11 files changed, 84 insertions, 78 deletions

diff --git a/fs/9p/fid.c b/fs/9p/fid.c
index 0ee594569dcc..85b67ffa2a43 100644
--- a/fs/9p/fid.c
+++ b/fs/9p/fid.c
@@ -286,11 +286,9 @@ static struct p9_fid *v9fs_fid_clone_with_uid(struct dentry *dentry, uid_t uid)
 
 struct p9_fid *v9fs_writeback_fid(struct dentry *dentry)
 {
-        int err, flags;
+        int err;
         struct p9_fid *fid;
-        struct v9fs_session_info *v9ses;
 
-        v9ses = v9fs_dentry2v9ses(dentry);
         fid = v9fs_fid_clone_with_uid(dentry, 0);
         if (IS_ERR(fid))
                 goto error_out;
@@ -299,17 +297,8 @@ struct p9_fid *v9fs_writeback_fid(struct dentry *dentry)
          * dirty pages. We always request for the open fid in read-write
          * mode so that a partial page write which result in page
          * read can work.
-         *
-         * we don't have a tsyncfs operation for older version
-         * of protocol. So make sure the write back fid is
-         * opened in O_SYNC mode.
          */
-        if (!v9fs_proto_dotl(v9ses))
-                flags = O_RDWR | O_SYNC;
-        else
-                flags = O_RDWR;
-
-        err = p9_client_open(fid, flags);
+        err = p9_client_open(fid, O_RDWR);
         if (err < 0) {
                 p9_client_clunk(fid);
                 fid = ERR_PTR(err);
diff --git a/fs/9p/v9fs.h b/fs/9p/v9fs.h
index 9665c2b840e6..e5ebedfc5ed8 100644
--- a/fs/9p/v9fs.h
+++ b/fs/9p/v9fs.h
@@ -116,7 +116,6 @@ struct v9fs_session_info {
         struct list_head slist; /* list of sessions registered with v9fs */
         struct backing_dev_info bdi;
         struct rw_semaphore rename_sem;
-        struct p9_fid *root_fid; /* Used for file system sync */
 };
 
 /* cache_validity flags */
diff --git a/fs/9p/vfs_dentry.c b/fs/9p/vfs_dentry.c
index b6a3b9f7fe4d..e022890c6f40 100644
--- a/fs/9p/vfs_dentry.c
+++ b/fs/9p/vfs_dentry.c
@@ -126,7 +126,9 @@ static int v9fs_lookup_revalidate(struct dentry *dentry, struct nameidata *nd)
                         retval = v9fs_refresh_inode_dotl(fid, inode);
                 else
                         retval = v9fs_refresh_inode(fid, inode);
-                if (retval <= 0)
+                if (retval == -ENOENT)
+                        return 0;
+                if (retval < 0)
                         return retval;
         }
 out_valid:
diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c
index ffbb113d5f33..82a7c38ddad0 100644
--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -811,7 +811,7 @@ v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
         fid = v9fs_fid_lookup(dentry);
         if (IS_ERR(fid)) {
                 __putname(link);
-                link = ERR_PTR(PTR_ERR(fid));
+                link = ERR_CAST(fid);
                 goto ndset;
         }
         retval = p9_client_readlink(fid, &target);
diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c
index f3eed3383e4f..feef6cdc1fd2 100644
--- a/fs/9p/vfs_super.c
+++ b/fs/9p/vfs_super.c
@@ -154,6 +154,7 @@ static struct dentry *v9fs_mount(struct file_system_type *fs_type, int flags,
                 retval = PTR_ERR(inode);
                 goto release_sb;
         }
+
         root = d_alloc_root(inode);
         if (!root) {
                 iput(inode);
@@ -185,21 +186,10 @@ static struct dentry *v9fs_mount(struct file_system_type *fs_type, int flags,
                 p9stat_free(st);
                 kfree(st);
         }
-        v9fs_fid_add(root, fid);
         retval = v9fs_get_acl(inode, fid);
         if (retval)
                 goto release_sb;
-        /*
-         * Add the root fid to session info. This is used
-         * for file system sync. We want a cloned fid here
-         * so that we can do a sync_filesystem after a
-         * shrink_dcache_for_umount
-         */
-        v9ses->root_fid = v9fs_fid_clone(root);
-        if (IS_ERR(v9ses->root_fid)) {
-                retval = PTR_ERR(v9ses->root_fid);
-                goto release_sb;
-        }
+        v9fs_fid_add(root, fid);
 
