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cf9cdaea6e
Short writes can happen, too, not just short reads. The difference to
aio=native is that the kernel will actually retry the tail of short
requests internally already -- so it is harder to reproduce. But if the
tail of a short request returns an error to the kernel, we will see it
in userspace still. To reproduce this, apply the following patch on top
of the one shown in HEAD^ (again %s/escaped // to apply):
escaped diff --git a/block/export/fuse.c b/block/export/fuse.c
escaped index 67dc50a412..2b98489a32 100644
escaped --- a/block/export/fuse.c
escaped +++ b/block/export/fuse.c
@@ -1059,8 +1059,15 @@ fuse_co_read(FuseExport *exp, void **bufptr, uint64_t offset, uint32_t size)
int64_t blk_len;
void *buf;
int ret;
+ static uint32_t error_size;
- size = MIN(size, 4096);
+ if (error_size == size) {
+ error_size = 0;
+ return -EIO;
+ } else if (size > 4096) {
+ error_size = size - 4096;
+ size = 4096;
+ }
/* Limited by max_read, should not happen */
if (size > FUSE_MAX_READ_BYTES) {
@@ -1111,8 +1118,15 @@ fuse_co_write(FuseExport *exp, struct fuse_write_out *out,
{
int64_t blk_len;
int ret;
+ static uint32_t error_size;
- size = MIN(size, 4096);
+ if (error_size == size) {
+ error_size = 0;
+ return -EIO;
+ } else if (size > 4096) {
+ error_size = size - 4096;
+ size = 4096;
+ }
QEMU_BUILD_BUG_ON(FUSE_MAX_WRITE_BYTES > BDRV_REQUEST_MAX_BYTES);
/* Limited by max_write, should not happen */
I know this is a bit artificial because to produce this, there must be
an I/O error somewhere anyway, but if it does happen, qemu will
understand it to mean ENOSPC for short writes, which is incorrect. So I
believe we need to resubmit the tail to maybe have it succeed now, or at
least get the correct error code.
Reproducer as before:
$ ./qemu-img create -f raw test.raw 8k
Formatting 'test.raw', fmt=raw size=8192
$ ./qemu-io -f raw -c 'write -P 42 0 8k' test.raw
wrote 8192/8192 bytes at offset 0
8 KiB, 1 ops; 00.00 sec (64.804 MiB/sec and 8294.9003 ops/sec)
$ hexdump -C test.raw
00000000 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a |****************|
*
00002000
$ storage-daemon/qemu-storage-daemon \
--blockdev file,node-name=test,filename=test.raw \
--export fuse,id=exp,node-name=test,mountpoint=test.raw,writable=true
$ ./qemu-io --image-opts -c 'read -P 23 0 8k' \
driver=file,filename=test.raw,cache.direct=on,aio=io_uring
read 8192/8192 bytes at offset 0
8 KiB, 1 ops; 00.00 sec (58.481 MiB/sec and 7485.5342 ops/sec)
$ ./qemu-io --image-opts -c 'write -P 23 0 8k' \
driver=file,filename=test.raw,cache.direct=on,aio=io_uring
write failed: No space left on device
$ hexdump -C test.raw
00000000 17 17 17 17 17 17 17 17 17 17 17 17 17 17 17 17 |................|
*
00001000 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a |****************|
*
00002000
So short reads already work (because there is code for that), but short
writes incorrectly produce ENOSPC. This patch fixes that by
resubmitting not only the tail of short reads but short writes also.
(And this patch uses the opportunity to make it so qemu_iovec_destroy()
is called only if req->resubmit_qiov.iov is non-NULL. Functionally a
non-op, but this is how the code generally checks whether the
resubmit_qiov has been set up or not.)
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Hanna Czenczek <hreitz@redhat.com>
Message-ID: <20260324084338.37453-4-hreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
213 lines
15 KiB
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213 lines
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# See docs/devel/tracing.rst for syntax documentation.
