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Add proper errcodes to new error messages for read() failures

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Those would use the default ERRCODE_INTERNAL_ERROR, but for foreseeable
failures an errcode ought to be set, ERRCODE_DATA_CORRUPTED making the
most sense here.

While on the way, fix one errcode_for_file_access missing in origin.c
since the code has been created, and remove one assignment of errno to 0
before calling read(), as this was around to fit with what was present
before 811b6e36 where errno would not be set when not enough bytes are
read.  I have noticed the first one, and Tom has pinged me about the
second one.

Author: Michael Paquier
Reported-by: Tom Lane
Discussion: https://postgr.es/m/27265.1531925836@sss.pgh.pa.us
This commit is contained in:
Michael Paquier
2018-07-23 09:37:36 +09:00
parent 56df07bb9e
commit e41d0a1090
7 changed files with 30 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
src/backend/access/transam/xlog.c
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@ -3412,7 +3412,6 @@ XLogFileCopy(XLogSegNo destsegno, TimeLineID srcTLI, XLogSegNo srcsegno,
if (nread > sizeof(buffer))
nread = sizeof(buffer);
errno = 0;
pgstat_report_wait_start(WAIT_EVENT_WAL_COPY_READ);
r = read(srcfd, buffer, nread);
if (r != nread)
@ -3424,7 +3423,8 @@ XLogFileCopy(XLogSegNo destsegno, TimeLineID srcTLI, XLogSegNo srcsegno,
path)));
else
ereport(ERROR,
(errmsg("could not read file \"%s\": read %d of %zu",
(errcode(ERRCODE_DATA_CORRUPTED),
errmsg("could not read file \"%s\": read %d of %zu",
path, r, (Size) nread)));
}
pgstat_report_wait_end();
@ -4564,7 +4564,8 @@ ReadControlFile(void)
XLOG_CONTROL_FILE)));
else
ereport(PANIC,
(errmsg("could not read file \"%s\": read %d of %zu",
(errcode(ERRCODE_DATA_CORRUPTED),
errmsg("could not read file \"%s\": read %d of %zu",
XLOG_CONTROL_FILE, r, sizeof(ControlFileData))));
}
pgstat_report_wait_end();
@ -11829,7 +11830,8 @@ retry:
}
else
ereport(emode_for_corrupt_record(emode, targetPagePtr + reqLen),
(errmsg("could not read from log segment %s, offset %u: read %d of %zu",
(errcode(ERRCODE_DATA_CORRUPTED),
errmsg("could not read from log segment %s, offset %u: read %d of %zu",
fname, readOff, r, (Size) XLOG_BLCKSZ)));
goto next_record_is_invalid;
}