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btrfs: make find_workspace warn if there are no workspaces 

Be verbose if there are no workspaces at all, ie. the module init time
preallocation failed.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2016-04-27 03:07:39 +02:00
parent e721e49dd1
commit 523567168d
1 changed files with 14 additions and 0 deletions
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14
fs/btrfs/compression.c
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@ -834,7 +834,21 @@ again:
* 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;