[nginx] Core: added disk_full_time checks to error log.

[Maxim Dounin]

details:   http://hg.nginx.org/nginx/rev/727177743c3c
branches:  
changeset: 5962:727177743c3c
user:      Maxim Dounin <mdounin at mdounin.ru>
date:      Tue Jan 13 19:51:37 2015 +0300
description:
Core: added disk_full_time checks to error log.

diffstat:

 src/core/ngx_log.c |  25 +++++++++++++++++++++----
 src/core/ngx_log.h |   2 ++
 2 files changed, 23 insertions(+), 4 deletions(-)

diffs (62 lines):

diff --git a/src/core/ngx_log.c b/src/core/ngx_log.c
--- a/src/core/ngx_log.c
+++ b/src/core/ngx_log.c
@@ -91,8 +91,9 @@ ngx_log_error_core(ngx_uint_t level, ngx
     va_list      args;
 #endif
     u_char      *p, *last, *msg;
+    ssize_t      n;
+    ngx_uint_t   wrote_stderr, debug_connection;
     u_char       errstr[NGX_MAX_ERROR_STR];
-    ngx_uint_t   wrote_stderr, debug_connection;
 
     last = errstr + NGX_MAX_ERROR_STR;
 
@@ -150,16 +151,32 @@ ngx_log_error_core(ngx_uint_t level, ngx
 
         if (log->writer) {
             log->writer(log, level, errstr, p - errstr);
-            log = log->next;
-            continue;
+            goto next;
         }
 
-        (void) ngx_write_fd(log->file->fd, errstr, p - errstr);
+        if (ngx_time() == log->disk_full_time) {
+
+            /*
+             * on FreeBSD writing to a full filesystem with enabled softupdates
+             * may block process for much longer time than writing to non-full
+             * filesystem, so we skip writing to a log for one second
+             */
+
+            goto next;
+        }
+
+        n = ngx_write_fd(log->file->fd, errstr, p - errstr);
+
+        if (n == -1 && ngx_errno == NGX_ENOSPC) {
+            log->disk_full_time = ngx_time();
+        }
 
         if (log->file->fd == ngx_stderr) {
             wrote_stderr = 1;
         }
 
+    next:
+
         log = log->next;
     }
 
diff --git a/src/core/ngx_log.h b/src/core/ngx_log.h
--- a/src/core/ngx_log.h
+++ b/src/core/ngx_log.h
@@ -53,6 +53,8 @@ struct ngx_log_s {
 
     ngx_atomic_uint_t    connection;
 
+    time_t               disk_full_time;
+
     ngx_log_handler_pt   handler;
     void                *data;