[PATCH 02/12] ext4: prevent a fs with errors from being resized
From: Yongqiang Yang <hidden>
Date: 2011-07-18 02:56:48
Subsystem:
ext4 file system, filesystems (vfs and infrastructure), the rest · Maintainers:
"Theodore Ts'o", Alexander Viro, Christian Brauner, Linus Torvalds
A filesystem with errors is not allowed to being resized, otherwise, it is easy to destroy the filesystem. Signed-off-by: Yongqiang Yang <redacted> --- fs/ext4/resize.c | 10 ++++++++++ 1 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index 0213f63..53d9795 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c@@ -23,6 +23,16 @@ int ext4_resize_begin(struct super_block *sb) if (!capable(CAP_SYS_RESOURCE)) return -EPERM; + /* + * We are not allowed to do online-resizing on a filesystem mounted + * with error, because it can destroy the filesystem easily. + */ + if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { + ext4_warning(sb, "There are errors in the filesystem, " + "so online resizing is not allowed\n"); + return -EPERM; + } + if (test_and_set_bit_lock(EXT4_RESIZING, &EXT4_SB(sb)->s_resize_flags)) ret = -EBUSY;
--
1.7.5.1