fellow_log: Bring back obj deref during FP_INIT
8134e93b broke object deletions during FP_INIT, because fellow_dskbuddy() waits for FP_OPEN: #3 0x00007f3f51a85d2b in fellow_wait_open (ffd=0x7f3f445a8000) at fellow_log.c:847 #4 fellow_dskbuddy (ffd=0x7f3f445a8000) at fellow_log.c:6381 #5 0x00007f3f51aa31f7 in fellow_cache_obj_delete (fc=0x7f3f446d4000, fco=<optimized out>, hash=hash@entry=0x7f3f404ce670 "ǹ\216N\032\217\230},p\245\205\361i \002\253\253Rn\372ز\303\307\355,\254\342\024\360M") at fellow_cache.c:6032 #6 0x00007f3f51a597a9 in sfedsk_objfree (wrk=0x7f3f40dfc5d0, dskoc=0x7f3f404d5440) at fellow_storage.c:655 #7 0x0000564d8e23c14a in ObjFreeObj (wrk=wrk@entry=0x7f3f40dfc5d0, oc=0x7f3f404d5440) at cache/cache_obj.c:412 #8 0x0000564d8e232a9f in HSH_DerefObjCore (wrk=0x7f3f40dfc5d0, ocp=ocp@entry=0x7fffcd3303d0, rushmax=rushmax@entry=-1) at cache/cache_hash.c:1065 #9 0x00007f3f51a5022f in festash_work_fes (fet=fet@entry=0x7fffcd33bbf0, fes=0x7f3e7a006640, ban=ban@entry=0x7ee790c56160) at fellow_stash.h:195 #10 0x00007f3f51a54be2 in festash_top_work (fet=fet@entry=0x7fffcd33bbf0, has_bans=1) at fellow_stash.h:226 #11 0x00007f3f51a586b8 in sfe_resurrect_ban (e=0x7f3e401d7c98, sfer=0x7fffcd33bbb0) at fellow_storage.c:2078 #12 sfe_resurrect (priv=0x7fffcd33bbb0, e=0x7f3e401d7c98) at fellow_storage.c:2111 #13 0x00007f3f51a81163 in fellow_logs_iter_block (flics=flics@entry=0x7fffcd332b80, flivs=flivs@entry=0x7fffcd337050, logblk=logblk@entry=0x7f3e401d7000) at fellow_log.c:4834 #14 0x00007f3f51a82864 in fellow_logs_iter (flics=0x7fffcd332b80, flivs=flivs@entry=0x7fffcd337050, active_logregion=0x7f3f445a8360, empty_logregion=0x7f3f445a8370, off=594695172096, off@entry=656178581504) at fellow_log.c:5294 #15 0x00007f3f51a84886 in fellow_logs_rewrite (ffd=ffd@entry=0x7f3f445a8000, new_log_fdr=new_log_fdr@entry=0x0, resur_f=resur_f@entry=0x7f3f51a57da0 <sfe_resurrect>, resur_priv=resur_priv@entry=0x7fffcd33bbb0) at fellow_log.c:5789 #16 0x00007f3f51a8763b in fellow_log_open (ffd=0x7f3f445a8000, resur_f=resur_f@entry=0x7f3f51a57da0 <sfe_resurrect>, resur_priv=resur_priv@entry=0x7fffcd33bbb0) at fellow_log.c:6809 #17 0x00007f3f51a5516a in sfe_open_task (priv=0x7fffcd33bbb0, wrk=<optimized out>) at fellow_storage.c:2199 But rather than bringing this back, we postpone deletion work with a thin delete.
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