diff options
Diffstat (limited to 'fs/nfs/nfs4state.c')
| -rw-r--r-- | fs/nfs/nfs4state.c | 932 |
1 files changed, 932 insertions, 0 deletions
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c new file mode 100644 index 000000000000..231cebce3c87 --- /dev/null +++ b/fs/nfs/nfs4state.c @@ -0,0 +1,932 @@ +/* + * fs/nfs/nfs4state.c + * + * Client-side XDR for NFSv4. + * + * Copyright (c) 2002 The Regents of the University of Michigan. + * All rights reserved. + * + * Kendrick Smith <kmsmith@umich.edu> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR + * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Implementation of the NFSv4 state model. For the time being, + * this is minimal, but will be made much more complex in a + * subsequent patch. + */ + +#include <linux/config.h> +#include <linux/slab.h> +#include <linux/smp_lock.h> +#include <linux/nfs_fs.h> +#include <linux/nfs_idmap.h> +#include <linux/workqueue.h> +#include <linux/bitops.h> + +#include "callback.h" +#include "delegation.h" + +#define OPENOWNER_POOL_SIZE 8 + +static DEFINE_SPINLOCK(state_spinlock); + +nfs4_stateid zero_stateid; + +#if 0 +nfs4_stateid one_stateid = + { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; +#endif + +static LIST_HEAD(nfs4_clientid_list); + +static void nfs4_recover_state(void *); +extern void nfs4_renew_state(void *); + +void +init_nfsv4_state(struct nfs_server *server) +{ + server->nfs4_state = NULL; + INIT_LIST_HEAD(&server->nfs4_siblings); +} + +void +destroy_nfsv4_state(struct nfs_server *server) +{ + if (server->mnt_path) { + kfree(server->mnt_path); + server->mnt_path = NULL; + } + if (server->nfs4_state) { + nfs4_put_client(server->nfs4_state); + server->nfs4_state = NULL; + } +} + +/* + * nfs4_get_client(): returns an empty client structure + * nfs4_put_client(): drops reference to client structure + * + * Since these are allocated/deallocated very rarely, we don't + * bother putting them in a slab cache... + */ +static struct nfs4_client * +nfs4_alloc_client(struct in_addr *addr) +{ + struct nfs4_client *clp; + + if (nfs_callback_up() < 0) + return NULL; + if ((clp = kmalloc(sizeof(*clp), GFP_KERNEL)) == NULL) { + nfs_callback_down(); + return NULL; + } + memset(clp, 0, sizeof(*clp)); + memcpy(&clp->cl_addr, addr, sizeof(clp->cl_addr)); + init_rwsem(&clp->cl_sem); + INIT_LIST_HEAD(&clp->cl_delegations); + INIT_LIST_HEAD(&clp->cl_state_owners); + INIT_LIST_HEAD(&clp->cl_unused); + spin_lock_init(&clp->cl_lock); + atomic_set(&clp->cl_count, 1); + INIT_WORK(&clp->cl_recoverd, nfs4_recover_state, clp); + INIT_WORK(&clp->cl_renewd, nfs4_renew_state, clp); + INIT_LIST_HEAD(&clp->cl_superblocks); + init_waitqueue_head(&clp->cl_waitq); + rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS4 client"); + clp->cl_boot_time = CURRENT_TIME; + clp->cl_state = 1 << NFS4CLNT_OK; + return clp; +} + +static void +nfs4_free_client(struct nfs4_client *clp) +{ + struct nfs4_state_owner *sp; + + while (!list_empty(&clp->cl_unused)) { + sp = list_entry(clp->cl_unused.next, + struct nfs4_state_owner, + so_list); + list_del(&sp->so_list); + kfree(sp); + } + BUG_ON(!list_empty(&clp->cl_state_owners)); + if (clp->cl_cred) + put_rpccred(clp->cl_cred); + nfs_idmap_delete(clp); + if (clp->cl_rpcclient) + rpc_shutdown_client(clp->cl_rpcclient); + kfree(clp); + nfs_callback_down(); +} + +static struct nfs4_client *__nfs4_find_client(struct in_addr *addr) +{ + struct nfs4_client *clp; + list_for_each_entry(clp, &nfs4_clientid_list, cl_servers) { + if (memcmp(&clp->cl_addr, addr, sizeof(clp->cl_addr)) == 0) { + atomic_inc(&clp->cl_count); + return clp; + } + } + return NULL; +} + +struct nfs4_client *nfs4_find_client(struct in_addr *addr) +{ + struct nfs4_client *clp; + spin_lock(&state_spinlock); + clp = __nfs4_find_client(addr); + spin_unlock(&state_spinlock); + return