From 8bda4e4c98d14566fc1a354c62fb59d70cc49b97 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Mon, 9 Jul 2007 10:45:42 -0400 Subject: NFSv4: Fix up stateid locking... We really don't need to grab both the state->so_owner and the inode->i_lock. Signed-off-by: Trond Myklebust --- fs/nfs/nfs4proc.c | 27 +++++++++++---------------- 1 file changed, 11 insertions(+), 16 deletions(-) (limited to 'fs/nfs/nfs4proc.c') diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 3a2af8053767..ba86ec654c2e 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -385,29 +385,28 @@ static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid * static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags) { - spin_lock(&state->owner->so_lock); - spin_lock(&state->inode->i_lock); + write_seqlock(&state->seqlock); nfs_set_open_stateid_locked(state, stateid, open_flags); - spin_unlock(&state->inode->i_lock); - spin_unlock(&state->owner->so_lock); + write_sequnlock(&state->seqlock); } static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags) { - struct inode *inode = state->inode; - open_flags &= (FMODE_READ|FMODE_WRITE); - /* Protect against nfs4_find_state_byowner() */ - spin_lock(&state->owner->so_lock); - spin_lock(&inode->i_lock); + /* + * Protect the call to nfs4_state_set_mode_locked and + * serialise the stateid update + */ + write_seqlock(&state->seqlock); if (deleg_stateid != NULL) { memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data)); set_bit(NFS_DELEGATED_STATE, &state->flags); } if (open_stateid != NULL) nfs_set_open_stateid_locked(state, open_stateid, open_flags); + write_sequnlock(&state->seqlock); + spin_lock(&state->owner->so_lock); update_open_stateflags(state, open_flags); - spin_unlock(&inode->i_lock); spin_unlock(&state->owner->so_lock); } @@ -608,12 +607,10 @@ static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state * */ if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 && memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) { - spin_lock(&state->owner->so_lock); - spin_lock(&state->inode->i_lock); + write_seqlock(&state->seqlock); if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)); - spin_unlock(&state->inode->i_lock); - spin_unlock(&state->owner->so_lock); + write_sequnlock(&state->seqlock); } return 0; } @@ -1280,7 +1277,6 @@ static void nfs4_close_prepare(struct rpc_task *task, void *data) mode = FMODE_READ|FMODE_WRITE; clear_rd = clear_wr = clear_rdwr = 0; spin_lock(&state->owner->so_lock); - spin_lock(&calldata->inode->i_lock); /* Calculate the change in open mode */ if (state->n_rdwr == 0) { if (state->n_rdonly == 0) { @@ -1294,7 +1290,6 @@ static void nfs4_close_prepare(struct rpc_task *task, void *data) clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags); } } - spin_unlock(&calldata->inode->i_lock); spin_unlock(&state->owner->so_lock); if (!clear_rd && !clear_wr && !clear_rdwr) { /* Note: exit _without_ calling nfs4_close_done */ -- cgit v1.2.2