[thirdparty/git.git] / fsmonitor.c

#include "cache.h"
#include "config.h"
#include "dir.h"
#include "ewah/ewok.h"
#include "fsmonitor.h"
#include "run-command.h"
#include "strbuf.h"

#define INDEX_EXTENSION_VERSION1	(1)
#define INDEX_EXTENSION_VERSION2	(2)
#define HOOK_INTERFACE_VERSION1		(1)
#define HOOK_INTERFACE_VERSION2		(2)

struct trace_key trace_fsmonitor = TRACE_KEY_INIT(FSMONITOR);

static void fsmonitor_ewah_callback(size_t pos, void *is)
{
	struct index_state *istate = (struct index_state *)is;
	struct cache_entry *ce;

	if (pos >= istate->cache_nr)
		BUG("fsmonitor_dirty has more entries than the index (%"PRIuMAX" >= %u)",
		    (uintmax_t)pos, istate->cache_nr);

	ce = istate->cache[pos];
	ce->ce_flags &= ~CE_FSMONITOR_VALID;
}

static int fsmonitor_hook_version(void)
{
	int hook_version;

	if (git_config_get_int("core.fsmonitorhookversion", &hook_version))
		return -1;

	if (hook_version == HOOK_INTERFACE_VERSION1 ||
	    hook_version == HOOK_INTERFACE_VERSION2)
		return hook_version;

	warning("Invalid hook version '%i' in core.fsmonitorhookversion. "
		"Must be 1 or 2.", hook_version);
	return -1;
}

int read_fsmonitor_extension(struct index_state *istate, const void *data,
	unsigned long sz)
{
	const char *index = data;
	uint32_t hdr_version;
	uint32_t ewah_size;
	struct ewah_bitmap *fsmonitor_dirty;
	int ret;
	uint64_t timestamp;
	struct strbuf last_update = STRBUF_INIT;

	if (sz < sizeof(uint32_t) + 1 + sizeof(uint32_t))
		return error("corrupt fsmonitor extension (too short)");

	hdr_version = get_be32(index);
	index += sizeof(uint32_t);
	if (hdr_version == INDEX_EXTENSION_VERSION1) {
		timestamp = get_be64(index);
		strbuf_addf(&last_update, "%"PRIu64"", timestamp);
		index += sizeof(uint64_t);
	} else if (hdr_version == INDEX_EXTENSION_VERSION2) {
		strbuf_addstr(&last_update, index);
		index += last_update.len + 1;
	} else {
		return error("bad fsmonitor version %d", hdr_version);
	}

	istate->fsmonitor_last_update = strbuf_detach(&last_update, NULL);

	ewah_size = get_be32(index);
	index += sizeof(uint32_t);

	fsmonitor_dirty = ewah_new();
	ret = ewah_read_mmap(fsmonitor_dirty, index, ewah_size);
	if (ret != ewah_size) {
		ewah_free(fsmonitor_dirty);
		return error("failed to parse ewah bitmap reading fsmonitor index extension");
	}
	istate->fsmonitor_dirty = fsmonitor_dirty;

	if (!istate->split_index &&
	    istate->fsmonitor_dirty->bit_size > istate->cache_nr)
		BUG("fsmonitor_dirty has more entries than the index (%"PRIuMAX" > %u)",
		    (uintmax_t)istate->fsmonitor_dirty->bit_size, istate->cache_nr);

	trace_printf_key(&trace_fsmonitor, "read fsmonitor extension successful");
	return 0;
}

void fill_fsmonitor_bitmap(struct index_state *istate)
{
	unsigned int i, skipped = 0;
	istate->fsmonitor_dirty = ewah_new();
	for (i = 0; i < istate->cache_nr; i++) {
		if (istate->cache[i]->ce_flags & CE_REMOVE)
			skipped++;
		else if (!(istate->cache[i]->ce_flags & CE_FSMONITOR_VALID))
			ewah_set(istate->fsmonitor_dirty, i - skipped);
	}
}

void write_fsmonitor_extension(struct strbuf *sb, struct index_state *istate)
{
	uint32_t hdr_version;
	uint32_t ewah_start;
	uint32_t ewah_size = 0;
	int fixup = 0;

