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    ext4: Use inode preallocation with -o noextents · 7061eba7
    Aneesh Kumar K.V 提交于
    When mballoc is enabled, block allocation for old block-based
    files are allocated using mballoc allocator instead of old
    block-based allocator. The old ext3 block reservation is turned
    off when mballoc is turned on.
    
    However, the in-core preallocation is not enabled for block-based/
    non-extent based file block allocation. This result in performance
    regression, as now we don't have "reservation" ore in-core preallocation
    to prevent interleaved fragmentation in multiple writes workload.
    
    This patch fix this by enable per inode in-core preallocation
    for non extent files when mballoc is used.
    Signed-off-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
    Signed-off-by: NMingming Cao <cmm@us.ibm.com>
    Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
    7061eba7
ext4.h 42.8 KB