diff options
Diffstat (limited to 'shlibs/blkid/src/partitions/partitions.c')
| -rw-r--r-- | shlibs/blkid/src/partitions/partitions.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/shlibs/blkid/src/partitions/partitions.c b/shlibs/blkid/src/partitions/partitions.c index 293ee86aa..9d8f3db7a 100644 --- a/shlibs/blkid/src/partitions/partitions.c +++ b/shlibs/blkid/src/partitions/partitions.c @@ -582,6 +582,9 @@ static int partitions_probe(blkid_probe pr, struct blkid_chain *chn) if (chn->binary) partitions_init_data(pr, chn); + if (pr->prob_flags & BLKID_PARTS_IGNORE_PT) + goto details_only; + DBG(DEBUG_LOWPROBE, printf("--> starting probing loop [PARTS idx=%d]\n", chn->idx)); @@ -620,6 +623,7 @@ static int partitions_probe(blkid_probe pr, struct blkid_chain *chn) chn->idx)); } +details_only: /* * Gather PART_ENTRY_* values if the current device is a partition. */ @@ -764,6 +768,82 @@ nothing: return rc; } +/* + * This function is compatible with blkid_probe_get_partitions(), but the + * result is not stored in @pr and all probing is independent on the + * status of @pr. It's possible to call this function from arbitrary + * place without a care about @pr. + */ +static blkid_partlist blkid_probe_get_independent_partlist(blkid_probe pr) +{ + + blkid_partlist ls = NULL, org_ls = NULL; + struct blkid_chain *chn = &pr->chains[BLKID_CHAIN_PARTS]; + struct blkid_prval vals[BLKID_NVALS_PARTS]; + int nvals = BLKID_NVALS_PARTS; + int idx; + + /* save old results */ + nvals = blkid_probe_chain_copy_vals(pr, chn, vals, nvals); + idx = chn->idx; + if (chn->data) { + org_ls = chn->data; + chn->data = NULL; + } + + ls = blkid_probe_get_partitions(pr); + + /* restore original results */ + chn->data = org_ls; + chn->idx = idx; + + blkid_probe_chain_reset_vals(pr, chn); + blkid_probe_append_vals(pr, vals, nvals); + + return ls; +} + +/* + * Returns 1 if the device is whole-disk and the area specified by @offset and + * @size is covered by any partition. + */ +int blkid_probe_is_covered_by_pt(blkid_probe pr, + blkid_loff_t offset, blkid_loff_t size) +{ + blkid_partlist ls = NULL; + blkid_loff_t start, end; + int nparts, i, rc = 0; + + DBG(DEBUG_LOWPROBE, printf( + "=> checking if off=%jd size=%jd covered by PT\n", + offset, size)); + + ls = blkid_probe_get_independent_partlist(pr); + if (!ls) + goto done; + + nparts = blkid_partlist_numof_partitions(ls); + if (!nparts) + goto done; + + end = (offset + size) >> 9; + start = offset >> 9; + + for (i = 0; i < nparts; i++) { + blkid_partition par = &ls->parts[i]; + + if (start >= par->start && end <= par->start + par->size) { + rc = 1; + break; + } + } +done: + partitions_free_data(pr, (void *)ls); + + DBG(DEBUG_LOWPROBE, printf("<= %s covered by PT\n", rc ? "IS" : "NOT")); + return rc; +} + /** * blkid_known_pttype: * @pttype: partiton name |