| … | |
… | |
| 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 | { |
| … | |
… | |
| 193 | if (ioctl (req->int1, FS_IOC_FIEMAP, fiemap)) |
193 | if (ioctl (req->int1, FS_IOC_FIEMAP, fiemap)) |
| 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 | |
|
|
199 | if (!fiemap->fm_mapped_extents) |
|
|
200 | break; /* if file has no segments, we are done */ |
| 198 | |
201 | |
| 199 | if (fiemap->fm_extents [fiemap->fm_mapped_extents - 1].fe_flags & FIEMAP_EXTENT_LAST) |
202 | if (fiemap->fm_extents [fiemap->fm_mapped_extents - 1].fe_flags & FIEMAP_EXTENT_LAST) |
| 200 | break; /* autosizing successful, we are done */ |
203 | break; /* autosizing successful, we are done */ |
| 201 | |
204 | |
| 202 | fiemap->fm_flags = req->int2; |
205 | fiemap->fm_flags = req->int2; |