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# ../block.c
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bdrv_open_common(void *bs, const char *filename, int flags, const char *format_name) "bs %p filename \"%s\" flags 0x%x format_name \"%s\""
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bdrv_lock_medium(void *bs, bool locked) "bs %p locked %d"
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# block-backend.c
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blk_co_preadv(void *blk, void *bs, int64_t offset, int64_t bytes, int flags) "blk %p bs %p offset %"PRId64" bytes %" PRId64 " flags 0x%x"
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blk_co_pwritev(void *blk, void *bs, int64_t offset, int64_t bytes, int flags) "blk %p bs %p offset %"PRId64" bytes %" PRId64 " flags 0x%x"
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blk_root_attach(void *child, void *blk, void *bs) "child %p blk %p bs %p"
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blk_root_detach(void *child, void *blk, void *bs) "child %p blk %p bs %p"
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# io.c
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bdrv_co_preadv_part(void *bs, int64_t offset, int64_t bytes, unsigned int flags) "bs %p offset %" PRId64 " bytes %" PRId64 " flags 0x%x"
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bdrv_co_pwritev_part(void *bs, int64_t offset, int64_t bytes, unsigned int flags) "bs %p offset %" PRId64 " bytes %" PRId64 " flags 0x%x"
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bdrv_co_pwrite_zeroes(void *bs, int64_t offset, int64_t bytes, int flags) "bs %p offset %" PRId64 " bytes %" PRId64 " flags 0x%x"
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bdrv_co_do_copy_on_readv(void *bs, int64_t offset, int64_t bytes, int64_t cluster_offset, int64_t cluster_bytes) "bs %p offset %" PRId64 " bytes %" PRId64 " cluster_offset %" PRId64 " cluster_bytes %" PRId64
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bdrv_co_copy_range_from(void *src, int64_t src_offset, void *dst, int64_t dst_offset, int64_t bytes, int read_flags, int write_flags) "src %p offset %" PRId64 " dst %p offset %" PRId64 " bytes %" PRId64 " rw flags 0x%x 0x%x"
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bdrv_co_copy_range_to(void *src, int64_t src_offset, void *dst, int64_t dst_offset, int64_t bytes, int read_flags, int write_flags) "src %p offset %" PRId64 " dst %p offset %" PRId64 " bytes %" PRId64 " rw flags 0x%x 0x%x"
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# stream.c
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stream_one_iteration(void *s, int64_t offset, uint64_t bytes, int is_allocated) "s %p offset %" PRId64 " bytes %" PRIu64 " is_allocated %d"
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stream_start(void *bs, void *base, void *s) "bs %p base %p s %p"
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# commit.c
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commit_one_iteration(void *s, int64_t offset, uint64_t bytes, int is_allocated) "s %p offset %" PRId64 " bytes %" PRIu64 " is_allocated %d"
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commit_start(void *bs, void *base, void *top, void *s) "bs %p base %p top %p s %p"
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# mirror.c
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mirror_start(void *bs, void *s, void *opaque) "bs %p s %p opaque %p"
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mirror_restart_iter(void *s, int64_t cnt) "s %p dirty count %"PRId64
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mirror_before_flush(void *s) "s %p"
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mirror_before_drain(void *s, int64_t cnt) "s %p dirty count %"PRId64
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mirror_before_sleep(void *s, int64_t cnt, int synced, uint64_t delay_ns) "s %p dirty count %"PRId64" synced %d delay %"PRIu64"ns"
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mirror_one_iteration(void *s, int64_t offset, uint64_t bytes) "s %p offset %" PRId64 " bytes %" PRIu64
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mirror_iteration_done(void *s, int64_t offset, uint64_t bytes, int ret) "s %p offset %" PRId64 " bytes %" PRIu64 " ret %d"
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mirror_yield(void *s, int64_t cnt, int buf_free_count, int in_flight) "s %p dirty count %"PRId64" free buffers %d in_flight %d"
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mirror_yield_in_flight(void *s, int64_t offset, int in_flight) "s %p offset %" PRId64 " in_flight %d"
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# backup.c
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backup_do_cow_enter(void *job, int64_t start, int64_t offset, uint64_t bytes) "job %p start %" PRId64 " offset %" PRId64 " bytes %" PRIu64
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backup_do_cow_return(void *job, int64_t offset, uint64_t bytes, int ret) "job %p offset %" PRId64 " bytes %" PRIu64 " ret %d"
