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考虑加入 f2fs 支持 #10

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Artoria2e5 opened this issue Jul 19, 2014 · 0 comments
Open

考虑加入 f2fs 支持 #10

Artoria2e5 opened this issue Jul 19, 2014 · 0 comments

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@Artoria2e5
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在小米 2+ 中，默认的文件系统是（？，busybox 没有 file……）和（fuse的fat32？），其中 sd 卡 fat32 情况尤其可怕。（主要是空间浪费以及无可用 fsck）

我建议加入 f2fs 支持（同时内核 rebase 到 3.8+），原因是该文件系统有极好的闪存优化，也能提供很好的性能。至于（mi2+）虚拟 sdcard 也可以考虑使用该文件系统，毕竟文件传输的问题目前都已经转向 MTP/ADB 解决。
maxime-poulain pushed a commit to maxime-poulain/mi2_kernel that referenced this issue Oct 10, 2014
@gregkh
drivers/base/memory.c: fix show_mem_removable() to handle missing sec…
6e99f32 
…tions

commit 21ea9f5ace3a7317cc3ba1fbc749758021a83136 upstream.

"cat /sys/devices/system/memory/memory*/removable" crashed the system.

The problem is that show_mem_removable() is passing a
bad pfn to is_mem_section_removable(), which causes

    if (!node_online(page_to_nid(page)))

to blow up.  Why is it passing in a bad pfn?

The reason is that show_mem_removable() will loop sections_per_block
times.  sections_per_block is 16, but mem->section_count is 8,
indicating holes in this memory block.  Checking that the memory section
is present before checking to see if the memory section is removable
fixes the problem.

   harp5-sys:~ # cat /sys/devices/system/memory/memory*/removable
   0
   1
   1
   1
   1
   1
   1
   1
   1
   1
   1
   1
   1
   1
   BUG: unable to handle kernel paging request at ffffea00c3200000
   IP: [<ffffffff81117ed1>] is_pageblock_removable_nolock+0x1/0x90
   PGD 83ffd4067 PUD 37bdfce067 PMD 0
   Oops: 0000 [#1] SMP
   Modules linked in: autofs4 binfmt_misc rdma_ucm rdma_cm iw_cm ib_addr ib_srp scsi_transport_srp scsi_tgt ib_ipoib ib_cm ib_uverbs ib_umad iw_cxgb3 cxgb3 mdio mlx4_en mlx4_ib ib_sa mlx4_core ib_mthca ib_mad ib_core fuse nls_iso8859_1 nls_cp437 vfat fat joydev loop hid_generic usbhid hid hwperf(O) numatools(O) dm_mod iTCO_wdt ipv6 iTCO_vendor_support igb i2c_i801 ioatdma i2c_algo_bit ehci_pci pcspkr lpc_ich i2c_core ehci_hcd ptp sg mfd_core dca rtc_cmos pps_core mperf button xhci_hcd sd_mod crc_t10dif usbcore usb_common scsi_dh_emc scsi_dh_hp_sw scsi_dh_alua scsi_dh_rdac scsi_dh gru(O) xvma(O) xfs crc32c libcrc32c thermal sata_nv processor piix mptsas mptscsih scsi_transport_sas mptbase megaraid_sas fan thermal_sys hwmon ext3 jbd ata_piix ahci libahci libata scsi_mod
   CPU: 4 PID: 5991 Comm: cat Tainted: G           O 3.11.0-rc5-rja-uv+ MiCode#10
   Hardware name: SGI UV2000/ROMLEY, BIOS SGI UV 2000/3000 series BIOS 01/15/2013
   task: ffff88081f034580 ti: ffff880820022000 task.ti: ffff880820022000
   RIP: 0010:[<ffffffff81117ed1>]  [<ffffffff81117ed1>] is_pageblock_removable_nolock+0x1/0x90
   RSP: 0018:ffff880820023df8  EFLAGS: 00010287
   RAX: 0000000000040000 RBX: ffffea00c3200000 RCX: 0000000000000004
   RDX: ffffea00c30b0000 RSI: 00000000001c0000 RDI: ffffea00c3200000
   RBP: ffff880820023e38 R08: 0000000000000000 R09: 0000000000000001
   R10: 0000000000000000 R11: 0000000000000001 R12: ffffea00c33c0000
   R13: 0000160000000000 R14: 6db6db6db6db6db7 R15: 0000000000000001
   FS:  00007ffff7fb2700(0000) GS:ffff88083fc80000(0000) knlGS:0000000000000000
   CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
   CR2: ffffea00c3200000 CR3: 000000081b954000 CR4: 00000000000407e0
   Call Trace:
     show_mem_removable+0x41/0x70
     dev_attr_show+0x2a/0x60
     sysfs_read_file+0xf7/0x1c0
     vfs_read+0xc8/0x130
     SyS_read+0x5d/0xa0
     system_call_fastpath+0x16/0x1b

Signed-off-by: Russ Anderson <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Cc: Yinghai Lu <[email protected]>
Reviewed-by: Yasuaki Ishimatsu <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
maxime-poulain pushed a commit to maxime-poulain/mi2_kernel that referenced this issue May 25, 2015
@jtlayton
cifs: when CONFIG_HIGHMEM is set, serialize the read/write kmaps
4daadf0 
commit 3cf003c upstream.

[The async read code was broadened to include uncached reads in 3.5, so
the mainline patch did not apply directly. This patch is just a backport
to account for that change.]

