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    jbd2: cleanup needed free block estimates when starting a transaction · 76c39904
    Jan Kara 提交于
    __jbd2_log_space_left() and jbd_space_needed() were kind of odd.
    jbd_space_needed() accounted also credits needed for currently
    committing transaction while it didn't account for credits needed for
    control blocks.  __jbd2_log_space_left() then accounted for control
    blocks as a fraction of free space.  Since results of these two
    functions are always only compared against each other, this works
    correct but is somewhat strange.  Move the estimates so that
    jbd_space_needed() returns number of blocks needed for a transaction
    including control blocks and __jbd2_log_space_left() returns free
    space in the journal (with the committing transaction already
    subtracted).  Rename functions to jbd2_log_space_left() and
    jbd2_space_needed() while we are changing them.
    Reviewed-by: NZheng Liu <wenqing.lz@taobao.com>
    Signed-off-by: NJan Kara <jack@suse.cz>
    Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
    76c39904
jbd2.h 41.8 KB