… | |
… | |
1292 | C<IO::AIO::FIEMAP_FLAG_XATTR> - C<IO::AIO::FIEMAP_FLAGS_COMPAT> is also |
1292 | C<IO::AIO::FIEMAP_FLAG_XATTR> - C<IO::AIO::FIEMAP_FLAGS_COMPAT> is also |
1293 | exported), and is normally C<0> or C<IO::AIO::FIEMAP_FLAG_SYNC> to query |
1293 | exported), and is normally C<0> or C<IO::AIO::FIEMAP_FLAG_SYNC> to query |
1294 | the data portion. |
1294 | the data portion. |
1295 | |
1295 | |
1296 | C<$count> is the maximum number of extent records to return. If it is |
1296 | C<$count> is the maximum number of extent records to return. If it is |
1297 | C<undef>, then IO::AIO queries all extents of the file. As a very special |
1297 | C<undef>, then IO::AIO queries all extents of the range. As a very special |
1298 | case, if it is C<0>, then the callback receives the number of extents |
1298 | case, if it is C<0>, then the callback receives the number of extents |
1299 | instead of the extents themselves. |
1299 | instead of the extents themselves (which is unreliable, see below). |
1300 | |
1300 | |
1301 | If an error occurs, the callback receives no arguments. The special |
1301 | If an error occurs, the callback receives no arguments. The special |
1302 | C<errno> value C<IO::AIO::EBADR> is available to test for flag errors. |
1302 | C<errno> value C<IO::AIO::EBADR> is available to test for flag errors. |
1303 | |
1303 | |
1304 | Otherwise, the callback receives an array reference with extent |
1304 | Otherwise, the callback receives an array reference with extent |
… | |
… | |
1314 | C<IO::AIO::FIEMAP_EXTENT_DELALLOC>, C<IO::AIO::FIEMAP_EXTENT_ENCODED>, |
1314 | C<IO::AIO::FIEMAP_EXTENT_DELALLOC>, C<IO::AIO::FIEMAP_EXTENT_ENCODED>, |
1315 | C<IO::AIO::FIEMAP_EXTENT_DATA_ENCRYPTED>, C<IO::AIO::FIEMAP_EXTENT_NOT_ALIGNED>, |
1315 | C<IO::AIO::FIEMAP_EXTENT_DATA_ENCRYPTED>, C<IO::AIO::FIEMAP_EXTENT_NOT_ALIGNED>, |
1316 | C<IO::AIO::FIEMAP_EXTENT_DATA_INLINE>, C<IO::AIO::FIEMAP_EXTENT_DATA_TAIL>, |
1316 | C<IO::AIO::FIEMAP_EXTENT_DATA_INLINE>, C<IO::AIO::FIEMAP_EXTENT_DATA_TAIL>, |
1317 | C<IO::AIO::FIEMAP_EXTENT_UNWRITTEN>, C<IO::AIO::FIEMAP_EXTENT_MERGED> or |
1317 | C<IO::AIO::FIEMAP_EXTENT_UNWRITTEN>, C<IO::AIO::FIEMAP_EXTENT_MERGED> or |
1318 | C<IO::AIO::FIEMAP_EXTENT_SHARED>. |
1318 | C<IO::AIO::FIEMAP_EXTENT_SHARED>. |
|
|
1319 | |
|
|
1320 | At the time of this writing (Linux 3.2), this requets is unreliable unless |
|
|
1321 | C<$count> is C<undef>, as the kernel has all sorts of bugs preventing |
|
|
1322 | it to return all extents of a range for files with large number of |
|
|
1323 | extents. The code works around all these issues if C<$count> is undef. |
1319 | |
1324 | |
1320 | =item aio_group $callback->(...) |
1325 | =item aio_group $callback->(...) |
1321 | |
1326 | |
1322 | This is a very special aio request: Instead of doing something, it is a |
1327 | This is a very special aio request: Instead of doing something, it is a |
1323 | container for other aio requests, which is useful if you want to bundle |
1328 | container for other aio requests, which is useful if you want to bundle |