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Btrfs: handle no memory properly in prepare_pages 

Instead of doing a BUG_ON(1) in prepare_pages if grab_cache_page() fails, just
loop through the pages we've already grabbed and unlock and release them, then
return -ENOMEM like we should.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Josef Bacik 2011-01-25 22:11:54 +00:00 committed by Chris Mason
parent ad0397a7a9
commit 7adf5dfbb3
1 changed files with 6 additions and 2 deletions
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8
fs/btrfs/file.c
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@ -792,8 +792,12 @@ again:
for (i = 0; i < num_pages; i++) {
pages[i] = grab_cache_page(inode->i_mapping, index + i);
if (!pages[i]) {
err = -ENOMEM;
BUG_ON(1);
int c;
for (c = i - 1; c >= 0; c--) {
unlock_page(pages[c]);
page_cache_release(pages[c]);
}
return -ENOMEM;
}
wait_on_page_writeback(pages[i]);
}