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    Btrfs: fix race with freeze and free space inodes · 98114659
    Josef Bacik 提交于
    So we start our freeze, somebody comes in and does an fsync() on a file
    where we have to commit a transaction for whatever reason, and we will
    deadlock because the freeze is waiting on FS_FREEZE people to stop writing
    to the file system, but the transaction is waiting for its free space inodes
    to be written out, which are in turn waiting on sb_start_intwrite while
    trying to write the file extents.  To fix this we'll just skip the
    sb_start_intwrite() if we TRANS_JOIN_NOLOCK since we're being waited on by a
    transaction commit so we're safe wrt to freeze and this will keep us from
    deadlocking.  Thanks,
    Signed-off-by: NJosef Bacik <jbacik@fusionio.com>
    98114659
transaction.c 45.5 KB