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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 | ||
9 | #define INDEX_EXTENSION_VERSION (1) | |
10 | #define HOOK_INTERFACE_VERSION (1) | |
11 | ||
12 | struct trace_key trace_fsmonitor = TRACE_KEY_INIT(FSMONITOR); | |
13 | ||
14 | static void fsmonitor_ewah_callback(size_t pos, void *is) | |
15 | { | |
16 | struct index_state *istate = (struct index_state *)is; | |
17 | struct cache_entry *ce = istate->cache[pos]; | |
18 | ||
19 | ce->ce_flags &= ~CE_FSMONITOR_VALID; | |
20 | } | |
21 | ||
22 | int read_fsmonitor_extension(struct index_state *istate, const void *data, | |
23 | unsigned long sz) | |
24 | { | |
25 | const char *index = data; | |
26 | uint32_t hdr_version; | |
27 | uint32_t ewah_size; | |
28 | struct ewah_bitmap *fsmonitor_dirty; | |
883e248b BP |
29 | int ret; |
30 | ||
31 | if (sz < sizeof(uint32_t) + sizeof(uint64_t) + sizeof(uint32_t)) | |
32 | return error("corrupt fsmonitor extension (too short)"); | |
33 | ||
34 | hdr_version = get_be32(index); | |
35 | index += sizeof(uint32_t); | |
36 | if (hdr_version != INDEX_EXTENSION_VERSION) | |
37 | return error("bad fsmonitor version %d", hdr_version); | |
38 | ||
39 | istate->fsmonitor_last_update = get_be64(index); | |
40 | index += sizeof(uint64_t); | |
41 | ||
42 | ewah_size = get_be32(index); | |
43 | index += sizeof(uint32_t); | |
44 | ||
45 | fsmonitor_dirty = ewah_new(); | |
46 | ret = ewah_read_mmap(fsmonitor_dirty, index, ewah_size); | |
47 | if (ret != ewah_size) { | |
48 | ewah_free(fsmonitor_dirty); | |
49 | return error("failed to parse ewah bitmap reading fsmonitor index extension"); | |
50 | } | |
ba1b9cac | 51 | istate->fsmonitor_dirty = fsmonitor_dirty; |
883e248b BP |
52 | |
53 | trace_printf_key(&trace_fsmonitor, "read fsmonitor extension successful"); | |
54 | return 0; | |
55 | } | |
56 | ||
3bd28eb2 AV |
57 | void fill_fsmonitor_bitmap(struct index_state *istate) |
58 | { | |
59 | int i; | |
60 | istate->fsmonitor_dirty = ewah_new(); | |
61 | for (i = 0; i < istate->cache_nr; i++) | |
62 | if (!(istate->cache[i]->ce_flags & CE_FSMONITOR_VALID)) | |
63 | ewah_set(istate->fsmonitor_dirty, i); | |
64 | } | |
65 | ||
883e248b BP |
66 | void write_fsmonitor_extension(struct strbuf *sb, struct index_state *istate) |
67 | { | |
68 | uint32_t hdr_version; | |
69 | uint64_t tm; | |
883e248b BP |
70 | uint32_t ewah_start; |
71 | uint32_t ewah_size = 0; | |
72 | int fixup = 0; | |
73 | ||
74 | put_be32(&hdr_version, INDEX_EXTENSION_VERSION); | |
75 | strbuf_add(sb, &hdr_version, sizeof(uint32_t)); | |
76 | ||
77 | put_be64(&tm, istate->fsmonitor_last_update); | |
78 | strbuf_add(sb, &tm, sizeof(uint64_t)); | |
79 | fixup = sb->len; | |
80 | strbuf_add(sb, &ewah_size, sizeof(uint32_t)); /* we'll fix this up later */ | |
81 | ||
82 | ewah_start = sb->len; | |
3bd28eb2 AV |
83 | ewah_serialize_strbuf(istate->fsmonitor_dirty, sb); |
84 | ewah_free(istate->fsmonitor_dirty); | |
85 | istate->fsmonitor_dirty = NULL; | |
883e248b BP |
86 | |
87 | /* fix up size field */ | |
88 | put_be32(&ewah_size, sb->len - ewah_start); | |
89 | memcpy(sb->buf + fixup, &ewah_size, sizeof(uint32_t)); | |
90 | ||
