Be verbose if there are no workspaces at all, ie. the module init time
preallocation failed.
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
---
fs/btrfs/compression.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index c70625560265..658c39b70fba 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -834,7 +834,21 @@ static struct list_head *find_workspace(int type)
* workspace preallocated for each type and the compression
* time is bounded so we get to a workspace eventually. This
* makes our caller's life easier.
+ *
+ * To prevent silent and low-probability deadlocks (when the
+ * initial preallocation fails), check if there are any
+ * workspaces at all.
*/
+ if (atomic_read(total_ws) == 0) {
+ static DEFINE_RATELIMIT_STATE(_rs,
+ /* once per minute */ 60 * HZ,
+ /* no burst */ 1);
+
+ if (__ratelimit(&_rs)) {
+ printk(KERN_WARNING
+ "no compression workspaces, low memory, retrying");
+ }
+ }
goto again;
}
return workspace;
--
2.7.1
--
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