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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/nfs/nfs4proc.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'fs/nfs/nfs4proc.c')
-rw-r--r--fs/nfs/nfs4proc.c2786
1 files changed, 2786 insertions, 0 deletions
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
new file mode 100644
index 000000000000..1d5cb3e80c3e
--- /dev/null
+++ b/fs/nfs/nfs4proc.c
@@ -0,0 +1,2786 @@
+/*
+ * fs/nfs/nfs4proc.c
+ *
+ * Client-side procedure declarations for NFSv4.
+ *
+ * Copyright (c) 2002 The Regents of the University of Michigan.
+ * All rights reserved.
+ *
+ * Kendrick Smith <kmsmith@umich.edu>
+ * Andy Adamson <andros@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.
+ */
+
+#include <linux/mm.h>
+#include <linux/utsname.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/nfs.h>
+#include <linux/nfs4.h>
+#include <linux/nfs_fs.h>
+#include <linux/nfs_page.h>
+#include <linux/smp_lock.h>
+#include <linux/namei.h>
+
+#include "delegation.h"
+
+#define NFSDBG_FACILITY NFSDBG_PROC
+
+#define NFS4_POLL_RETRY_MIN (1*HZ)
+#define NFS4_POLL_RETRY_MAX (15*HZ)
+
+static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
+static int nfs4_async_handle_error(struct rpc_task *, struct nfs_server *);
+static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
+static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
+extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus);
+extern struct rpc_procinfo nfs4_procedures[];
+
+extern nfs4_stateid zero_stateid;
+
+/* Prevent leaks of NFSv4 errors into userland */
+int nfs4_map_errors(int err)
+{
+ if (err < -1000) {
+ dprintk("%s could not handle NFSv4 error %d\n",
+ __FUNCTION__, -err);
+ return -EIO;
+ }
+ return err;
+}
+
+/*
+ * This is our standard bitmap for GETATTR requests.
+ */
+const u32 nfs4_fattr_bitmap[2] = {
+ FATTR4_WORD0_TYPE
+ | FATTR4_WORD0_CHANGE
+ | FATTR4_WORD0_SIZE
+ | FATTR4_WORD0_FSID
+ | FATTR4_WORD0_FILEID,
+ FATTR4_WORD1_MODE
+ | FATTR4_WORD1_NUMLINKS
+ | FATTR4_WORD1_OWNER
+ | FATTR4_WORD1_OWNER_GROUP
+ | FATTR4_WORD1_RAWDEV
+ | FATTR4_WORD1_SPACE_USED
+ | FATTR4_WORD1_TIME_ACCESS
+ | FATTR4_WORD1_TIME_METADATA
+ | FATTR4_WORD1_TIME_MODIFY
+};
+
+const u32 nfs4_statfs_bitmap[2] = {
+ FATTR4_WORD0_FILES_AVAIL
+ | FATTR4_WORD0_FILES_FREE
+ | FATTR4_WORD0_FILES_TOTAL,
+ FATTR4_WORD1_SPACE_AVAIL
+ | FATTR4_WORD1_SPACE_FREE
+ | FATTR4_WORD1_SPACE_TOTAL
+};
+
+u32 nfs4_pathconf_bitmap[2] = {
+ FATTR4_WORD0_MAXLINK
+ | FATTR4_WORD0_MAXNAME,
+ 0
+};
+
+const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
+ | FATTR4_WORD0_MAXREAD
+ | FATTR4_WORD0_MAXWRITE
+ | FATTR4_WORD0_LEASE_TIME,
+ 0
+};
+
+static void nfs4_setup_readdir(u64 cookie, u32 *verifier, struct dentry *dentry,
+ struct nfs4_readdir_arg *readdir)
+{
+ u32 *start, *p;
+
+ BUG_ON(readdir->count < 80);
+ if (cookie > 2) {
+ readdir->cookie = (cookie > 2) ? cookie : 0;
+ memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
+ return;
+ }
+
+ readdir->cookie = 0;
+ memset(&readdir->verifier, 0, sizeof(readdir->verifier));
+ if (cookie == 2)
+ return;
+
+ /*
+ * NFSv4 servers do not return entries for '.' and '..'
+ * Therefore, we fake these entries here. We let '.'
+ * have cookie 0 and '..' have cookie 1. Note that
+ * when talking to the server, we always send cookie 0
+ * instead of 1 or 2.
+ */
+ start = p = (u32 *)kmap_atomic(*readdir->pages, KM_USER0);
+
+ if (cookie == 0) {
+ *p++ = xdr_one; /* next */
+ *p++ = xdr_zero; /* cookie, first word */
+ *p++ = xdr_one; /* cookie, second word */
+ *p++ = xdr_one; /* entry len */
+ memcpy(p, ".\0\0\0", 4); /* entry */
+ p++;
+ *p++ = xdr_one; /* bitmap length */
+ *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
+ *p++ = htonl(8); /* attribute buffer length */
+ p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
+ }
+
+ *p++ = xdr_one; /* next */
+ *p++ = xdr_zero; /* cookie, first word */
+ *p++ = xdr_two; /* cookie, second word */
+ *p++ = xdr_two; /* entry len */
+ memcpy(p, "..\0\0", 4); /* entry */
+ p++;
+ *p++ = xdr_one; /* bitmap length */
+ *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */
+ *p++ = htonl(8); /* attribute buffer length */
+ p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
+
+ readdir->pgbase = (char *)p - (char *)start;
+ readdir->count -= readdir->pgbase;
+ kunmap_atomic(start, KM_USER0);
+}
+
+static void
+renew_lease(struct nfs_server *server, unsigned long timestamp)
+{
+ struct nfs4_client *clp = server->nfs4_state;
+ spin_lock(&clp->cl_lock);
+ if (time_before(clp->cl_last_renewal,timestamp))
+ clp->cl_last_renewal = timestamp;
+ spin_unlock(&clp->cl_lock);
+}
+
+static void update_changeattr(struct inode *inode, struct nfs4_change_info *cinfo)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+
+ if (cinfo->before == nfsi->change_attr && cinfo->atomic)
+ nfsi->change_attr = cinfo->after;
+}
+
+static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
+{
+ struct inode *inode = state->inode;
+
+ open_flags &= (FMODE_READ|FMODE_WRITE);
+ /* Protect against nfs4_find_state() */
+ spin_lock(&inode->i_lock);
+ state->state |= open_flags;
+ /* NB! List reordering - see the reclaim code for why. */
+ if ((open_flags & FMODE_WRITE) && 0 == state->nwriters++)
+ list_move(&state->open_states, &state->owner->so_states);
+ if (open_flags & FMODE_READ)
+ state->nreaders++;
+ memcpy(&state->stateid, stateid, sizeof(state->stateid));
+ spin_unlock(&inode->i_lock);
+}
+
+/*
+ * OPEN_RECLAIM:
+ * reclaim state on the server after a reboot.
+ * Assumes caller is holding the sp->so_sem
+ */
+static int _nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
+{
+ struct inode *inode = state->inode;
+ struct nfs_server *server = NFS_SERVER(inode);
+ struct nfs_delegation *delegation = NFS_I(inode)->delegation;
+ struct nfs_openargs o_arg = {
+ .fh = NFS_FH(inode),
+ .seqid = sp->so_seqid,
+ .id = sp->so_id,
+ .open_flags = state->state,
+ .clientid = server->nfs4_state->cl_clientid,
+ .claim = NFS4_OPEN_CLAIM_PREVIOUS,
+ .bitmask = server->attr_bitmask,
+ };
+ struct nfs_openres o_res = {
+ .server = server, /* Grrr */
+ };
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
+ .rpc_argp = &o_arg,
+ .rpc_resp = &o_res,
+ .rpc_cred = sp->so_cred,
+ };
+ int status;
+
+ if (delegation != NULL) {
+ if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
+ memcpy(&state->stateid, &delegation->stateid,
+ sizeof(state->stateid));
+ set_bit(NFS_DELEGATED_STATE, &state->flags);
+ return 0;
+ }
+ o_arg.u.delegation_type = delegation->type;
+ }
+ status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
+ nfs4_increment_seqid(status, sp);
+ if (status == 0) {
+ memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
+ if (o_res.delegation_type != 0) {
+ nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
+ /* Did the server issue an immediate delegation recall? */
+ if (o_res.do_recall)
+ nfs_async_inode_return_delegation(inode, &o_res.stateid);
+ }
+ }
+ clear_bit(NFS_DELEGATED_STATE, &state->flags);
+ /* Ensure we update the inode attributes */
+ NFS_CACHEINV(inode);
+ return status;
+}
+
+static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
+{
+ struct nfs_server *server = NFS_SERVER(state->inode);
+ struct nfs4_exception exception = { };
+ int err;
+ do {
+ err = _nfs4_open_reclaim(sp, state);
+ switch (err) {
+ case 0:
+ case -NFS4ERR_STALE_CLIENTID:
+ case -NFS4ERR_STALE_STATEID:
+ case -NFS4ERR_EXPIRED:
+ return err;
+ }
+ err = nfs4_handle_exception(server, err, &exception);
+ } while (exception.retry);
+ return err;
+}
+
+static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
+{
+ struct nfs4_state_owner *sp = state->owner;
+ struct inode *inode = dentry->d_inode;
+ struct nfs_server *server = NFS_SERVER(inode);
+ struct dentry *parent = dget_parent(dentry);
+ struct nfs_openargs arg = {
+ .fh = NFS_FH(parent->d_inode),
+ .clientid = server->nfs4_state->cl_clientid,
+ .name = &dentry->d_name,
+ .id = sp->so_id,
+ .server = server,
+ .bitmask = server->attr_bitmask,
+ .claim = NFS4_OPEN_CLAIM_DELEGATE_CUR,
+ };
+ struct nfs_openres res = {
+ .server = server,
+ };
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
+ .rpc_argp = &arg,
+ .rpc_resp = &res,
+ .rpc_cred = sp->so_cred,
+ };
+ int status = 0;
+
+ down(&sp->so_sema);
+ if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
+ goto out;
+ if (state->state == 0)
+ goto out;
+ arg.seqid = sp->so_seqid;
+ arg.open_flags = state->state;
+ memcpy(arg.u.delegation.data, state->stateid.data, sizeof(arg.u.delegation.data));
+ status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
+ nfs4_increment_seqid(status, sp);
+ if (status >= 0) {
+ memcpy(state->stateid.data, res.stateid.data,
+ sizeof(state->stateid.data));
+ clear_bit(NFS_DELEGATED_STATE, &state->flags);
+ }
+out:
+ up(&sp->so_sema);
+ dput(parent);
+ return status;
+}
+
+int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
+{
+ struct nfs4_exception exception = { };
+ struct nfs_server *server = NFS_SERVER(dentry->d_inode);
+ int err;
+ do {
+ err = _nfs4_open_delegation_recall(dentry, state);
+ switch (err) {
+ case 0:
+ return err;
+ case -NFS4ERR_STALE_CLIENTID:
+ case -NFS4ERR_STALE_STATEID:
+ case -NFS4ERR_EXPIRED:
+ /* Don't recall a delegation if it was lost */
+ nfs4_schedule_state_recovery(server->nfs4_state);
+ return err;
+ }
+ err = nfs4_handle_exception(server, err, &exception);
+ } while (exception.retry);
+ return err;
+}
+
