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Copy filter: fixed sendfile aio handlers to set ctx->aio.

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Sendfile handlers (aio preload and thread handler) are called within
ctx->output_filter() in ngx_output_chain(), and hence ctx->aio cannot
be set directly in ngx_output_chain().  Meanwhile, it must be set to
make sure loop within ngx_output_chain() will be properly terminated.

There are no known cases that trigger the problem, though in theory
something like aio + sub filter (something that needs body in memory,
and can also free some memory buffers) + sendfile can result in
"task already active" and "second aio post" alerts.

The fix is to set ctx->aio in ngx_http_copy_aio_sendfile_preload()
and ngx_http_copy_thread_handler().

For consistency, ctx->aio is no longer set explicitly in
ngx_output_chain_copy_buf(), as it's now done in
ngx_http_copy_thread_handler().
This commit is contained in:
Maxim Dounin 2016-03-03 21:14:19 +03:00
parent a6fe512df6
commit 00fcc6a987
2 changed files with 12 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
src/core/ngx_output_chain.c
View File

@ -581,7 +581,6 @@ ngx_output_chain_copy_buf(ngx_output_chain_ctx_t *ctx)
n = ngx_thread_read(&ctx->thread_task, src->file, dst->pos,
(size_t) size, src->file_pos, ctx->pool);
if (n == NGX_AGAIN) {
ctx->aio = 1;
return NGX_AGAIN;
}

16
src/http/ngx_http_copy_filter_module.c
View File

@ -204,10 +204,11 @@ ngx_http_copy_aio_event_handler(ngx_event_t *ev)
static ssize_t
ngx_http_copy_aio_sendfile_preload(ngx_buf_t *file)
{
ssize_t n;
static u_char buf[1];
ngx_event_aio_t *aio;
ngx_http_request_t *r;
ssize_t n;
static u_char buf[1];
ngx_event_aio_t *aio;
ngx_http_request_t *r;
ngx_output_chain_ctx_t *ctx;
n = ngx_file_aio_read(file->file, buf, 1, file->file_pos, NULL);
@ -218,6 +219,9 @@ ngx_http_copy_aio_sendfile_preload(ngx_buf_t *file)
r = aio->data;
r->main->blocked++;
r->aio = 1;
ctx = ngx_http_get_module_ctx(r, ngx_http_copy_filter_module);
ctx->aio = 1;
}
return n;
@ -252,6 +256,7 @@ ngx_http_copy_thread_handler(ngx_thread_task_t *task, ngx_file_t *file)
ngx_str_t name;
ngx_thread_pool_t *tp;
ngx_http_request_t *r;
ngx_output_chain_ctx_t *ctx;
ngx_http_core_loc_conf_t *clcf;
r = file->thread_ctx;
@ -285,6 +290,9 @@ ngx_http_copy_thread_handler(ngx_thread_task_t *task, ngx_file_t *file)
r->main->blocked++;
r->aio = 1;
ctx = ngx_http_get_module_ctx(r, ngx_http_copy_filter_module);
ctx->aio = 1;
return NGX_OK;
}