The lli_lsm_sem locks taken by ll_prep_md_op_data() are sometimes
released by a different thread. This confuses lockdep unless we
explain the situation.
So use down_read_non_owner() and up_read_non_owner().
Test-Parameters: trivial
Signed-off-by: Mr NeilBrown <neilb@suse.de>
Change-Id: Ie6543706c658fc427461ef03448f3fcf90abaab7
Reviewed-on: https://review.whamcloud.com/39234
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
void ll_unlock_md_op_lsm(struct md_op_data *op_data)
{
if (op_data->op_mea2_sem) {
void ll_unlock_md_op_lsm(struct md_op_data *op_data)
{
if (op_data->op_mea2_sem) {
- up_read(op_data->op_mea2_sem);
+ up_read_non_owner(op_data->op_mea2_sem);
op_data->op_mea2_sem = NULL;
}
if (op_data->op_mea1_sem) {
op_data->op_mea2_sem = NULL;
}
if (op_data->op_mea1_sem) {
- up_read(op_data->op_mea1_sem);
+ up_read_non_owner(op_data->op_mea1_sem);
op_data->op_mea1_sem = NULL;
}
}
op_data->op_mea1_sem = NULL;
}
}
op_data->op_code = opc;
if (S_ISDIR(i1->i_mode)) {
op_data->op_code = opc;
if (S_ISDIR(i1->i_mode)) {
- down_read(&ll_i2info(i1)->lli_lsm_sem);
+ down_read_non_owner(&ll_i2info(i1)->lli_lsm_sem);
op_data->op_mea1_sem = &ll_i2info(i1)->lli_lsm_sem;
op_data->op_mea1 = ll_i2info(i1)->lli_lsm_md;
op_data->op_default_mea1 = ll_i2info(i1)->lli_default_lsm_md;
op_data->op_mea1_sem = &ll_i2info(i1)->lli_lsm_sem;
op_data->op_mea1 = ll_i2info(i1)->lli_lsm_md;
op_data->op_default_mea1 = ll_i2info(i1)->lli_default_lsm_md;
op_data->op_fid2 = *ll_inode2fid(i2);
if (S_ISDIR(i2->i_mode)) {
if (i2 != i1) {
op_data->op_fid2 = *ll_inode2fid(i2);
if (S_ISDIR(i2->i_mode)) {
if (i2 != i1) {
- down_read(&ll_i2info(i2)->lli_lsm_sem);
+ /* i2 is typically a child of i1, and MUST be
+ * further from the root to avoid deadlocks.
+ */
+ down_read_non_owner(&ll_i2info(i2)->lli_lsm_sem);
op_data->op_mea2_sem =
&ll_i2info(i2)->lli_lsm_sem;
}
op_data->op_mea2_sem =
&ll_i2info(i2)->lli_lsm_sem;
}