clp; +} + +struct nfs4_client * +nfs4_get_client(struct in_addr *addr) +{ + struct nfs4_client *clp, *new = NULL; + + spin_lock(&state_spinlock); + for (;;) { + clp = __nfs4_find_client(addr); + if (clp != NULL) + break; + clp = new; + if (clp != NULL) { + list_add(&clp->cl_servers, &nfs4_clientid_list); + new = NULL; + break; + } + spin_unlock(&state_spinlock); + new = nfs4_alloc_client(addr); + spin_lock(&state_spinlock); + if (new == NULL) + break; + } + spin_unlock(&state_spinlock); + if (new) + nfs4_free_client(new); + return clp; +} + +void +nfs4_put_client(struct nfs4_client *clp) +{ + if (!atomic_dec_and_lock(&clp->cl_count, &state_spinlock)) + return; + list_del(&clp->cl_servers); + spin_unlock(&state_spinlock); + BUG_ON(!list_empty(&clp->cl_superblocks)); + wake_up_all(&clp->cl_waitq); + rpc_wake_up(&clp->cl_rpcwaitq); + nfs4_kill_renewd(clp); + nfs4_free_client(clp); +} + +static int __nfs4_init_client(struct nfs4_client *clp) +{ + int status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, nfs_callback_tcpport); + if (status == 0) + status = nfs4_proc_setclientid_confirm(clp); + if (status == 0) + nfs4_schedule_state_renewal(clp); + return status; +} + +int nfs4_init_client(struct nfs4_client *clp) +{ + return nfs4_map_errors(__nfs4_init_client(clp)); +} + +u32 +nfs4_alloc_lockowner_id(struct nfs4_client *clp) +{ + return clp->cl_lockowner_id ++; +} + +static struct nfs4_state_owner * +nfs4_client_grab_unused(struct nfs4_client *clp, struct rpc_cred *cred) +{ + struct nfs4_state_owner *sp = NULL; + + if (!list_empty(&clp->cl_unused)) { + sp = list_entry(clp->cl_unused.next, struct nfs4_state_owner, so_list); + atomic_inc(&sp->so_count); + sp->so_cred = cred; + list_move(&sp->so_list, &clp->cl_state_owners); + clp->cl_nunused--; + } + return sp; +} + +static struct nfs4_state_owner * +nfs4_find_state_owner(struct nfs4_client *clp, struct rpc_cred *cred) +{ + struct nfs4_state_owner *sp, *res = NULL; + + list_for_each_entry(sp, &clp->cl_state_owners, so_list) { + if (sp->so_cred != cred) + continue; + atomic_inc(&sp->so_count); + /* Move to the head of the list */ + list_move(&sp->so_list, &clp->cl_state_owners); + res = sp; + break; + } + return res; +} + +/* + * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to + * create a new state_owner. + * + */ +static struct nfs4_state_owner * +nfs4_alloc_state_owner(void) +{ + struct nfs4_state_owner *sp; + + sp = kmalloc(sizeof(*sp),GFP_KERNEL); + if (!sp) + return NULL; + init_MUTEX(&sp->so_sema); + sp->so_seqid = 0; /* arbitrary */ + INIT_LIST_HEAD(&sp->so_states); + INIT_LIST_HEAD(&sp->so_delegations); + atomic_set(&sp->so_count, 1); + return sp; +} + +void +nfs4_drop_state_owner(struct nfs4_state_owner *sp) +{ + struct nfs4_client *clp = sp->so_client; + spin_lock(&clp->cl_lock); + list_del_init(&sp->so_list); + spin_unlock(&clp->cl_lock); +} + +/* + * Note: must be called with clp->cl_sem held in order to prevent races + * with reboot recovery! + */ +struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred) +{ + struct nfs4_client *clp = server->nfs4_state; + struct nfs4_state_owner *sp, *new; + + get_rpccred(cred); + new = nfs4_alloc_state_owner(); + spin_lock(&clp->cl_lock); + sp = nfs4_find_state_owner(clp, cred); + if (sp == NULL) + sp = nfs4_client_grab_unused(clp, cred); + if (sp == NULL && new != NULL) { + list_add(&new->so_list, &clp->cl_state_owners); + new->so_client = clp; + new->so_id = nfs4_alloc_lockowner_id(clp); + new->so_cred = cred; + sp = new; + new = NULL; + } + spin_unlock(&clp->cl_lock); + if (new) + kfree(new); + if (sp != NULL) + return sp; + put_rpccred(cred); + return NULL; +} + +/* + * Must be called with clp->cl_sem held in order to avoid races + * with state recovery... + */ +void nfs4_put_state_owner(struct nfs4_state_owner *sp) +{ + struct nfs4_client *clp = sp->so_client; + struct rpc_cred *cred = sp->so_cred; + + if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) + return; + if (clp->cl_nunused >= OPENOWNER_POOL_SIZE) + goto out_free; + if (list_empty(&sp->so_list)) + goto out_free; + list_move(&sp->so_list, &clp->cl_unused); + clp->cl_nunused++; + spin_unlock(&clp->cl_lock); + put_rpccred(cred); + cred = NULL; + return; +out_free: + list_del(&sp->so_list); + spin_unlock(&clp->cl_lock); + put_rpccred(cred); + kfree(sp); +} + +static struct nfs4_state * +nfs4_alloc_open_state(void) +{ + struct nfs4_state *state; + + state = kmalloc(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); + init_MUTEX(&state->lock_sema); + rwlock_init(&state->state_lock); + return state; +} + +static struct nfs4_state * +__nfs4_find_state(struct inode *inode, struct rpc_cred *cred, mode_t mode) +{ + struct nfs_inode *nfsi = NFS_I(inode); + struct nfs4_state *state; + + mode &= (FMODE_READ|FMODE_WRITE); + list_for_each_entry(state, &nfsi->open_states, inode_states) { + if (state->owner->so_cred != cred) + continue; + if ((mode & FMODE_READ) != 0 && state->nreaders == 0) + continue; + if ((mode & FMODE_WRITE) != 0 && state->nwriters == 0) + continue; + if ((state->state & mode) != mode) + continue; + atomic_inc(&state->count); + if (mode & FMODE_READ) + state->nreaders++; + if (mode & FMODE_WRITE) + state->nwriters++; + return state; + } + return NULL; +} + +static struct nfs4_state * +__nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) +{ + struct nfs_inode *nfsi = NFS_I(inode); + struct nfs4_state *state; + + list_for_each_entry(state, &nfsi->open_states, inode_states) { + /* Is this in the process of being freed? */ + if (state->nreaders == 0 && state->nwriters == 0) + continue; + if (state->owner == owner) { + atomic_inc(&state->count); + return state; + } + } + return NULL; +} + +struct nfs4_state * +nfs4_find_state(struct inode *inode, struct rpc_cred *cred, mode_t mode) +{ + struct nfs4_state *state; + + spin_lock(&inode->i_lock); + state = __nfs4_find_state(inode, cred, mode); + spin_unlock(&inode->i_lock); + return state; +} + +static void +nfs4_free_open_state(struct nfs4_state *state) +{ + kfree(state); +} + +struct nfs4_state * +nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) +{ + struct nfs4_state *state, *new; + struct nfs_inode *nfsi = NFS_I(inode); + + spin_lock(&inode->i_lock); + state = __nfs4_find_state_byowner(inode, owner); + spin_unlock(&inode->i_lock); + if (state) + goto out; + new = nfs4_alloc_open_state(); + spin_lock(&inode->i_lock); + state = __nfs4_find_state_byowner(inode, owner); + if (state == NULL && new != NULL) { + state = new; + /* Caller *must* be holding owner->so_sem */ + /* Note: The reclaim code dictates that we add stateless + * and read-only stateids to the end of the list */ + list_add_tail(&state->open_states, &owner->so_states); + state->owner = owner; + atomic_inc(&owner->so_count); + list_add(&state->inode_states, &nfsi->open_states); + state->inode = igrab(inode); + spin_unlock(&inode->i_lock); + } else { + spin_unlock(&inode->i_lock); + if (new) + nfs4_free_open_state(new); + } +out: + return state; +} + +/* + * Beware! Caller must be holding exactly one + * reference to clp->cl_sem and owner->so_sema! + */ +void nfs4_put_open_state(struct nfs4_state *state) +{ + struct inode *inode = state->inode; + struct nfs4_state_owner *owner = state->owner; + + if (!atomic_dec_and_lock(&state->count, &inode->i_lock)) + return; + if (!list_empty(&state->inode_states)) + list_del(&state->inode_states); + spin_unlock(&inode->i_lock); + list_del(&state->open_states); + iput(inode); + BUG_ON (state->state != 0); + nfs4_free_open_state(state); + nfs4_put_state_owner(owner); +} + +/* + * Beware! Caller must be holding no