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index-format.txt: document v2 format of file system monitor extension

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Update the documentation of the file system monitor extension to
describe version 2.

The format was extended to support opaque tokens in:
56c6910028 fsmonitor: change last update timestamp on the index_state to opaque token

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff Hostetler 2020-12-14 13:33:42 +00:00 committed by Junio C Hamano
parent c9a33e5e5d
commit 5885367e8f
1 changed files with 8 additions and 2 deletions
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Documentation/technical/index-format.txt
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@ -304,12 +304,18 @@ The remaining data of each directory block is grouped by type:
The extension starts with
- 32-bit version number: the current supported version is 1.
- 32-bit version number: the current supported versions are 1 and 2.
- 64-bit time: the extension data reflects all changes through the given
- (Version 1)
64-bit time: the extension data reflects all changes through the given
time which is stored as the nanoseconds elapsed since midnight,
January 1, 1970.
- (Version 2)
A null terminated string: an opaque token defined by the file system
monitor application. The extension data reflects all changes relative
to that token.
- 32-bit bitmap size: the size of the CE_FSMONITOR_VALID bitmap.
- An ewah bitmap, the n-th bit indicates whether the n-th index entry