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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; | |
3444ec2e | 17 | struct cache_entry *ce; |
883e248b | 18 | |
3444ec2e WB |
19 | if (pos >= istate->cache_nr) |
20 | BUG("fsmonitor_dirty has more entries than the index (%"PRIuMAX" >= %u)", | |
21 | (uintmax_t)pos, istate->cache_nr); | |
22 | ||
23 | ce = istate->cache[pos]; | |
883e248b BP |
24 | ce->ce_flags &= ~CE_FSMONITOR_VALID; |
25 | } | |
26 | ||
27 | int read_fsmonitor_extension(struct index_state *istate, const void *data, | |
28 | unsigned long sz) | |
29 | { | |
30 | const char *index = data; | |
31 | uint32_t hdr_version; | |
32 | uint32_t ewah_size; | |
33 | struct ewah_bitmap *fsmonitor_dirty; | |
883e248b BP |
34 | int ret; |
35 | ||
36 | if (sz < sizeof(uint32_t) + sizeof(uint64_t) + sizeof(uint32_t)) | |
37 | return error("corrupt fsmonitor extension (too short)"); | |
38 | ||
39 | hdr_version = get_be32(index); | |
40 | index += sizeof(uint32_t); | |
41 | if (hdr_version != INDEX_EXTENSION_VERSION) | |
42 | return error("bad fsmonitor version %d", hdr_version); | |
43 | ||
44 | istate->fsmonitor_last_update = get_be64(index); | |
45 | index += sizeof(uint64_t); | |
46 | ||
47 | ewah_size = get_be32(index); | |
48 | index += sizeof(uint32_t); | |
49 | ||
50 | fsmonitor_dirty = ewah_new(); | |
51 | ret = ewah_read_mmap(fsmonitor_dirty, index, ewah_size); | |
52 | if (ret != ewah_size) { | |
53 | ewah_free(fsmonitor_dirty); | |
54 | return error("failed to parse ewah bitmap reading fsmonitor index extension"); | |
55 | } | |
ba1b9cac | 56 | istate->fsmonitor_dirty = fsmonitor_dirty; |
883e248b | 57 | |
3444ec2e WB |
58 | if (istate->fsmonitor_dirty->bit_size > istate->cache_nr) |
59 | BUG("fsmonitor_dirty has more entries than the index (%"PRIuMAX" > %u)", | |
60 | (uintmax_t)istate->fsmonitor_dirty->bit_size, istate->cache_nr); | |
61 | ||
883e248b BP |
62 | trace_printf_key(&trace_fsmonitor, "read fsmonitor extension successful"); |
63 | return 0; | |
64 | } | |
65 | ||
3bd28eb2 AV |
66 | void fill_fsmonitor_bitmap(struct index_state *istate) |
67 | { | |
3444ec2e | 68 | unsigned int i, skipped = 0; |
3bd28eb2 | 69 | istate->fsmonitor_dirty = ewah_new(); |
3444ec2e WB |
70 | for (i = 0; i < istate->cache_nr; i++) { |
71 | if (istate->cache[i]->ce_flags & CE_REMOVE) | |
72 | skipped++; | |
73 | else if (!(istate->cache[i]->ce_flags & CE_FSMONITOR_VALID)) | |
74 | ewah_set(istate->fsmonitor_dirty, i - skipped); | |
75 | } | |
3bd28eb2 AV |
76 | } |
77 | ||
883e248b BP |
78 | void write_fsmonitor_extension(struct strbuf *sb, struct index_state *istate) |
79 | { | |
80 | uint32_t hdr_version; | |
81 | uint64_t tm; | |
883e248b BP |
82 | uint32_t ewah_start; |
83 | uint32_t ewah_size = 0; | |
84 | int fixup = 0; | |
85 | ||
3444ec2e WB |
86 | if (istate->fsmonitor_dirty->bit_size > istate->cache_nr) |
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 | put_be32(&hdr_version, INDEX_EXTENSION_VERSION); |
91 | strbuf_add(sb, &hdr_version, sizeof(uint32_t)); | |
92 | ||
93 | put_be64(&tm, istate->fsmonitor_last_update); | |
94 | strbuf_add(sb, &tm, sizeof(uint64_t)); | |
95 | fixup = sb->len; | |
96 | strbuf_add(sb, &ewah_size, sizeof(uint32_t)); /* we'll fix this up later */ | |
97 | ||
98 | ewah_start = sb->len; | |
3bd28eb2 AV |
99 | ewah_serialize_strbuf(istate->fsmonitor_dirty, sb); |
100 | ewah_free(istate->fsmonitor_dirty); | |
101 | istate->fsmonitor_dirty = NULL; | |
883e248b BP |
102 | |
