Implement Samsung's FMODE_NONMAPPABLE flag from sdcardfs version 2.1.4 as we hit a BUG on ext4: [ 49.655037]@0 Kernel BUG at ffffffc0001deeec [verbose debug info unavailable] [ 49.655045]@0 Internal error: Oops - BUG: 0 [#1] PREEMPT SMP [ 49.655052]@0 Modules linked in: [ 49.655061]@0 CPU: 0 PID: 283 Comm: kworker/u8:7 Tainted: G W 3.18.20-perf-g3be2054-00086-ga8307fb #1 [ 49.655070]@0 Hardware name: Qualcomm Technologies, Inc. MSM 8996 v3 + PMI8996 MTP (DT) [ 49.655077]@0 Workqueue: writeback bdi_writeback_workfn (flush-8:0) [ 49.655096]@0 task: ffffffc174ba8b00 ti: ffffffc174bb4000 task.ti: ffffffc174bb4000 [ 49.655108]@0 PC is at mpage_prepare_extent_to_map+0x198/0x218 [ 49.655116]@0 LR is at mpage_prepare_extent_to_map+0x110/0x218 [ 49.655121]@0 pc : [<ffffffc0001deeec>] lr : [<ffffffc0001dee64>] pstate: 60000145 [ 49.655126]@0 sp : ffffffc174bb7800 [ 49.655130]@0 x29: ffffffc174bb7800 x28: ffffffc174bb7880 [ 49.655140]@0 x27: 000000000000000d x26: ffffffc1245505e8 [ 49.655149]@0 x25: 0000000000000000 x24: 0000000000003400 [ 49.655160]@0 x23: ffffffffffffffff x22: 0000000000000000 [ 49.655172]@0 x21: ffffffc174bb7888 x20: ffffffc174bb79e0 [ 49.655182]@0 x19: ffffffbdc4ee7b80 x18: 0000007f92872000 [ 49.655191]@0 x17: 0000007f959b6424 x16: ffffffc00016d1ac [ 49.655201]@0 x15: 0000007f9285d158 x14: ffffffc1734796e8 [ 49.655210]@0 x13: ffffffbdc1ffa4c0 x12: ffffffbdc4ee7b80 [ 49.655220]@0 x11: 0000000000000100 x10: 0000000000000000 [ 49.655229]@0 x9 : 0000000000000000 x8 : ffffffc0b444e210 [ 49.655237]@0 x7 : 0000000000000000 x6 : ffffffc0b444e1e0 [ 49.655246]@0 x5 : 0000000000000000 x4 : 0000000000000001 [ 49.655254]@0 x3 : 0000000000000000 x2 : 400000000002003d [ 49.655263]@0 x1 : ffffffbdc4ee7b80 x0 : 400000000002003d [ 49.655271]@0 [ 49.656502]@0 Process kworker/u8:7 (pid: 283, stack limit = 0xffffffc174bb4058) [ 49.656509]@0 Call trace: [ 49.656514]@0 [<ffffffc0001deeec>] mpage_prepare_extent_to_map+0x198/0x218 [ 49.656526]@0 [<ffffffc0001e28d0>] ext4_writepages+0x270/0xa58 [ 49.656533]@0 [<ffffffc00012982c>] do_writepages+0x24/0x40 [ 49.656541]@0 [<ffffffc000180160>] __writeback_single_inode+0x40/0x114 [ 49.656549]@0 [<ffffffc000180e50>] writeback_sb_inodes+0x1dc/0x34c [ 49.656555]@0 [<ffffffc00018103c>] __writeback_inodes_wb+0x7c/0xc4 [ 49.656560]@0 [<ffffffc000181224>] wb_writeback+0x110/0x1a8 [ 49.656565]@0 [<ffffffc000181344>] wb_check_old_data_flush+0x88/0x98 [ 49.656571]@0 [<ffffffc00018156c>] bdi_writeback_workfn+0xf4/0x1fc [ 49.656576]@0 [<ffffffc0000b14f8>] process_one_work+0x1e0/0x300 [ 49.656585]@0 [<ffffffc0000b1e14>] worker_thread+0x318/0x438 [ 49.656590]@0 [<ffffffc0000b5da0>] kthread+0xe0/0xec [ 49.656598]@0 Code: f9400260 f9400a63 1ad92063 37580040 (e7f001f2) [ 49.656604]@0 ---[ end trace cbed09f772fd630d ]--- Change-Id: I931da7cb3841db1f130dba298a7d256b6f02d1bc

Fix for low mic #1

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