+static inline int _nfs4_proc_open_confirm(struct rpc_clnt *clnt, const struct nfs_fh *fh, struct nfs4_state_owner *sp, nfs4_stateid *stateid)
+{
+ struct nfs_open_confirmargs arg = {
+ .fh = fh,
+ .seqid = sp->so_seqid,
+ .stateid = *stateid,
+ };
+ struct nfs_open_confirmres res;
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
+ .rpc_argp = &arg,
+ .rpc_resp = &res,
+ .rpc_cred = sp->so_cred,
+ };
+ int status;
+
+ status = rpc_call_sync(clnt, &msg, RPC_TASK_NOINTR);
+ nfs4_increment_seqid(status, sp);
+ if (status >= 0)
+ memcpy(stateid, &res.stateid, sizeof(*stateid));
+ return status;
+}
+
+static int _nfs4_proc_open(struct inode *dir, struct nfs4_state_owner *sp, struct nfs_openargs *o_arg, struct nfs_openres *o_res)
+{
+ struct nfs_server *server = NFS_SERVER(dir);
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
+ .rpc_argp = o_arg,
+ .rpc_resp = o_res,
+ .rpc_cred = sp->so_cred,
+ };
+ int status;
+
+ /* Update sequence id. The caller must serialize! */
+ o_arg->seqid = sp->so_seqid;
+ o_arg->id = sp->so_id;
+ o_arg->clientid = sp->so_client->cl_clientid;
+
+ status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
+ nfs4_increment_seqid(status, sp);
+ if (status != 0)
+ goto out;
+ update_changeattr(dir, &o_res->cinfo);
+ if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
+ status = _nfs4_proc_open_confirm(server->client, &o_res->fh,
+ sp, &o_res->stateid);
+ if (status != 0)
+ goto out;
+ }
+ if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
+ status = server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
+out:
+ return status;
+}
+
+static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
+{
+ struct nfs_access_entry cache;
+ int mask = 0;
+ int status;
+
+ if (openflags & FMODE_READ)
+ mask |= MAY_READ;
+ if (openflags & FMODE_WRITE)
+ mask |= MAY_WRITE;
+ status = nfs_access_get_cached(inode, cred, &cache);
+ if (status == 0)
+ goto out;
+
+ /* Be clever: ask server to check for all possible rights */
+ cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
+ cache.cred = cred;
+ cache.jiffies = jiffies;
+ status = _nfs4_proc_access(inode, &cache);
+ if (status != 0)
+ return status;
+ nfs_access_add_cache(inode, &cache);
+out:
+ if ((cache.mask & mask) == mask)
+ return 0;
+ return -EACCES;
+}
+
+/*
+ * OPEN_EXPIRED:
+ * reclaim state on the server after a network partition.
+ * Assumes caller holds the appropriate lock
+ */
+static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
+{
+ struct dentry *parent = dget_parent(dentry);
+ struct inode *dir = parent->d_inode;
+ struct inode *inode = state->inode;
+ struct nfs_server *server = NFS_SERVER(dir);
+ struct nfs_delegation *delegation = NFS_I(inode)->delegation;
+ struct nfs_fattr f_attr = {
+ .valid = 0,
+ };
+ struct nfs_openargs o_arg = {
+ .fh = NFS_FH(dir),
+ .open_flags = state->state,
+ .name = &dentry->d_name,
+ .bitmask = server->attr_bitmask,
+ .claim = NFS4_OPEN_CLAIM_NULL,
+ };
+ struct nfs_openres o_res = {
+ .f_attr = &f_attr,
+ .server = server,
+ };
+ int status = 0;
+
+ if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
+ status = _nfs4_do_access(inode, sp->so_cred, state->state);
+ if (status < 0)
+ goto out;
+ memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
+ set_bit(NFS_DELEGATED_STATE, &state->flags);
+ goto out;
+ }
+ status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
+ if (status != 0)
+ goto out_nodeleg;
+ /* Check if files differ */
+ if ((f_attr.mode & S_IFMT) != (inode->i_mode & S_IFMT))
+ goto out_stale;
+ /* Has the file handle changed? */
+ if (nfs_compare_fh(&o_res.fh, NFS_FH(inode)) != 0) {
+ /* Verify if the change attributes are the same */
+ if (f_attr.change_attr != NFS_I(inode)->change_attr)
+ goto out_stale;
+ if (nfs_size_to_loff_t(f_attr.size) != inode->i_size)
+ goto out_stale;
+ /* Lets just pretend that this is the same file */
+ nfs_copy_fh(NFS_FH(inode), &o_res.fh);
+ NFS_I(inode)->fileid = f_attr.fileid;
+ }
+ memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
+ if (o_res.delegation_type != 0) {
+ if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM))
+ nfs_inode_set_delegation(inode, sp->so_cred, &o_res);
+ else
+ nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
+ }
+out_nodeleg:
+ clear_bit(NFS_DELEGATED_STATE, &state->flags);
+out:
+ dput(parent);
+ return status;
+out_stale:
+ status = -ESTALE;
+ /* Invalidate the state owner so we don't ever use it again */
+ nfs4_drop_state_owner(sp);
+ d_drop(dentry);
+ /* Should we be trying to close that stateid? */
+ goto out_nodeleg;
+}
+
+static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
+{
+ struct nfs_inode *nfsi = NFS_I(state->inode);
+ struct nfs_open_context *ctx;
+ int status;
+
+ spin_lock(&state->inode->i_lock);
+ list_for_each_entry(ctx, &nfsi->open_files, list) {
+ if (ctx->state != state)
+ continue;
+ get_nfs_open_context(ctx);
+ spin_unlock(&state->inode->i_lock);
+ status = _nfs4_open_expired(sp, state, ctx->dentry);
+ put_nfs_open_context(ctx);
+ return status;
+ }
+ spin_unlock(&state->inode->i_lock);
+ return -ENOENT;
+}
+
+/*
+ * Returns an nfs4_state + an extra reference to the inode
+ */
+static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
+{
+ struct nfs_delegation *delegation;
+ struct nfs_server *server = NFS_SERVER(inode);
+ struct nfs4_client *clp = server->nfs4_state;
+ struct nfs_inode *nfsi = NFS_I(inode);
+ struct nfs4_state_owner *sp = NULL;
+ struct nfs4_state *state = NULL;
+ int open_flags = flags & (FMODE_READ|FMODE_WRITE);
+ int err;
+
+ /* Protect against reboot recovery - NOTE ORDER! */
+ down_read(&clp->cl_sem);
+ /* Protect against delegation recall */
+ down_read(&nfsi->rwsem);
+ delegation = NFS_I(inode)->delegation;
+ err = -ENOENT;
+ if (delegation == NULL || (delegation->type & open_flags) != open_flags)
+ goto out_err;
+ err = -ENOMEM;
+ if (!(sp = nfs4_get_state_owner(server, cred))) {
+ dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
+ goto out_err;
+ }
+ down(&sp->so_sema);
+ state = nfs4_get_open_state(inode, sp);
+ if (state == NULL)
+ goto out_err;
+
+ 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++;
+ spin_unlock(&inode->i_lock);
+ goto out_ok;
+ } else if (state->state != 0)
+ goto out_err;
+
+ lock_kernel();
+ err = _nfs4_do_access(inode, cred, open_flags);
+ unlock_kernel();
+ if (err != 0)
+ goto out_err;
+ set_bit(NFS_DELEGATED_STATE, &state->flags);
+ update_open_stateid(state, &delegation->stateid, open_flags);
+out_ok:
+ up(&sp->so_sema);
+ nfs4_put_state_owner(sp);
+ up_read(&nfsi->rwsem);
+ up_read(&clp->cl_sem);
+ igrab(inode);
+ *res = state;
+ return 0;
+out_err:
+ if (sp != NULL) {
+ if (state != NULL)
+ nfs4_put_open_state(state);
+ up(&sp->so_sema);
+ nfs4_put_state_owner(sp);
+ }
+ up_read(&nfsi->rwsem);
+ up_read(&clp->cl_sem);
+ return err;
+}
+
+static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
+{
+ struct nfs4_exception exception = { };
+ struct nfs4_state *res;
+ int err;
+
+ do {
+ err = _nfs4_open_delegated(inode, flags, cred, &res);
+ if (err == 0)
+ break;
+ res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
+ err, &exception));
+ } while (exception.retry);
+ return res;
+}
+
+/*
+ * Returns an nfs4_state + an referenced inode
+ */
+static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
+{
+ struct nfs4_state_owner *sp;
+ struct nfs4_state *state = NULL;
+ struct nfs_server *server = NFS_SERVER(dir);
+ struct nfs4_client *clp = server->nfs4_state;
+ struct inode *inode = NULL;
+ int status;
+ struct nfs_fattr f_attr = {
+ .valid = 0,
+ };
+ struct nfs_openargs o_arg = {
+ .fh = NFS_FH(dir),
+ .open_flags = flags,
+ .name = &dentry->d_name,
+ .server = server,
+ .bitmask = server->attr_bitmask,
+ .claim = NFS4_OPEN_CLAIM_NULL,
+ };
+ struct nfs_openres o_res = {
+ .f_attr = &f_attr,
+ .server = server,
+ };
+
+ /* Protect against reboot recovery conflicts */
+ down_read(&clp->cl_sem);
+ status = -ENOMEM;
+ if (!(sp = nfs4_get_state_owner(server, cred))) {
+ dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
+ goto out_err;
+ }
+ if (flags & O_EXCL) {
+ u32 *p = (u32 *) o_arg.u.verifier.data;
+ p[0] = jiffies;
+ p[1] = current->pid;
+ } else
+ o_arg.u.attrs = sattr;
+ /* Serialization for the sequence id */
+ down(&sp->so_sema);
+
+ status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
+ if (status != 0)
+ goto out_err;
+
+ status = -ENOMEM;
+ inode = nfs_fhget(dir->i_sb, &o_res.fh, &f_attr);
+ if (!inode)
+ goto out_err;
+ state = nfs4_get_open_state(inode, sp);
+ if (!state)
+ goto out_err;
+ update_open_stateid(state, &o_res.stateid, flags);
+ if (o_res.delegation_type != 0)
+ nfs_inode_set_delegation(inode, cred, &o_res);
+ up(&sp->so_sema);
+ nfs4_put_state_owner(sp);
+ up_read(&clp->cl_sem);
+ *res = state;
+ return 0;
+out_err:
+ if (sp != NULL) {
+ if (state != NULL)
+ nfs4_put_open_state(state);
+ up(&sp->so_sema);
+ nfs4_put_state_owner(sp);
+ }
+ /* Note: clp->cl_sem must be released before nfs4_put_open_state()! */
+ up_read(&clp->cl_sem);
+ if (inode != NULL)
+ iput(inode);
+ *res = NULL;
+ return status;
+}
+
+
+static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
+{
+ struct nfs4_exception exception = { };
+ struct nfs4_state *res;
+ int status;
+
+ do {
+ status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
+ if (status == 0)
+ break;
+ /* NOTE: BAD_SEQID means the server and client disagree about the
+ * book-keeping w.r.t. state-changing operations
+ * (OPEN/CLOSE/LOCK/LOCKU...)