references to clp->cl_sem! + * of owner->so_sema! + */ +void nfs4_close_state(struct nfs4_state *state, mode_t mode) +{ + struct inode *inode = state->inode; + struct nfs4_state_owner *owner = state->owner; + struct nfs4_client *clp = owner->so_client; + int newstate; + + atomic_inc(&owner->so_count); + down_read(&clp->cl_sem); + down(&owner->so_sema); + /* Protect against nfs4_find_state() */ + spin_lock(&inode->i_lock); + if (mode & FMODE_READ) + state->nreaders--; + if (mode & FMODE_WRITE) + state->nwriters--; + if (state->nwriters == 0) { + if (state->nreaders == 0) + list_del_init(&state->inode_states); + /* See reclaim code */ + list_move_tail(&state->open_states, &owner->so_states); + } + spin_unlock(&inode->i_lock); + newstate = 0; + if (state->state != 0) { + if (state->nreaders) + newstate |= FMODE_READ; + if (state->nwriters) + newstate |= FMODE_WRITE; + if (state->state == newstate) + goto out; + if (nfs4_do_close(inode, state, newstate) == -EINPROGRESS) + return; + } +out: + nfs4_put_open_state(state); + up(&owner->so_sema); + nfs4_put_state_owner(owner); + up_read(&clp->cl_sem); +} + +/* + * Search the state->lock_states for an existing lock_owner + * that is compatible with current->files + */ +static struct nfs4_lock_state * +__nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) +{ + struct nfs4_lock_state *pos; + list_for_each_entry(pos, &state->lock_states, ls_locks) { + if (pos->ls_owner != fl_owner) + continue; + atomic_inc(&pos->ls_count); + return pos; + } + return NULL; +} + +struct nfs4_lock_state * +nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) +{ + struct nfs4_lock_state *lsp; + read_lock(&state->state_lock); + lsp = __nfs4_find_lock_state(state, fl_owner); + read_unlock(&state->state_lock); + return lsp; +} + +/* + * Return a compatible lock_state. If no initialized lock_state structure + * exists, return an uninitialized one. + * + * The caller must be holding state->lock_sema + */ +static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) +{ + struct nfs4_lock_state *lsp; + struct nfs4_client *clp = state->owner->so_client; + + lsp = kmalloc(sizeof(*lsp), GFP_KERNEL); + if (lsp == NULL) + return NULL; + lsp->ls_flags = 0; + lsp->ls_seqid = 0; /* arbitrary */ + lsp->ls_id = -1; + memset(lsp->ls_stateid.data, 0, sizeof(lsp->ls_stateid.data)); + atomic_set(&lsp->ls_count, 1); + lsp->ls_owner = fl_owner; + INIT_LIST_HEAD(&lsp->ls_locks); + spin_lock(&clp->cl_lock); + lsp->ls_id = nfs4_alloc_lockowner_id(clp); + spin_unlock(&clp->cl_lock); + return lsp; +} + +/* + * Return a compatible lock_state. If no initialized lock_state structure + * exists, return an uninitialized one. + * + * The caller must be holding state->lock_sema and clp->cl_sem + */ +struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner) +{ + struct nfs4_lock_state * lsp; + + lsp = nfs4_find_lock_state(state, owner); + if (lsp == NULL) + lsp = nfs4_alloc_lock_state(state, owner); + return lsp; +} + +/* + * Byte-range lock aware utility to initialize the stateid of read/write + * requests. + */ +void +nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner) +{ + if (test_bit(LK_STATE_IN_USE, &state->flags)) { + struct nfs4_lock_state *lsp; + + lsp = nfs4_find_lock_state(state, fl_owner); + if (lsp) { + memcpy(dst, &lsp->ls_stateid, sizeof(*dst)); + nfs4_put_lock_state(lsp); + return; + } + } + memcpy(dst, &state->stateid, sizeof(*dst)); +} + +/* +* Called with state->lock_sema and clp->cl_sem held. +*/ +void nfs4_increment_lock_seqid(int status, struct nfs4_lock_state *lsp) +{ + if (status == NFS_OK || seqid_mutating_err(-status)) + lsp->ls_seqid++; +} + +/* +* Check to see if the request lock (type FL_UNLK) effects the fl lock. +* +* fl and request must have the same posix owner +* +* return: +* 0 -> fl not effected by request +* 1 -> fl consumed by request +*/ + +static int +nfs4_check_unlock(struct file_lock *fl, struct file_lock *request) +{ + if (fl->fl_start >= request->fl_start && fl->fl_end <= request->fl_end) + return 1; + return 0; +} + +/* + * Post an initialized lock_state on the state->lock_states list. + */ +void nfs4_notify_setlk(struct nfs4_state *state, struct file_lock *request, struct nfs4_lock_state *lsp) +{ + if (!list_empty(&lsp->ls_locks)) + return; + atomic_inc(&lsp->ls_count); + write_lock(&state->state_lock); + list_add(&lsp->ls_locks, &state->lock_states); + set_bit(LK_STATE_IN_USE, &state->flags); + write_unlock(&state->state_lock); +} + +/* + * to decide to 'reap' lock state: + * 1) search i_flock for file_locks with fl.lock_state = to ls. + * 2) determine if unlock will consume found lock. + * if so, reap + * + * else, don't reap. + * + */ +void +nfs4_notify_unlck(struct nfs4_state *state, struct file_lock *request, struct nfs4_lock_state *lsp) +{ + struct inode *inode = state->inode; + struct file_lock *fl; + + for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { + if (!(fl->fl_flags & FL_POSIX)) + continue; + if (fl->fl_owner != lsp->ls_owner) + continue; + /* Exit if we find at least one lock which is not consumed */ + if (nfs4_check_unlock(fl,request) == 0) + return; + } + + write_lock(&state->state_lock); + list_del_init(&lsp->ls_locks); + if (list_empty(&state->lock_states)) + clear_bit(LK_STATE_IN_USE, &state->flags); + write_unlock(&state->state_lock); + nfs4_put_lock_state(lsp); +} + +/* + * Release reference to lock_state, and free it if we see that + * it is no longer in use + */ +void +nfs4_put_lock_state(struct nfs4_lock_state *lsp) +{ + if (!atomic_dec_and_test(&lsp->ls_count)) + return; + BUG_ON (!list_empty(&lsp->ls_locks)); + kfree(lsp); +} + +/* +* Called with sp->so_sema and clp->cl_sem held. +* +* Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or +* failed with a seqid incrementing error - +* see comments nfs_fs.h:seqid_mutating_error() +*/ +void nfs4_increment_seqid(int status, struct nfs4_state_owner *sp) +{ + if (status == NFS_OK || seqid_mutating_err(-status)) + sp->so_seqid++; + /* If the server returns BAD_SEQID, unhash state_owner here */ + if (status == -NFS4ERR_BAD_SEQID) + nfs4_drop_state_owner(sp); +} + +static int reclaimer(void *); +struct reclaimer_args { + struct nfs4_client *clp; + struct completion complete; +}; + +/* + * State recovery routine + */ +void +nfs4_recover_state(void *data) +{ + struct nfs4_client *clp = (struct nfs4_client *)data; + struct reclaimer_args args = { + .clp = clp, + }; + might_sleep(); + + init_completion(&args.complete); + + if (kernel_thread(reclaimer, &args, CLONE_KERNEL) < 0) + goto out_failed_clear; + wait_for_completion(&args.complete); + return; +out_failed_clear: + set_bit(NFS4CLNT_OK, &clp->cl_state); + wake_up_all(&clp->cl_waitq); + rpc_wake_up(&clp->cl_rpcwaitq); +} + +/* + * Schedule a state recovery attempt + */ +void +nfs4_schedule_state_recovery(struct nfs4_client *clp) +{ + if (!clp) + return; + if (test_and_clear_bit(NFS4CLNT_OK, &clp->cl_state)) + schedule_work(&clp->cl_recoverd); +} + +static int nfs4_reclaim_locks(struct nfs4_state_recovery_ops *ops, struct nfs4_state *state) +{ + struct inode *inode = state->inode; + struct file_lock *fl; + int status = 0; + + for (fl = inode->i_flock; fl != 0; fl = fl->fl_next) { + if (!