On 14.01.25 6:03, Pavel Tikhomirov wrote:
On 12/6/24 05:55, Alexander Atanasov wrote:
@@ -411,7 +415,6 @@ static void ploop_apply_delta_mappings(struct
ploop *ploop,
if (!is_raw)
d_md = ploop_md_first_entry(md_root);
- write_lock_irq(&ploop->bat_rwlock);
ploop_for_each_md_page(ploop, md, node) {
bat_entries = md->kmpage;
if (!is_raw)
@@ -455,7 +458,6 @@ static void ploop_apply_delta_mappings(struct
ploop *ploop,
if (!is_raw)
d_md = ploop_md_next_entry(d_md);
}
- write_unlock_irq(&ploop->bat_rwlock);
}
int ploop_check_delta_length(struct ploop *ploop, struct file *file,
loff_t *file_size)
This is not possible to remove this lock, as ploop->bat_entries rbtree
is protected by it. In other words ploop_for_each_md_page should be
protected by critical section against concurrent ploop_add_md_pages.
No, it is possible.
- ploop_apply_delta_mappings is only used before the device is started -
not possible to have concurent calls.
- ploop_add_md_pages in case of resize works on a different rbtree.
--
Regards,
Alexander Atanasov
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