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02f302fc5b
Refactor selinux_restorecon(3) to allow for distributing the relabeling to multiple threads and add a new function selinux_restorecon_parallel(3), which allows specifying the number of threads to use. The existing selinux_restorecon(3) function maintains the same interface and maintains the same behavior (i.e. relabeling is done on a single thread). The parallel implementation takes a simple approach of performing all the directory tree traversal in a critical section and only letting the relabeling of individual objects run in parallel. Thankfully, this approach turns out to be efficient enough in practice, as shown by restorecon benchmarks (detailed in a subsequent patch that switches setfiles & restorecon to use selinux_restorecon_parallel(3)). Note that to be able to use the parallelism, the calling application/ library must be explicitly linked to the libpthread library (statically or dynamically). This is necessary to mantain the requirement that libselinux shouldn't explicitly link with libpthread. (I don't know what exactly was the reason behind this requirement as the commit logs are fuzzy, but special care has been taken in the past to maintain it, so I didn't want to break it...) Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com> |
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