logfs: survive logfs_buf_recover read errors
Refusing to mount beats a kernel crash.
Signed-off-by: Joern Engel <joern@logfs.org>
diff --git a/fs/logfs/segment.c b/fs/logfs/segment.c
index f77ce2b..a9657af 100644
--- a/fs/logfs/segment.c
+++ b/fs/logfs/segment.c
@@ -67,7 +67,7 @@
return page;
}
-void __logfs_buf_write(struct logfs_area *area, u64 ofs, void *buf, size_t len,
+int __logfs_buf_write(struct logfs_area *area, u64 ofs, void *buf, size_t len,
int use_filler)
{
pgoff_t index = ofs >> PAGE_SHIFT;
@@ -81,8 +81,10 @@
copylen = min((ulong)len, PAGE_SIZE - offset);
page = get_mapping_page(area->a_sb, index, use_filler);
- SetPageUptodate(page);
+ if (IS_ERR(page))
+ return PTR_ERR(page);
BUG_ON(!page); /* FIXME: reserve a pool */
+ SetPageUptodate(page);
memcpy(page_address(page) + offset, buf, copylen);
SetPagePrivate(page);
page_cache_release(page);
@@ -92,6 +94,7 @@
offset = 0;
index++;
} while (len);
+ return 0;
}
static void pad_partial_page(struct logfs_area *area)