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fsmonitor: return invalidated cache-entry count on directory event

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Teach the refresh callback helper function for directory FSEvents to
return the number of cache-entries that were invalidated in response
to a directory event.

This will be used in a later commit to help determine if the observed
pathname in the FSEvent was a (possibly) case-incorrect directory
prefix (on a case-insensitive filesystem) of one or more actual
cache-entries.

If there exists at least one case-insensitive prefix match, then we
can assume that the directory is a (case-incorrect) prefix of at least
one tracked item rather than a completely unknown/untracked file or
directory.

Signed-off-by: Jeff Hostetler <jeffhostetler@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff Hostetler 2024-02-26 21:39:20 +00:00 committed by Junio C Hamano
parent 7c97174dcd
commit a52482036c
1 changed files with 13 additions and 1 deletions
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14
fsmonitor.c
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@ -253,11 +253,20 @@ static void handle_path_without_trailing_slash(
* same way and just invalidate the cache-entry and the untracked
* cache (and in this case, the forward cache-entry scan won't find
* anything and it doesn't hurt to let it run).
*
* Return the number of cache-entries that we invalidated. We will
* use this later to determine if we need to attempt a second
* case-insensitive search on case-insensitive file systems. That is,
* if the search using the observed-case in the FSEvent yields any
* results, we assume the prefix is case-correct. If there are no
* matches, we still don't know if the observed path is simply
* untracked or case-incorrect.
*/
static void handle_path_with_trailing_slash(
static size_t handle_path_with_trailing_slash(
struct index_state *istate, const char *name, int pos)
{
int i;
size_t nr_in_cone = 0;
/*
* Mark the untracked cache dirty for this directory path
@ -276,7 +285,10 @@ static void handle_path_with_trailing_slash(
if (!starts_with(istate->cache[i]->name, name))
break;
istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID;
nr_in_cone++;
}
return nr_in_cone;
}
static void fsmonitor_refresh_callback(struct index_state *istate, char *name)