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# block-copy.c
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block_copy_skip_range(void *bcs, int64_t start, uint64_t bytes) "bcs %p start %"PRId64" bytes %"PRId64
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block_copy_process(void *bcs, int64_t start) "bcs %p start %"PRId64
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block_copy_copy_range_fail(void *bcs, int64_t start, int ret) "bcs %p start %"PRId64" ret %d"
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block_copy_read_fail(void *bcs, int64_t start, int ret) "bcs %p start %"PRId64" ret %d"
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block_copy_write_fail(void *bcs, int64_t start, int ret) "bcs %p start %"PRId64" ret %d"
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block_copy_write_zeroes_fail(void *bcs, int64_t start, int ret) "bcs %p start %"PRId64" ret %d"
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# ../blockdev.c
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qmp_block_job_cancel(void *job) "job %p"
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qmp_block_job_pause(void *job) "job %p"
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qmp_block_job_resume(void *job) "job %p"
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qmp_block_job_complete(void *job) "job %p"
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qmp_block_job_finalize(void *job) "job %p"
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qmp_block_job_dismiss(void *job) "job %p"
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qmp_block_stream(void *bs) "bs %p"
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# file-win32.c
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file_paio_submit(void *acb, void *opaque, int64_t offset, int count, int type) "acb %p opaque %p offset %"PRId64" count %d type %d"
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# io_uring.c
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luring_cqe_handler(void *req, int ret) "req %p ret %d"
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luring_co_submit(void *bs, void *req, int fd, uint64_t offset, size_t nbytes, int type) "bs %p req %p fd %d offset %" PRId64 " nbytes %zd type %d"
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luring_resubmit_short_io(void *req, int ndone) "req %p ndone %d"
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# qcow2.c
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qcow2_add_task(void *co, void *bs, void *pool, const char *action, int cluster_type, uint64_t host_offset, uint64_t offset, uint64_t bytes, void *qiov, size_t qiov_offset) "co %p bs %p pool %p: %s: cluster_type %d file_cluster_offset %" PRIu64 " offset %" PRIu64 " bytes %" PRIu64 " qiov %p qiov_offset %zu"
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qcow2_writev_start_req(void *co, int64_t offset, int64_t bytes) "co %p offset 0x%" PRIx64 " bytes %" PRId64
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qcow2_writev_done_req(void *co, int ret) "co %p ret %d"
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qcow2_writev_start_part(void *co) "co %p"
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qcow2_writev_done_part(void *co, int cur_bytes) "co %p cur_bytes %d"
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qcow2_writev_data(void *co, uint64_t offset) "co %p offset 0x%" PRIx64
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qcow2_pwrite_zeroes_start_req(void *co, int64_t offset, int64_t bytes) "co %p offset 0x%" PRIx64 " bytes %" PRId64
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qcow2_pwrite_zeroes(void *co, int64_t offset, int64_t bytes) "co %p offset 0x%" PRIx64 " bytes %" PRId64
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qcow2_skip_cow(void *co, uint64_t offset, int nb_clusters) "co %p offset 0x%" PRIx64 " nb_clusters %d"
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# qcow2-cluster.c
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qcow2_alloc_clusters_offset(void *co, uint64_t offset, int bytes) "co %p offset 0x%" PRIx64 " bytes %d"
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qcow2_handle_copied(void *co, uint64_t guest_offset, uint64_t host_offset, uint64_t bytes) "co %p guest_offset 0x%" PRIx64 " host_offset 0x%" PRIx64 " bytes 0x%" PRIx64
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qcow2_handle_alloc(void *co, uint64_t guest_offset, uint64_t host_offset, uint64_t bytes) "co %p guest_offset 0x%" PRIx64 " host_offset 0x%" PRIx64 " bytes 0x%" PRIx64
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qcow2_do_alloc_clusters_offset(void *co, uint64_t guest_offset, uint64_t host_offset, int nb_clusters) "co %p guest_offset 0x%" PRIx64 " host_offset 0x%" PRIx64 " nb_clusters %d"
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qcow2_cluster_alloc_phys(void *co) "co %p"
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qcow2_cluster_link_l2(void *co, int nb_clusters) "co %p nb_clusters %d"
