Correct is_open_for_read and is_open_for_write

Signed-off-by: Malahal Naineni <malahal@us.ibm.com>
Reviewed-by: Frank S. Filz <ffilzlnx@mindspring.com>
nfs4_do_open_downgrade() doesn't modify state param

Modified it to take "state_t *" rather than "state_t **"

Signed-off-by: Malahal Naineni <malahal@us.ibm.com>
Reviewed-by: Frank S. Filz <ffilzlnx@mindspring.com>
Downgrade open flags when a state is removed or downgraded

Currently if two processes open the file, one in read-only mode and the
other in read-write/write mode, the file is kept open in read-write mode
as long as either of them keep the file open. With this patch, the file
is downgraded to read-only mode when the second process closes the file.

Signed-off-by: Malahal Naineni <malahal@us.ibm.com>
Reviewed-by: Frank S. Filz <ffilzlnx@mindspring.com>
Reviewed-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Merge branch 'tp/for_dev_20_idmap_typos' into ibm_next_20_tmp
Merge branch 'tp/for_dev_20_deleg_state_unlock_fix' into ibm_next_20_tmp
Merge branch 'tp/access.cleanup' into ibm_next_20_tmp
Merge branch 'tp/gpfs.mknode' into ibm_next_20_tmp
Merge branch 'tp/adjust.openflags' into ibm_next_20_tmp