[ It's weird that kbuild didn't catch this ].
Hello Vyacheslav Dubeyko,
The patch bb594c4767b0: "nilfs2: fix issue with flush kernel thread
after remount in RO mode because of driver's internal error or
metadata corruption" from Apr 18, 2013, leads to the following
warning:
"fs/nilfs2/inode.c:211 nilfs_writepage()
error: we previously assumed 'inode' could be null (see line 195)"
fs/nilfs2/inode.c
190 static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
191 {
192 struct inode *inode = page->mapping->host;
193 int err;
194
195 if (inode && (inode->i_sb->s_flags & MS_RDONLY)) {
^^^^^
New check.
196 /*
197 * It means that filesystem was remounted in read-only
198 * mode because of error or metadata corruption. But we
199 * have dirty pages that try to be flushed in background.
200 * So, here we simply discard this dirty page.
201 */
202 nilfs_clear_dirty_page(page, false);
203 unlock_page(page);
204 return -EROFS;
205 }
206
207 redirty_page_for_writepage(wbc, page);
208 unlock_page(page);
209
210 if (wbc->sync_mode == WB_SYNC_ALL) {
211 err = nilfs_construct_segment(inode->i_sb);
^^^^^^^^^^^
Old dereference.
212 if (unlikely(err))
213 return err;
214 } else if (wbc->for_reclaim)
215 nilfs_flush_segment(inode->i_sb, inode->i_ino);
^^^^^^^^^^^
Old dereference.
216
217 return 0;
218 }
regards,
dan carpenter
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