	if (!istate->split_index &&
	    istate->fsmonitor_dirty->bit_size > istate->cache_nr)
		BUG("fsmonitor_dirty has more entries than the index (%"PRIuMAX" > %u)",
		    (uintmax_t)istate->fsmonitor_dirty->bit_size, istate->cache_nr);

	put_be32(&hdr_version, INDEX_EXTENSION_VERSION2);
	strbuf_add(sb, &hdr_version, sizeof(uint32_t));

	strbuf_addstr(sb, istate->fsmonitor_last_update);
	strbuf_addch(sb, 0); /* Want to keep a NUL */

	fixup = sb->len;
	strbuf_add(sb, &ewah_size, sizeof(uint32_t)); /* we'll fix this up later */

	ewah_start = sb->len;
	ewah_serialize_strbuf(istate->fsmonitor_dirty, sb);
	ewah_free(istate->fsmonitor_dirty);
	istate->fsmonitor_dirty = NULL;

	/* fix up size field */
	put_be32(&ewah_size, sb->len - ewah_start);
	memcpy(sb->buf + fixup, &ewah_size, sizeof(uint32_t));

	trace_printf_key(&trace_fsmonitor, "write fsmonitor extension successful");
}

/*
 * Call the query-fsmonitor hook passing the last update token of the saved results.
 */
static int query_fsmonitor(int version, const char *last_update, struct strbuf *query_result)
{
	struct child_process cp = CHILD_PROCESS_INIT;

	if (!core_fsmonitor)
		return -1;

	argv_array_push(&cp.args, core_fsmonitor);
	argv_array_pushf(&cp.args, "%d", version);
	argv_array_pushf(&cp.args, "%s", last_update);
	cp.use_shell = 1;
	cp.dir = get_git_work_tree();

	return capture_command(&cp, query_result, 1024);
}

static void fsmonitor_refresh_callback(struct index_state *istate, const char *name)
{
	int pos = index_name_pos(istate, name, strlen(name));

	if (pos >= 0) {
		struct cache_entry *ce = istate->cache[pos];
		ce->ce_flags &= ~CE_FSMONITOR_VALID;
	}

	/*
	 * Mark the untracked cache dirty even if it wasn't found in the index
	 * as it could be a new untracked file.
	 */
	trace_printf_key(&trace_fsmonitor, "fsmonitor_refresh_callback '%s'", name);
	untracked_cache_invalidate_path(istate, name, 0);
}

void refresh_fsmonitor(struct index_state *istate)
{
	struct strbuf query_result = STRBUF_INIT;
	int query_success = 0, hook_version = -1;
	size_t bol = 0; /* beginning of line */
	uint64_t last_update;
	struct strbuf last_update_token = STRBUF_INIT;
	char *buf;
	unsigned int i;

	if (!core_fsmonitor || istate->fsmonitor_has_run_once)
		return;

	hook_version = fsmonitor_hook_version();

	istate->fsmonitor_has_run_once = 1;

	trace_printf_key(&trace_fsmonitor, "refresh fsmonitor");
	/*
	 * This could be racy so save the date/time now and query_fsmonitor
	 * should be inclusive to ensure we don't miss potential changes.
	 */
	last_update = getnanotime();
	if (hook_version == HOOK_INTERFACE_VERSION1)
		strbuf_addf(&last_update_token, "%"PRIu64"", last_update);

	/*
	 * If we have a last update token, call query_fsmonitor for the set of
	 * changes since that token, else assume everything is possibly dirty
	 * and check it all.
	 */
	if (istate->fsmonitor_last_update) {
		if (hook_version == -1 || hook_version == HOOK_INTERFACE_VERSION2) {
			query_success = !query_fsmonitor(HOOK_INTERFACE_VERSION2,
				istate->fsmonitor_last_update, &query_result);

			if (query_success) {
				if (hook_version < 0)
					hook_version = HOOK_INTERFACE_VERSION2;

