diff options
Diffstat (limited to 'lib/metadata/pv_manip.c')
| -rw-r--r-- | lib/metadata/pv_manip.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/lib/metadata/pv_manip.c b/lib/metadata/pv_manip.c index fdba91dd..8a06a722 100644 --- a/lib/metadata/pv_manip.c +++ b/lib/metadata/pv_manip.c @@ -20,6 +20,7 @@ #include "archiver.h" #include "locking.h" #include "lvmcache.h" +#include "defaults.h" static struct pv_segment *_alloc_pv_segment(struct dm_pool *mem, struct physical_volume *pv, @@ -190,12 +191,38 @@ struct pv_segment *assign_peg_to_lvseg(struct physical_volume *pv, int release_pv_segment(struct pv_segment *peg, uint32_t area_reduction) { + uint64_t discard_offset; + uint64_t pe_start = peg->pv->pe_start; + uint64_t discard_area_reduction = area_reduction; + if (!peg->lvseg) { log_error("release_pv_segment with unallocated segment: " "%s PE %" PRIu32, pv_dev_name(peg->pv), peg->pe); return 0; } + /* + * Only issue discards if enabled in lvm.conf and both + * the device and kernel (>= 2.6.35) supports discards. + */ + if (find_config_tree_bool(peg->pv->fmt->cmd, + "devices/issue_discards", DEFAULT_ISSUE_DISCARDS) && + dev_discard_max_bytes(peg->pv->fmt->cmd->sysfs_dir, peg->pv->dev) && + dev_discard_granularity(peg->pv->fmt->cmd->sysfs_dir, peg->pv->dev)) { + if (!pe_start) { + /* skip the first extent */ + pe_start = peg->pv->vg->extent_size; + discard_area_reduction--; + } + discard_offset = peg->pe + peg->lvseg->area_len - area_reduction; + discard_offset = (discard_offset * peg->pv->vg->extent_size) + pe_start; + log_debug("Discarding %" PRIu32 " extents offset %" PRIu64 " sectors on %s.", + discard_area_reduction, discard_offset, dev_name(peg->pv->dev)); + if (!dev_discard_blocks(peg->pv->dev, discard_offset << SECTOR_SHIFT, + discard_area_reduction * peg->pv->vg->extent_size * SECTOR_SIZE)) + return_0; + } + if (peg->lvseg->area_len == area_reduction) { peg->pv->pe_alloc_count -= area_reduction; peg->lvseg->lv->vg->free_count += area_reduction; |