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NFS: Clean up nfs41_check_expired_stateid()

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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 <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever 2012-07-11 16:30:14 -04:00 committed by Trond Myklebust
parent eb64cf964d
commit 3e60ffdd36
1 changed files with 60 additions and 15 deletions
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75
fs/nfs/nfs4proc.c
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@ -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;
nfs4_stateid *stateid = &state->stateid;
int status;
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;
}
/* 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);