91 | trace_printf_key(&trace_fsmonitor, "write fsmonitor extension successful"); | |
92 | } | |
93 | ||
94 | /* | |
95 | * Call the query-fsmonitor hook passing the time of the last saved results. | |
96 | */ | |
97 | static int query_fsmonitor(int version, uint64_t last_update, struct strbuf *query_result) | |
98 | { | |
99 | struct child_process cp = CHILD_PROCESS_INIT; | |
883e248b | 100 | |
735e4173 | 101 | if (!core_fsmonitor) |
883e248b BP |
102 | return -1; |
103 | ||
735e4173 RS |
104 | argv_array_push(&cp.args, core_fsmonitor); |
105 | argv_array_pushf(&cp.args, "%d", version); | |
106 | argv_array_pushf(&cp.args, "%" PRIuMAX, (uintmax_t)last_update); | |
883e248b | 107 | cp.use_shell = 1; |
11cf33be | 108 | cp.dir = get_git_work_tree(); |
883e248b BP |
109 | |
110 | return capture_command(&cp, query_result, 1024); | |
111 | } | |
112 | ||
113 | static void fsmonitor_refresh_callback(struct index_state *istate, const char *name) | |
114 | { | |
115 | int pos = index_name_pos(istate, name, strlen(name)); | |
116 | ||
117 | if (pos >= 0) { | |
118 | struct cache_entry *ce = istate->cache[pos]; | |
119 | ce->ce_flags &= ~CE_FSMONITOR_VALID; | |
120 | } | |
121 | ||
122 | /* | |
123 | * Mark the untracked cache dirty even if it wasn't found in the index | |
124 | * as it could be a new untracked file. | |
125 | */ | |
126 | trace_printf_key(&trace_fsmonitor, "fsmonitor_refresh_callback '%s'", name); | |
0cacebf0 | 127 | untracked_cache_invalidate_path(istate, name, 0); |
883e248b BP |
128 | } |
129 | ||
130 | void refresh_fsmonitor(struct index_state *istate) | |
131 | { | |
883e248b BP |
132 | struct strbuf query_result = STRBUF_INIT; |
133 | int query_success = 0; | |
134 | size_t bol; /* beginning of line */ | |
135 | uint64_t last_update; | |
136 | char *buf; | |
137 | int i; | |
138 | ||
398a3b08 | 139 | if (!core_fsmonitor || istate->fsmonitor_has_run_once) |
883e248b | 140 | return; |
398a3b08 | 141 | istate->fsmonitor_has_run_once = 1; |
883e248b BP |
142 | |
143 | trace_printf_key(&trace_fsmonitor, "refresh fsmonitor"); | |
144 | /* | |
145 | * This could be racy so save the date/time now and query_fsmonitor | |
146 | * should be inclusive to ensure we don't miss potential changes. | |
147 | */ | |
148 | last_update = getnanotime(); | |
149 | ||
150 | /* | |
151 | * If we have a last update time, call query_fsmonitor for the set of | |
152 | * changes since that time, else assume everything is possibly dirty | |
153 | * and check it all. | |
154 | */ | |
155 | if (istate->fsmonitor_last_update) { | |
156 | query_success = !query_fsmonitor(HOOK_INTERFACE_VERSION, | |
157 | istate->fsmonitor_last_update, &query_result); | |
158 | trace_performance_since(last_update, "fsmonitor process '%s'", core_fsmonitor); | |
159 | trace_printf_key(&trace_fsmonitor, "fsmonitor process '%s' returned %s", | |
160 | core_fsmonitor, query_success ? "success" : "failure"); | |
161 | } | |
162 | ||
163 | /* a fsmonitor process can return '/' to indicate all entries are invalid */ | |
164 | if (query_success && query_result.buf[0] != '/') { | |
165 | /* Mark all entries returned by the monitor as dirty */ | |
166 | buf = query_result.buf; | |
167 | bol = 0; | |
168 | for (i = 0; i < query_result.len; i++) { | |
