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fsmonitor: enhance existing comments

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Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
This commit is contained in:
Jeff Hostetler
2021-05-19 13:45:55 -04:00
committed by Johannes Schindelin
parent 1042702377
commit dc250122a4
1 changed files with 30 additions and 7 deletions
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37
fsmonitor.c
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@@ -301,9 +301,25 @@ void refresh_fsmonitor(struct index_state *istate)
core_fsmonitor, query_success ? "success" : "failure");
}
/* a fsmonitor process can return '/' to indicate all entries are invalid */
/*
* The response from FSMonitor (excluding the header token) is
* either:
*
* [a] a (possibly empty) list of NUL delimited relative
* pathnames of changed paths. This list can contain
* files and directories. Directories have a trailing
* slash.
*
* [b] a single '/' to indicate the provider had no
* information and that we should consider everything
* invalid. We call this a trivial response.
*/
if (query_success && query_result.buf[bol] != '/') {
/* Mark all entries returned by the monitor as dirty */
/*
* Mark all pathnames returned by the monitor as dirty.
*
* This updates both the cache-entries and the untracked-cache.
*/
buf = query_result.buf;
for (i = bol; i < query_result.len; i++) {
if (buf[i] != '\0')
@@ -318,11 +334,15 @@ void refresh_fsmonitor(struct index_state *istate)
if (istate->untracked)
istate->untracked->use_fsmonitor = 1;
} else {
/* We only want to run the post index changed hook if we've actually changed entries, so keep track
* if we actually changed entries or not */
/*
* We received a trivial response, so invalidate everything.
*
* We only want to run the post index changed hook if
* we've actually changed entries, so keep track if we
* actually changed entries or not.
*/
int is_cache_changed = 0;
/* Mark all entries invalid */
for (i = 0; i < istate->cache_nr; i++) {
if (istate->cache[i]->ce_flags & CE_FSMONITOR_VALID) {
is_cache_changed = 1;
@@ -330,7 +350,10 @@ void refresh_fsmonitor(struct index_state *istate)
}
}
/* If we're going to check every file, ensure we save the results */
/*
* If we're going to check every file, ensure we save
* the results.
*/
if (is_cache_changed)
istate->cache_changed |= FSMONITOR_CHANGED;