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annotate src/os/unix/ngx_channel.h @ 7668:0a04e5e4c40b

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Large block sizes on Linux are now ignored (ticket #1168). NFS on Linux is known to report wsize as a block size (in both f_bsize and f_frsize, both in statfs() and statvfs()). On the other hand, typical file system block sizes on Linux (ext2/ext3/ext4, XFS) are limited to pagesize. (With FAT, block sizes can be at least up to 512k in extreme cases, but this doesn't really matter, see below.) To avoid too aggressive cache clearing on NFS volumes on Linux, block sizes larger than pagesize are now ignored. Note that it is safe to ignore large block sizes. Since 3899:e7cd13b7f759 (1.0.1) cache size is calculated based on fstat() st_blocks, and rounding to file system block size is preserved mostly for Windows. Note well that on other OSes valid block sizes seen are at least up to 65536. In particular, UFS on FreeBSD is known to work well with block and fragment sizes set to 65536.
author Maxim Dounin <mdounin@mdounin.ru>
date Mon, 22 Jun 2020 18:02:58 +0300
parents 2cd019520210
children
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da8c5707af39 nginx-0.1.0-2004-09-28-12:34:51 import; set copyright and remove unused files
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da8c5707af39 nginx-0.1.0-2004-09-28-12:34:51 import; set copyright and remove unused files
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2 /*
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42d11f017717 nginx-0.1.0-2004-09-29-20:00:49 import; remove years from copyright
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3 * Copyright (C) Igor Sysoev
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d620f497c50f Copyright updated.
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4 * Copyright (C) Nginx, Inc.
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da8c5707af39 nginx-0.1.0-2004-09-28-12:34:51 import; set copyright and remove unused files
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5 */
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8 #ifndef _NGX_CHANNEL_H_INCLUDED_
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9 #define _NGX_CHANNEL_H_INCLUDED_
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12 #include <ngx_config.h>
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13 #include <ngx_core.h>
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14 #include <ngx_event.h>
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17 typedef struct {
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18 ngx_uint_t command;
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19 ngx_pid_t pid;
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20 ngx_int_t slot;
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21 ngx_fd_t fd;
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22 } ngx_channel_t;
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25 ngx_int_t ngx_write_channel(ngx_socket_t s, ngx_channel_t *ch, size_t size,
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26 ngx_log_t *log);
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27 ngx_int_t ngx_read_channel(ngx_socket_t s, ngx_channel_t *ch, size_t size,
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28 ngx_log_t *log);
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29 ngx_int_t ngx_add_channel_event(ngx_cycle_t *cycle, ngx_fd_t fd,
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30 ngx_int_t event, ngx_event_handler_pt handler);
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b670db10cbbd nginx-0.0.7-2004-07-14-20:01:42 import
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31 void ngx_close_channel(ngx_fd_t *fd, ngx_log_t *log);
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34 #endif /* _NGX_CHANNEL_H_INCLUDED_ */