103 | /* fix up size field */ | |
104 | put_be32(&ewah_size, sb->len - ewah_start); | |
105 | memcpy(sb->buf + fixup, &ewah_size, sizeof(uint32_t)); | |
106 | ||
107 | trace_printf_key(&trace_fsmonitor, "write fsmonitor extension successful"); | |
108 | } | |
109 | ||
110 | /* | |
111 | * Call the query-fsmonitor hook passing the time of the last saved results. | |
112 | */ | |
113 | static int query_fsmonitor(int version, uint64_t last_update, struct strbuf *query_result) | |
114 | { | |
115 | struct child_process cp = CHILD_PROCESS_INIT; | |
883e248b | 116 | |
735e4173 | 117 | if (!core_fsmonitor) |
883e248b BP |
118 | return -1; |
119 | ||
735e4173 RS |
120 | argv_array_push(&cp.args, core_fsmonitor); |
121 | argv_array_pushf(&cp.args, "%d", version); | |
122 | argv_array_pushf(&cp.args, "%" PRIuMAX, (uintmax_t)last_update); | |
883e248b | 123 | cp.use_shell = 1; |
11cf33be | 124 | cp.dir = get_git_work_tree(); |
883e248b BP |
125 | |
126 | return capture_command(&cp, query_result, 1024); | |
127 | } | |
128 | ||
129 | static void fsmonitor_refresh_callback(struct index_state *istate, const char *name) | |
130 | { | |
131 | int pos = index_name_pos(istate, name, strlen(name)); | |
132 | ||
133 | if (pos >= 0) { | |
134 | struct cache_entry *ce = istate->cache[pos]; | |
135 | ce->ce_flags &= ~CE_FSMONITOR_VALID; | |
136 | } | |
137 | ||
138 | /* | |
139 | * Mark the untracked cache dirty even if it wasn't found in the index | |
140 | * as it could be a new untracked file. | |
141 | */ | |
142 | trace_printf_key(&trace_fsmonitor, "fsmonitor_refresh_callback '%s'", name); | |
0cacebf0 | 143 | untracked_cache_invalidate_path(istate, name, 0); |
883e248b BP |
144 | } |
145 | ||
146 | void refresh_fsmonitor(struct index_state *istate) | |
147 | { | |
883e248b BP |
148 | struct strbuf query_result = STRBUF_INIT; |
149 | int query_success = 0; | |
150 | size_t bol; /* beginning of line */ | |
151 | uint64_t last_update; | |
152 | char *buf; | |
5d137fc2 | 153 | unsigned int i; |
883e248b | 154 | |
398a3b08 | 155 | if (!core_fsmonitor || istate->fsmonitor_has_run_once) |
883e248b | 156 | return; |
398a3b08 | 157 | istate->fsmonitor_has_run_once = 1; |
883e248b BP |
158 | |
159 | trace_printf_key(&trace_fsmonitor, "refresh fsmonitor"); | |
160 | /* | |
161 | * This could be racy so save the date/time now and query_fsmonitor | |
162 | * should be inclusive to ensure we don't miss potential changes. | |
163 | */ | |
164 | last_update = getnanotime(); | |
165 | ||
166 | /* | |
167 | * If we have a last update time, call query_fsmonitor for the set of | |
168 | * changes since that time, else assume everything is possibly dirty | |
169 | * and check it all. | |
170 | */ | |
171 | if (istate->fsmonitor_last_update) { | |
172 | query_success = !query_fsmonitor(HOOK_INTERFACE_VERSION, | |
173 | istate->fsmonitor_last_update, &query_result); | |
174 | trace_performance_since(last_update, "fsmonitor process '%s'", core_fsmonitor); | |
175 | trace_printf_key(&trace_fsmonitor, "fsmonitor process '%s' returned %s", | |
176 | core_fsmonitor, query_success ? "success" : "failure"); | |
177 | } | |
178 | ||
179 | /* a fsmonitor process can return '/' to indicate all entries are invalid */ | |
180 | if (query_success && query_result.buf[0] != '/') { | |
181 | /* Mark all entries returned by the monitor as dirty */ | |
182 | buf = query_result.buf; | |
183 | bol = 0; | |
184 | for (i = 0; i < query_result.len; i++) { | |
185 | if (buf[i] != '\0') | |