+ * It is actually a sign of a bug on the client or on the server.
+ *
+ * If we receive a BAD_SEQID error in the particular case of
+ * doing an OPEN, we assume that nfs4_increment_seqid() will
+ * have unhashed the old state_owner for us, and that we can
+ * therefore safely retry using a new one. We should still warn
+ * the user though...
+ */
+ if (status == -NFS4ERR_BAD_SEQID) {
+ printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
+ exception.retry = 1;
+ continue;
+ }
+ res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
+ status, &exception));
+ } while (exception.retry);
+ return res;
+}
+
+static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
+ struct nfs_fh *fhandle, struct iattr *sattr,
+ struct nfs4_state *state)
+{
+ struct nfs_setattrargs arg = {
+ .fh = fhandle,
+ .iap = sattr,
+ .server = server,
+ .bitmask = server->attr_bitmask,
+ };
+ struct nfs_setattrres res = {
+ .fattr = fattr,
+ .server = server,
+ };
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
+ .rpc_argp = &arg,
+ .rpc_resp = &res,
+ };
+
+ fattr->valid = 0;
+
+ if (state != NULL)
+ msg.rpc_cred = state->owner->so_cred;
+ if (sattr->ia_valid & ATTR_SIZE)
+ nfs4_copy_stateid(&arg.stateid, state, NULL);
+ else
+ memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
+
+ return rpc_call_sync(server->client, &msg, 0);
+}
+
+static int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
+ struct nfs_fh *fhandle, struct iattr *sattr,
+ struct nfs4_state *state)
+{
+ struct nfs4_exception exception = { };
+ int err;
+ do {
+ err = nfs4_handle_exception(server,
+ _nfs4_do_setattr(server, fattr, fhandle, sattr,
+ state),
+ &exception);
+ } while (exception.retry);
+ return err;
+}
+
+struct nfs4_closedata {
+ struct inode *inode;
+ struct nfs4_state *state;
+ struct nfs_closeargs arg;
+ struct nfs_closeres res;
+};
+
+static void nfs4_close_done(struct rpc_task *task)
+{
+ struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata;
+ struct nfs4_state *state = calldata->state;
+ struct nfs4_state_owner *sp = state->owner;
+ struct nfs_server *server = NFS_SERVER(calldata->inode);
+
+ /* hmm. we are done with the inode, and in the process of freeing
+ * the state_owner. we keep this around to process errors
+ */
+ nfs4_increment_seqid(task->tk_status, sp);
+ switch (task->tk_status) {
+ case 0:
+ memcpy(&state->stateid, &calldata->res.stateid,
+ sizeof(state->stateid));
+ break;
+ case -NFS4ERR_STALE_STATEID:
+ case -NFS4ERR_EXPIRED:
+ state->state = calldata->arg.open_flags;
+ nfs4_schedule_state_recovery(server->nfs4_state);
+ break;
+ default:
+ if (nfs4_async_handle_error(task, server) == -EAGAIN) {
+ rpc_restart_call(task);
+ return;
+ }
+ }
+ state->state = calldata->arg.open_flags;
+ nfs4_put_open_state(state);
+ up(&sp->so_sema);
+ nfs4_put_state_owner(sp);
+ up_read(&server->nfs4_state->cl_sem);
+ kfree(calldata);
+}
+
+static inline int nfs4_close_call(struct rpc_clnt *clnt, struct nfs4_closedata *calldata)
+{
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
+ .rpc_argp = &calldata->arg,
+ .rpc_resp = &calldata->res,
+ .rpc_cred = calldata->state->owner->so_cred,
+ };
+ if (calldata->arg.open_flags != 0)
+ msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
+ return rpc_call_async(clnt, &msg, 0, nfs4_close_done, calldata);
+}
+
+/*
+ * It is possible for data to be read/written from a mem-mapped file
+ * after the sys_close call (which hits the vfs layer as a flush).
+ * This means that we can't safely call nfsv4 close on a file until
+ * the inode is cleared. This in turn means that we are not good
+ * NFSv4 citizens - we do not indicate to the server to update the file's
+ * share state even when we are done with one of the three share
+ * stateid's in the inode.
+ *
+ * NOTE: Caller must be holding the sp->so_owner semaphore!
+ */
+int nfs4_do_close(struct inode *inode, struct nfs4_state *state, mode_t mode)
+{
+ struct nfs4_closedata *calldata;
+ int status;
+
+ /* Tell caller we're done */
+ if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
+ state->state = mode;
+ return 0;
+ }
+ calldata = (struct nfs4_closedata *)kmalloc(sizeof(*calldata), GFP_KERNEL);
+ if (calldata == NULL)
+ return -ENOMEM;
+ calldata->inode = inode;
+ calldata->state = state;
+ calldata->arg.fh = NFS_FH(inode);
+ /* Serialization for the sequence id */
+ calldata->arg.seqid = state->owner->so_seqid;
+ calldata->arg.open_flags = mode;
+ memcpy(&calldata->arg.stateid, &state->stateid,
+ sizeof(calldata->arg.stateid));
+ status = nfs4_close_call(NFS_SERVER(inode)->client, calldata);
+ /*
+ * Return -EINPROGRESS on success in order to indicate to the
+ * caller that an asynchronous RPC call has been launched, and
+ * that it will release the semaphores on completion.
+ */
+ return (status == 0) ? -EINPROGRESS : status;
+}
+
+struct inode *
+nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
+{
+ struct iattr attr;
+ struct rpc_cred *cred;
+ struct nfs4_state *state;
+
+ if (nd->flags & LOOKUP_CREATE) {
+ attr.ia_mode = nd->intent.open.create_mode;
+ attr.ia_valid = ATTR_MODE;
+ if (!IS_POSIXACL(dir))
+ attr.ia_mode &= ~current->fs->umask;
+ } else {
+ attr.ia_valid = 0;
+ BUG_ON(nd->intent.open.flags & O_CREAT);
+ }
+
+ cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
+ if (IS_ERR(cred))
+ return (struct inode *)cred;
+ state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
+ put_rpccred(cred);
+ if (IS_ERR(state))
+ return (struct inode *)state;
+ return state->inode;
+}
+
+int
+nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags)
+{
+ struct rpc_cred *cred;
+ struct nfs4_state *state;
+ struct inode *inode;
+
+ cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
+ if (IS_ERR(cred))
+ return PTR_ERR(cred);
+ state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
+ if (IS_ERR(state))
+ state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
+ put_rpccred(cred);
+ if (state == ERR_PTR(-ENOENT) && dentry->d_inode == 0)
+ return 1;
+ if (IS_ERR(state))
+ return 0;
+ inode = state->inode;
+ if (inode == dentry->d_inode) {
+ iput(inode);
+ return 1;
+ }
+ d_drop(dentry);
+ nfs4_close_state(state, openflags);
+ iput(inode);
+ return 0;
+}
+
+
+static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
+{
+ struct nfs4_server_caps_res res = {};
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
+ .rpc_argp = fhandle,
+ .rpc_resp = &res,
+ };
+ int status;
+
+ status = rpc_call_sync(server->client, &msg, 0);
+ if (status == 0) {
+ memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
+ if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
+ server->caps |= NFS_CAP_ACLS;
+ if (res.has_links != 0)
+ server->caps |= NFS_CAP_HARDLINKS;
+ if (res.has_symlinks != 0)
+ server->caps |= NFS_CAP_SYMLINKS;
+ server->acl_bitmask = res.acl_bitmask;
+ }
+ return status;
+}
+
+static int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
+{
+ struct nfs4_exception exception = { };
+ int err;
+ do {
+ err = nfs4_handle_exception(server,
+ _nfs4_server_capabilities(server, fhandle),
+ &exception);
+ } while (exception.retry);
+ return err;
+}
+
+static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
+ struct nfs_fsinfo *info)
+{
+ struct nfs_fattr * fattr = info->fattr;
+ struct nfs4_lookup_root_arg args = {
+ .bitmask = nfs4_fattr_bitmap,
+ };
+ struct nfs4_lookup_res res = {
+ .server = server,
+ .fattr = fattr,
+ .fh = fhandle,
+ };
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
+ .rpc_argp = &args,
+ .rpc_resp = &res,
+ };
+ fattr->valid = 0;
+ return rpc_call_sync(server->client, &msg, 0);
+}
+
+static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
+ struct nfs_fsinfo *info)
+{
+ struct nfs4_exception exception = { };
+ int err;
+ do {
+ err = nfs4_handle_exception(server,
+ _nfs4_lookup_root(server, fhandle, info),
+ &exception);
+ } while (exception.retry);
+ return err;
+}
+
+static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
+ struct nfs_fsinfo *info)
+{
+ struct nfs_fattr * fattr = info->fattr;
+ unsigned char * p;
+ struct qstr q;
+ struct nfs4_lookup_arg args = {
+ .dir_fh = fhandle,
+ .name = &q,
+ .bitmask = nfs4_fattr_bitmap,
+ };
+ struct nfs4_lookup_res res = {
+ .server = server,
+ .fattr = fattr,
+ .fh = fhandle,
+ };
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
+ .rpc_argp = &args,
+ .rpc_resp = &res,
+ };
+ int status;
+
+ /*
+ * Now we do a separate LOOKUP for each component of the mount path.
