git/fsmonitor.c

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7.2 KiB
C
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#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_VERSION (1)
#define HOOK_INTERFACE_VERSION (1)
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 = istate->cache[pos];
ce->ce_flags &= ~CE_FSMONITOR_VALID;
}
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;
if (sz < sizeof(uint32_t) + sizeof(uint64_t) + sizeof(uint32_t))
return error("corrupt fsmonitor extension (too short)");
hdr_version = get_be32(index);
index += sizeof(uint32_t);
if (hdr_version != INDEX_EXTENSION_VERSION)
return error("bad fsmonitor version %d", hdr_version);
istate->fsmonitor_last_update = get_be64(index);
index += sizeof(uint64_t);
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;
trace_printf_key(&trace_fsmonitor, "read fsmonitor extension successful");
return 0;
}
void fill_fsmonitor_bitmap(struct index_state *istate)
{
int i;
istate->fsmonitor_dirty = ewah_new();
for (i = 0; i < istate->cache_nr; i++)
if (!(istate->cache[i]->ce_flags & CE_FSMONITOR_VALID))
ewah_set(istate->fsmonitor_dirty, i);
}
void write_fsmonitor_extension(struct strbuf *sb, struct index_state *istate)
{
uint32_t hdr_version;
uint64_t tm;
uint32_t ewah_start;
uint32_t ewah_size = 0;
int fixup = 0;
put_be32(&hdr_version, INDEX_EXTENSION_VERSION);
strbuf_add(sb, &hdr_version, sizeof(uint32_t));
put_be64(&tm, istate->fsmonitor_last_update);
strbuf_add(sb, &tm, sizeof(uint64_t));
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 time of the last saved results.
*/
static int query_fsmonitor(int version, uint64_t last_update, struct strbuf *query_result)
{
struct child_process cp = CHILD_PROCESS_INIT;
char ver[64];
char date[64];
const char *argv[4];
if (!(argv[0] = core_fsmonitor))
return -1;
snprintf(ver, sizeof(ver), "%d", version);
snprintf(date, sizeof(date), "%" PRIuMAX, (uintmax_t)last_update);
argv[1] = ver;
argv[2] = date;
argv[3] = NULL;
cp.argv = argv;
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)
{
static int has_run_once = 0;
struct strbuf query_result = STRBUF_INIT;
int query_success = 0;
size_t bol; /* beginning of line */
uint64_t last_update;
char *buf;
int i;
if (!core_fsmonitor || has_run_once)
return;
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 we have a last update time, call query_fsmonitor for the set of
* changes since that time, else assume everything is possibly dirty
* and check it all.
*/
if (istate->fsmonitor_last_update) {
query_success = !query_fsmonitor(HOOK_INTERFACE_VERSION,
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[0] != '/') {
/* Mark all entries returned by the monitor as dirty */
buf = query_result.buf;
bol = 0;
for (i = 0; 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);
} else {
/* Mark all entries invalid */
for (i = 0; i < istate->cache_nr; i++)
istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID;
/* If we're going to check every file, ensure we save the results */
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 time */
istate->fsmonitor_last_update = last_update;
}
void add_fsmonitor(struct index_state *istate)
{
int i;
if (!istate->fsmonitor_last_update) {
trace_printf_key(&trace_fsmonitor, "add fsmonitor");
istate->cache_changed |= FSMONITOR_CHANGED;
istate->fsmonitor_last_update = getnanotime();
/* 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;
istate->fsmonitor_last_update = 0;
}
}
void tweak_fsmonitor(struct index_state *istate)
{
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 */
ewah_each_bit(istate->fsmonitor_dirty, fsmonitor_ewah_callback, istate);
/* Now mark the untracked cache for fsmonitor usage */
if (istate->untracked)
istate->untracked->use_fsmonitor = 1;
}
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;
}
}