				/*
				 * First entry will be the last update token
				 * Need to use a char * variable because static
				 * analysis was suggesting to use strbuf_addbuf
				 * but we don't want to copy the entire strbuf
				 * only the the chars up to the first NUL
				 */
				buf = query_result.buf;
				strbuf_addstr(&last_update_token, buf);
				if (!last_update_token.len) {
					warning("Empty last update token.");
					query_success = 0;
				} else {
					bol = last_update_token.len + 1;
				}
			} else if (hook_version < 0) {
				hook_version = HOOK_INTERFACE_VERSION1;
				if (!last_update_token.len)
					strbuf_addf(&last_update_token, "%"PRIu64"", last_update);
			}
		}

		if (hook_version == HOOK_INTERFACE_VERSION1) {
			query_success = !query_fsmonitor(HOOK_INTERFACE_VERSION1,
				istate->fsmonitor_last_update, &query_result);
		}

		trace_performance_since(last_update, "fsmonitor process '%s'", core_fsmonitor);
		trace_printf_key(&trace_fsmonitor, "fsmonitor process '%s' returned %s",
			core_fsmonitor, query_success ? "success" : "failure");
	}

	/* a fsmonitor process can return '/' to indicate all entries are invalid */
	if (query_success && query_result.buf[bol] != '/') {
		/* Mark all entries returned by the monitor as dirty */
		buf = query_result.buf;
		for (i = bol; i < query_result.len; i++) {
			if (buf[i] != '\0')
				continue;
			fsmonitor_refresh_callback(istate, buf + bol);
			bol = i + 1;
		}
		if (bol < query_result.len)
			fsmonitor_refresh_callback(istate, buf + bol);

		/* Now mark the untracked cache for fsmonitor usage */
		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 */
		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;
				istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID;
			}
		}

		/* If we're going to check every file, ensure we save the results */
		if (is_cache_changed)
			istate->cache_changed |= FSMONITOR_CHANGED;

		if (istate->untracked)
			istate->untracked->use_fsmonitor = 0;
	}
	strbuf_release(&query_result);

	/* Now that we've updated istate, save the last_update_token */
	FREE_AND_NULL(istate->fsmonitor_last_update);
	istate->fsmonitor_last_update = strbuf_detach(&last_update_token, NULL);
}

void add_fsmonitor(struct index_state *istate)
{
	unsigned int i;
	struct strbuf last_update = STRBUF_INIT;

	if (!istate->fsmonitor_last_update) {
		trace_printf_key(&trace_fsmonitor, "add fsmonitor");
		istate->cache_changed |= FSMONITOR_CHANGED;
		strbuf_addf(&last_update, "%"PRIu64"", getnanotime());
		istate->fsmonitor_last_update = strbuf_detach(&last_update, NULL);

		/* reset the fsmonitor state */
		for (i = 0; i < istate->cache_nr; i++)
			istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID;

		/* reset the untracked cache */
		if (istate->untracked) {
			add_untracked_cache(istate);
			istate->untracked->use_fsmonitor = 1;
		}

		/* Update the fsmonitor state */
		refresh_fsmonitor(istate);
	}
}

void remove_fsmonitor(struct index_state *istate)
{
	if (istate->fsmonitor_last_update) {
		trace_printf_key(&trace_fsmonitor, "remove fsmonitor");
		istate->cache_changed |= FSMONITOR_CHANGED;
		FREE_AND_NULL(istate->fsmonitor_last_update);
	}
}

void tweak_fsmonitor(struct index_state *istate)
{
	unsigned int i;
	int fsmonitor_enabled = git_config_get_fsmonitor();

	if (istate->fsmonitor_dirty) {
		if (fsmonitor_enabled) {
			/* Mark all entries valid */
			for (i = 0; i < istate->cache_nr; i++) {
				istate->cache[i]->ce_flags |= CE_FSMONITOR_VALID;
			}

			/* Mark all previously saved entries as dirty */
			if (istate->fsmonitor_dirty->bit_size > istate->cache_nr)
				BUG("fsmonitor_dirty has more entries than the index (%"PRIuMAX" > %u)",
				    (uintmax_t)istate->fsmonitor_dirty->bit_size, istate->cache_nr);
			ewah_each_bit(istate->fsmonitor_dirty, fsmonitor_ewah_callback, istate);

