| … | |
… | |
| 167 | req->result = -1; |
167 | req->result = -1; |
| 168 | |
168 | |
| 169 | #if HAVE_FIEMAP |
169 | #if HAVE_FIEMAP |
| 170 | int count = req->int3; |
170 | int count = req->int3; |
| 171 | |
171 | |
| 172 | /* heuristic: first try with 64 extents if we don't know how many, */ |
172 | /* heuristic: first try with 72 extents if we don't know how many, */ |
| 173 | /* as most files have (hopefully) fewer than this many extents */ |
173 | /* as most files have (hopefully) fewer than this many extents */ |
| 174 | /* in fact, most should have <= 2, so maybe the 72 below is probably overkill */ |
174 | /* in fact, most should have <= 2, so the 72 below is probably overkill */ |
| 175 | if (count < 0) |
175 | if (count < 0) |
| 176 | count = 72; /* for what it's worth, 72 extents fit nicely into 4kb */ |
176 | count = 72; /* for what it's worth, 72 extents fit nicely into 4kb */ |
| 177 | |
177 | |
| 178 | for (;;) |
178 | for (;;) |
| 179 | { |
179 | { |
| … | |
… | |
| 194 | return; |
194 | return; |
| 195 | |
195 | |
| 196 | if (req->int3 >= 0) |
196 | if (req->int3 >= 0) |
| 197 | break; /* when not autosizing we are done */ |
197 | break; /* when not autosizing we are done */ |
| 198 | |
198 | |
| 199 | if (fiemap->fm_extents [fiemap->fm_mapped_extents - 1].fe_flags & FIEMAP_EXTENT_LAST) |
199 | if (fiemap->fm_mapped_extents < count) |
| 200 | break; /* autosizing successful, we are done */ |
200 | /* either autosizing succeeded, |
|
|
201 | * or the file had no extents |
|
|
202 | * or we luckily had enough space */ |
|
|
203 | break; |
| 201 | |
204 | |
|
|
205 | /* some kernels overwrite fm_length, so just reset everything */ |
|
|
206 | fiemap->fm_start = req->offs; |
|
|
207 | fiemap->fm_length = req->size; |
| 202 | fiemap->fm_flags = req->int2; |
208 | fiemap->fm_flags = req->int2; |
| 203 | fiemap->fm_extent_count = 0; |
209 | fiemap->fm_extent_count = 0; |
| 204 | |
210 | |
| 205 | if (ioctl (req->int1, FS_IOC_FIEMAP, fiemap)) |
211 | if (ioctl (req->int1, FS_IOC_FIEMAP, fiemap)) |
| 206 | return; |
212 | return; |
| 207 | |
213 | |
|
|
214 | /* to work around a kernel bug, we allocate one more */ |
| 208 | count = fiemap->fm_mapped_extents; |
215 | count = fiemap->fm_mapped_extents + 1; |
| 209 | |
216 | |
| 210 | free (fiemap); |
217 | free (fiemap); |
| 211 | } |
218 | } |
| 212 | |
219 | |
| 213 | req->result = 0; |
220 | req->result = 0; |
| … | |
… | |
| 1532 | |
1539 | |
| 1533 | void |
1540 | void |
| 1534 | aio_fiemap (SV *fh, off_t start, SV *length, U32 flags, SV *count, SV *callback=&PL_sv_undef) |
1541 | aio_fiemap (SV *fh, off_t start, SV *length, U32 flags, SV *count, SV *callback=&PL_sv_undef) |
| 1535 | PPCODE: |
1542 | PPCODE: |
| 1536 | { |
1543 | { |
| 1537 | int fd = s_fileno_croak (fh, 0); |
1544 | int fd = s_fileno_croak (fh, 0); |
| 1538 | dREQ; |
1545 | dREQ; |
| 1539 | |
1546 | |
| 1540 | req->type = EIO_CUSTOM; |
1547 | req->type = EIO_CUSTOM; |
| 1541 | req->sv1 = newSVsv (fh); |
1548 | req->sv1 = newSVsv (fh); |
| 1542 | req->int1 = fd; |
1549 | req->int1 = fd; |