+ * The LOOKUPs are done separately so that we can conveniently
+ * catch an ERR_WRONGSEC if it occurs along the way...
+ */
+ status = nfs4_lookup_root(server, fhandle, info);
+ if (status)
+ goto out;
+
+ p = server->mnt_path;
+ for (;;) {
+ struct nfs4_exception exception = { };
+
+ while (*p == '/')
+ p++;
+ if (!*p)
+ break;
+ q.name = p;
+ while (*p && (*p != '/'))
+ p++;
+ q.len = p - q.name;
+
+ do {
+ fattr->valid = 0;
+ status = nfs4_handle_exception(server,
+ rpc_call_sync(server->client, &msg, 0),
+ &exception);
+ } while (exception.retry);
+ if (status == 0)
+ continue;
+ if (status == -ENOENT) {
+ printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path);
+ printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n");
+ }
+ break;
+ }
+ if (status == 0)
+ status = nfs4_server_capabilities(server, fhandle);
+ if (status == 0)
+ status = nfs4_do_fsinfo(server, fhandle, info);
+out:
+ return status;
+}
+
+static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
+{
+ struct nfs4_getattr_arg args = {
+ .fh = fhandle,
+ .bitmask = server->attr_bitmask,
+ };
+ struct nfs4_getattr_res res = {
+ .fattr = fattr,
+ .server = server,
+ };
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
+ .rpc_argp = &args,
+ .rpc_resp = &res,
+ };
+
+ fattr->valid = 0;
+ return rpc_call_sync(server->client, &msg, 0);
+}
+
+static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
+{
+ struct nfs4_exception exception = { };
+ int err;
+ do {
+ err = nfs4_handle_exception(server,
+ _nfs4_proc_getattr(server, fhandle, fattr),
+ &exception);
+ } while (exception.retry);
+ return err;
+}
+
+/*
+ * The file is not closed if it is opened due to the a request to change
+ * the size of the file. The open call will not be needed once the
+ * VFS layer lookup-intents are implemented.
+ *
+ * Close is called when the inode is destroyed.
+ * If we haven't opened the file for O_WRONLY, we
+ * need to in the size_change case to obtain a stateid.
+ *
+ * Got race?
+ * Because OPEN is always done by name in nfsv4, it is
+ * possible that we opened a different file by the same
+ * name. We can recognize this race condition, but we
+ * can't do anything about it besides returning an error.
+ *
+ * This will be fixed with VFS changes (lookup-intent).
+ */
+static int
+nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
+ struct iattr *sattr)
+{
+ struct inode * inode = dentry->d_inode;
+ int size_change = sattr->ia_valid & ATTR_SIZE;
+ struct nfs4_state *state = NULL;
+ int need_iput = 0;
+ int status;
+
+ fattr->valid = 0;
+
+ if (size_change) {
+ struct rpc_cred *cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
+ if (IS_ERR(cred))
+ return PTR_ERR(cred);
+ state = nfs4_find_state(inode, cred, FMODE_WRITE);
+ if (state == NULL) {
+ state = nfs4_open_delegated(dentry->d_inode,
+ FMODE_WRITE, cred);
+ if (IS_ERR(state))
+ state = nfs4_do_open(dentry->d_parent->d_inode,
+ dentry, FMODE_WRITE,
+ NULL, cred);
+ need_iput = 1;
+ }
+ put_rpccred(cred);
+ if (IS_ERR(state))
+ return PTR_ERR(state);
+
+ if (state->inode != inode) {
+ printk(KERN_WARNING "nfs: raced in setattr (%p != %p), returning -EIO\n", inode, state->inode);
+ status = -EIO;
+ goto out;
+ }
+ }
+ status = nfs4_do_setattr(NFS_SERVER(inode), fattr,
+ NFS_FH(inode), sattr, state);
+out:
+ if (state) {
+ inode = state->inode;
+ nfs4_close_state(state, FMODE_WRITE);
+ if (need_iput)
+ iput(inode);
+ }
+ return status;
+}
+
+static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
+ struct nfs_fh *fhandle, struct nfs_fattr *fattr)
+{
+ int status;
+ struct nfs_server *server = NFS_SERVER(dir);
+ struct nfs4_lookup_arg args = {
+ .bitmask = server->attr_bitmask,
+ .dir_fh = NFS_FH(dir),
+ .name = name,
+ };
+ struct nfs4_lookup_res res = {
+ .server = server,
+ .fattr = fattr,
+ .fh = fhandle,
+ };
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
+ .rpc_argp = &args,
+ .rpc_resp = &res,
+ };
+
+ fattr->valid = 0;
+
+ dprintk("NFS call lookup %s\n", name->name);
+ status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
+ dprintk("NFS reply lookup: %d\n", status);
+ return status;
+}
+
+static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
+{
+ struct nfs4_exception exception = { };
+ int err;
+ do {
+ err = nfs4_handle_exception(NFS_SERVER(dir),
+ _nfs4_proc_lookup(dir, name, fhandle, fattr),
+ &exception);
+ } while (exception.retry);
+ return err;
+}
+
+static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
+{
+ struct nfs4_accessargs args = {
+ .fh = NFS_FH(inode),
+ };
+ struct nfs4_accessres res = { 0 };
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
+ .rpc_argp = &args,
+ .rpc_resp = &res,
+ .rpc_cred = entry->cred,
+ };
+ int mode = entry->mask;
+ int status;
+
+ /*
+ * Determine which access bits we want to ask for...
+ */
+ if (mode & MAY_READ)
+ args.access |= NFS4_ACCESS_READ;
+ if (S_ISDIR(inode->i_mode)) {
+ if (mode & MAY_WRITE)
+ args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
+ if (mode & MAY_EXEC)
+ args.access |= NFS4_ACCESS_LOOKUP;
+ } else {
+ if (mode & MAY_WRITE)
+ args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
+ if (mode & MAY_EXEC)
+ args.access |= NFS4_ACCESS_EXECUTE;
+ }
+ status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
+ if (!status) {
+ entry->mask = 0;
+ if (res.access & NFS4_ACCESS_READ)
+ entry->mask |= MAY_READ;
+ if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
+ entry->mask |= MAY_WRITE;
+ if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
+ entry->mask |= MAY_EXEC;
+ }
+ return status;
+}
+
+static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
+{
+ struct nfs4_exception exception = { };
+ int err;
+ do {
+ err = nfs4_handle_exception(NFS_SERVER(inode),
+ _nfs4_proc_access(inode, entry),
+ &exception);
+ } while (exception.retry);
+ return err;
+}
+
+/*
+ * TODO: For the time being, we don't try to get any attributes
+ * along with any of the zero-copy operations READ, READDIR,
+ * READLINK, WRITE.
+ *
+ * In the case of the first three, we want to put the GETATTR
+ * after the read-type operation -- this is because it is hard
+ * to predict the length of a GETATTR response in v4, and thus
+ * align the READ data correctly. This means that the GETATTR
+ * may end up partially falling into the page cache, and we should
+ * shift it into the 'tail' of the xdr_buf before processing.
+ * To do this efficiently, we need to know the total length
+ * of data received, which doesn't seem to be available outside
+ * of the RPC layer.
+ *
+ * In the case of WRITE, we also want to put the GETATTR after
+ * the operation -- in this case because we want to make sure
+ * we get the post-operation mtime and size. This means that
+ * we can't use xdr_encode_pages() as written: we need a variant
+ * of it which would leave room in the 'tail' iovec.
+ *
+ * Both of these changes to the XDR layer would in fact be quite
+ * minor, but I decided to leave them for a subsequent patch.
