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libutil/archive: add preallocate-contents option

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Make archive preallocation (fallocate) optional because some filesystems
like btrfs do not behave as expected with fallocate.

See #3550.
This commit is contained in:
Dominique Martinet 2020-09-23 17:39:19 +02:00
parent 9c95a8bebf
commit 2548347bba
1 changed files with 5 additions and 0 deletions
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5
src/libutil/archive.cc
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@ -27,6 +27,8 @@ struct ArchiveSettings : Config
#endif #endif
"use-case-hack", "use-case-hack",
"Whether to enable a Darwin-specific hack for dealing with file name collisions."}; "Whether to enable a Darwin-specific hack for dealing with file name collisions."};
Setting<bool> preallocateContents{this, true, "preallocate-contents",
"Whether to preallocate files when writing objects with known size."};
}; };
static ArchiveSettings archiveSettings; static ArchiveSettings archiveSettings;
@ -325,6 +327,9 @@ struct RestoreSink : ParseSink
void preallocateContents(uint64_t len) void preallocateContents(uint64_t len)
{ {
if (!archiveSettings.preallocateContents)
return;
#if HAVE_POSIX_FALLOCATE #if HAVE_POSIX_FALLOCATE
if (len) { if (len) {
errno = posix_fallocate(fd.get(), 0, len); errno = posix_fallocate(fd.get(), 0, len);