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    Btrfs: fix allocationg memory failure for btrfsic_state structure · 6b3a4d60
    Shilong Wang 提交于
    size of @btrfsic_state needs more than 2M, it is very likely to
    fail allocating memory using kzalloc(). see following mesage:
    
    [91428.902148] Call Trace:
    [<ffffffff816f6e0f>] dump_stack+0x4d/0x66
    [<ffffffff811b1c7f>] warn_alloc_failed+0xff/0x170
    [<ffffffff811b66e1>] __alloc_pages_nodemask+0x951/0xc30
    [<ffffffff811fd9da>] alloc_pages_current+0x11a/0x1f0
    [<ffffffff811b1e0b>] ? alloc_kmem_pages+0x3b/0xf0
    [<ffffffff811b1e0b>] alloc_kmem_pages+0x3b/0xf0
    [<ffffffff811d1018>] kmalloc_order+0x18/0x50
    [<ffffffff811d1074>] kmalloc_order_trace+0x24/0x140
    [<ffffffffa06c097b>] btrfsic_mount+0x8b/0xae0 [btrfs]
    [<ffffffff810af555>] ? check_preempt_curr+0x85/0xa0
    [<ffffffff810b2de3>] ? try_to_wake_up+0x103/0x430
    [<ffffffffa063d200>] open_ctree+0x1bd0/0x2130 [btrfs]
    [<ffffffffa060fdde>] btrfs_mount+0x62e/0x8b0 [btrfs]
    [<ffffffff811fd9da>] ? alloc_pages_current+0x11a/0x1f0
    [<ffffffff811b0a5e>] ? __get_free_pages+0xe/0x50
    [<ffffffff81230429>] mount_fs+0x39/0x1b0
    [<ffffffff812509fb>] vfs_kern_mount+0x6b/0x150
    [<ffffffff812537fb>] do_mount+0x27b/0xc30
    [<ffffffff811b0a5e>] ? __get_free_pages+0xe/0x50
    [<ffffffff812544f6>] SyS_mount+0x96/0xf0
    [<ffffffff81701970>] system_call_fastpath+0x16/0x1b
    
    Since we are allocating memory for hash table array, so
    it will be good if we could allocate continuous pages here.
    
    Fix this problem by firstly trying kzalloc(), if we fail,
    use vzalloc() instead.
    Signed-off-by: NWang Shilong <wangshilong1991@gmail.com>
    Signed-off-by: NChris Mason <clm@fb.com>
    6b3a4d60
check-integrity.c 99.5 KB