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qcow2_l2_allocate(void *bs, int l1_index) "bs %p l1_index %d"
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qcow2_l2_allocate_get_empty(void *bs, int l1_index) "bs %p l1_index %d"
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qcow2_l2_allocate_write_l2(void *bs, int l1_index) "bs %p l1_index %d"
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qcow2_l2_allocate_write_l1(void *bs, int l1_index) "bs %p l1_index %d"
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qcow2_l2_allocate_done(void *bs, int l1_index, int ret) "bs %p l1_index %d ret %d"
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# qcow2-cache.c
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qcow2_cache_get(void *co, int c, uint64_t offset, bool read_from_disk) "co %p is_l2_cache %d offset 0x%" PRIx64 " read_from_disk %d"
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qcow2_cache_get_replace_entry(void *co, int c, int i) "co %p is_l2_cache %d index %d"
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qcow2_cache_get_read(void *co, int c, int i) "co %p is_l2_cache %d index %d"
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qcow2_cache_get_done(void *co, int c, int i) "co %p is_l2_cache %d index %d"
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qcow2_cache_flush(void *co, int c) "co %p is_l2_cache %d"
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qcow2_cache_entry_flush(void *co, int c, int i) "co %p is_l2_cache %d index %d"
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# qcow2-refcount.c
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qcow2_process_discards_failed_region(uint64_t offset, uint64_t bytes, int ret) "offset 0x%" PRIx64 " bytes 0x%" PRIx64 " ret %d"
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# qed-l2-cache.c
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qed_alloc_l2_cache_entry(void *l2_cache, void *entry) "l2_cache %p entry %p"
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qed_unref_l2_cache_entry(void *entry, int ref) "entry %p ref %d"
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qed_find_l2_cache_entry(void *l2_cache, void *entry, uint64_t offset, int ref) "l2_cache %p entry %p offset %"PRIu64" ref %d"
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# qed-table.c
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qed_read_table(void *s, uint64_t offset, void *table) "s %p offset %"PRIu64" table %p"
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qed_read_table_cb(void *s, void *table, int ret) "s %p table %p ret %d"
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qed_write_table(void *s, uint64_t offset, void *table, unsigned int index, unsigned int n) "s %p offset %"PRIu64" table %p index %u n %u"
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qed_write_table_cb(void *s, void *table, int flush, int ret) "s %p table %p flush %d ret %d"
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# qed.c
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qed_need_check_timer_cb(void *s) "s %p"
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qed_start_need_check_timer(void *s) "s %p"
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qed_cancel_need_check_timer(void *s) "s %p"
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qed_aio_complete(void *s, void *acb, int ret) "s %p acb %p ret %d"
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qed_aio_setup(void *s, void *acb, int64_t sector_num, int nb_sectors, void *opaque, int flags) "s %p acb %p sector_num %"PRId64" nb_sectors %d opaque %p flags 0x%x"
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qed_aio_next_io(void *s, void *acb, int ret, uint64_t cur_pos) "s %p acb %p ret %d cur_pos %"PRIu64
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qed_aio_read_data(void *s, void *acb, int ret, uint64_t offset, size_t len) "s %p acb %p ret %d offset %"PRIu64" len %zu"
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qed_aio_write_data(void *s, void *acb, int ret, uint64_t offset, size_t len) "s %p acb %p ret %d offset %"PRIu64" len %zu"
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qed_aio_write_prefill(void *s, void *acb, uint64_t start, size_t len, uint64_t offset) "s %p acb %p start %"PRIu64" len %zu offset %"PRIu64
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qed_aio_write_postfill(void *s, void *acb, uint64_t start, size_t len, uint64_t offset) "s %p acb %p start %"PRIu64" len %zu offset %"PRIu64
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qed_aio_write_main(void *s, void *acb, int ret, uint64_t offset, size_t len) "s %p acb %p ret %d offset %"PRIu64" len %zu"
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# nvme.c
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nvme_controller_capability_raw(uint64_t value) "0x%08"PRIx64
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nvme_controller_capability(const char *desc, uint64_t value) "%s: %"PRIu64
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nvme_controller_spec_version(uint32_t mjr, uint32_t mnr, uint32_t ter) "Specification supported: %u.%u.%u"
