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authorTrond Myklebust <Trond.Myklebust@netapp.com>2006-01-03 09:55:13 +0100
committerTrond Myklebust <Trond.Myklebust@netapp.com>2006-01-06 14:58:43 -0500
commite761692381f294ea079d2e869fcd7c0afc79e394 (patch)
tree34ebc00c001cddc94866936c460547d311e5dabb /fs/nfs
parentcdd4e68b5f0ed12c64b3e2be83655d2a47588a74 (diff)
NFSv4: Make nfs4_state track O_RDWR, O_RDONLY and O_WRONLY separately
A closer reading of RFC3530 reveals that OPEN_DOWNGRADE must always specify a access modes that have been the argument of a previous OPEN operation. IOW: doing OPEN(O_RDWR) and then OPEN_DOWNGRADE(O_WRONLY) is forbidden unless the user called OPEN(O_WRONLY) In order to fix that, we really need to track the three possible open states separately. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/nfs4_fs.h5
-rw-r--r--fs/nfs/nfs4proc.c34
-rw-r--r--fs/nfs/nfs4state.c31
3 files changed, 42 insertions, 28 deletions
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index b7f262dcb6e..4ad5981f937 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -182,8 +182,9 @@ struct nfs4_state {
nfs4_stateid stateid;
- unsigned int nreaders;
- unsigned int nwriters;
+ unsigned int n_rdonly;
+ unsigned int n_wronly;
+ unsigned int n_rdwr;
int state; /* State on the server (R,W, or RW) */
atomic_t count;
};
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 8154f257946..e494cc2ea98 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -297,6 +297,20 @@ static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
return ret;
}
+static inline void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
+{
+ switch (open_flags) {
+ case FMODE_WRITE:
+ state->n_wronly++;
+ break;
+ case FMODE_READ:
+ state->n_rdonly++;
+ break;
+ case FMODE_READ|FMODE_WRITE:
+ state->n_rdwr++;
+ }
+}
+
static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
{
struct inode *inode = state->inode;
@@ -306,10 +320,7 @@ static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid,
spin_lock(&state->owner->so_lock);
spin_lock(&inode->i_lock);
memcpy(&state->stateid, stateid, sizeof(state->stateid));
- if ((open_flags & FMODE_WRITE))
- state->nwriters++;
- if (open_flags & FMODE_READ)
- state->nreaders++;
+ update_open_stateflags(state, open_flags);
nfs4_state_set_mode_locked(state, state->state | open_flags);
spin_unlock(&inode->i_lock);
spin_unlock(&state->owner->so_lock);
@@ -822,10 +833,7 @@ static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred
err = -ENOENT;
if ((state->state & open_flags) == open_flags) {
spin_lock(&inode->i_lock);
- if (open_flags & FMODE_READ)
- state->nreaders++;
- if (open_flags & FMODE_WRITE)
- state->nwriters++;
+ update_open_stateflags(state, open_flags);
spin_unlock(&inode->i_lock);
goto out_ok;
} else if (state->state != 0)
@@ -1082,10 +1090,12 @@ static void nfs4_close_prepare(struct rpc_task *task, void *data)
spin_lock(&state->owner->so_lock);
spin_lock(&calldata->inode->i_lock);
mode = old_mode = state->state;
- if (state->nreaders == 0)
- mode &= ~FMODE_READ;
- if (state->nwriters == 0)
- mode &= ~FMODE_WRITE;
+ if (state->n_rdwr == 0) {
+ if (state->n_rdonly == 0)
+ mode &= ~FMODE_READ;
+ if (state->n_wronly == 0)
+ mode &= ~FMODE_WRITE;
+ }
nfs4_state_set_mode_locked(state, mode);
spin_unlock(&calldata->inode->i_lock);
spin_unlock(&state->owner->so_lock);
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 5ef4c57618f..41a5f1a8a98 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -349,14 +349,9 @@ nfs4_alloc_open_state(void)
{
struct nfs4_state *state;
- state = kmalloc(sizeof(*state), GFP_KERNEL);
+ state = kzalloc(sizeof(*state), GFP_KERNEL);
if (!state)
return NULL;
- state->state = 0;
- state->nreaders = 0;
- state->nwriters = 0;
- state->flags = 0;
- memset(state->stateid.data, 0, sizeof(state->stateid.data));
atomic_set(&state->count, 1);
INIT_LIST_HEAD(&state->lock_states);
spin_lock_init(&state->state_lock);
@@ -475,15 +470,23 @@ void nfs4_close_state(struct nfs4_state *state, mode_t mode)
/* Protect against nfs4_find_state() */
spin_lock(&owner->so_lock);
spin_lock(&inode->i_lock);
- if (mode & FMODE_READ)
- state->nreaders--;
- if (mode & FMODE_WRITE)
- state->nwriters--;
+ switch (mode & (FMODE_READ | FMODE_WRITE)) {
+ case FMODE_READ:
+ state->n_rdonly--;
+ break;
+ case FMODE_WRITE:
+ state->n_wronly--;
+ break;
+ case FMODE_READ|FMODE_WRITE:
+ state->n_rdwr--;
+ }
oldstate = newstate = state->state;
- if (state->nreaders == 0)
- newstate &= ~FMODE_READ;
- if (state->nwriters == 0)
- newstate &= ~FMODE_WRITE;
+ if (state->n_rdwr == 0) {
+ if (state->n_rdonly == 0)
+ newstate &= ~FMODE_READ;
+ if (state->n_wronly == 0)
+ newstate &= ~FMODE_WRITE;
+ }
if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
nfs4_state_set_mode_locked(state, newstate);
oldstate = newstate;