Jian found that when he ran fsx on a 32 bit arch with a large wsize the
process and one of the bdi writeback kthreads would sometimes deadlock
with a stack trace like this:

crash> bt
PID: 2789   TASK: f02edaa0  CPU: 3   COMMAND: "fsx"
 #0 [eed63cbc] schedule at c083c5b3
 #1 [eed63d80] kmap_high at c0500ec8
 mitwo-dev#2 [eed63db0] cifs_async_writev at f7fabcd7 [cifs]
 MiCode#3 [eed63df0] cifs_writepages at f7fb7f5c [cifs]
 MiCode#4 [eed63e50] do_writepages at c04f3e32
 MiCode#5 [eed63e54] __filemap_fdatawrite_range at c04e152a
 MiCode#6 [eed63ea4] filemap_fdatawrite at c04e1b3e
 MiCode#7 [eed63eb4] cifs_file_aio_write at f7fa111a [cifs]
 MiCode#8 [eed63ecc] do_sync_write at c052d202
 MiCode#9 [eed63f74] vfs_write at c052d4ee
MiCode#10 [eed63f94] sys_write at c052df4c
MiCode#11 [eed63fb0] ia32_sysenter_target at c0409a98
    EAX: 00000004  EBX: 00000003  ECX: abd73b73  EDX: 012a65c6
    DS:  007b      ESI: 012a65c6  ES:  007b      EDI: 00000000
    SS:  007b      ESP: bf8db178  EBP: bf8db1f8  GS:  0033
    CS:  0073      EIP: 40000424  ERR: 00000004  EFLAGS: 00000246

Each task would kmap part of its address array before getting stuck, but
not enough to actually issue the write.

This patch fixes this by serializing the marshal_iov operations for
async reads and writes. The idea here is to ensure that cifs
aggressively tries to populate a request before attempting to fulfill
another one. As soon as all of the pages are kmapped for a request, then
we can unlock and allow another one to proceed.

There's no need to do this serialization on non-CONFIG_HIGHMEM arches
however, so optimize all of this out when CONFIG_HIGHMEM isn't set.

Reported-by: Jian Li <[email protected]>
Signed-off-by: Jeff Layton <[email protected]>
Signed-off-by: Steve French <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
maxime-poulain pushed a commit to maxime-poulain/mi2_kernel that referenced this issue May 25, 2015
@jtlayton
nfs: skip commit in releasepage if we're freeing memory for fs-relate…
6ca18de 
…d reasons

commit 5cf02d0 upstream.

We've had some reports of a deadlock where rpciod ends up with a stack
trace like this:

    PID: 2507   TASK: ffff88103691ab40  CPU: 14  COMMAND: "rpciod/14"
     #0 [ffff8810343bf2f0] schedule at ffffffff814dabd9
     #1 [ffff8810343bf3b8] nfs_wait_bit_killable at ffffffffa038fc04 [nfs]
     mitwo-dev#2 [ffff8810343bf3c8] __wait_on_bit at ffffffff814dbc2f
     MiCode#3 [ffff8810343bf418] out_of_line_wait_on_bit at ffffffff814dbcd8
     MiCode#4 [ffff8810343bf488] nfs_commit_inode at ffffffffa039e0c1 [nfs]
     MiCode#5 [ffff8810343bf4f8] nfs_release_page at ffffffffa038bef6 [nfs]
     MiCode#6 [ffff8810343bf528] try_to_release_page at ffffffff8110c670
     MiCode#7 [ffff8810343bf538] shrink_page_list.clone.0 at ffffffff81126271
     MiCode#8 [ffff8810343bf668] shrink_inactive_list at ffffffff81126638
     MiCode#9 [ffff8810343bf818] shrink_zone at ffffffff8112788f
    MiCode#10 [ffff8810343bf8c8] do_try_to_free_pages at ffffffff81127b1e
    MiCode#11 [ffff8810343bf958] try_to_free_pages at ffffffff8112812f
    MiCode#12 [ffff8810343bfa08] __alloc_pages_nodemask at ffffffff8111fdad
    MiCode#13 [ffff8810343bfb28] kmem_getpages at ffffffff81159942
    #14 [ffff8810343bfb58] fallback_alloc at ffffffff8115a55a
    #15 [ffff8810343bfbd8] ____cache_alloc_node at ffffffff8115a2d9
    #16 [ffff8810343bfc38] kmem_cache_alloc at ffffffff8115b09b
    #17 [ffff8810343bfc78] sk_prot_alloc at ffffffff81411808
    #18 [ffff8810343bfcb8] sk_alloc at ffffffff8141197c
    #19 [ffff8810343bfce8] inet_create at ffffffff81483ba6
    #20 [ffff8810343bfd38] __sock_create at ffffffff8140b4a7
    #21 [ffff8810343bfd98] xs_create_sock at ffffffffa01f649b [sunrpc]
    #22 [ffff8810343bfdd8] xs_tcp_setup_socket at ffffffffa01f6965 [sunrpc]
    #23 [ffff8810343bfe38] worker_thread at ffffffff810887d0
    #24 [ffff8810343bfee8] kthread at ffffffff8108dd96
    #25 [ffff8810343bff48] kernel_thread at ffffffff8100c1ca

rpciod is trying to allocate memory for a new socket to talk to the
server. The VM ends up calling ->releasepage to get more memory, and it
tries to do a blocking commit. That commit can't succeed however without
a connected socket, so we deadlock.

Fix this by setting PF_FSTRANS on the workqueue task prior to doing the
socket allocation, and having nfs_release_page check for that flag when
deciding whether to do a commit call. Also, set PF_FSTRANS
unconditionally in rpc_async_schedule since that function can also do
allocations sometimes.

Signed-off-by: Jeff Layton <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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@Artoria2e5