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nvme_kick(void *s, unsigned q_index) "s %p q #%u"
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nvme_dma_flush_queue_wait(void *s) "s %p"
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nvme_error(int cmd_specific, int sq_head, int sqid, int cid, int status) "cmd_specific %d sq_head %d sqid %d cid %d status 0x%x"
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nvme_process_completion(void *s, unsigned q_index, int inflight) "s %p q #%u inflight %d"
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nvme_complete_command(void *s, unsigned q_index, int cid) "s %p q #%u cid %d"
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nvme_submit_command(void *s, unsigned q_index, int cid) "s %p q #%u cid %d"
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nvme_submit_command_raw(int c0, int c1, int c2, int c3, int c4, int c5, int c6, int c7) "%02x %02x %02x %02x %02x %02x %02x %02x"
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nvme_handle_event(void *s) "s %p"
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nvme_poll_queue(void *s, unsigned q_index) "s %p q #%u"
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nvme_prw_aligned(void *s, int is_write, uint64_t offset, uint64_t bytes, int flags, int niov) "s %p is_write %d offset 0x%"PRIx64" bytes %"PRId64" flags %d niov %d"
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nvme_write_zeroes(void *s, uint64_t offset, uint64_t bytes, int flags) "s %p offset 0x%"PRIx64" bytes %"PRId64" flags %d"
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nvme_qiov_unaligned(const void *qiov, int n, void *base, size_t size, int align) "qiov %p n %d base %p size 0x%zx align 0x%x"
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nvme_prw_buffered(void *s, uint64_t offset, uint64_t bytes, int niov, int is_write) "s %p offset 0x%"PRIx64" bytes %"PRId64" niov %d is_write %d"
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nvme_rw_done(void *s, int is_write, uint64_t offset, uint64_t bytes, int ret) "s %p is_write %d offset 0x%"PRIx64" bytes %"PRId64" ret %d"
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nvme_dsm(void *s, int64_t offset, int64_t bytes) "s %p offset 0x%"PRIx64" bytes %"PRId64""
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nvme_dsm_done(void *s, int64_t offset, int64_t bytes, int ret) "s %p offset 0x%"PRIx64" bytes %"PRId64" ret %d"
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nvme_dma_map_flush(void *s) "s %p"
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nvme_free_req_queue_wait(void *s, unsigned q_index) "s %p q #%u"
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nvme_create_queue_pair(unsigned q_index, void *q, size_t size, void *aio_context, int fd) "index %u q %p size %zu aioctx %p fd %d"
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nvme_free_queue_pair(unsigned q_index, void *q, void *cq, void *sq) "index %u q %p cq %p sq %p"
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nvme_cmd_map_qiov(void *s, void *cmd, void *req, void *qiov, int entries) "s %p cmd %p req %p qiov %p entries %d"
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nvme_cmd_map_qiov_pages(void *s, int i, uint64_t page) "s %p page[%d] 0x%"PRIx64
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nvme_cmd_map_qiov_iov(void *s, int i, void *page, int pages) "s %p iov[%d] %p pages %d"
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# iscsi.c
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iscsi_xcopy(void *src_lun, uint64_t src_off, void *dst_lun, uint64_t dst_off, uint64_t bytes, int ret) "src_lun %p offset %"PRIu64" dst_lun %p offset %"PRIu64" bytes %"PRIu64" ret %d"
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# nbd.c
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nbd_parse_blockstatus_compliance(const char *err) "ignoring extra data from non-compliant server: %s"
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nbd_structured_read_compliance(const char *type) "server sent non-compliant unaligned read %s chunk"
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nbd_extended_headers_compliance(const char *type) "server sent non-compliant %s chunk not matching choice of extended headers"
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nbd_read_reply_entry_fail(int ret, const char *err) "ret = %d, err: %s"
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nbd_co_request_fail(uint64_t from, uint64_t len, uint64_t handle, uint16_t flags, uint16_t type, const char *name, int ret, const char *err) "Request failed { .from = %" PRIu64", .len = %" PRIu64 ", .handle = %" PRIu64 ", .flags = 0x%" PRIx16 ", .type = %" PRIu16 " (%s) } ret = %d, err: %s"
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nbd_client_handshake(const char *export_name) "export '%s'"
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nbd_client_handshake_success(const char *export_name) "export '%s'"
