perf trace: Split fd -> pathname array handling
So that the part that grows the array as needed is untied from the code that reads the /proc/pid/fd symlink and can be used for the vfs_getname hook that will set the fd -> path translation too, when available. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-ydo5rumyv9hdc1vsfmqamugs@git.kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
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