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/cvs/IO-AIO/AIO.xs
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Comparing IO-AIO/AIO.xs (file contents):
Revision 1.219 by root, Fri Jul 27 18:43:25 2012 UTC vs.
Revision 1.221 by root, Wed Aug 22 22:28:03 2012 UTC

… …
165fiemap (eio_req *req) 165fiemap (eio_req *req)
166{ 166{
167 req->result = -1; 167 req->result = -1;
168 168
169#if HAVE_FIEMAP 169#if HAVE_FIEMAP
170 /* assume some c99 */
171 struct fiemap *fiemap = 0;
172 size_t end_offset;
170 int count = req->int3; 173 int count = req->int3;
171 174
172 /* heuristic: first try with 72 extents if we don't know how many, */ 175 req->flags |= EIO_FLAG_PTR1_FREE;
173 /* as most files have (hopefully) fewer than this many extents */ 176
174 /* in fact, most should have <= 2, so the 72 below is probably overkill */ 177 /* heuristic: start with 512 bytes (8 extents), and if that isn't enough, */
178 /* increase in 3.5kb steps */
175 if (count < 0) 179 if (count < 0)
176 count = 72; /* for what it's worth, 72 extents fit nicely into 4kb */ 180 count = 8;
181
182 fiemap = malloc (sizeof (*fiemap) + sizeof (struct fiemap_extent) * count);
183 errno = ENOMEM;
184 if (!fiemap)
185 return;
186
187 req->ptr1 = fiemap;
188
189 fiemap->fm_start = req->offs;
190 fiemap->fm_length = req->size;
191 fiemap->fm_flags = req->int2;
192 fiemap->fm_extent_count = count;
193
194 if (ioctl (req->int1, FS_IOC_FIEMAP, fiemap))
195 return;
196
197 if (req->int3 >= 0 /* not autosizing */
198 || !fiemap->fm_mapped_extents /* no more extents */
199 || fiemap->fm_extents [fiemap->fm_mapped_extents - 1].fe_flags & FIEMAP_EXTENT_LAST /* hit eof */)
200 goto done;
201
202 /* else we have to loop -
203 * it would be tempting (atcually I tried that first) to just query the
204 * number of extents needed, but linux often feels like not returning all
205 * extents, without telling us it left any out. this complicates
206 * this quite a bit.
207 */
208
209 end_offset = fiemap->fm_length + (fiemap->fm_length == FIEMAP_MAX_OFFSET ? 0 : fiemap->fm_start);
177 210
178 for (;;) 211 for (;;)
179 { 212 {
213 /* we go in 54 extent steps - 3kb, in the hope that this fits nicely on the eio stack (normally 16+ kb) */
214 char scratch[3072];
215 struct fiemap *incmap = (struct fiemap *)scratch;
216
217 incmap->fm_start = fiemap->fm_extents [fiemap->fm_mapped_extents - 1].fe_logical
218 + fiemap->fm_extents [fiemap->fm_mapped_extents - 1].fe_length;
219 incmap->fm_length = fiemap->fm_length - (incmap->fm_start - fiemap->fm_start);
220 incmap->fm_flags = fiemap->fm_flags;
221 incmap->fm_extent_count = (sizeof (scratch) - sizeof (struct fiemap)) / sizeof (struct fiemap_extent);
222
223 if (ioctl (req->int1, FS_IOC_FIEMAP, incmap))
224 return;
225
226 count = fiemap->fm_mapped_extents + incmap->fm_mapped_extents;
180 struct fiemap *fiemap = malloc (sizeof (*fiemap) + sizeof (struct fiemap_extent) * count); 227 fiemap = realloc (fiemap, sizeof (*fiemap) + sizeof (struct fiemap_extent) * count);
181 errno = ENOMEM; 228 errno = ENOMEM;
182 if (!fiemap) 229 if (!fiemap)
183 return; 230 return;
184 231
185 req->ptr1 = fiemap; 232 req->ptr1 = fiemap;
186 req->flags |= EIO_FLAG_PTR1_FREE;
187 233
188 fiemap->fm_start = req->offs; 234 for (count = 0; count < incmap->fm_mapped_extents; ++count)
189 fiemap->fm_length = req->size; 235 {
190 fiemap->fm_flags = req->int2; 236 struct fiemap_extent *e = incmap->fm_extents + count;
191 fiemap->fm_extent_count = count;
192 237
193 if (ioctl (req->int1, FS_IOC_FIEMAP, fiemap)) 238 if (e->fe_logical + e->fe_length >= end_offset)
194 return; 239 goto done;
195 240
196 if (req->int3 >= 0) 241 fiemap->fm_extents [fiemap->fm_mapped_extents++] = *e;
197 break; /* when not autosizing we are done */
198 242
199 if (fiemap->fm_mapped_extents < count) 243 if (e->fe_flags & FIEMAP_EXTENT_LAST)
200 /* either autosizing succeeded, 244 goto done;
201 * or the file had no extents
202 * or we luckily had enough space */
203 break;
204 245
205 /* some kernels overwrite fm_length, so just reset everything */ 246 }
206 fiemap->fm_start = req->offs;
207 fiemap->fm_length = req->size;
208 fiemap->fm_flags = req->int2;
