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Btrfs: Check for NULL page in extent_range_uptodate

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A user has encountered a NULL pointer kernel oops in btrfs when
encountering media errors.  The problem has been identified
as an unhandled NULL pointer returned from find_get_page().
This modification simply checks for a NULL page, and returns
with an error if found (the extent_range_uptodate() function
returns 1 on errors).

After testing this patch, the user reported that the error with
the NULL pointer oops was solved.  However, there is still a
remaining problem with a thread becoming stuck in
wait_on_page_locked(page) in the read_extent_buffer_pages(...)
function in extent_io.c

       for (i = start_i; i < num_pages; i++) {
               page = extent_buffer_page(eb, i);
               wait_on_page_locked(page);
               if (!PageUptodate(page))
                       ret = -EIO;
       }

This patch leaves the issue with the locked page yet to be resolved.

Signed-off-by: Mitch Harder <[email protected]>
Signed-off-by: Chris Mason <[email protected]>
This commit is contained in:
Mitch Harder 2012-01-26 15:01:11 -05:00 • committed by Chris Mason
commit 8bedd51b61
1 changed files with 2 additions and 0 deletions
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2
fs/btrfs/extent_io.c
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@ -3909,6 +3909,8 @@ int extent_range_uptodate(struct extent_io_tree *tree,
while (start <= end) {
index = start >> PAGE_CACHE_SHIFT;
page = find_get_page(tree->mapping, index);
if (!page)
return 1;
uptodate = PageUptodate(page);
page_cache_release(page);
if (!uptodate) {