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libdm: ensure first extent is always counted

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If FIEMAP returns a single extent after the first call, no extent
boundary is detected and the first extent is not counted by the
normal mechanism.

In this case, increment nr_extents at the same time the extent is
added to the region table, before returning.
This commit is contained in:
Bryn M. Reeves 2016-12-13 21:36:11 +00:00
parent fce7449d73
commit f4401fe351
1 changed files with 3 additions and 1 deletions
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4
libdm/libdm-stats.c
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@ -4286,8 +4286,10 @@ static uint64_t _stats_map_extents(struct dm_pool *mem,
* If the file only has a single extent, no boundary is ever * If the file only has a single extent, no boundary is ever
* detected to trigger addition of the first extent. * detected to trigger addition of the first extent.
*/ */
if (fm_ext[i - 1].fe_logical == 0) if (fm_ext[i - 1].fe_logical == 0) {
_stats_add_extent(mem, fm_pending, nr_extents); _stats_add_extent(mem, fm_pending, nr_extents);
nr_extents++;
}
fiemap->fm_start = (fm_ext[i - 1].fe_logical + fiemap->fm_start = (fm_ext[i - 1].fe_logical +
fm_ext[i - 1].fe_length); fm_ext[i - 1].fe_length);