			refresh_fsmonitor(istate);
		}

		ewah_free(istate->fsmonitor_dirty);
		istate->fsmonitor_dirty = NULL;
	}

	switch (fsmonitor_enabled) {
	case -1: /* keep: do nothing */
		break;
	case 0: /* false */
		remove_fsmonitor(istate);
		break;
	case 1: /* true */
		add_fsmonitor(istate);
		break;
	default: /* unknown value: do nothing */
		break;
	}
}
Commit	Line	Data
883e248b BP	1	#include "cache.h"
	2	#include "config.h"
	3	#include "dir.h"
	4	#include "ewah/ewok.h"
	5	#include "fsmonitor.h"
	6	#include "run-command.h"
	7	#include "strbuf.h"
	8
56c69100 KW	9	#define INDEX_EXTENSION_VERSION1 (1)
56c69100 KW	10	#define INDEX_EXTENSION_VERSION2 (2)
8da2c576 KW	11	#define HOOK_INTERFACE_VERSION1 (1)
8da2c576 KW	12	#define HOOK_INTERFACE_VERSION2 (2)
883e248b BP	13
	14	struct trace_key trace_fsmonitor = TRACE_KEY_INIT(FSMONITOR);
	15
	16	static void fsmonitor_ewah_callback(size_t pos, void *is)
	17	{
	18	struct index_state istate = (struct index_state )is;
3444ec2e	19	struct cache_entry *ce;
883e248b	20
3444ec2e WB	21	if (pos >= istate->cache_nr)
	22	BUG("fsmonitor_dirty has more entries than the index (%"PRIuMAX" >= %u)",
	23	(uintmax_t)pos, istate->cache_nr);
	24
	25	ce = istate->cache[pos];
883e248b BP	26	ce->ce_flags &= ~CE_FSMONITOR_VALID;
	27	}
	28
8da2c576 KW	29	static int fsmonitor_hook_version(void)
	30	{
	31	int hook_version;
	32
	33	if (git_config_get_int("core.fsmonitorhookversion", &hook_version))
	34	return -1;
	35
	36	if (hook_version == HOOK_INTERFACE_VERSION1 \|\|
	37	hook_version == HOOK_INTERFACE_VERSION2)
	38	return hook_version;
	39
	40	warning("Invalid hook version '%i' in core.fsmonitorhookversion. "
	41	"Must be 1 or 2.", hook_version);
	42	return -1;
	43	}
	44
883e248b BP	45	int read_fsmonitor_extension(struct index_state istate, const void data,
	46	unsigned long sz)
	47	{
	48	const char *index = data;
	49	uint32_t hdr_version;
	50	uint32_t ewah_size;
	51	struct ewah_bitmap *fsmonitor_dirty;
883e248b	52	int ret;
56c69100 KW	53	uint64_t timestamp;
56c69100 KW	54	struct strbuf last_update = STRBUF_INIT;
883e248b	55
56c69100	56	if (sz < sizeof(uint32_t) + 1 + sizeof(uint32_t))
883e248b BP	57	return error("corrupt fsmonitor extension (too short)");
	58
	59	hdr_version = get_be32(index);
	60	index += sizeof(uint32_t);
56c69100 KW	61	if (hdr_version == INDEX_EXTENSION_VERSION1) {
	62	timestamp = get_be64(index);
	63	strbuf_addf(&last_update, "%"PRIu64"", timestamp);
	64	index += sizeof(uint64_t);
	65	} else if (hdr_version == INDEX_EXTENSION_VERSION2) {
	66	strbuf_addstr(&last_update, index);
	67	index += last_update.len + 1;
	68	} else {
883e248b	69	return error("bad fsmonitor version %d", hdr_version);
56c69100	70	}
883e248b	71
56c69100	72	istate->fsmonitor_last_update = strbuf_detach(&last_update, NULL);
883e248b BP	73
	74	ewah_size = get_be32(index);
	75	index += sizeof(uint32_t);
	76
	77	fsmonitor_dirty = ewah_new();
	78	ret = ewah_read_mmap(fsmonitor_dirty, index, ewah_size);
	79	if (ret != ewah_size) {
	80	ewah_free(fsmonitor_dirty);
	81	return error("failed to parse ewah bitmap reading fsmonitor index extension");
	82	}
ba1b9cac	83	istate->fsmonitor_dirty = fsmonitor_dirty;
883e248b	84
61eea521 JH	85	if (!istate->split_index &&
61eea521 JH	86	istate->fsmonitor_dirty->bit_size > istate->cache_nr)
3444ec2e WB	87	BUG("fsmonitor_dirty has more entries than the index (%"PRIuMAX" > %u)",