186 | continue; | |
187 | fsmonitor_refresh_callback(istate, buf + bol); | |
188 | bol = i + 1; | |
189 | } | |
190 | if (bol < query_result.len) | |
191 | fsmonitor_refresh_callback(istate, buf + bol); | |
192 | } else { | |
193 | /* Mark all entries invalid */ | |
194 | for (i = 0; i < istate->cache_nr; i++) | |
195 | istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID; | |
196 | ||
ca598d5f BP |
197 | /* If we're going to check every file, ensure we save the results */ |
198 | istate->cache_changed |= FSMONITOR_CHANGED; | |
199 | ||
883e248b BP |
200 | if (istate->untracked) |
201 | istate->untracked->use_fsmonitor = 0; | |
202 | } | |
203 | strbuf_release(&query_result); | |
204 | ||
205 | /* Now that we've updated istate, save the last_update time */ | |
206 | istate->fsmonitor_last_update = last_update; | |
207 | } | |
208 | ||
209 | void add_fsmonitor(struct index_state *istate) | |
210 | { | |
5d137fc2 | 211 | unsigned int i; |
883e248b BP |
212 | |
213 | if (!istate->fsmonitor_last_update) { | |
214 | trace_printf_key(&trace_fsmonitor, "add fsmonitor"); | |
215 | istate->cache_changed |= FSMONITOR_CHANGED; | |
216 | istate->fsmonitor_last_update = getnanotime(); | |
217 | ||
218 | /* reset the fsmonitor state */ | |
219 | for (i = 0; i < istate->cache_nr; i++) | |
220 | istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID; | |
221 | ||
222 | /* reset the untracked cache */ | |
223 | if (istate->untracked) { | |
224 | add_untracked_cache(istate); | |
225 | istate->untracked->use_fsmonitor = 1; | |
226 | } | |
227 | ||
228 | /* Update the fsmonitor state */ | |
229 | refresh_fsmonitor(istate); | |
230 | } | |
231 | } | |
232 | ||
233 | void remove_fsmonitor(struct index_state *istate) | |
234 | { | |
235 | if (istate->fsmonitor_last_update) { | |
236 | trace_printf_key(&trace_fsmonitor, "remove fsmonitor"); | |
237 | istate->cache_changed |= FSMONITOR_CHANGED; | |
238 | istate->fsmonitor_last_update = 0; | |
239 | } | |
240 | } | |
241 | ||
242 | void tweak_fsmonitor(struct index_state *istate) | |
243 | { | |
5d137fc2 | 244 | unsigned int i; |
ba1b9cac AV |
245 | int fsmonitor_enabled = git_config_get_fsmonitor(); |
246 | ||
247 | if (istate->fsmonitor_dirty) { | |
248 | if (fsmonitor_enabled) { | |
249 | /* Mark all entries valid */ | |
250 | for (i = 0; i < istate->cache_nr; i++) { | |
251 | istate->cache[i]->ce_flags |= CE_FSMONITOR_VALID; | |
252 | } | |
253 | ||
254 | /* Mark all previously saved entries as dirty */ | |
3444ec2e WB |
255 | if (istate->fsmonitor_dirty->bit_size > istate->cache_nr) |
256 | BUG("fsmonitor_dirty has more entries than the index (%"PRIuMAX" > %u)", | |
257 | (uintmax_t)istate->fsmonitor_dirty->bit_size, istate->cache_nr); | |
ba1b9cac AV |
258 | ewah_each_bit(istate->fsmonitor_dirty, fsmonitor_ewah_callback, istate); |
259 | ||
260 | /* Now mark the untracked cache for fsmonitor usage */ | |
261 | if (istate->untracked) | |
262 | istate->untracked->use_fsmonitor = 1; | |
263 | } | |
264 | ||
265 | ewah_free(istate->fsmonitor_dirty); | |
266 | istate->fsmonitor_dirty = NULL; | |
267 | } | |
268 | ||
269 | switch (fsmonitor_enabled) { | |
883e248b BP |
270 | case -1: /* keep: do nothing */ |
271 | break; | |
272 | case 0: /* false */ | |
273 | remove_fsmonitor(istate); | |
274 | break; | |
275 | case 1: /* true */ | |
276 | add_fsmonitor(istate); | |
277 | break; | |
278 | default: /* unknown value: do nothing */ | |
279 | break; | |
280 | } | |
281 | } |