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Re: (ITS#8106) Retry pwrite operations in case of EINTR

To: openldap-its@OpenLDAP.org
Subject: Re: (ITS#8106) Retry pwrite operations in case of EINTR
From: milinevskyy@gmail.com
Date: Fri, 17 Apr 2015 08:49:16 +0000
Auto-submitted: auto-generated (OpenLDAP-ITS)
--f46d04426b642829070513e7a46a
Content-Type: text/plain; charset=UTF-8

Proposed patch in message body as issue tracker doesn't recognizes
attachments:

commit c9857a7c0df4448a14a2aa9f55850df5e830069e
Author: Dmytro Milinevskyy <milinevskyy@gmail.com>
Date:   Fri Apr 17 10:41:26 2015 +0200

    libmdb: retry write operation in case of interrupted system

diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index a95c7cd..ed7f370 100644
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -3236,6 +3236,7 @@ mdb_page_flush(MDB_txn *txn, int keep)
                /* Write up to MDB_COMMIT_PAGES dirty pages at a time. */
                if (pos!=next_pos || n==MDB_COMMIT_PAGES ||
wsize+size>MAX_WRITE) {
                        if (n) {
+              retry_write:
                                /* Write previous page(s) */
 #ifdef MDB_USE_PWRITEV
                                wres = pwritev(env->me_fd, iov, n, wpos);
@@ -3243,8 +3244,10 @@ mdb_page_flush(MDB_txn *txn, int keep)
                                if (n == 1) {
                                        wres = pwrite(env->me_fd,
iov[0].iov_base, wsize, wpos);
                                } else {
+                                 retry_seek:
                                        if (lseek(env->me_fd, wpos,
SEEK_SET) == -1) {
                                                rc = ErrCode();
+                                               if (EINTR == rc) goto
retry_seek;
                                                DPRINTF(("lseek: %s",
strerror(rc)));
                                                return rc;
                                        }
@@ -3254,6 +3257,7 @@ mdb_page_flush(MDB_txn *txn, int keep)
                                if (wres != wsize) {
                                        if (wres < 0) {
                                                rc = ErrCode();
+                                               if (EINTR == rc) goto
retry_write;
                                                DPRINTF(("Write error: %s",
strerror(rc)));
                                        } else {
                                                rc = EIO; /* TODO: Use
which error code? */
@@ -3627,7 +3631,8 @@ mdb_env_init_meta(MDB_env *env, MDB_meta *meta)
        int len;
 #define DO_PWRITE(rc, fd, ptr, size, len, pos) do { \
        len = pwrite(fd, ptr, size, pos);       \
-       rc = (len >= 0); } while(0)
+       if (len == -1 && EINVAL == ErrCode()) continue; \
+       rc = (len >= 0); break; } while(1)
 #endif

        DPUTS("writing new meta page");
@@ -3735,6 +3740,7 @@ mdb_env_write_meta(MDB_txn *txn)

        /* Write to the SYNC fd */
        mfd = (flags & (MDB_NOSYNC|MDB_NOMETASYNC)) ? env->me_fd :
env->me_mfd;
+retry_write:
 #ifdef _WIN32
        {
                memset(&ov, 0, sizeof(ov));
@@ -3747,6 +3753,7 @@ mdb_env_write_meta(MDB_txn *txn)
 #endif
        if (rc != len) {
                rc = rc < 0 ? ErrCode() : EIO;
+               if (EINTR == rc) goto retry_write;
                DPUTS("write failed, disk error?");
                /* On a failure, the pagecache still contains the new data.
                 * Write some old data back, to prevent it from being used.

On Fri, Apr 17, 2015 at 10:46 AM, Dmytro Milinevskyy <milinevskyy@gmail.com>
wrote:

> Proposed patch in attachment.
>
> On Fri, Apr 17, 2015 at 10:43 AM, <openldap-its@openldap.org> wrote:
>
>>
>> *** THIS IS AN AUTOMATICALLY GENERATED REPLY ***
>>
>> Thanks for your report to the OpenLDAP Issue Tracking System.  Your
>> report has been assigned the tracking number ITS#8106.
>>
>> One of our support engineers will look at your report in due course.
>> Note that this may take some time because our support engineers
>> are volunteers.  They only work on OpenLDAP when they have spare
>> time.
>>
>> If you need to provide additional information in regards to your
>> issue report, you may do so by replying to this message.  Note that
>> any mail sent to openldap-its@openldap.org with (ITS#8106)
>> in the subject will automatically be attached to the issue report.
>>
>>         mailto:openldap-its@openldap.org?subject=(ITS#8106)
>>
>> You may follow the progress of this report by loading the following
>> URL in a web browser:
>>     http://www.OpenLDAP.org/its/index.cgi?findid=8106
>>
>> Please remember to retain your issue tracking number (ITS#8106)
>> on any further messages you send to us regarding this report.  If
>> you don't then you'll just waste our time and yours because we
>> won't be able to properly track the report.
>>
>> Please note that the Issue Tracking System is not intended to
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>> Such requests will be closed.
>>
>> OpenLDAP Software is user supported.
>>         http://www.OpenLDAP.org/support/
>>
>> --------------
>> Copyright 1998-2007 The OpenLDAP Foundation, All Rights Reserved.
>>
>>
>

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