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2009-07-22janitor: add DIV_ROUND_UP and use it.Libravatar Pierre Habouzit1-1/+1
Signed-off-by: Pierre Habouzit <madcoder@debian.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-07-09Make index preloading check the whole path to the fileLibravatar Linus Torvalds1-0/+4
This uses the new thread-safe 'threaded_has_symlink_leading_path()' function to efficiently verify that the whole path leading up to the filename is a proper path, and does not contain symlinks. This makes 'ce_uptodate()' a much stronger guarantee: it no longer just guarantees that the 'lstat()' of the path would match, it also means that we know that people haven't played games with moving directories around and covered it up with symlinks. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-12-02Makefile: introduce NO_PTHREADSLibravatar Junio C Hamano1-0/+9
This introduces make variable NO_PTHREADS for platforms that lack the support for pthreads library or people who do not want to use it for whatever reason. When defined, it makes the multi-threaded index preloading into a no-op, and also disables threaded delta searching by pack-objects. Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Mike Ralphson <mike@abacus.co.uk> Tested-by: Johannes Sixt <j6t@kdbg.org> (AIX 4.3.x) Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-11-17Fix index preloading for racy dirty caseLibravatar Linus Torvalds1-1/+1
In the threaded index preloading case, we must be sure to always use the CE_MATCH_RACY_IS_DIRTY flag when calling ie_match_stat(), in order to make sure that we only ever look at the stat() data, and don't try to do anything fancy. Because most of git internals are not thread-safe, and must not be called in parallel. Otherwise, what happens is that if the timestamps indicate that an entry _might_ be dirty, we might start actually comparing filesystem data with the object database. And we mustn't do that, because that would involve looking up and creating the object structure, and that whole code sequence with read_sha1_file() where we look up and add objects to the hashes is definitely not thread-safe. Nor do we want to add locking, because the whole point of the preload was to be simple and not affect anything else. With CE_MATCH_RACY_IS_DIRTY, we get what we wanted, and we'll just leave the hard cases well alone, to be done later in the much simpler serial case. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-11-14Add cache preload facilityLibravatar Linus Torvalds1-0/+91
This can do the lstat() storm in parallel, giving potentially much improved performance for cold-cache cases or things like NFS that have weak metadata caching. Just use "read_cache_preload()" instead of "read_cache()" to force an optimistic preload of the index stat data. The function takes a pathspec as its argument, allowing us to preload only the relevant portion of the index. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>