WARN_ON_ONCE(IS_RDONLY(inode)) tends to trip when filesystem hits error and is remounted read-only. This unnecessarily scares users (well, they should be scared because of filesystem error, but the stack trace distracts them from the right source of their fear ;-). We could as well just remove the WARN_ON but it's not hard to fix it to not trip on filesystem with errors and not use more cycles in the common case so that's what we do. Signed-off-by: Jan Kara <jack@xxxxxxx> --- fs/ext3/inode.c | 18 +++++++++++++++--- 1 files changed, 15 insertions(+), 3 deletions(-) I carry this patch in my tree and will merge it with Linus in the next merge window if noone objects. diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c index a8d3217..91ac85b 100644 --- a/fs/ext3/inode.c +++ b/fs/ext3/inode.c @@ -1623,7 +1623,11 @@ static int ext3_ordered_writepage(struct page *page, int err; J_ASSERT(PageLocked(page)); - WARN_ON_ONCE(IS_RDONLY(inode)); + /* + * We don't want to warn for emergency remount. The condition is ordered to avoid + * dereferencing inode->i_sb in non-error case to avoid slow-downs. + */ + WARN_ON_ONCE(IS_RDONLY(inode) && !(EXT3_SB(inode->i_sb)->s_mount_state & EXT3_ERROR_FS)); /* * We give up here if we're reentered, because it might be for a @@ -1698,7 +1702,11 @@ static int ext3_writeback_writepage(struct page *page, int err; J_ASSERT(PageLocked(page)); - WARN_ON_ONCE(IS_RDONLY(inode)); + /* + * We don't want to warn for emergency remount. The condition is ordered to avoid + * dereferencing inode->i_sb in non-error case to avoid slow-downs. + */ + WARN_ON_ONCE(IS_RDONLY(inode) && !(EXT3_SB(inode->i_sb)->s_mount_state & EXT3_ERROR_FS)); if (ext3_journal_current_handle()) goto out_fail; @@ -1741,7 +1749,11 @@ static int ext3_journalled_writepage(struct page *page, int err; J_ASSERT(PageLocked(page)); - WARN_ON_ONCE(IS_RDONLY(inode)); + /* + * We don't want to warn for emergency remount. The condition is ordered to avoid + * dereferencing inode->i_sb in non-error case to avoid slow-downs. + */ + WARN_ON_ONCE(IS_RDONLY(inode) && !(EXT3_SB(inode->i_sb)->s_mount_state & EXT3_ERROR_FS)); if (ext3_journal_current_handle()) goto no_write; -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
