From 3e60ffdd36fa518cc1822941dbb011e7a9adf513 Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Wed, 11 Jul 2012 16:30:14 -0400 Subject: [PATCH] NFS: Clean up nfs41_check_expired_stateid() Clean up: Instead of open-coded flag manipulation, use test_bit() and clear_bit() just like all other accessors of the state->flag field. This also eliminates several unnecessary implicit integer type conversions. To make it absolutely clear what is going on, a number of comments are introduced. Signed-off-by: Chuck Lever Signed-off-by: Trond Myklebust --- fs/nfs/nfs4proc.c | 77 +++++++++++++++++++++++++++++++++++++---------- 1 file changed, 61 insertions(+), 16 deletions(-) diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index d1c1016cd505..1364569f1d1d 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -1756,32 +1756,67 @@ static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *sta } #if defined(CONFIG_NFS_V4_1) -static int nfs41_check_expired_stateid(struct nfs4_state *state, nfs4_stateid *stateid, unsigned int flags) +static void nfs41_clear_delegation_stateid(struct nfs4_state *state) { struct nfs_server *server = NFS_SERVER(state->inode); - int status = -NFS4ERR_BAD_STATEID; - - if (state->flags & flags) { - status = nfs41_test_stateid(server, stateid); - if (status != NFS_OK) { - if (status != -NFS4ERR_BAD_STATEID) - nfs41_free_stateid(server, stateid); - state->flags &= ~flags; - } + nfs4_stateid *stateid = &state->stateid; + int status; + + /* If a state reset has been done, test_stateid is unneeded */ + if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) + return; + + status = nfs41_test_stateid(server, stateid); + if (status != NFS_OK) { + /* Free the stateid unless the server explicitly + * informs us the stateid is unrecognized. */ + if (status != -NFS4ERR_BAD_STATEID) + nfs41_free_stateid(server, stateid); + + clear_bit(NFS_DELEGATED_STATE, &state->flags); + } +} + +/** + * nfs41_check_open_stateid - possibly free an open stateid + * + * @state: NFSv4 state for an inode + * + * Returns NFS_OK if recovery for this stateid is now finished. + * Otherwise a negative NFS4ERR value is returned. + */ +static int nfs41_check_open_stateid(struct nfs4_state *state) +{ + struct nfs_server *server = NFS_SERVER(state->inode); + nfs4_stateid *stateid = &state->stateid; + int status; + + /* If a state reset has been done, test_stateid is unneeded */ + if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) && + (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) && + (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0)) + return -NFS4ERR_BAD_STATEID; + + status = nfs41_test_stateid(server, stateid); + if (status != NFS_OK) { + /* Free the stateid unless the server explicitly + * informs us the stateid is unrecognized. */ + if (status != -NFS4ERR_BAD_STATEID) + nfs41_free_stateid(server, stateid); + + clear_bit(NFS_O_RDONLY_STATE, &state->flags); + clear_bit(NFS_O_WRONLY_STATE, &state->flags); + clear_bit(NFS_O_RDWR_STATE, &state->flags); } return status; } static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) { - int deleg_flags = 1 << NFS_DELEGATED_STATE; - int open_flags = (1 << NFS_O_RDONLY_STATE) | (1 << NFS_O_WRONLY_STATE) | (1 << NFS_O_RDWR_STATE); int status; - nfs41_check_expired_stateid(state, &state->stateid, deleg_flags); - status = nfs41_check_expired_stateid(state, &state->open_stateid, - open_flags); - + nfs41_clear_delegation_stateid(state); + status = nfs41_check_open_stateid(state); if (status != NFS_OK) status = nfs4_open_expired(sp, state); return status; @@ -4689,6 +4724,14 @@ out: } #if defined(CONFIG_NFS_V4_1) +/** + * nfs41_check_expired_locks - possibly free a lock stateid + * + * @state: NFSv4 state for an inode + * + * Returns NFS_OK if recovery for this stateid is now finished. + * Otherwise a negative NFS4ERR value is returned. + */ static int nfs41_check_expired_locks(struct nfs4_state *state) { int status, ret = -NFS4ERR_BAD_STATEID; @@ -4699,6 +4742,8 @@ static int nfs41_check_expired_locks(struct nfs4_state *state) if (lsp->ls_flags & NFS_LOCK_INITIALIZED) { status = nfs41_test_stateid(server, &lsp->ls_stateid); if (status != NFS_OK) { + /* Free the stateid unless the server + * informs us the stateid is unrecognized. */ if (status != -NFS4ERR_BAD_STATEID) nfs41_free_stateid(server, &lsp->ls_stateid); -- 2.20.1