+ */
+static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
+ unsigned int pgbase, unsigned int pglen)
+{
+ struct nfs4_readlink args = {
+ .fh = NFS_FH(inode),
+ .pgbase = pgbase,
+ .pglen = pglen,
+ .pages = &page,
+ };
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
+ .rpc_argp = &args,
+ .rpc_resp = NULL,
+ };
+
+ return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
+}
+
+static int nfs4_proc_readlink(struct inode *inode, struct page *page,
+ unsigned int pgbase, unsigned int pglen)
+{
+ struct nfs4_exception exception = { };
+ int err;
+ do {
+ err = nfs4_handle_exception(NFS_SERVER(inode),
+ _nfs4_proc_readlink(inode, page, pgbase, pglen),
+ &exception);
+ } while (exception.retry);
+ return err;
+}
+
+static int _nfs4_proc_read(struct nfs_read_data *rdata)
+{
+ int flags = rdata->flags;
+ struct inode *inode = rdata->inode;
+ struct nfs_fattr *fattr = rdata->res.fattr;
+ struct nfs_server *server = NFS_SERVER(inode);
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
+ .rpc_argp = &rdata->args,
+ .rpc_resp = &rdata->res,
+ .rpc_cred = rdata->cred,
+ };
+ unsigned long timestamp = jiffies;
+ int status;
+
+ dprintk("NFS call read %d @ %Ld\n", rdata->args.count,
+ (long long) rdata->args.offset);
+
+ fattr->valid = 0;
+ status = rpc_call_sync(server->client, &msg, flags);
+ if (!status)
+ renew_lease(server, timestamp);
+ dprintk("NFS reply read: %d\n", status);
+ return status;
+}
+
+static int nfs4_proc_read(struct nfs_read_data *rdata)
+{
+ struct nfs4_exception exception = { };
+ int err;
+ do {
+ err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
+ _nfs4_proc_read(rdata),
+ &exception);
+ } while (exception.retry);
+ return err;
+}
+
+static int _nfs4_proc_write(struct nfs_write_data *wdata)
+{
+ int rpcflags = wdata->flags;
+ struct inode *inode = wdata->inode;
+ struct nfs_fattr *fattr = wdata->res.fattr;
+ struct nfs_server *server = NFS_SERVER(inode);
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
+ .rpc_argp = &wdata->args,
+ .rpc_resp = &wdata->res,
+ .rpc_cred = wdata->cred,
+ };
+ int status;
+
+ dprintk("NFS call write %d @ %Ld\n", wdata->args.count,
+ (long long) wdata->args.offset);
+
+ fattr->valid = 0;
+ status = rpc_call_sync(server->client, &msg, rpcflags);
+ dprintk("NFS reply write: %d\n", status);
+ return status;
+}
+
+static int nfs4_proc_write(struct nfs_write_data *wdata)
+{
+ struct nfs4_exception exception = { };
+ int err;
+ do {
+ err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
+ _nfs4_proc_write(wdata),
+ &exception);
+ } while (exception.retry);
+ return err;
+}
+
+static int _nfs4_proc_commit(struct nfs_write_data *cdata)
+{
+ struct inode *inode = cdata->inode;
+ struct nfs_fattr *fattr = cdata->res.fattr;
+ struct nfs_server *server = NFS_SERVER(inode);
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
+ .rpc_argp = &cdata->args,
+ .rpc_resp = &cdata->res,
+ .rpc_cred = cdata->cred,
+ };
+ int status;
+
+ dprintk("NFS call commit %d @ %Ld\n", cdata->args.count,
+ (long long) cdata->args.offset);
+
+ fattr->valid = 0;
+ status = rpc_call_sync(server->client, &msg, 0);
+ dprintk("NFS reply commit: %d\n", status);
+ return status;
+}
+
+static int nfs4_proc_commit(struct nfs_write_data *cdata)
+{
+ struct nfs4_exception exception = { };
+ int err;
+ do {
+ err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
+ _nfs4_proc_commit(cdata),
+ &exception);
+ } while (exception.retry);
+ return err;
+}
+
+/*
+ * Got race?
+ * We will need to arrange for the VFS layer to provide an atomic open.
+ * Until then, this create/open method is prone to inefficiency and race
+ * conditions due to the lookup, create, and open VFS calls from sys_open()
+ * placed on the wire.
+ *
+ * Given the above sorry state of affairs, I'm simply sending an OPEN.
+ * The file will be opened again in the subsequent VFS open call
+ * (nfs4_proc_file_open).
+ *
+ * The open for read will just hang around to be used by any process that
+ * opens the file O_RDONLY. This will all be resolved with the VFS changes.
+ */
+
+static int
+nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
+ int flags)
+{
+ struct nfs4_state *state;
+ struct rpc_cred *cred;
+ int status = 0;
+
+ cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
+ if (IS_ERR(cred)) {
+ status = PTR_ERR(cred);
+ goto out;
+ }
+ state = nfs4_do_open(dir, dentry, flags, sattr, cred);
+ put_rpccred(cred);
+ if (IS_ERR(state)) {
+ status = PTR_ERR(state);
+ goto out;
+ }
+ d_instantiate(dentry, state->inode);
+ if (flags & O_EXCL) {
+ struct nfs_fattr fattr;
+ status = nfs4_do_setattr(NFS_SERVER(dir), &fattr,
+ NFS_FH(state->inode), sattr, state);
+ if (status == 0)
+ goto out;
+ } else if (flags != 0)
+ goto out;
+ nfs4_close_state(state, flags);
+out:
+ return status;
+}
+
+static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
+{
+ struct nfs4_remove_arg args = {
+ .fh = NFS_FH(dir),
+ .name = name,
+ };
+ struct nfs4_change_info res;
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
+ .rpc_argp = &args,
+ .rpc_resp = &res,
+ };
+ int status;
+
+ status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
+ if (status == 0)
+ update_changeattr(dir, &res);
+ return status;
+}
+
+static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
+{
+ struct nfs4_exception exception = { };
+ int err;
+ do {
+ err = nfs4_handle_exception(NFS_SERVER(dir),
+ _nfs4_proc_remove(dir, name),
+ &exception);
+ } while (exception.retry);
+ return err;
+}
+
+struct unlink_desc {
+ struct nfs4_remove_arg args;
+ struct nfs4_change_info res;
+};
+
+static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
+ struct qstr *name)
+{
+ struct unlink_desc *up;
+
+ up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
+ if (!up)
+ return -ENOMEM;
+
+ up->args.fh = NFS_FH(dir->d_inode);
+ up->args.name = name;
+
+ msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
+ msg->rpc_argp = &up->args;
+ msg->rpc_resp = &up->res;
+ return 0;
+}
+
+static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
+{
+ struct rpc_message *msg = &task->tk_msg;
+ struct unlink_desc *up;
+
+ if (msg->rpc_resp != NULL) {
+ up = container_of(msg->rpc_resp, struct unlink_desc, res);
+ update_changeattr(dir->d_inode, &up->res);
+ kfree(up);
+ msg->rpc_resp = NULL;
+ msg->rpc_argp = NULL;
+ }
+ return 0;
+}
+
+static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
+ struct inode *new_dir, struct qstr *new_name)
+{
+ struct nfs4_rename_arg arg = {
+ .old_dir = NFS_FH(old_dir),
+ .new_dir = NFS_FH(new_dir),
+ .old_name = old_name,
+ .new_name = new_name,
+ };
+ struct nfs4_rename_res res = { };
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
+ .rpc_argp = &arg,
+ .rpc_resp = &res,
+ };
+ int status;
+
+ status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
+
+ if (!status) {
+ update_changeattr(old_dir, &res.old_cinfo);
+ update_changeattr(new_dir, &res.new_cinfo);
+ }
+ return status;
+}
+
+static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
+ struct inode *new_dir, struct qstr *new_name)
+{
+ struct nfs4_exception exception = { };
+ int err;
+ do {
+ err = nfs4_handle_exception(NFS_SERVER(old_dir),
+ _nfs4_proc_rename(old_dir, old_name,
+ new_dir, new_name),
+ &exception);
+ } while (exception.retry);
+ return err;
+}
+
+static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
+{
+ struct nfs4_link_arg arg = {
+ .fh = NFS_FH(inode),
+ .dir_fh = NFS_FH(dir),
+ .name = name,
+ };
+ struct nfs4_change_info cinfo = { };
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
+ .rpc_argp = &arg,
+ .rpc_resp = &cinfo,
+ };
+ int status;
+
+ status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
+ if (!status)
+ update_changeattr(dir, &cinfo);
+
+ return status;
+}
+
+static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
+{
+ struct nfs4_exception exception = { };
+ int err;
+ do {
+ err = nfs4_handle_exception(NFS_SERVER(inode),
+ _nfs4_proc_link(inode, dir, name),
+ &exception);
+ } while (exception.retry);
+ return err;
+}
+
+static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
+ struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
+ struct nfs_fattr *fattr)
+{
+ struct nfs_server *server = NFS_SERVER(dir);
+ struct nfs4_create_arg arg = {
+ .dir_fh = NFS_FH(dir),
+ .server = server,
+ .name = name,
+ .attrs = sattr,
+ .ftype = NF4LNK,
+ .bitmask = server->attr_bitmask,
+ };
+ struct nfs4_create_res res = {
+ .server = server,
+ .fh = fhandle,
+ .fattr = fattr,
+ };
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
+ .rpc_argp = &arg,
+ .rpc_resp = &res,
+ };
+ int status;
+
+ if (path->len > NFS4_MAXPATHLEN)
+ return -ENAMETOOLONG;
+ arg.u.symlink = path;
+ fattr->valid = 0;
+
+ status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
+ if (!status)
+ update_changeattr(dir, &res.dir_cinfo);
+ return status;
+}
+
+static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
+ struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
+ struct nfs_fattr *fattr)
+{
+ struct nfs4_exception exception = { };
+ int err;
+ do {
+ err = nfs4_handle_exception(NFS_SERVER(dir),
+ _nfs4_proc_symlink(dir, name, path, sattr,
+ fhandle, fattr),
+ &exception);
+ } while (exception.retry);
+ return err;
+}
+
+static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
+ struct iattr *sattr)
+{
+ struct nfs_server *server = NFS_SERVER(dir);
+ struct nfs_fh fhandle;
+ struct nfs_fattr fattr;
+ struct nfs4_create_arg arg = {
+ .dir_fh = NFS_FH(dir),
+ .server = server,
+ .name = &dentry->d_name,
+ .attrs = sattr,
+ .ftype = NF4DIR,
+ .bitmask = server->attr_bitmask,
+ };
+ struct nfs4_create_res res = {
+ .server = server,
+ .fh = &fhandle,
+ .fattr = &fattr,
+ };
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
+ .rpc_argp = &arg,
+ .rpc_resp = &res,
+ };
+ int status;
+
+ fattr.valid = 0;
+
+ status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
+ if (!status) {
+ update_changeattr(dir, &res.dir_cinfo);
+ status = nfs_instantiate(dentry, &fhandle, &fattr);
+ }
+ return status;
