Mercurial > hg > nginx

view src/event/ngx_event_pipe.h @ 7669:52b34c3f89b4

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Too large st_blocks values are now ignored (ticket #157). With XFS, using "allocsize=64m" mount option results in large preallocation being reported in the st_blocks as returned by fstat() till the file is closed. This in turn results in incorrect cache size calculations and wrong clearing based on max_size. To avoid too aggressive cache clearing on such volumes, st_blocks values which result in sizes larger than st_size and eight blocks (an arbitrary limit) are no longer trusted, and we use st_size instead. The ngx_de_fs_size() counterpart is intentionally not modified, as it is used on closed files and hence not affected by this problem.
author Maxim Dounin <mdounin@mdounin.ru>
date Mon, 22 Jun 2020 18:02:59 +0300
parents adc2414856b1
children
line wrap: on
line source


/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_EVENT_PIPE_H_INCLUDED_
#define _NGX_EVENT_PIPE_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>


typedef struct ngx_event_pipe_s  ngx_event_pipe_t;

typedef ngx_int_t (*ngx_event_pipe_input_filter_pt)(ngx_event_pipe_t *p,
                                                    ngx_buf_t *buf);
typedef ngx_int_t (*ngx_event_pipe_output_filter_pt)(void *data,
                                                     ngx_chain_t *chain);


struct ngx_event_pipe_s {
    ngx_connection_t  *upstream;
    ngx_connection_t  *downstream;

    ngx_chain_t       *free_raw_bufs;
    ngx_chain_t       *in;
    ngx_chain_t      **last_in;

    ngx_chain_t       *writing;

    ngx_chain_t       *out;
    ngx_chain_t       *free;
    ngx_chain_t       *busy;

    /*
     * the input filter i.e. that moves HTTP/1.1 chunks
     * from the raw bufs to an incoming chain
     */

    ngx_event_pipe_input_filter_pt    input_filter;
    void                             *input_ctx;

    ngx_event_pipe_output_filter_pt   output_filter;
    void                             *output_ctx;

#if (NGX_THREADS || NGX_COMPAT)
    ngx_int_t                       (*thread_handler)(ngx_thread_task_t *task,
                                                      ngx_file_t *file);
    void                             *thread_ctx;
    ngx_thread_task_t                *thread_task;
#endif

    unsigned           read:1;
    unsigned           cacheable:1;
    unsigned           single_buf:1;
    unsigned           free_bufs:1;
    unsigned           upstream_done:1;
    unsigned           upstream_error:1;
    unsigned           upstream_eof:1;
    unsigned           upstream_blocked:1;
    unsigned           downstream_done:1;
    unsigned           downstream_error:1;
    unsigned           cyclic_temp_file:1;
    unsigned           aio:1;

    ngx_int_t          allocated;
    ngx_bufs_t         bufs;
    ngx_buf_tag_t      tag;

    ssize_t            busy_size;

    off_t              read_length;
    off_t              length;

    off_t              max_temp_file_size;
    ssize_t            temp_file_write_size;

    ngx_msec_t         read_timeout;
    ngx_msec_t         send_timeout;
    ssize_t            send_lowat;

    ngx_pool_t        *pool;
    ngx_log_t         *log;

    ngx_chain_t       *preread_bufs;
    size_t             preread_size;
    ngx_buf_t         *buf_to_file;

    size_t             limit_rate;
    time_t             start_sec;

    ngx_temp_file_t   *temp_file;

    /* STUB */ int     num;
};


ngx_int_t ngx_event_pipe(ngx_event_pipe_t *p, ngx_int_t do_write);
ngx_int_t ngx_event_pipe_copy_input_filter(ngx_event_pipe_t *p, ngx_buf_t *buf);
ngx_int_t ngx_event_pipe_add_free_buf(ngx_event_pipe_t *p, ngx_buf_t *b);


#endif /* _NGX_EVENT_PIPE_H_INCLUDED_ */