169 | if (buf[i] != '\0') | |
170 | continue; | |
171 | fsmonitor_refresh_callback(istate, buf + bol); | |
172 | bol = i + 1; | |
173 | } | |
174 | if (bol < query_result.len) | |
175 | fsmonitor_refresh_callback(istate, buf + bol); | |
176 | } else { | |
177 | /* Mark all entries invalid */ | |
178 | for (i = 0; i < istate->cache_nr; i++) | |
179 | istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID; | |
180 | ||
ca598d5f BP |
181 | /* If we're going to check every file, ensure we save the results */ |
182 | istate->cache_changed |= FSMONITOR_CHANGED; | |
183 | ||
883e248b BP |
184 | if (istate->untracked) |
185 | istate->untracked->use_fsmonitor = 0; | |
186 | } | |
187 | strbuf_release(&query_result); | |
188 | ||
189 | /* Now that we've updated istate, save the last_update time */ | |
190 | istate->fsmonitor_last_update = last_update; | |
191 | } | |
192 | ||
193 | void add_fsmonitor(struct index_state *istate) | |
194 | { | |
195 | int i; | |
196 | ||
197 | if (!istate->fsmonitor_last_update) { | |
198 | trace_printf_key(&trace_fsmonitor, "add fsmonitor"); | |
199 | istate->cache_changed |= FSMONITOR_CHANGED; | |
200 | istate->fsmonitor_last_update = getnanotime(); | |
201 | ||
202 | /* reset the fsmonitor state */ | |
203 | for (i = 0; i < istate->cache_nr; i++) | |
204 | istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID; | |
205 | ||
206 | /* reset the untracked cache */ | |
207 | if (istate->untracked) { | |
208 | add_untracked_cache(istate); | |
209 | istate->untracked->use_fsmonitor = 1; | |
210 | } | |
211 | ||
212 | /* Update the fsmonitor state */ | |
213 | refresh_fsmonitor(istate); | |
214 | } | |
215 | } | |
216 | ||
217 | void remove_fsmonitor(struct index_state *istate) | |
218 | { | |
219 | if (istate->fsmonitor_last_update) { | |
220 | trace_printf_key(&trace_fsmonitor, "remove fsmonitor"); | |
221 | istate->cache_changed |= FSMONITOR_CHANGED; | |
222 | istate->fsmonitor_last_update = 0; | |
223 | } | |
224 | } | |
225 | ||
226 | void tweak_fsmonitor(struct index_state *istate) | |
227 | { | |
ba1b9cac AV |
228 | int i; |
229 | int fsmonitor_enabled = git_config_get_fsmonitor(); | |
230 | ||
231 | if (istate->fsmonitor_dirty) { | |
232 | if (fsmonitor_enabled) { | |
233 | /* Mark all entries valid */ | |
234 | for (i = 0; i < istate->cache_nr; i++) { | |
235 | istate->cache[i]->ce_flags |= CE_FSMONITOR_VALID; | |
236 | } | |
237 | ||
238 | /* Mark all previously saved entries as dirty */ | |
239 | ewah_each_bit(istate->fsmonitor_dirty, fsmonitor_ewah_callback, istate); | |
240 | ||
241 | /* Now mark the untracked cache for fsmonitor usage */ | |
242 | if (istate->untracked) | |
243 | istate->untracked->use_fsmonitor = 1; | |
244 | } | |
245 | ||
246 | ewah_free(istate->fsmonitor_dirty); | |
247 | istate->fsmonitor_dirty = NULL; | |
248 | } | |
249 | ||
250 | switch (fsmonitor_enabled) { | |
883e248b BP |
251 | case -1: /* keep: do nothing */ |
252 | break; | |
253 | case 0: /* false */ | |
254 | remove_fsmonitor(istate); | |
255 | break; | |
256 | case 1: /* true */ | |
257 | add_fsmonitor(istate); | |
258 | break; | |
259 | default: /* unknown value: do nothing */ | |
260 | break; | |
261 | } | |
262 | } |