(fl->fl_flags & FL_POSIX)) + continue; + if (((struct nfs_open_context *)fl->fl_file->private_data)->state != state) + continue; + status = ops->recover_lock(state, fl); + if (status >= 0) + continue; + switch (status) { + default: + printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", + __FUNCTION__, status); + case -NFS4ERR_EXPIRED: + case -NFS4ERR_NO_GRACE: + case -NFS4ERR_RECLAIM_BAD: + case -NFS4ERR_RECLAIM_CONFLICT: + /* kill_proc(fl->fl_owner, SIGLOST, 1); */ + break; + case -NFS4ERR_STALE_CLIENTID: + goto out_err; + } + } + return 0; +out_err: + return status; +} + +static int nfs4_reclaim_open_state(struct nfs4_state_recovery_ops *ops, struct nfs4_state_owner *sp) +{ + struct nfs4_state *state; + struct nfs4_lock_state *lock; + int status = 0; + + /* Note: we rely on the sp->so_states list being ordered + * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) + * states first. + * This is needed to ensure that the server won't give us any + * read delegations that we have to return if, say, we are + * recovering after a network partition or a reboot from a + * server that doesn't support a grace period. + */ + list_for_each_entry(state, &sp->so_states, open_states) { + if (state->state == 0) + continue; + status = ops->recover_open(sp, state); + list_for_each_entry(lock, &state->lock_states, ls_locks) + lock->ls_flags &= ~NFS_LOCK_INITIALIZED; + if (status >= 0) { + status = nfs4_reclaim_locks(ops, state); + if (status < 0) + goto out_err; + list_for_each_entry(lock, &state->lock_states, ls_locks) { + if (!(lock->ls_flags & NFS_LOCK_INITIALIZED)) + printk("%s: Lock reclaim failed!\n", + __FUNCTION__); + } + continue; + } + switch (status) { + default: + printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", + __FUNCTION__, status); + case -ENOENT: + case -NFS4ERR_RECLAIM_BAD: + case -NFS4ERR_RECLAIM_CONFLICT: + /* + * Open state on this file cannot be recovered + * All we can do is revert to using the zero stateid. + */ + memset(state->stateid.data, 0, + sizeof(state->stateid.data)); + /* Mark the file as being 'closed' */ + state->state = 0; + break; + case -NFS4ERR_EXPIRED: + case -NFS4ERR_NO_GRACE: + case -NFS4ERR_STALE_CLIENTID: + goto out_err; + } + } + return 0; +out_err: + return status; +} + +static int reclaimer(void *ptr) +{ + struct reclaimer_args *args = (struct reclaimer_args *)ptr; + struct nfs4_client *clp = args->clp; + struct nfs4_state_owner *sp; + struct nfs4_state_recovery_ops *ops; + int status = 0; + + daemonize("%u.%u.%u.%u-reclaim", NIPQUAD(clp->cl_addr)); + allow_signal(SIGKILL); + + atomic_inc(&clp->cl_count); + complete(&args->complete); + + /* Ensure exclusive access to NFSv4 state */ + lock_kernel(); + down_write(&clp->cl_sem); + /* Are there any NFS mounts out there? */ + if (list_empty(&clp->cl_superblocks)) + goto out; +restart_loop: + status = nfs4_proc_renew(clp); + switch (status) { + case 0: + case -NFS4ERR_CB_PATH_DOWN: + goto out; + case -NFS4ERR_STALE_CLIENTID: + case -NFS4ERR_LEASE_MOVED: + ops = &nfs4_reboot_recovery_ops; + break; + default: + ops = &nfs4_network_partition_recovery_ops; + }; + status = __nfs4_init_client(clp); + if (status) + goto out_error; + /* Mark all delegations for reclaim */ + nfs_delegation_mark_reclaim(clp); + /* Note: list is protected by exclusive lock on cl->cl_sem */ + list_for_each_entry(sp, &clp->cl_state_owners, so_list) { + status = nfs4_reclaim_open_state(ops, sp); + if (status < 0) { + if (status == -NFS4ERR_NO_GRACE) { + ops = &nfs4_network_partition_recovery_ops; + status = nfs4_reclaim_open_state(ops, sp); + } + if (status == -NFS4ERR_STALE_CLIENTID) + goto restart_loop; + if (status == -NFS4ERR_EXPIRED) + goto restart_loop; + } + } + nfs_delegation_reap_unclaimed(clp); +out: + set_bit(NFS4CLNT_OK, &clp->cl_state); + up_write(&clp->cl_sem); + unlock_kernel(); + wake_up_all(&clp->cl_waitq); + rpc_wake_up(&clp->cl_rpcwaitq); + if (status == -NFS4ERR_CB_PATH_DOWN) + nfs_handle_cb_pathdown(clp); + nfs4_put_client(clp); + return 0; +out_error: + printk(KERN_WARNING "Error: state recovery failed on NFSv4 server %u.%u.%u.%u with error %d\n", + NIPQUAD(clp->cl_addr.s_addr), -status); + goto out; +} + +/* + * Local variables: + * c-basic-offset: 8 + * End: + */ |