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    UBIFS: handle allocation failures in UBIFS write path · d882962f
    Matthew L. Creech 提交于
    Running kernel 2.6.37, my PPC-based device occasionally gets an
    order-2 allocation failure in UBIFS, which causes the root FS to
    become unwritable:
    
    kswapd0: page allocation failure. order:2, mode:0x4050
    Call Trace:
    [c787dc30] [c00085b8] show_stack+0x7c/0x194 (unreliable)
    [c787dc70] [c0061aec] __alloc_pages_nodemask+0x4f0/0x57c
    [c787dd00] [c0061b98] __get_free_pages+0x20/0x50
    [c787dd10] [c00e4f88] ubifs_jnl_write_data+0x54/0x200
    [c787dd50] [c00e82d4] do_writepage+0x94/0x198
    [c787dd90] [c00675e4] shrink_page_list+0x40c/0x77c
    [c787de40] [c0067de0] shrink_inactive_list+0x1e0/0x370
    [c787de90] [c0068224] shrink_zone+0x2b4/0x2b8
    [c787df00] [c0068854] kswapd+0x408/0x5d4
    [c787dfb0] [c0037bcc] kthread+0x80/0x84
    [c787dff0] [c000ef44] kernel_thread+0x4c/0x68
    
    Similar problems were encountered last April by Tomasz Stanislawski:
    
    http://patchwork.ozlabs.org/patch/50965/
    
    This patch implements Artem's suggested fix: fall back to a
    mutex-protected static buffer, allocated at mount time.  I tested it
    by forcing execution down the failure path, and didn't see any ill
    effects.
    
    Artem: massaged the patch a little, improved it so that we'd not
    allocate the write reserve buffer when we are in R/O mode.
    Signed-off-by: NMatthew L. Creech <mlcreech@gmail.com>
    Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
    d882962f
ubifs.h 60.3 KB