         P9_DPRINTK(P9_DEBUG_VFS, " simple set mount, return 0\n");
         return dget(sb->s_root);
@@ -210,11 +200,15 @@ close_session:
         v9fs_session_close(v9ses);
         kfree(v9ses);
         return ERR_PTR(retval);
+
 release_sb:
         /*
-         * we will do the session_close and root dentry
-         * release in the below call.
+         * we will do the session_close and root dentry release
+         * in the below call. But we need to clunk fid, because we haven't
+         * attached the fid to dentry so it won't get clunked
+         * automatically.
          */
+        p9_client_clunk(fid);
         deactivate_locked_super(sb);
         return ERR_PTR(retval);
 }
@@ -232,7 +226,7 @@ static void v9fs_kill_super(struct super_block *s)
         P9_DPRINTK(P9_DEBUG_VFS, " %p\n", s);
 
         kill_anon_super(s);
-        p9_client_clunk(v9ses->root_fid);
+
         v9fs_session_cancel(v9ses);
         v9fs_session_close(v9ses);
         kfree(v9ses);
@@ -285,14 +279,6 @@ done:
         return res;
 }
 
-static int v9fs_sync_fs(struct super_block *sb, int wait)
-{
-        struct v9fs_session_info *v9ses = sb->s_fs_info;
-
-        P9_DPRINTK(P9_DEBUG_VFS, "v9fs_sync_fs: super_block %p\n", sb);
-        return p9_client_sync_fs(v9ses->root_fid);
-}
-
 static int v9fs_drop_inode(struct inode *inode)
 {
         struct v9fs_session_info *v9ses;
@@ -307,6 +293,51 @@ static int v9fs_drop_inode(struct inode *inode)
         return 1;
 }
 
+static int v9fs_write_inode(struct inode *inode,
+                            struct writeback_control *wbc)
+{
+        int ret;
+        struct p9_wstat wstat;
+        struct v9fs_inode *v9inode;
+        /*
+         * send an fsync request to server irrespective of
+         * wbc->sync_mode.
+         */
+        P9_DPRINTK(P9_DEBUG_VFS, "%s: inode %p\n", __func__, inode);
+        v9inode = V9FS_I(inode);
+        if (!v9inode->writeback_fid)
+                return 0;
+        v9fs_blank_wstat(&wstat);
+
+        ret = p9_client_wstat(v9inode->writeback_fid, &wstat);
+        if (ret < 0) {
+                __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
+                return ret;
+        }
+        return 0;
+}
+
+static int v9fs_write_inode_dotl(struct inode *inode,
+                                 struct writeback_control *wbc)
+{
+        int ret;
+        struct v9fs_inode *v9inode;
+        /*
+         * send an fsync request to server irrespective of
+         * wbc->sync_mode.
+         */
+        P9_DPRINTK(P9_DEBUG_VFS, "%s: inode %p\n", __func__, inode);
+        v9inode = V9FS_I(inode);
+        if (!v9inode->writeback_fid)
+                return 0;
+        ret = p9_client_fsync(v9inode->writeback_fid, 0);
+        if (ret < 0) {
+                __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
+                return ret;
+        }
+        return 0;
+}
+
 static const struct super_operations v9fs_super_ops = {
         .alloc_inode = v9fs_alloc_inode,
         .destroy_inode = v9fs_destroy_inode,
@@ -314,17 +345,18 @@ static const struct super_operations v9fs_super_ops = {
         .evict_inode = v9fs_evict_inode,
         .show_options = generic_show_options,
         .umount_begin = v9fs_umount_begin,
+        .write_inode = v9fs_write_inode,
 };
 
 static const struct super_operations v9fs_super_ops_dotl = {
         .alloc_inode = v9fs_alloc_inode,
         .destroy_inode = v9fs_destroy_inode,
-        .sync_fs = v9fs_sync_fs,
         .statfs = v9fs_statfs,
         .drop_inode = v9fs_drop_inode,
         .evict_inode = v9fs_evict_inode,
         .show_options = generic_show_options,
         .umount_begin = v9fs_umount_begin,
+        .write_inode = v9fs_write_inode_dotl,
 };
 
 struct file_system_type v9fs_fs_type = {
diff --git a/include/net/9p/9p.h b/include/net/9p/9p.h
index cdf2e8ac4309..d2df55b0c213 100644
--- a/include/net/9p/9p.h
+++ b/include/net/9p/9p.h
@@ -139,8 +139,6 @@ do { \
  */
 