	88	(uintmax_t)istate->fsmonitor_dirty->bit_size, istate->cache_nr);
	89
883e248b BP	90	trace_printf_key(&trace_fsmonitor, "read fsmonitor extension successful");
	91	return 0;
	92	}
	93
3bd28eb2 AV	94	void fill_fsmonitor_bitmap(struct index_state *istate)
3bd28eb2 AV	95	{
3444ec2e	96	unsigned int i, skipped = 0;
3bd28eb2	97	istate->fsmonitor_dirty = ewah_new();
3444ec2e WB	98	for (i = 0; i < istate->cache_nr; i++) {
	99	if (istate->cache[i]->ce_flags & CE_REMOVE)
	100	skipped++;
	101	else if (!(istate->cache[i]->ce_flags & CE_FSMONITOR_VALID))
	102	ewah_set(istate->fsmonitor_dirty, i - skipped);
	103	}
3bd28eb2 AV	104	}
3bd28eb2 AV	105
883e248b BP	106	void write_fsmonitor_extension(struct strbuf sb, struct index_state istate)
	107	{
	108	uint32_t hdr_version;
883e248b BP	109	uint32_t ewah_start;
	110	uint32_t ewah_size = 0;
	111	int fixup = 0;
	112
61eea521 JH	113	if (!istate->split_index &&
61eea521 JH	114	istate->fsmonitor_dirty->bit_size > istate->cache_nr)
3444ec2e WB	115	BUG("fsmonitor_dirty has more entries than the index (%"PRIuMAX" > %u)",
	116	(uintmax_t)istate->fsmonitor_dirty->bit_size, istate->cache_nr);
	117
56c69100	118	put_be32(&hdr_version, INDEX_EXTENSION_VERSION2);
883e248b BP	119	strbuf_add(sb, &hdr_version, sizeof(uint32_t));
883e248b BP	120
56c69100 KW	121	strbuf_addstr(sb, istate->fsmonitor_last_update);
	122	strbuf_addch(sb, 0); /* Want to keep a NUL */
	123
883e248b BP	124	fixup = sb->len;
	125	strbuf_add(sb, &ewah_size, sizeof(uint32_t)); /* we'll fix this up later */
	126
	127	ewah_start = sb->len;
3bd28eb2 AV	128	ewah_serialize_strbuf(istate->fsmonitor_dirty, sb);
	129	ewah_free(istate->fsmonitor_dirty);
	130	istate->fsmonitor_dirty = NULL;
883e248b BP	131
	132	/* fix up size field */
	133	put_be32(&ewah_size, sb->len - ewah_start);
	134	memcpy(sb->buf + fixup, &ewah_size, sizeof(uint32_t));
	135
	136	trace_printf_key(&trace_fsmonitor, "write fsmonitor extension successful");
	137	}
	138
	139	/*
56c69100	140	* Call the query-fsmonitor hook passing the last update token of the saved results.
883e248b	141	*/
56c69100	142	static int query_fsmonitor(int version, const char last_update, struct strbuf query_result)
883e248b BP	143	{
883e248b BP	144	struct child_process cp = CHILD_PROCESS_INIT;
883e248b	145
735e4173	146	if (!core_fsmonitor)
883e248b BP	147	return -1;
883e248b BP	148
735e4173 RS	149	argv_array_push(&cp.args, core_fsmonitor);
735e4173 RS	150	argv_array_pushf(&cp.args, "%d", version);
56c69100	151	argv_array_pushf(&cp.args, "%s", last_update);
883e248b	152	cp.use_shell = 1;
11cf33be	153	cp.dir = get_git_work_tree();
883e248b BP	154
	155	return capture_command(&cp, query_result, 1024);
	156	}
	157
	158	static void fsmonitor_refresh_callback(struct index_state istate, const char name)
	159	{
	160	int pos = index_name_pos(istate, name, strlen(name));
	161
	162	if (pos >= 0) {
	163	struct cache_entry *ce = istate->cache[pos];
	164	ce->ce_flags &= ~CE_FSMONITOR_VALID;
	165	}
	166
	167	/*
	168	* Mark the untracked cache dirty even if it wasn't found in the index
	169	* as it could be a new untracked file.
	170	*/
	171	trace_printf_key(&trace_fsmonitor, "fsmonitor_refresh_callback '%s'", name);
0cacebf0	172	untracked_cache_invalidate_path(istate, name, 0);
883e248b BP	173	}
	174
	175	void refresh_fsmonitor(struct index_state *istate)
	176	{
883e248b	177	struct strbuf query_result = STRBUF_INIT;
