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248c3a937d
The error handling here was a mess, as a result of a fundamentally bad design (relying on errno to keep its value much longer than is safe to assume) as well as a lot of just plain sloppiness, both as to noticing errors at all and as to reporting the correct errno. Moreover, the recent addition of LZ4 compression broke things completely, because liblz4 doesn't use errno to report errors. To improve matters, keep the error state in the DirectoryMethodData or TarMethodData struct, and add a string field so we can handle cases that don't set errno. (The tar methods already had a version of this, but it can be done more efficiently since all these cases use a constant error string.) Make the dir and tar methods handle errors in basically identical ways, which they didn't before. This requires copying errno into the state struct in a lot of places, which is a bit tedious, but it has the virtue that we can get rid of ad-hoc code to save and restore errno in a number of places ... not to mention that it fixes other places that should've saved/restored errno but neglected to. In passing, fix some pointlessly static buffers to be ordinary local variables. There remains an issue about exactly how to handle errors from fsync(), but that seems like material for its own patch. While the LZ4 problems are new, all the rest of this is fixes for old bugs, so backpatch to v10 where walmethods.c was introduced. Patch by me; thanks to Michael Paquier for review. Discussion: https://postgr.es/m/1343113.1636489231@sss.pgh.pa.us |
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