Section 9.1.2:
"In the case of READ, the server may perform the corresponding
check on the access mode, or it may choose to allow READ for
OPEN4_SHARE_ACCESS_WRITE, to accommodate clients whose WRITE
implementation may unavoidably do (e.g., due to buffer cache
constraints)."
Also in section 10.4.1
"Similarly, when closing a file opened for OPEN4_SHARE_ACCESS_WRITE/
OPEN4_SHARE_ACCESS_BOTH and if an OPEN_DELEGATE_WRITE delegation
is in effect"
This patch series offers write delegation for OPEN with OPEN4_SHARE_ACCESS_WRITE
only. The file struct, nfs4_file and nfs4_ol_stateid are upgraded
accordingly from write only access to read/write access. When the
delegation is returned, the file struct, nfs4_file and nfs4_ol_stateid
are downgraded according to remove the read access.
-- changes from v1:
0002: The file access mode is upgraded to include read access at the time
the delegation is granted and read access is removed when the delegation
is returned.
fs/nfsd/nfs4state.c | 96 +++++++++++++++++++++++++++++++++++++-----------
fs/nfsd/state.h | 2 +
2 files changed, 77 insertions(+), 21 deletions(-)
