On 07/11/2011 07:40 AM, Jeremy Sanders wrote:
> Jeremy Sanders wrote:
>
>> Hi - I'm trying btrfs with kernel 2.6.38.8-32.fc15.x86_64 (a Fedora
>> kernel). I'm just doing a tar-to-tar copy onto the file system with
>> compress- force=zlib. Here are some traces of the stuck processes.
>
> I've managed to reproduce the hang using the latest btrfs from the
> repository. I had to remove some of the tracing lines to get it to compile
> under 2.6.38.8 and an ioctl which wasn't defined. Here is is where it is
> stuck:
>
Hrm well that is just unlikely and hard to hit. Will you try this and
see if it helps you? Thanks,
Josef
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 59cbdb1..3c8c435 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1081,7 +1081,8 @@ static noinline int prepare_pages(struct
btrfs_root *root, struct file *file,
again:
for (i = 0; i < num_pages; i++) {
- pages[i] = grab_cache_page(inode->i_mapping, index + i);
+ pages[i] = find_or_create_page(inode->i_mapping, index + i,
+ GFP_NOFS);
if (!pages[i]) {
faili = i - 1;
err = -ENOMEM;
--
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