
@ -9682,8 +9678,7 @@ static inline void io_file_bitmap_set(struct io_file_table *table, int bit)
{
WARN_ON_ONCE(test_bit(bit, table->bitmap));
__set_bit(bit, table->bitmap);
if (bit == table->alloc_hint)
table->alloc_hint++;
table->alloc_hint = bit + 1;
}
static inline void io_file_bitmap_clear(struct io_file_table *table, int bit)