+}
+
+static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
+ struct iattr *sattr)
+{
+ struct nfs4_exception exception = { };
+ int err;
+ do {
+ err = nfs4_handle_exception(NFS_SERVER(dir),
+ _nfs4_proc_mkdir(dir, dentry, sattr),
+ &exception);
+ } while (exception.retry);
+ return err;
+}
+
+static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
+ u64 cookie, struct page *page, unsigned int count, int plus)
+{
+ struct inode *dir = dentry->d_inode;
+ struct nfs4_readdir_arg args = {
+ .fh = NFS_FH(dir),
+ .pages = &page,
+ .pgbase = 0,
+ .count = count,
+ .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
+ };
+ struct nfs4_readdir_res res;
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
+ .rpc_argp = &args,
+ .rpc_resp = &res,
+ .rpc_cred = cred,
+ };
+ int status;
+
+ lock_kernel();
+ nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
+ res.pgbase = args.pgbase;
+ status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
+ if (status == 0)
+ memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
+ unlock_kernel();
+ return status;
+}
+
+static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
+ u64 cookie, struct page *page, unsigned int count, int plus)
+{
+ struct nfs4_exception exception = { };
+ int err;
+ do {
+ err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
+ _nfs4_proc_readdir(dentry, cred, cookie,
+ page, count, plus),
+ &exception);
+ } while (exception.retry);
+ return err;
+}
+
+static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
+ struct iattr *sattr, dev_t rdev)
+{
+ struct nfs_server *server = NFS_SERVER(dir);
+ struct nfs_fh fh;
+ struct nfs_fattr fattr;
+ struct nfs4_create_arg arg = {
+ .dir_fh = NFS_FH(dir),
+ .server = server,
+ .name = &dentry->d_name,
+ .attrs = sattr,
+ .bitmask = server->attr_bitmask,
+ };
+ struct nfs4_create_res res = {
+ .server = server,
+ .fh = &fh,
+ .fattr = &fattr,
+ };
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
+ .rpc_argp = &arg,
+ .rpc_resp = &res,
+ };
+ int status;
+ int mode = sattr->ia_mode;
+
+ fattr.valid = 0;
+
+ BUG_ON(!(sattr->ia_valid & ATTR_MODE));
+ BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
+ if (S_ISFIFO(mode))
+ arg.ftype = NF4FIFO;
+ else if (S_ISBLK(mode)) {
+ arg.ftype = NF4BLK;
+ arg.u.device.specdata1 = MAJOR(rdev);
+ arg.u.device.specdata2 = MINOR(rdev);
+ }
+ else if (S_ISCHR(mode)) {
+ arg.ftype = NF4CHR;
+ arg.u.device.specdata1 = MAJOR(rdev);
+ arg.u.device.specdata2 = MINOR(rdev);
+ }
+ else
+ arg.ftype = NF4SOCK;
+
+ status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
+ if (status == 0) {
+ update_changeattr(dir, &res.dir_cinfo);
+ status = nfs_instantiate(dentry, &fh, &fattr);
+ }
+ return status;
+}
+
+static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
+ struct iattr *sattr, dev_t rdev)
+{
+ struct nfs4_exception exception = { };
+ int err;
+ do {
+ err = nfs4_handle_exception(NFS_SERVER(dir),
+ _nfs4_proc_mknod(dir, dentry, sattr, rdev),
+ &exception);
+ } while (exception.retry);
+ return err;
+}
+
+static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
+ struct nfs_fsstat *fsstat)
+{
+ struct nfs4_statfs_arg args = {
+ .fh = fhandle,
+ .bitmask = server->attr_bitmask,
+ };
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
+ .rpc_argp = &args,
+ .rpc_resp = fsstat,
+ };
+
+ fsstat->fattr->valid = 0;
+ return rpc_call_sync(server->client, &msg, 0);
+}
+
+static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
+{
+ struct nfs4_exception exception = { };
+ int err;
+ do {
+ err = nfs4_handle_exception(server,
+ _nfs4_proc_statfs(server, fhandle, fsstat),
+ &exception);
+ } while (exception.retry);
+ return err;
+}
+
+static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
+ struct nfs_fsinfo *fsinfo)
+{
+ struct nfs4_fsinfo_arg args = {
+ .fh = fhandle,
+ .bitmask = server->attr_bitmask,
+ };
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
+ .rpc_argp = &args,
+ .rpc_resp = fsinfo,
+ };
+
+ return rpc_call_sync(server->client, &msg, 0);
+}
+
+static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
+{
+ struct nfs4_exception exception = { };
+ int err;
+
+ do {
+ err = nfs4_handle_exception(server,
+ _nfs4_do_fsinfo(server, fhandle, fsinfo),
+ &exception);
+ } while (exception.retry);
+ return err;
+}
+
+static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
+{
+ fsinfo->fattr->valid = 0;
+ return nfs4_do_fsinfo(server, fhandle, fsinfo);
+}
+
+static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
+ struct nfs_pathconf *pathconf)
+{
+ struct nfs4_pathconf_arg args = {
+ .fh = fhandle,
+ .bitmask = server->attr_bitmask,
+ };
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
+ .rpc_argp = &args,
+ .rpc_resp = pathconf,
+ };
+
+ /* None of the pathconf attributes are mandatory to implement */
+ if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
+ memset(pathconf, 0, sizeof(*pathconf));
+ return 0;
+ }
+
+ pathconf->fattr->valid = 0;
+ return rpc_call_sync(server->client, &msg, 0);
+}
+
+static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
+ struct nfs_pathconf *pathconf)
+{
+ struct nfs4_exception exception = { };
+ int err;
+
+ do {
+ err = nfs4_handle_exception(server,
+ _nfs4_proc_pathconf(server, fhandle, pathconf),
+ &exception);
+ } while (exception.retry);
+ return err;
+}
+
+static void
+nfs4_read_done(struct rpc_task *task)
+{
+ struct nfs_read_data *data = (struct nfs_read_data *) task->tk_calldata;
+ struct inode *inode = data->inode;
+
+ if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
+ rpc_restart_call(task);
+ return;
+ }
+ if (task->tk_status > 0)
+ renew_lease(NFS_SERVER(inode), data->timestamp);
+ /* Call back common NFS readpage processing */
+ nfs_readpage_result(task);
+}
+
+static void
+nfs4_proc_read_setup(struct nfs_read_data *data)
+{
+ struct rpc_task *task = &data->task;
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
+ .rpc_argp = &data->args,
+ .rpc_resp = &data->res,
+ .rpc_cred = data->cred,
+ };
+ struct inode *inode = data->inode;
+ int flags;
+
+ data->timestamp = jiffies;
+
+ /* N.B. Do we need to test? Never called for swapfile inode */
+ flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
+
+ /* Finalize the task. */
+ rpc_init_task(task, NFS_CLIENT(inode), nfs4_read_done, flags);
+ rpc_call_setup(task, &msg, 0);
+}
+
+static void
+nfs4_write_done(struct rpc_task *task)
+{
+ struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
+ struct inode *inode = data->inode;
+
+ if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
+ rpc_restart_call(task);
+ return;
+ }
+ if (task->tk_status >= 0)
+ renew_lease(NFS_SERVER(inode), data->timestamp);
+ /* Call back common NFS writeback processing */
+ nfs_writeback_done(task);
+}
+
+static void
+nfs4_proc_write_setup(struct nfs_write_data *data, int how)
+{
+ struct rpc_task *task = &data->task;
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
+ .rpc_argp = &data->args,
+ .rpc_resp = &data->res,
+ .rpc_cred = data->cred,
+ };
+ struct inode *inode = data->inode;
+ int stable;
+ int flags;
+
+ if (how & FLUSH_STABLE) {
+ if (!NFS_I(inode)->ncommit)
+ stable = NFS_FILE_SYNC;
+ else
+ stable = NFS_DATA_SYNC;
+ } else
+ stable = NFS_UNSTABLE;
+ data->args.stable = stable;
+
+ data->timestamp = jiffies;
+
+ /* Set the initial flags for the task. */
+ flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
+
+ /* Finalize the task. */
+ rpc_init_task(task, NFS_CLIENT(inode), nfs4_write_done, flags);
+ rpc_call_setup(task, &msg, 0);
+}
+
+static void
+nfs4_commit_done(struct rpc_task *task)
+{
+ struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
+ struct inode *inode = data->inode;
+
+ if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
+ rpc_restart_call(task);
+ return;
+ }
+ /* Call back common NFS writeback processing */
+ nfs_commit_done(task);
+}
+
+static void
+nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
+{
+ struct rpc_task *task = &data->task;
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
+ .rpc_argp = &data->args,
+ .rpc_resp = &data->res,
+ .rpc_cred = data->cred,
+ };
+ struct inode *inode = data->inode;
+ int flags;
+
+ /* Set the initial flags for the task. */
+ flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
+
+ /* Finalize the task. */
+ rpc_init_task(task, NFS_CLIENT(inode), nfs4_commit_done, flags);
+ rpc_call_setup(task, &msg, 0);
+}
+
+/*
+ * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
+ * standalone procedure for queueing an asynchronous RENEW.
+ */
+static void
+renew_done(struct rpc_task *task)
+{
+ struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
+ unsigned long timestamp = (unsigned long)task->tk_calldata;
+
+ if (task->tk_status < 0) {
+ switch (task->tk_status) {
+ case -NFS4ERR_STALE_CLIENTID:
+ case -NFS4ERR_EXPIRED:
+ case -NFS4ERR_CB_PATH_DOWN:
+ nfs4_schedule_state_recovery(clp);
+ }
+ return;
+ }
+ spin_lock(&clp->cl_lock);
+ if (time_before(clp->cl_last_renewal,timestamp))
+ clp->cl_last_renewal = timestamp;
+ spin_unlock(&clp->cl_lock);
+}
+
+int
+nfs4_proc_async_renew(struct nfs4_client *clp)
+{
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
+ .rpc_argp = clp,
+ .rpc_cred = clp->cl_cred,
+ };
+
+ return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
+ renew_done, (void *)jiffies);
+}
+
+int
+nfs4_proc_renew(struct nfs4_client *clp)
+{
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
+ .rpc_argp = clp,
+ .rpc_cred = clp->cl_cred,
+ };
+ unsigned long now = jiffies;
+ int status;
+
+ status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
+ if (status < 0)
+ return status;
+ spin_lock(&clp->cl_lock);
+ if (time_before(clp->cl_last_renewal,now))
+ clp->cl_last_renewal = now;
+ spin_unlock(&clp->cl_lock);
+ return 0;
+}
+
+/*
+ * We will need to arrange for the VFS layer to provide an atomic open.
+ * Until then, this open method is prone to inefficiency and race conditions
+ * due to the lookup, potential create, and open VFS calls from sys_open()
+ * placed on the wire.
