Squashed 'third_party/git/' content from commit cb71568594
git-subtree-dir: third_party/git git-subtree-split: cb715685942260375e1eb8153b0768a376e4ece7
This commit is contained in:
Vincent Ambo
commit
1b593e1ea4
3629 changed files with 1139935 additions and 0 deletions
262
fsmonitor.c
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262
fsmonitor.c
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#include "cache.h"
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#include "config.h"
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#include "dir.h"
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#include "ewah/ewok.h"
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#include "fsmonitor.h"
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#include "run-command.h"
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#include "strbuf.h"
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#define INDEX_EXTENSION_VERSION (1)
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#define HOOK_INTERFACE_VERSION (1)
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struct trace_key trace_fsmonitor = TRACE_KEY_INIT(FSMONITOR);
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static void fsmonitor_ewah_callback(size_t pos, void *is)
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{
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struct index_state *istate = (struct index_state *)is;
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struct cache_entry *ce = istate->cache[pos];
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ce->ce_flags &= ~CE_FSMONITOR_VALID;
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}
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int read_fsmonitor_extension(struct index_state *istate, const void *data,
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unsigned long sz)
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{
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const char *index = data;
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uint32_t hdr_version;
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uint32_t ewah_size;
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struct ewah_bitmap *fsmonitor_dirty;
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int ret;
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if (sz < sizeof(uint32_t) + sizeof(uint64_t) + sizeof(uint32_t))
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return error("corrupt fsmonitor extension (too short)");
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hdr_version = get_be32(index);
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index += sizeof(uint32_t);
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if (hdr_version != INDEX_EXTENSION_VERSION)
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return error("bad fsmonitor version %d", hdr_version);
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istate->fsmonitor_last_update = get_be64(index);
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index += sizeof(uint64_t);
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ewah_size = get_be32(index);
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index += sizeof(uint32_t);
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fsmonitor_dirty = ewah_new();
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ret = ewah_read_mmap(fsmonitor_dirty, index, ewah_size);
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if (ret != ewah_size) {
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ewah_free(fsmonitor_dirty);
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return error("failed to parse ewah bitmap reading fsmonitor index extension");
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}
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istate->fsmonitor_dirty = fsmonitor_dirty;
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trace_printf_key(&trace_fsmonitor, "read fsmonitor extension successful");
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return 0;
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}
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void fill_fsmonitor_bitmap(struct index_state *istate)
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{
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unsigned int i;
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istate->fsmonitor_dirty = ewah_new();
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for (i = 0; i < istate->cache_nr; i++)
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if (!(istate->cache[i]->ce_flags & CE_FSMONITOR_VALID))
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ewah_set(istate->fsmonitor_dirty, i);
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}
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void write_fsmonitor_extension(struct strbuf *sb, struct index_state *istate)
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{
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uint32_t hdr_version;
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uint64_t tm;
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uint32_t ewah_start;
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uint32_t ewah_size = 0;
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int fixup = 0;
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put_be32(&hdr_version, INDEX_EXTENSION_VERSION);
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strbuf_add(sb, &hdr_version, sizeof(uint32_t));
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put_be64(&tm, istate->fsmonitor_last_update);
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strbuf_add(sb, &tm, sizeof(uint64_t));
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fixup = sb->len;
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strbuf_add(sb, &ewah_size, sizeof(uint32_t)); /* we'll fix this up later */
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ewah_start = sb->len;
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ewah_serialize_strbuf(istate->fsmonitor_dirty, sb);
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ewah_free(istate->fsmonitor_dirty);
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istate->fsmonitor_dirty = NULL;
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/* fix up size field */
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put_be32(&ewah_size, sb->len - ewah_start);
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memcpy(sb->buf + fixup, &ewah_size, sizeof(uint32_t));
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trace_printf_key(&trace_fsmonitor, "write fsmonitor extension successful");
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}
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/*
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* Call the query-fsmonitor hook passing the time of the last saved results.
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*/
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static int query_fsmonitor(int version, uint64_t last_update, struct strbuf *query_result)
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{
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struct child_process cp = CHILD_PROCESS_INIT;
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if (!core_fsmonitor)
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return -1;
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argv_array_push(&cp.args, core_fsmonitor);
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argv_array_pushf(&cp.args, "%d", version);
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argv_array_pushf(&cp.args, "%" PRIuMAX, (uintmax_t)last_update);
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cp.use_shell = 1;
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cp.dir = get_git_work_tree();
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return capture_command(&cp, query_result, 1024);
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}
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static void fsmonitor_refresh_callback(struct index_state *istate, const char *name)
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{
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int pos = index_name_pos(istate, name, strlen(name));
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if (pos >= 0) {
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struct cache_entry *ce = istate->cache[pos];
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ce->ce_flags &= ~CE_FSMONITOR_VALID;
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}
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/*
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* Mark the untracked cache dirty even if it wasn't found in the index
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* as it could be a new untracked file.
