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    Btrfs: try to only do one btrfs_search_slot in do_setxattr · fa09200b
    Josef Bacik 提交于
    I've been watching how many btrfs_search_slot()'s we do and I noticed that when
    we create a file with selinux enabled we were doing 2 each time we initialize
    the security context.  That's because we lookup the xattr first so we can delete
    it if we're setting a new value to an existing xattr.  But in the create case we
    don't have any xattrs, so it is completely useless to have the extra lookup.  So
    re-arrange things so that we only lookup first if we specifically have
    XATTR_REPLACE.  That way in the basic case we only do 1 search, and in the more
    complicated case we do the normal 2 lookups.  Thanks,
    Signed-off-by: NJosef Bacik <josef@redhat.com>
    fa09200b
dir-item.c 12.3 KB