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nbd_reconnect_attempt(unsigned in_flight) "in_flight %u"
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nbd_reconnect_attempt_result(int ret, unsigned in_flight) "ret %d in_flight %u"
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# ssh.c
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ssh_restart_coroutine(void *co) "co=%p"
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ssh_flush(void) "fsync"
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ssh_check_host_key_knownhosts(void) "host key OK"
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ssh_connect_to_ssh(char *path, int flags, int mode) "opening file %s flags=0x%x creat_mode=0%o"
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ssh_co_yield(int sock, void *rd_handler, void *wr_handler) "s->sock=%d rd_handler=%p wr_handler=%p"
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ssh_co_yield_back(int sock) "s->sock=%d - back"
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ssh_getlength(int64_t length) "length=%" PRIi64
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ssh_co_create_opts(uint64_t size) "total_size=%" PRIu64
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ssh_read(int64_t offset, size_t size) "offset=%" PRIi64 " size=%zu"
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ssh_read_buf(void *buf, size_t size, size_t actual_size) "sftp_read buf=%p size=%zu (actual size=%zu)"
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ssh_read_return(ssize_t ret, int sftp_err) "sftp_read returned %zd (sftp error=%d)"
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ssh_write(int64_t offset, size_t size) "offset=%" PRIi64 " size=%zu"
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ssh_write_buf(void *buf, size_t size, size_t actual_size) "sftp_write buf=%p size=%zu (actual size=%zu)"
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ssh_write_return(ssize_t ret, int sftp_err) "sftp_write returned %zd (sftp error=%d)"
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ssh_seek(int64_t offset) "seeking to offset=%" PRIi64
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ssh_auth_methods(int methods) "auth methods=0x%x"
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ssh_server_status(int status) "server status=%d"
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# curl.c
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curl_timer_cb(long timeout_ms) "timer callback timeout_ms %ld"
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curl_sock_cb(int action, int fd) "sock action %d on fd %d"
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curl_read_cb(size_t realsize) "just reading %zu bytes"
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curl_header_cb(const char *key, const char *val) "looking at %s: %s"
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curl_open(const char *file) "opening %s"
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curl_open_size(uint64_t size) "size = %" PRIu64
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curl_setup_preadv(uint64_t bytes, uint64_t start, const char *range) "reading %" PRIu64 " at %" PRIu64 " (%s)"
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curl_close(void) "close"
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# file-posix.c
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file_copy_file_range(void *bs, int src, int64_t src_off, int dst, int64_t dst_off, int64_t bytes, int flags, int64_t ret) "bs %p src_fd %d offset %"PRIu64" dst_fd %d offset %"PRIu64" bytes %"PRIu64" flags %d ret %"PRId64
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file_FindEjectableOpticalMedia(const char *media) "Matching using %s"
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file_setup_cdrom(const char *partition) "Using %s as optical disc"
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file_hdev_is_sg(int type, int version) "SG device found: type=%d, version=%d"
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file_flush_fdatasync_failed(int err) "errno %d"
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zbd_zone_report(void *bs, unsigned int nr_zones, int64_t sector) "bs %p report %d zones starting at sector offset 0x%" PRIx64 ""
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zbd_zone_mgmt(void *bs, const char *op_name, int64_t sector, int64_t len) "bs %p %s starts at sector offset 0x%" PRIx64 " over a range of 0x%" PRIx64 " sectors"
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zbd_zone_append(void *bs, int64_t sector) "bs %p append at sector offset 0x%" PRIx64 ""
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zbd_zone_append_complete(void *bs, int64_t sector) "bs %p returns append sector 0x%" PRIx64 ""
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# ssh.c
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sftp_error(const char *op, const char *ssh_err, int ssh_err_code, int sftp_err_code) "%s failed: %s (libssh error code: %d, sftp error code: %d)"
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