+ */
+static int
+nfs4_proc_file_open(struct inode *inode, struct file *filp)
+{
+ struct dentry *dentry = filp->f_dentry;
+ struct nfs_open_context *ctx;
+ struct nfs4_state *state = NULL;
+ struct rpc_cred *cred;
+ int status = -ENOMEM;
+
+ dprintk("nfs4_proc_file_open: starting on (%.*s/%.*s)\n",
+ (int)dentry->d_parent->d_name.len,
+ dentry->d_parent->d_name.name,
+ (int)dentry->d_name.len, dentry->d_name.name);
+
+
+ /* Find our open stateid */
+ cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
+ if (IS_ERR(cred))
+ return PTR_ERR(cred);
+ ctx = alloc_nfs_open_context(dentry, cred);
+ put_rpccred(cred);
+ if (unlikely(ctx == NULL))
+ return -ENOMEM;
+ status = -EIO; /* ERACE actually */
+ state = nfs4_find_state(inode, cred, filp->f_mode);
+ if (unlikely(state == NULL))
+ goto no_state;
+ ctx->state = state;
+ nfs4_close_state(state, filp->f_mode);
+ ctx->mode = filp->f_mode;
+ nfs_file_set_open_context(filp, ctx);
+ put_nfs_open_context(ctx);
+ if (filp->f_mode & FMODE_WRITE)
+ nfs_begin_data_update(inode);
+ return 0;
+no_state:
+ printk(KERN_WARNING "NFS: v4 raced in function %s\n", __FUNCTION__);
+ put_nfs_open_context(ctx);
+ return status;
+}
+
+/*
+ * Release our state
+ */
+static int
+nfs4_proc_file_release(struct inode *inode, struct file *filp)
+{
+ if (filp->f_mode & FMODE_WRITE)
+ nfs_end_data_update(inode);
+ nfs_file_clear_open_context(filp);
+ return 0;
+}
+
+static int
+nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server)
+{
+ struct nfs4_client *clp = server->nfs4_state;
+
+ if (!clp || task->tk_status >= 0)
+ return 0;
+ switch(task->tk_status) {
+ case -NFS4ERR_STALE_CLIENTID:
+ case -NFS4ERR_STALE_STATEID:
+ case -NFS4ERR_EXPIRED:
+ rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
+ nfs4_schedule_state_recovery(clp);
+ if (test_bit(NFS4CLNT_OK, &clp->cl_state))
+ rpc_wake_up_task(task);
+ task->tk_status = 0;
+ return -EAGAIN;
+ case -NFS4ERR_GRACE:
+ case -NFS4ERR_DELAY:
+ rpc_delay(task, NFS4_POLL_RETRY_MAX);
+ task->tk_status = 0;
+ return -EAGAIN;
+ case -NFS4ERR_OLD_STATEID:
+ task->tk_status = 0;
+ return -EAGAIN;
+ }
+ task->tk_status = nfs4_map_errors(task->tk_status);
+ return 0;
+}
+
+static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
+{
+ DEFINE_WAIT(wait);
+ sigset_t oldset;
+ int interruptible, res = 0;
+
+ might_sleep();
+
+ rpc_clnt_sigmask(clnt, &oldset);
+ interruptible = TASK_UNINTERRUPTIBLE;
+ if (clnt->cl_intr)
+ interruptible = TASK_INTERRUPTIBLE;
+ prepare_to_wait(&clp->cl_waitq, &wait, interruptible);
+ nfs4_schedule_state_recovery(clp);
+ if (clnt->cl_intr && signalled())
+ res = -ERESTARTSYS;
+ else if (!test_bit(NFS4CLNT_OK, &clp->cl_state))
+ schedule();
+ finish_wait(&clp->cl_waitq, &wait);
+ rpc_clnt_sigunmask(clnt, &oldset);
+ return res;
+}
+
+static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
+{
+ sigset_t oldset;
+ int res = 0;
+
+ might_sleep();
+
+ if (*timeout <= 0)
+ *timeout = NFS4_POLL_RETRY_MIN;
+ if (*timeout > NFS4_POLL_RETRY_MAX)
+ *timeout = NFS4_POLL_RETRY_MAX;
+ rpc_clnt_sigmask(clnt, &oldset);
+ if (clnt->cl_intr) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule_timeout(*timeout);
+ if (signalled())
+ res = -ERESTARTSYS;
+ } else {
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(*timeout);
+ }
+ rpc_clnt_sigunmask(clnt, &oldset);
+ *timeout <<= 1;
+ return res;
+}
+
+/* This is the error handling routine for processes that are allowed
+ * to sleep.
+ */
+int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
+{
+ struct nfs4_client *clp = server->nfs4_state;
+ int ret = errorcode;
+
+ exception->retry = 0;
+ switch(errorcode) {
+ case 0:
+ return 0;
+ case -NFS4ERR_STALE_CLIENTID:
+ case -NFS4ERR_STALE_STATEID:
+ case -NFS4ERR_EXPIRED:
+ ret = nfs4_wait_clnt_recover(server->client, clp);
+ if (ret == 0)
+ exception->retry = 1;
+ break;
+ case -NFS4ERR_GRACE:
+ case -NFS4ERR_DELAY:
+ ret = nfs4_delay(server->client, &exception->timeout);
+ if (ret == 0)
+ exception->retry = 1;
+ break;
+ case -NFS4ERR_OLD_STATEID:
+ if (ret == 0)
+ exception->retry = 1;
+ }
+ /* We failed to handle the error */
+ return nfs4_map_errors(ret);
+}
+
+int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port)
+{
+ nfs4_verifier sc_verifier;
+ struct nfs4_setclientid setclientid = {
+ .sc_verifier = &sc_verifier,
+ .sc_prog = program,
+ };
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
+ .rpc_argp = &setclientid,
+ .rpc_resp = clp,
+ .rpc_cred = clp->cl_cred,
+ };
+ u32 *p;
+ int loop = 0;
+ int status;
+
+ p = (u32*)sc_verifier.data;
+ *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
+ *p = htonl((u32)clp->cl_boot_time.tv_nsec);
+
+ for(;;) {
+ setclientid.sc_name_len = scnprintf(setclientid.sc_name,
+ sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
+ clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr),
+ clp->cl_cred->cr_ops->cr_name,
+ clp->cl_id_uniquifier);
+ setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
+ sizeof(setclientid.sc_netid), "tcp");
+ setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
+ sizeof(setclientid.sc_uaddr), "%s.%d.%d",
+ clp->cl_ipaddr, port >> 8, port & 255);
+
+ status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
+ if (status != -NFS4ERR_CLID_INUSE)
+ break;
+ if (signalled())
+ break;
+ if (loop++ & 1)
+ ssleep(clp->cl_lease_time + 1);
+ else
+ if (++clp->cl_id_uniquifier == 0)
+ break;
+ }
+ return status;
+}
+
+int
+nfs4_proc_setclientid_confirm(struct nfs4_client *clp)
+{
+ struct nfs_fsinfo fsinfo;
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
+ .rpc_argp = clp,
+ .rpc_resp = &fsinfo,
+ .rpc_cred = clp->cl_cred,
+ };
+ unsigned long now;
+ int status;
+
+ now = jiffies;
+ status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
+ if (status == 0) {
+ spin_lock(&clp->cl_lock);
+ clp->cl_lease_time = fsinfo.lease_time * HZ;
+ clp->cl_last_renewal = now;
+ spin_unlock(&clp->cl_lock);
+ }
+ return status;
+}
+
+static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
+{
+ struct nfs4_delegreturnargs args = {
+ .fhandle = NFS_FH(inode),
+ .stateid = stateid,
+ };
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
+ .rpc_argp = &args,
+ .rpc_cred = cred,
+ };
+
+ return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
+}
+
+int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
+{
+ struct nfs_server *server = NFS_SERVER(inode);
+ struct nfs4_exception exception = { };
+ int err;
+ do {
+ err = _nfs4_proc_delegreturn(inode, cred, stateid);
+ switch (err) {
+ case -NFS4ERR_STALE_STATEID:
+ case -NFS4ERR_EXPIRED:
+ nfs4_schedule_state_recovery(server->nfs4_state);
+ case 0:
+ return 0;
+ }
+ err = nfs4_handle_exception(server, err, &exception);
+ } while (exception.retry);
+ return err;
+}
+
+#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
+#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
+
+/*
+ * sleep, with exponential backoff, and retry the LOCK operation.
