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| author | Theodore Ts'o <tytso@mit.edu> | 2012-05-31 23:46:01 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2012-05-31 23:46:01 -0400 |
| commit | 79906964a187c405db72a3abc60eb9b50d804fbc (patch) | |
| tree | bb9cec1905d268cda5d46a95b993e0a173c226c4 /fs/ext4/ioctl.c | |
| parent | 9660755100ae7677d65772a28e16d475a2ee9eab (diff) | |
| download | linux-79906964a187c405db72a3abc60eb9b50d804fbc.tar.gz linux-79906964a187c405db72a3abc60eb9b50d804fbc.tar.bz2 linux-79906964a187c405db72a3abc60eb9b50d804fbc.zip | |
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 <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org
Diffstat (limited to 'fs/ext4/ioctl.c')
| -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 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); |