| … | |
… | |
| 1249 | |
1249 | |
| 1250 | Example: asynchronously lock all current and future pages into memory. |
1250 | Example: asynchronously lock all current and future pages into memory. |
| 1251 | |
1251 | |
| 1252 | aio_mlockall IO::AIO::MCL_FUTURE; |
1252 | aio_mlockall IO::AIO::MCL_FUTURE; |
| 1253 | |
1253 | |
|
|
1254 | =item aio_fiemap $fh, $start, $length, $flags, $count, $cb->(\@extents) |
|
|
1255 | |
|
|
1256 | Queries the extents of the given file (by calling the Linux FIEMAP ioctl, |
|
|
1257 | see L<http://cvs.schmorp.de/IO-AIO/doc/fiemap.txt> for details). If the |
|
|
1258 | C<ioctl> is not available on your OS, then this rquiest will fail with |
|
|
1259 | C<ENOSYS>. |
|
|
1260 | |
|
|
1261 | C<$start> is the starting offset to query extents for, C<$length> is the |
|
|
1262 | size of the range to query - if it is C<undef>, then the whole file will |
|
|
1263 | be queried. |
|
|
1264 | |
|
|
1265 | C<$flags> is a combination of flags (C<IO::AIO::FIEMAP_FLAG_SYNC> or |
|
|
1266 | C<IO::AIO::FIEMAP_FLAG_XATTR> - C<IO::AIO::FIEMAP_FLAGS_COMPAT> is also |
|
|
1267 | exported), and is normally C<0> or C<IO::AIO::FIEMAP_FLAG_SYNC> to query |
|
|
1268 | the data portion. |
|
|
1269 | |
|
|
1270 | C<$count> is the maximum number of extent records to return. If it is |
|
|
1271 | C<undef>, then IO::AIO queries all extents of the file. As a very special |
|
|
1272 | case, if it is C<0>, then the callback receives the number of extents |
|
|
1273 | instead of the extents themselves. |
|
|
1274 | |
|
|
1275 | If an error occurs, the callback receives no arguments. The special |
|
|
1276 | C<errno> value C<IO::AIO::EBADR> is available to test for flag errors. |
|
|
1277 | |
|
|
1278 | Otherwise, the callback receives an array reference with extent |
|
|
1279 | structures. Each extent structure is an array reference itself, with the |
|
|
1280 | following members: |
|
|
1281 | |
|
|
1282 | [$logical, $physical, $length, $flags] |
|
|
1283 | |
|
|
1284 | Flags is any combination of the following flag values (typically either C<0> |
|
|
1285 | or C<IO::AIO::FIEMAP_EXTENT_LAST>): |
|
|
1286 | |
|
|
1287 | C<IO::AIO::FIEMAP_EXTENT_LAST>, C<IO::AIO::FIEMAP_EXTENT_UNKNOWN>, |
|
|
1288 | C<IO::AIO::FIEMAP_EXTENT_DELALLOC>, C<IO::AIO::FIEMAP_EXTENT_ENCODED>, |
|
|
1289 | C<IO::AIO::FIEMAP_EXTENT_DATA_ENCRYPTED>, C<IO::AIO::FIEMAP_EXTENT_NOT_ALIGNED>, |
|
|
1290 | C<IO::AIO::FIEMAP_EXTENT_DATA_INLINE>, C<IO::AIO::FIEMAP_EXTENT_DATA_TAIL>, |
|
|
1291 | C<IO::AIO::FIEMAP_EXTENT_UNWRITTEN>, C<IO::AIO::FIEMAP_EXTENT_MERGED> or |
|
|
1292 | C<IO::AIO::FIEMAP_EXTENT_SHARED>. |
|
|
1293 | |
| 1254 | =item aio_group $callback->(...) |
1294 | =item aio_group $callback->(...) |
| 1255 | |
1295 | |
| 1256 | This is a very special aio request: Instead of doing something, it is a |
1296 | This is a very special aio request: Instead of doing something, it is a |
| 1257 | container for other aio requests, which is useful if you want to bundle |
1297 | container for other aio requests, which is useful if you want to bundle |
| 1258 | many requests into a single, composite, request with a definite callback |
1298 | many requests into a single, composite, request with a definite callback |