209 fiemap->fm_extent_count = 0;
210
211 if (ioctl (req->int1, FS_IOC_FIEMAP, fiemap))
212 return;
213
214 /* to work around a kernel bug, we allocate one more */
215 count = fiemap->fm_mapped_extents + 1;
216
217 free (fiemap);
218 } 247 }
219 248
249done:
220 req->result = 0; 250 req->result = 0;
221 251
222#else 252#else
223 errno = ENOSYS; 253 errno = ENOSYS;
224#endif 254#endif
… …
1101 aio_fsync = EIO_FSYNC 1131 aio_fsync = EIO_FSYNC
1102 aio_fdatasync = EIO_FDATASYNC 1132 aio_fdatasync = EIO_FDATASYNC
1103 aio_syncfs = EIO_SYNCFS 1133 aio_syncfs = EIO_SYNCFS
1104 PPCODE: 1134 PPCODE:
1105{ 1135{
1106 int fd = s_fileno_croak (fh, 0); 1136 int fd = s_fileno_croak (fh, 0);
1107 dREQ; 1137 dREQ;
1108 1138
1109 req->type = ix; 1139 req->type = ix;
1110 req->sv1 = newSVsv (fh); 1140 req->sv1 = newSVsv (fh);
1111 req->int1 = fd; 1141 req->int1 = fd;
… …
1115 1145
1116void 1146void
1117aio_sync_file_range (SV *fh, off_t offset, size_t nbytes, UV flags, SV *callback=&PL_sv_undef) 1147aio_sync_file_range (SV *fh, off_t offset, size_t nbytes, UV flags, SV *callback=&PL_sv_undef)
1118 PPCODE: 1148 PPCODE:
1119{ 1149{
1120 int fd = s_fileno_croak (fh, 0); 1150 int fd = s_fileno_croak (fh, 0);
1121 dREQ; 1151 dREQ;
1122 1152
1123 req->type = EIO_SYNC_FILE_RANGE; 1153 req->type = EIO_SYNC_FILE_RANGE;
1124 req->sv1 = newSVsv (fh); 1154 req->sv1 = newSVsv (fh);
1125 req->int1 = fd; 1155 req->int1 = fd;
… …
1132 1162
1133void 1163void
1134aio_fallocate (SV *fh, int mode, off_t offset, size_t len, SV *callback=&PL_sv_undef) 1164aio_fallocate (SV *fh, int mode, off_t offset, size_t len, SV *callback=&PL_sv_undef)
1135 PPCODE: 1165 PPCODE:
1136{ 1166{
1137 int fd = s_fileno_croak (fh, 0); 1167 int fd = s_fileno_croak (fh, 0);
1138 dREQ; 1168 dREQ;
1139 1169
1140 req->type = EIO_FALLOCATE; 1170 req->type = EIO_FALLOCATE;
1141 req->sv1 = newSVsv (fh); 1171 req->sv1 = newSVsv (fh);
1142 req->int1 = fd; 1172 req->int1 = fd;
… …
1150void 1180void
1151aio_close (SV *fh, SV *callback=&PL_sv_undef) 1181aio_close (SV *fh, SV *callback=&PL_sv_undef)
1152 PPCODE: 1182 PPCODE:
1153{ 1183{
1154 static int close_fd = -1; /* dummy fd to close fds via dup2 */ 1184 static int close_fd = -1; /* dummy fd to close fds via dup2 */
1155 int fd = s_fileno_croak (fh, 0); 1185 int fd = s_fileno_croak (fh, 0);
1156 dREQ; 1186 dREQ;
1157 1187
1158 if (expect_false (close_fd < 0)) 1188 if (expect_false (close_fd < 0))
1159 { 1189 {
1160 int pipefd [2]; 1190 int pipefd [2];
… …
1270 1300
1271void 1301void
1272aio_sendfile (SV *out_fh, SV *in_fh, off_t in_offset, size_t length, SV *callback=&PL_sv_undef) 1302aio_sendfile (SV *out_fh, SV *in_fh, off_t in_offset, size_t length, SV *callback=&PL_sv_undef)
1273 PPCODE: 1303 PPCODE:
1274{ 1304{
1275 int ifd = s_fileno_croak (in_fh , 0); 1305 int ifd = s_fileno_croak (in_fh , 0);
1276 int ofd = s_fileno_croak (out_fh, 1); 1306 int ofd = s_fileno_croak (out_fh, 1);
1277 dREQ; 1307 dREQ;
1278 1308
1279 req->type = EIO_SENDFILE; 1309 req->type = EIO_SENDFILE;
1280 req->sv1 = newSVsv (out_fh); 1310 req->sv1 = newSVsv (out_fh);
1281 req->int1 = ofd; 1311 req->int1 = ofd;
… …
1289 1319
1290void 1320void
1291aio_readahead (SV *fh, off_t offset, size_t length, SV *callback=&PL_sv_undef) 1321aio_readahead (SV *fh, off_t offset, size_t length, SV *callback=&PL_sv_undef)
1292 PPCODE: 1322 PPCODE:
1293{ 1323{
1294 int fd = s_fileno_croak (fh, 0); 1324 int fd = s_fileno_croak (fh, 0);
1295 dREQ; 1325 dREQ;
1296 1326
1297 req->type = EIO_READAHEAD; 1327 req->type = EIO_READAHEAD;
1298 req->sv1 = newSVsv (fh); 1328 req->sv1 = newSVsv (fh);
1299 req->int1 = fd; 1329 req->int1 = fd;
… …
1769int 1799int
1770munlock (SV *scalar, off_t offset = 0, SV *length = &PL_sv_undef) 1800munlock (SV *scalar, off_t offset = 0, SV *length = &PL_sv_undef)
1771 CODE: 1801 CODE:
1772{ 1802{
1773 STRLEN svlen; 1803 STRLEN svlen;
1774 void *addr = SvPVbyte (scalar, svlen); 1804 void *addr = SvPVbyte (scalar, svlen);
1775 size_t len = SvUV (length); 1805 size_t len = SvUV (length);
1776 1806
1777 if (offset < 0) 1807 if (offset < 0)
1778 offset += svlen; 1808 offset += svlen;
1779 1809

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