I've constructed a test patch that is currently addressing all the
issues on my system.
The portion of Openmotif that was having issues with page faults works
correctly with this patch, and gcc-4.4.5 builds without issue.
I extracted only the portion of the first patch that corrects the
handling of dirty_pages when copied==0, and incorporated the second
patch that falls back to one-page-at-a-time if there are troubles with
page faults.
--- fs/btrfs/file.c 2011-03-05 07:34:43.025131607 -0600
+++ /usr/src/linux/fs/btrfs/file.c 2011-03-05 07:41:45.001260294 -0600
@@ -1023,8 +1023,20 @@
copied = btrfs_copy_from_user(pos, num_pages,
write_bytes, pages, &i);
- dirty_pages = (copied + offset + PAGE_CACHE_SIZE - 1) >>
- PAGE_CACHE_SHIFT;
+
+ /*
+ * if we have trouble faulting in the pages, fall
+ * back to one page at a time
+ */
+ if (copied < write_bytes)
+ nrptrs = 1;
+
+ if (copied == 0)
+ dirty_pages = 0;
+ else
+ dirty_pages = (copied + offset +
+ PAGE_CACHE_SIZE - 1) >>
+ PAGE_CACHE_SHIFT;
if (num_pages > dirty_pages) {
if (copied > 0)
--
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