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authorMiklos Szeredi <mszeredi@redhat.com>2016-07-29 13:05:23 +0300
committerMiklos Szeredi <mszeredi@redhat.com>2016-07-29 13:05:23 +0300
commit9c630ebefeeee4363ffd29f2f9b18eddafc6479c (patch)
tree377086556cf88b99ffba8b935c6a72d1f365ba9c /fs/sysfs/symlink.c
parent754f8cb72b42a3a6100d2bbb1cb885361a7310dd (diff)
downloadlinux-9c630ebefeeee4363ffd29f2f9b18eddafc6479c.tar.xz
ovl: simplify permission checking
The fact that we always do permission checking on the overlay inode and clear MAY_WRITE for checking access to the lower inode allows cruft to be removed from ovl_permission(). 1) "default_permissions" option effectively did generic_permission() on the overlay inode with i_mode, i_uid and i_gid updated from underlying filesystem. This is what we do by default now. It did the update using vfs_getattr() but that's only needed if the underlying filesystem can change (which is not allowed). We may later introduce a "paranoia_mode" that verifies that mode/uid/gid are not changed. 2) splitting out the IS_RDONLY() check from inode_permission() also becomes unnecessary once we remove the MAY_WRITE from the lower inode check. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
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