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-rw-r--r--fs/btrfs/inode.c57
1 files changed, 51 insertions, 6 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index d8bb0db..a7d1921 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -3754,7 +3754,7 @@ void btrfs_evict_inode(struct inode *inode)
btrfs_wait_ordered_range(inode, 0, (u64)-1);
if (root->fs_info->log_root_recovering) {
- BUG_ON(!test_bit(BTRFS_INODE_HAS_ORPHAN_ITEM,
+ BUG_ON(test_bit(BTRFS_INODE_HAS_ORPHAN_ITEM,
&BTRFS_I(inode)->runtime_flags));
goto no_delete;
}
@@ -5876,8 +5876,17 @@ map:
bh_result->b_size = len;
bh_result->b_bdev = em->bdev;
set_buffer_mapped(bh_result);
- if (create && !test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
- set_buffer_new(bh_result);
+ if (create) {
+ if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
+ set_buffer_new(bh_result);
+
+ /*
+ * Need to update the i_size under the extent lock so buffered
+ * readers will get the updated i_size when we unlock.
+ */
+ if (start + len > i_size_read(inode))
+ i_size_write(inode, start + len);
+ }
free_extent_map(em);
@@ -6360,12 +6369,48 @@ static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb,
*/
ordered = btrfs_lookup_ordered_range(inode, lockstart,
lockend - lockstart + 1);
- if (!ordered)
+
+ /*
+ * We need to make sure there are no buffered pages in this
+ * range either, we could have raced between the invalidate in
+ * generic_file_direct_write and locking the extent. The
+ * invalidate needs to happen so that reads after a write do not
+ * get stale data.
+ */
+ if (!ordered && (!writing ||
+ !test_range_bit(&BTRFS_I(inode)->io_tree,
+ lockstart, lockend, EXTENT_UPTODATE, 0,
+ cached_state)))
break;
+
unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend,
&cached_state, GFP_NOFS);
- btrfs_start_ordered_extent(inode, ordered, 1);
- btrfs_put_ordered_extent(ordered);
+
+ if (ordered) {
+ btrfs_start_ordered_extent(inode, ordered, 1);
+ btrfs_put_ordered_extent(ordered);
+ } else {
+ /* Screw you mmap */
+ ret = filemap_write_and_wait_range(file->f_mapping,
+ lockstart,
+ lockend);
+ if (ret)
+ goto out;
+
+ /*
+ * If we found a page that couldn't be invalidated just
+ * fall back to buffered.
+ */
+ ret = invalidate_inode_pages2_range(file->f_mapping,
+ lockstart >> PAGE_CACHE_SHIFT,
+ lockend >> PAGE_CACHE_SHIFT);
+ if (ret) {
+ if (ret == -EBUSY)
+ ret = 0;
+ goto out;
+ }
+ }
+
cond_resched();
}
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