+ */
+static unsigned long
+nfs4_set_lock_task_retry(unsigned long timeout)
+{
+ current->state = TASK_INTERRUPTIBLE;
+ schedule_timeout(timeout);
+ timeout <<= 1;
+ if (timeout > NFS4_LOCK_MAXTIMEOUT)
+ return NFS4_LOCK_MAXTIMEOUT;
+ return timeout;
+}
+
+static inline int
+nfs4_lck_type(int cmd, struct file_lock *request)
+{
+ /* set lock type */
+ switch (request->fl_type) {
+ case F_RDLCK:
+ return IS_SETLKW(cmd) ? NFS4_READW_LT : NFS4_READ_LT;
+ case F_WRLCK:
+ return IS_SETLKW(cmd) ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
+ case F_UNLCK:
+ return NFS4_WRITE_LT;
+ }
+ BUG();
+ return 0;
+}
+
+static inline uint64_t
+nfs4_lck_length(struct file_lock *request)
+{
+ if (request->fl_end == OFFSET_MAX)
+ return ~(uint64_t)0;
+ return request->fl_end - request->fl_start + 1;
+}
+
+static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
+{
+ struct inode *inode = state->inode;
+ struct nfs_server *server = NFS_SERVER(inode);
+ struct nfs4_client *clp = server->nfs4_state;
+ struct nfs_lockargs arg = {
+ .fh = NFS_FH(inode),
+ .type = nfs4_lck_type(cmd, request),
+ .offset = request->fl_start,
+ .length = nfs4_lck_length(request),
+ };
+ struct nfs_lockres res = {
+ .server = server,
+ };
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
+ .rpc_argp = &arg,
+ .rpc_resp = &res,
+ .rpc_cred = state->owner->so_cred,
+ };
+ struct nfs_lowner nlo;
+ struct nfs4_lock_state *lsp;
+ int status;
+
+ down_read(&clp->cl_sem);
+ nlo.clientid = clp->cl_clientid;
+ down(&state->lock_sema);
+ lsp = nfs4_find_lock_state(state, request->fl_owner);
+ if (lsp)
+ nlo.id = lsp->ls_id;
+ else {
+ spin_lock(&clp->cl_lock);
+ nlo.id = nfs4_alloc_lockowner_id(clp);
+ spin_unlock(&clp->cl_lock);
+ }
+ arg.u.lockt = &nlo;
+ status = rpc_call_sync(server->client, &msg, 0);
+ if (!status) {
+ request->fl_type = F_UNLCK;
+ } else if (status == -NFS4ERR_DENIED) {
+ int64_t len, start, end;
+ start = res.u.denied.offset;
+ len = res.u.denied.length;
+ end = start + len - 1;
+ if (end < 0 || len == 0)
+ request->fl_end = OFFSET_MAX;
+ else
+ request->fl_end = (loff_t)end;
+ request->fl_start = (loff_t)start;
+ request->fl_type = F_WRLCK;
+ if (res.u.denied.type & 1)
+ request->fl_type = F_RDLCK;
+ request->fl_pid = 0;
+ status = 0;
+ }
+ if (lsp)
+ nfs4_put_lock_state(lsp);
+ up(&state->lock_sema);
+ up_read(&clp->cl_sem);
+ return status;
+}
+
+static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
+{
+ struct nfs4_exception exception = { };
+ int err;
+
+ do {
+ err = nfs4_handle_exception(NFS_SERVER(state->inode),
+ _nfs4_proc_getlk(state, cmd, request),
+ &exception);
+ } while (exception.retry);
+ return err;
+}
+
+static int do_vfs_lock(struct file *file, struct file_lock *fl)
+{
+ int res = 0;
+ switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
+ case FL_POSIX:
+ res = posix_lock_file_wait(file, fl);
+ break;
+ case FL_FLOCK:
+ res = flock_lock_file_wait(file, fl);
+ break;
+ default:
+ BUG();
+ }
+ if (res < 0)
+ printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
+ __FUNCTION__);
+ return res;
+}
+
+static int _nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
+{
+ struct inode *inode = state->inode;
+ struct nfs_server *server = NFS_SERVER(inode);
+ struct nfs4_client *clp = server->nfs4_state;
+ struct nfs_lockargs arg = {
+ .fh = NFS_FH(inode),
+ .type = nfs4_lck_type(cmd, request),
+ .offset = request->fl_start,
+ .length = nfs4_lck_length(request),
+ };
+ struct nfs_lockres res = {
+ .server = server,
+ };
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
+ .rpc_argp = &arg,
+ .rpc_resp = &res,
+ .rpc_cred = state->owner->so_cred,
+ };
+ struct nfs4_lock_state *lsp;
+ struct nfs_locku_opargs luargs;
+ int status = 0;
+
+ down_read(&clp->cl_sem);
+ down(&state->lock_sema);
+ lsp = nfs4_find_lock_state(state, request->fl_owner);
+ if (!lsp)
+ goto out;
+ /* We might have lost the locks! */
+ if ((lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) {
+ luargs.seqid = lsp->ls_seqid;
+ memcpy(&luargs.stateid, &lsp->ls_stateid, sizeof(luargs.stateid));
+ arg.u.locku = &luargs;
+ status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
+ nfs4_increment_lock_seqid(status, lsp);
+ }
+
+ if (status == 0) {
+ memcpy(&lsp->ls_stateid, &res.u.stateid,
+ sizeof(lsp->ls_stateid));
+ nfs4_notify_unlck(state, request, lsp);
+ }
+ nfs4_put_lock_state(lsp);
+out:
+ up(&state->lock_sema);
+ if (status == 0)
+ do_vfs_lock(request->fl_file, request);
+ up_read(&clp->cl_sem);
+ return status;
+}
+
+static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
+{
+ struct nfs4_exception exception = { };
+ int err;
+
+ do {
+ err = nfs4_handle_exception(NFS_SERVER(state->inode),
+ _nfs4_proc_unlck(state, cmd, request),
+ &exception);
+ } while (exception.retry);
+ return err;
+}
+
+static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *request, int reclaim)
+{
+ struct inode *inode = state->inode;
+ struct nfs_server *server = NFS_SERVER(inode);
+ struct nfs4_lock_state *lsp;
+ struct nfs_lockargs arg = {
+ .fh = NFS_FH(inode),
+ .type = nfs4_lck_type(cmd, request),
+ .offset = request->fl_start,
+ .length = nfs4_lck_length(request),
+ };
+ struct nfs_lockres res = {
+ .server = server,
+ };
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
+ .rpc_argp = &arg,
+ .rpc_resp = &res,
+ .rpc_cred = state->owner->so_cred,
+ };
+ struct nfs_lock_opargs largs = {
+ .reclaim = reclaim,
+ .new_lock_owner = 0,
+ };
+ int status;
+
+ lsp = nfs4_get_lock_state(state, request->fl_owner);
+ if (lsp == NULL)
+ return -ENOMEM;
+ if (!(lsp->ls_flags & NFS_LOCK_INITIALIZED)) {
+ struct nfs4_state_owner *owner = state->owner;
+ struct nfs_open_to_lock otl = {
+ .lock_owner = {
+ .clientid = server->nfs4_state->cl_clientid,
+ },
+ };
+
+ otl.lock_seqid = lsp->ls_seqid;
+ otl.lock_owner.id = lsp->ls_id;
+ memcpy(&otl.open_stateid, &state->stateid, sizeof(otl.open_stateid));
+ largs.u.open_lock = &otl;
+ largs.new_lock_owner = 1;
+ arg.u.lock = &largs;
+ down(&owner->so_sema);
+ otl.open_seqid = owner->so_seqid;
+ status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
+ /* increment open_owner seqid on success, and
+ * seqid mutating errors */
+ nfs4_increment_seqid(status, owner);
+ up(&owner->so_sema);
+ } else {
+ struct nfs_exist_lock el = {
+ .seqid = lsp->ls_seqid,
+ };
+ memcpy(&el.stateid, &lsp->ls_stateid, sizeof(el.stateid));
+ largs.u.exist_lock = &el;
+ largs.new_lock_owner = 0;
+ arg.u.lock = &largs;
+ status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
+ }
+ /* increment seqid on success, and * seqid mutating errors*/
+ nfs4_increment_lock_seqid(status, lsp);
+ /* save the returned stateid. */
+ if (status == 0) {
+ memcpy(&lsp->ls_stateid, &res.u.stateid, sizeof(nfs4_stateid));
+ lsp->ls_flags |= NFS_LOCK_INITIALIZED;
+ if (!reclaim)
+ nfs4_notify_setlk(state, request, lsp);
+ } else if (status == -NFS4ERR_DENIED)
+ status = -EAGAIN;
+ nfs4_put_lock_state(lsp);
+ return status;
+}
+
+static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
+{
+ return _nfs4_do_setlk(state, F_SETLK, request, 1);
+}
+
+static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
+{
+ return _nfs4_do_setlk(state, F_SETLK, request, 0);
+}
+
+static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
+{
+ struct nfs4_client *clp = state->owner->so_client;
+ int status;
+
+ down_read(&clp->cl_sem);
+ down(&state->lock_sema);
+ status = _nfs4_do_setlk(state, cmd, request, 0);
+ up(&state->lock_sema);
+ if (status == 0) {
+ /* Note: we always want to sleep here! */
+ request->fl_flags |= FL_SLEEP;
+ if (do_vfs_lock(request->fl_file, request) < 0)
+ printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
+ }
+ up_read(&clp->cl_sem);
+ return status;
+}
+
+static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
+{
+ struct nfs4_exception exception = { };
+ int err;
+
+ do {
+ err = nfs4_handle_exception(NFS_SERVER(state->inode),
+ _nfs4_proc_setlk(state, cmd, request),
+ &exception);
+ } while (exception.retry);
+ return err;
+}
+
+static int
+nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
+{
+ struct nfs_open_context *ctx;
+ struct nfs4_state *state;
+ unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
+ int status;
+
+ /* verify open state */
+ ctx = (struct nfs_open_context *)filp->private_data;
+ state = ctx->state;
+
+ if (request->fl_start < 0 || request->fl_end < 0)
+ return -EINVAL;
+
+ if (IS_GETLK(cmd))
+ return nfs4_proc_getlk(state, F_GETLK, request);
+
+ if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
+ return -EINVAL;
+
+ if (request->fl_type == F_UNLCK)
+ return nfs4_proc_unlck(state, cmd, request);
+
+ do {
+ status = nfs4_proc_setlk(state, cmd, request);
+ if ((status != -EAGAIN) || IS_SETLK(cmd))
+ break;
+ timeout = nfs4_set_lock_task_retry(timeout);
+ status = -ERESTARTSYS;
+ if (signalled())
+ break;
+ } while(status < 0);
+
+ return status;
+}
+
+struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
+ .recover_open = nfs4_open_reclaim,
+ .recover_lock = nfs4_lock_reclaim,
+};
+
+struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
+ .recover_open = nfs4_open_expired,
+ .recover_lock = nfs4_lock_expired,
+};
+
+struct nfs_rpc_ops nfs_v4_clientops = {
+ .version = 4, /* protocol version */
+ .dentry_ops = &nfs4_dentry_operations,
+ .dir_inode_ops = &nfs4_dir_inode_operations,
+ .getroot = nfs4_proc_get_root,
+ .getattr = nfs4_proc_getattr,
+ .setattr = nfs4_proc_setattr,
+ .lookup = nfs4_proc_lookup,
+ .access = nfs4_proc_access,
+ .readlink = nfs4_proc_readlink,
+ .read = nfs4_proc_read,
+ .write = nfs4_proc_write,
+ .commit = nfs4_proc_commit,
+ .create = nfs4_proc_create,
+ .remove = nfs4_proc_remove,
+ .unlink_setup = nfs4_proc_unlink_setup,
+ .unlink_done = nfs4_proc_unlink_done,
+ .rename = nfs4_proc_rename,
+ .link = nfs4_proc_link,
+ .symlink = nfs4_proc_symlink,
+ .mkdir = nfs4_proc_mkdir,
+ .rmdir = nfs4_proc_remove,
+ .readdir = nfs4_proc_readdir,
+ .mknod = nfs4_proc_mknod,
+ .statfs = nfs4_proc_statfs,
+ .fsinfo = nfs4_proc_fsinfo,
+ .pathconf = nfs4_proc_pathconf,
+ .decode_dirent = nfs4_decode_dirent,
+ .read_setup = nfs4_proc_read_setup,
+ .write_setup = nfs4_proc_write_setup,
+ .commit_setup = nfs4_proc_commit_setup,
+ .file_open = nfs4_proc_file_open,
+ .file_release = nfs4_proc_file_release,
+ .lock = nfs4_proc_lock,
+};
+
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */