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Fix unnecessary padding in incremental backups

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Commit 10e3226ba13d added padding to incremental backups to ensure the
block data is properly aligned. The code in sendFile() however failed to
consider that the header may be a multiple of BLCKSZ and thus already
aligned, adding a full BLCKSZ of unnecessary padding.

Not only does this make the incremental file a bit larger, but the other
places calculating the amount of padding did realize it's not needed and
did not include it in the formula. This resulted in pg_basebackup
getting confused while parsing the data stream, trying to access files
with invalid filenames (e.g. with binary data etc.) and failing.
This commit is contained in:
Tomas Vondra 2024-04-14 20:34:29 +02:00
parent 8225c2fd40
commit cd4b6af620
1 changed files with 5 additions and 4 deletions
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9
src/backend/backup/basebackup.c
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@ -1638,11 +1638,12 @@ sendFile(bbsink *sink, const char *readfilename, const char *tarfilename,
/* /*
* Add padding to align header to a multiple of BLCKSZ, but only if * Add padding to align header to a multiple of BLCKSZ, but only if
* the incremental file has some blocks. If there are no blocks we * the incremental file has some blocks, and the alignment is actually
* don't want make the file unnecessarily large, as that might make * needed (i.e. header is not already a multiple of BLCKSZ). If there
* some filesystem optimizations impossible. * are no blocks we don't want to make the file unnecessarily large,
* as that might make some filesystem optimizations impossible.
*/ */
if (num_incremental_blocks > 0) if ((num_incremental_blocks > 0) && (header_bytes_done % BLCKSZ != 0))
{ {
paddinglen = (BLCKSZ - (header_bytes_done % BLCKSZ)); paddinglen = (BLCKSZ - (header_bytes_done % BLCKSZ));