8da2c576 KW	178	int query_success = 0, hook_version = -1;
8da2c576 KW	179	size_t bol = 0; /* beginning of line */
883e248b	180	uint64_t last_update;
56c69100	181	struct strbuf last_update_token = STRBUF_INIT;
883e248b	182	char *buf;
5d137fc2	183	unsigned int i;
883e248b	184
398a3b08	185	if (!core_fsmonitor \|\| istate->fsmonitor_has_run_once)
883e248b	186	return;
8da2c576 KW	187
	188	hook_version = fsmonitor_hook_version();
	189
398a3b08	190	istate->fsmonitor_has_run_once = 1;
883e248b BP	191
	192	trace_printf_key(&trace_fsmonitor, "refresh fsmonitor");
	193	/*
	194	* This could be racy so save the date/time now and query_fsmonitor
	195	* should be inclusive to ensure we don't miss potential changes.
	196	*/
	197	last_update = getnanotime();
8da2c576 KW	198	if (hook_version == HOOK_INTERFACE_VERSION1)
8da2c576 KW	199	strbuf_addf(&last_update_token, "%"PRIu64"", last_update);
883e248b BP	200
883e248b BP	201	/*
8da2c576 KW	202	* If we have a last update token, call query_fsmonitor for the set of
8da2c576 KW	203	* changes since that token, else assume everything is possibly dirty
883e248b BP	204	* and check it all.
	205	*/
	206	if (istate->fsmonitor_last_update) {
8da2c576 KW	207	if (hook_version == -1 \|\| hook_version == HOOK_INTERFACE_VERSION2) {
	208	query_success = !query_fsmonitor(HOOK_INTERFACE_VERSION2,
	209	istate->fsmonitor_last_update, &query_result);
	210
	211	if (query_success) {
	212	if (hook_version < 0)
	213	hook_version = HOOK_INTERFACE_VERSION2;
	214
	215	/*
	216	* First entry will be the last update token
	217	* Need to use a char * variable because static
	218	* analysis was suggesting to use strbuf_addbuf
	219	* but we don't want to copy the entire strbuf
	220	* only the the chars up to the first NUL
	221	*/
	222	buf = query_result.buf;
	223	strbuf_addstr(&last_update_token, buf);
	224	if (!last_update_token.len) {
	225	warning("Empty last update token.");
	226	query_success = 0;
	227	} else {
	228	bol = last_update_token.len + 1;
	229	}
	230	} else if (hook_version < 0) {
	231	hook_version = HOOK_INTERFACE_VERSION1;
	232	if (!last_update_token.len)
	233	strbuf_addf(&last_update_token, "%"PRIu64"", last_update);
	234	}
	235	}
	236
	237	if (hook_version == HOOK_INTERFACE_VERSION1) {
	238	query_success = !query_fsmonitor(HOOK_INTERFACE_VERSION1,
	239	istate->fsmonitor_last_update, &query_result);
	240	}
	241
883e248b BP	242	trace_performance_since(last_update, "fsmonitor process '%s'", core_fsmonitor);
	243	trace_printf_key(&trace_fsmonitor, "fsmonitor process '%s' returned %s",
	244	core_fsmonitor, query_success ? "success" : "failure");
	245	}
	246
	247	/* a fsmonitor process can return '/' to indicate all entries are invalid */
8da2c576	248	if (query_success && query_result.buf[bol] != '/') {
883e248b BP	249	/* Mark all entries returned by the monitor as dirty */
883e248b BP	250	buf = query_result.buf;
8da2c576	251	for (i = bol; i < query_result.len; i++) {
883e248b BP	252	if (buf[i] != '\0')
	253	continue;
	254	fsmonitor_refresh_callback(istate, buf + bol);
	255	bol = i + 1;
	256	}
	257	if (bol < query_result.len)
	258	fsmonitor_refresh_callback(istate, buf + bol);
679f2f9f US	259
	260	/* Now mark the untracked cache for fsmonitor usage */
	261	if (istate->untracked)
	262	istate->untracked->use_fsmonitor = 1;
883e248b	263	} else {
679f2f9f US	264
