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Makefile / racy-git.txt: clarify USE_NSEC prerequisites
Signed-off-by: Karsten Blees <blees@dcon.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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@ -41,13 +41,17 @@ With a `USE_STDEV` compile-time option, `st_dev` is also
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compared, but this is not enabled by default because this member
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is not stable on network filesystems. With `USE_NSEC`
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compile-time option, `st_mtim.tv_nsec` and `st_ctim.tv_nsec`
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members are also compared, but this is not enabled by default
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members are also compared. On Linux, this is not enabled by default
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because in-core timestamps can have finer granularity than
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on-disk timestamps, resulting in meaningless changes when an
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inode is evicted from the inode cache. See commit 8ce13b0
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of git://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git
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([PATCH] Sync in core time granularity with filesystems,
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2005-01-04).
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2005-01-04). This patch is included in kernel 2.6.11 and newer, but
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only fixes the issue for file systems with exactly 1 ns or 1 s
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resolution. Other file systems are still broken in current Linux
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kernels (e.g. CEPH, CIFS, NTFS, UDF), see
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https://lkml.org/lkml/2015/6/9/714
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Racy Git
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--------
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9
Makefile
9
Makefile
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@ -217,10 +217,11 @@ all::
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# as the compiler can crash (http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49299)
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#
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# Define USE_NSEC below if you want git to care about sub-second file mtimes
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# and ctimes. Note that you need recent glibc (at least 2.2.4) for this, and
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# it will BREAK YOUR LOCAL DIFFS! show-diff and anything using it will likely
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# randomly break unless your underlying filesystem supports those sub-second
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# times (my ext3 doesn't).
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# and ctimes. Note that you need recent glibc (at least 2.2.4) for this. On
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# Linux, kernel 2.6.11 or newer is required for reliable sub-second file times
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# on file systems with exactly 1 ns or 1 s resolution. If you intend to use Git
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# on other file systems (e.g. CEPH, CIFS, NTFS, UDF), don't enable USE_NSEC. See
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# Documentation/technical/racy-git.txt for details.
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#
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# Define USE_ST_TIMESPEC if your "struct stat" uses "st_ctimespec" instead of
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# "st_ctim"
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