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*/
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trace_printf_key(&trace_fsmonitor, "fsmonitor_refresh_callback '%s'", name);
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untracked_cache_invalidate_path(istate, name, 0);
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}
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void refresh_fsmonitor(struct index_state *istate)
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{
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struct strbuf query_result = STRBUF_INIT;
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int query_success = 0;
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size_t bol; /* beginning of line */
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uint64_t last_update;
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char *buf;
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unsigned int i;
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if (!core_fsmonitor || istate->fsmonitor_has_run_once)
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return;
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istate->fsmonitor_has_run_once = 1;
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trace_printf_key(&trace_fsmonitor, "refresh fsmonitor");
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/*
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* This could be racy so save the date/time now and query_fsmonitor
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* should be inclusive to ensure we don't miss potential changes.
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*/
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last_update = getnanotime();
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/*
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* If we have a last update time, call query_fsmonitor for the set of
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* changes since that time, else assume everything is possibly dirty
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* and check it all.
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*/
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if (istate->fsmonitor_last_update) {
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query_success = !query_fsmonitor(HOOK_INTERFACE_VERSION,
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istate->fsmonitor_last_update, &query_result);
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trace_performance_since(last_update, "fsmonitor process '%s'", core_fsmonitor);
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trace_printf_key(&trace_fsmonitor, "fsmonitor process '%s' returned %s",
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core_fsmonitor, query_success ? "success" : "failure");
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}
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/* a fsmonitor process can return '/' to indicate all entries are invalid */
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if (query_success && query_result.buf[0] != '/') {
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/* Mark all entries returned by the monitor as dirty */
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buf = query_result.buf;
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bol = 0;
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for (i = 0; i < query_result.len; i++) {
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if (buf[i] != '\0')
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continue;
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fsmonitor_refresh_callback(istate, buf + bol);
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bol = i + 1;
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}
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if (bol < query_result.len)
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fsmonitor_refresh_callback(istate, buf + bol);
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} else {
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/* Mark all entries invalid */
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for (i = 0; i < istate->cache_nr; i++)
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istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID;
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/* If we're going to check every file, ensure we save the results */
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istate->cache_changed |= FSMONITOR_CHANGED;
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if (istate->untracked)
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istate->untracked->use_fsmonitor = 0;
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}
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strbuf_release(&query_result);
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/* Now that we've updated istate, save the last_update time */
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istate->fsmonitor_last_update = last_update;
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}
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void add_fsmonitor(struct index_state *istate)
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{
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unsigned int i;
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if (!istate->fsmonitor_last_update) {
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trace_printf_key(&trace_fsmonitor, "add fsmonitor");
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istate->cache_changed |= FSMONITOR_CHANGED;
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istate->fsmonitor_last_update = getnanotime();
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/* reset the fsmonitor state */
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for (i = 0; i < istate->cache_nr; i++)
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istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID;
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/* reset the untracked cache */
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if (istate->untracked) {
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add_untracked_cache(istate);
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istate->untracked->use_fsmonitor = 1;
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}
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/* Update the fsmonitor state */
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refresh_fsmonitor(istate);
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}
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}
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void remove_fsmonitor(struct index_state *istate)
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{
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if (istate->fsmonitor_last_update) {
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trace_printf_key(&trace_fsmonitor, "remove fsmonitor");
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istate->cache_changed |= FSMONITOR_CHANGED;
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istate->fsmonitor_last_update = 0;
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}
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}
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void tweak_fsmonitor(struct index_state *istate)
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{
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unsigned int i;
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int fsmonitor_enabled = git_config_get_fsmonitor();
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if (istate->fsmonitor_dirty) {
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if (fsmonitor_enabled) {
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/* Mark all entries valid */
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for (i = 0; i < istate->cache_nr; i++) {
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istate->cache[i]->ce_flags |= CE_FSMONITOR_VALID;
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}
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/* Mark all previously saved entries as dirty */
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ewah_each_bit(istate->fsmonitor_dirty, fsmonitor_ewah_callback, istate);
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/* Now mark the untracked cache for fsmonitor usage */
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if (istate->untracked)
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istate->untracked->use_fsmonitor = 1;
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}
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ewah_free(istate->fsmonitor_dirty);
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istate->fsmonitor_dirty = NULL;
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}
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switch (fsmonitor_enabled) {
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case -1: /* keep: do nothing */
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break;
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case 0: /* false */
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remove_fsmonitor(istate);
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break;
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case 1: /* true */
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add_fsmonitor(istate);
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break;
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default: /* unknown value: do nothing */
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break;
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}
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}
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