	265	/* We only want to run the post index changed hook if we've actually changed entries, so keep track
	266	* if we actually changed entries or not */
	267	int is_cache_changed = 0;
883e248b	268	/* Mark all entries invalid */
679f2f9f US	269	for (i = 0; i < istate->cache_nr; i++) {
	270	if (istate->cache[i]->ce_flags & CE_FSMONITOR_VALID) {
	271	is_cache_changed = 1;
	272	istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID;
	273	}
	274	}
883e248b	275
ca598d5f	276	/* If we're going to check every file, ensure we save the results */
679f2f9f US	277	if (is_cache_changed)
679f2f9f US	278	istate->cache_changed \|= FSMONITOR_CHANGED;
ca598d5f	279
883e248b BP	280	if (istate->untracked)
	281	istate->untracked->use_fsmonitor = 0;
	282	}
	283	strbuf_release(&query_result);
	284
56c69100 KW	285	/* Now that we've updated istate, save the last_update_token */
	286	FREE_AND_NULL(istate->fsmonitor_last_update);
	287	istate->fsmonitor_last_update = strbuf_detach(&last_update_token, NULL);
883e248b BP	288	}
	289
	290	void add_fsmonitor(struct index_state *istate)
	291	{
5d137fc2	292	unsigned int i;
56c69100	293	struct strbuf last_update = STRBUF_INIT;
883e248b BP	294
	295	if (!istate->fsmonitor_last_update) {
	296	trace_printf_key(&trace_fsmonitor, "add fsmonitor");
	297	istate->cache_changed \|= FSMONITOR_CHANGED;
56c69100 KW	298	strbuf_addf(&last_update, "%"PRIu64"", getnanotime());
56c69100 KW	299	istate->fsmonitor_last_update = strbuf_detach(&last_update, NULL);
883e248b BP	300
	301	/* reset the fsmonitor state */
	302	for (i = 0; i < istate->cache_nr; i++)
	303	istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID;
	304
	305	/* reset the untracked cache */
	306	if (istate->untracked) {
	307	add_untracked_cache(istate);
	308	istate->untracked->use_fsmonitor = 1;
	309	}
	310
	311	/* Update the fsmonitor state */
	312	refresh_fsmonitor(istate);
	313	}
	314	}
	315
	316	void remove_fsmonitor(struct index_state *istate)
	317	{
	318	if (istate->fsmonitor_last_update) {
	319	trace_printf_key(&trace_fsmonitor, "remove fsmonitor");
	320	istate->cache_changed \|= FSMONITOR_CHANGED;
56c69100	321	FREE_AND_NULL(istate->fsmonitor_last_update);
883e248b BP	322	}
	323	}
	324
	325	void tweak_fsmonitor(struct index_state *istate)
	326	{
5d137fc2	327	unsigned int i;
ba1b9cac AV	328	int fsmonitor_enabled = git_config_get_fsmonitor();
	329
	330	if (istate->fsmonitor_dirty) {
	331	if (fsmonitor_enabled) {
	332	/* Mark all entries valid */
	333	for (i = 0; i < istate->cache_nr; i++) {
	334	istate->cache[i]->ce_flags \|= CE_FSMONITOR_VALID;
	335	}
	336
	337	/* Mark all previously saved entries as dirty */
3444ec2e WB	338	if (istate->fsmonitor_dirty->bit_size > istate->cache_nr)
	339	BUG("fsmonitor_dirty has more entries than the index (%"PRIuMAX" > %u)",
	340	(uintmax_t)istate->fsmonitor_dirty->bit_size, istate->cache_nr);
ba1b9cac AV	341	ewah_each_bit(istate->fsmonitor_dirty, fsmonitor_ewah_callback, istate);
ba1b9cac AV	342
679f2f9f	343	refresh_fsmonitor(istate);
ba1b9cac AV	344	}
	345
	346	ewah_free(istate->fsmonitor_dirty);
	347	istate->fsmonitor_dirty = NULL;
	348	}
	349
	350	switch (fsmonitor_enabled) {
883e248b BP	351	case -1: /* keep: do nothing */
	352	break;
	353	case 0: /* false */
	354	remove_fsmonitor(istate);
	355	break;
	356	case 1: /* true */
	357	add_fsmonitor(istate);
	358	break;
	359	default: /* unknown value: do nothing */
	360	break;
	361	}
	362	}