diff options
| author | Jason Hatton <jhatton@globalfinishing.com> | 2023-10-12 19:09:30 +0300 |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2023-10-13 23:33:35 +0300 |
| commit | 5143ac07b17e2b025865378fce24cc11ac7bf8b1 (patch) | |
| tree | 5a09d65e4fa14273e763d0ec8994a0fe01a1eb09 /t/t7508-status.sh | |
| parent | 678eb55f5da174fce21f686f0073d56904c081c9 (diff) | |
Prevent git from rehashing 4GiB files
The index stores file sizes using a uint32_t. This causes any file
that is a multiple of 2^32 to have a cached file size of zero.
Zero is a special value used by racily clean. This causes git to
rehash every file that is a multiple of 2^32 every time git status
or git commit is run.
This patch mitigates the problem by making all files that are a
multiple of 2^32 appear to have a size of 1<<31 instead of zero.
The value of 1<<31 is chosen to keep it as far away from zero
as possible to help prevent things getting mixed up with unpatched
versions of git.
An example would be to have a 2^32 sized file in the index of
patched git. Patched git would save the file as 2^31 in the cache.
An unpatched git would very much see the file has changed in size
and force it to rehash the file, which is safe. The file would
have to grow or shrink by exactly 2^31 and retain all of its
ctime, mtime, and other attributes for old git to not notice
the change.
This patch does not change the behavior of any file that is not
an exact multiple of 2^32.
Signed-off-by: Jason D. Hatton <jhatton@globalfinishing.com>
Signed-off-by: brian m. carlson <bk2204@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 't/t7508-status.sh')
| -rwxr-xr-x | t/t7508-status.sh | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/t/t7508-status.sh b/t/t7508-status.sh index 6928fd89f5..6c46648e11 100755 --- a/t/t7508-status.sh +++ b/t/t7508-status.sh @@ -1745,4 +1745,20 @@ test_expect_success 'slow status advice when core.untrackedCache true, and fsmon ) ' +test_expect_success EXPENSIVE 'status does not re-read unchanged 4 or 8 GiB file' ' + ( + mkdir large-file && + cd large-file && + # Files are 2 GiB, 4 GiB, and 8 GiB sparse files. + test-tool truncate file-a 0x080000000 && + test-tool truncate file-b 0x100000000 && + test-tool truncate file-c 0x200000000 && + # This will be slow. + git add file-a file-b file-c && + git commit -m "add large files" && + git diff-index HEAD file-a file-b file-c >actual && + test_must_be_empty actual + ) +' + test_done |