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GFS2 calls permission() to verify permissions after locks on the files
have been taken.
For this it's sufficient to call gfs2_permission() instead. This
results in the following changes:
- IS_RDONLY() check is not performed
- IS_IMMUTABLE() check is not performed
- devcgroup_inode_permission() is not called
- security_inode_permission() is not called
IS_RDONLY() should be unnecessary anyway, as the per-mount read-only
flag should provide protection against read-only remounts during
operations. do_gfs2_set_flags() has been fixed to perform
mnt_want_write()/mnt_drop_write() to protect against remounting
read-only.
IS_IMMUTABLE has been added to gfs2_permission()
Repeating the security checks seems to be pointless, as they don't
normally change, and if they do, it's independent of the filesystem
state.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
f58ba88910