From: Theodore Ts'o Date: Fri, 1 Jun 2012 03:46:01 +0000 (-0400) Subject: ext4: don't trash state flags in EXT4_IOC_SETFLAGS X-Git-Tag: firefly_0821_release~3680^2~2694^2~4 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=79906964a187c405db72a3abc60eb9b50d804fbc;p=firefly-linux-kernel-4.4.55.git ext4: don't trash state flags in EXT4_IOC_SETFLAGS 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 Signed-off-by: "Theodore Ts'o" Cc: stable@kernel.org --- diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c index feba55a225a6..8ad112ae0ade 100644 --- a/fs/ext4/ioctl.c +++ b/fs/ext4/ioctl.c @@ -38,7 +38,7 @@ 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)) @@ -115,8 +115,14 @@ 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);