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0deb232d3f
Support O_TMPFILE: Create an unlinked file and put it on the orphan list. If it ever gains a link, take it off the orphan list. Change MOVE_BLOCKS ioctl to allow moving blocks into offline extent ranges. Ioctl callers must set a new flag to enable this operation mode. RH-compat: tmpfile support it actually backported by RH into 3.10 kernel. We need to use some of their kabi-maintaining wrappers to use it: use a struct inode_operations_wrapper instead of base struct inode_operations, set S_IOPS_WRAPPER flag in i_flags. This lets RH's modified vfs_tmpfile() find our tmpfile fn pointer. Add a test that tests both creating tmpfiles as well as moving their contents into a destination file via MOVE_BLOCKS. xfstests common/004 now runs because tmpfile is supported. Signed-off-by: Andy Grover <agrover@versity.com>