diff options
| author | Theodore Ts'o <tytso@mit.edu> | 2012-05-31 23:46:01 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-06-10 00:33:04 +0900 |
| commit | eeb7cb57cf619ae9ab8210b21b49820ed40a472f (patch) | |
| tree | aef576ca6a445f87ba08089b2f06774dc6eee200 | |
| parent | 801bdd926b6229da233f6db25770c9e817f98d4e (diff) | |
ext4: don't trash state flags in EXT4_IOC_SETFLAGS
commit 79906964a187c405db72a3abc60eb9b50d804fbc upstream.
In commit 353eb83c we removed i_state_flags with 64-bit longs, But
when handling the EXT4_IOC_SETFLAGS ioctl, we replace i_flags
directly, which trashes the state flags which are stored in the high
32-bits of i_flags on 64-bit platforms. So use the the
ext4_{set,clear}_inode_flags() functions which use atomic bit
manipulation functions instead.
Reported-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/ext4/ioctl.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c index 808c554e773f..892427d8d351 100644 --- a/fs/ext4/ioctl.c +++ b/fs/ext4/ioctl.c @@ -35,7 +35,7 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) handle_t *handle = NULL; int err, migrate = 0; struct ext4_iloc iloc; - unsigned int oldflags; + unsigned int oldflags, mask, i; unsigned int jflag; if (!inode_owner_or_capable(inode)) @@ -112,8 +112,14 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) if (err) goto flags_err; - flags = flags & EXT4_FL_USER_MODIFIABLE; - flags |= oldflags & ~EXT4_FL_USER_MODIFIABLE; + for (i = 0, mask = 1; i < 32; i++, mask <<= 1) { + if (!(mask & EXT4_FL_USER_MODIFIABLE)) + continue; + if (mask & flags) + ext4_set_inode_flag(inode, i); + else + ext4_clear_inode_flag(inode, i); + } ei->i_flags = flags; ext4_set_inode_flags(inode); |