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ext4: prevent a fs with errors from being resized 

A filesystem with errors is not allowed to being resized, otherwise,
it is easy to destroy the filesystem.

Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Yongqiang Yang 2011-07-26 21:39:09 -04:00 committed by Theodore Ts'o
parent 8f82f840ec
commit ce723c31b5
1 changed files with 10 additions and 0 deletions
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10
fs/ext4/resize.c
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@ -23,6 +23,16 @@ int ext4_resize_begin(struct super_block *sb)
if (!capable(CAP_SYS_RESOURCE)) if (!capable(CAP_SYS_RESOURCE))
return -EPERM; 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)) if (test_and_set_bit_lock(EXT4_RESIZING, &EXT4_SB(sb)->s_resize_flags))
ret = -EBUSY; ret = -EBUSY;