 enum p9_msg_t {
-        P9_TSYNCFS = 0,
-        P9_RSYNCFS,
         P9_TLERROR = 6,
         P9_RLERROR,
         P9_TSTATFS = 8,
diff --git a/include/net/9p/client.h b/include/net/9p/client.h
index 85c1413f054d..051a99f79769 100644
--- a/include/net/9p/client.h
+++ b/include/net/9p/client.h
@@ -218,8 +218,8 @@ void p9_client_disconnect(struct p9_client *clnt);
 void p9_client_begin_disconnect(struct p9_client *clnt);
 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
                                         char *uname, u32 n_uname, char *aname);
-struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
-                                                                int clone);
+struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
+                char **wnames, int clone);
 int p9_client_open(struct p9_fid *fid, int mode);
 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
                                                         char *extension);
@@ -230,7 +230,6 @@ int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
                 gid_t gid, struct p9_qid *qid);
 int p9_client_clunk(struct p9_fid *fid);
 int p9_client_fsync(struct p9_fid *fid, int datasync);
-int p9_client_sync_fs(struct p9_fid *fid);
 int p9_client_remove(struct p9_fid *fid);
 int p9_client_read(struct p9_fid *fid, char *data, char __user *udata,
                                                         u64 offset, u32 count);
diff --git a/net/9p/client.c b/net/9p/client.c
index 48b8e084e710..77367745be9b 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -929,15 +929,15 @@ error:
 }
 EXPORT_SYMBOL(p9_client_attach);
 
-struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
-        int clone)
+struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
+                char **wnames, int clone)
 {
         int err;
         struct p9_client *clnt;
         struct p9_fid *fid;
         struct p9_qid *wqids;
         struct p9_req_t *req;
-        int16_t nwqids, count;
+        uint16_t nwqids, count;
 
         err = 0;
         wqids = NULL;
@@ -955,7 +955,7 @@ struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
                 fid = oldfid;
 
 
-        P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n",
+        P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
                 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
 
         req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
@@ -1220,27 +1220,6 @@ error:
 }
 EXPORT_SYMBOL(p9_client_fsync);
 
-int p9_client_sync_fs(struct p9_fid *fid)
-{
-        int err = 0;
-        struct p9_req_t *req;
-        struct p9_client *clnt;
-
-        P9_DPRINTK(P9_DEBUG_9P, ">>> TSYNC_FS fid %d\n", fid->fid);
-
-        clnt = fid->clnt;
-        req = p9_client_rpc(clnt, P9_TSYNCFS, "d", fid->fid);
-        if (IS_ERR(req)) {
-                err = PTR_ERR(req);
-                goto error;
-        }
-        P9_DPRINTK(P9_DEBUG_9P, "<<< RSYNCFS fid %d\n", fid->fid);
-        p9_free_req(clnt, req);
-error:
-        return err;
-}
-EXPORT_SYMBOL(p9_client_sync_fs);
-
 int p9_client_clunk(struct p9_fid *fid)
 {
         int err;
diff --git a/net/9p/protocol.c b/net/9p/protocol.c
index 8a4084fa8b5a..b58a501cf3d1 100644
--- a/net/9p/protocol.c
+++ b/net/9p/protocol.c
@@ -265,7 +265,7 @@ p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt,
                         }
                         break;
                 case 'T':{
-                                int16_t *nwname = va_arg(ap, int16_t *);
+                                uint16_t *nwname = va_arg(ap, uint16_t *);
                                 char ***wnames = va_arg(ap, char ***);
 
                                 errcode = p9pdu_readf(pdu, proto_version,
@@ -468,7 +468,8 @@ p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt,
                 case 'E':{
                                  int32_t cnt = va_arg(ap, int32_t);
                                  const char *k = va_arg(ap, const void *);
-                                 const char *u = va_arg(ap, const void *);
+                                 const char __user *u = va_arg(ap,
+                                                        const void __user *);
                                  errcode = p9pdu_writef(pdu, proto_version, "d",
                                                  cnt);
                                  if (!errcode && pdu_write_urw(pdu, k, u, cnt))
@@ -495,7 +496,7 @@ p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt,
                         }
                         break;
                 case 'T':{
-                                int16_t nwname = va_arg(ap, int);
+                                uint16_t nwname = va_arg(ap, int);
                                 const char **wnames = va_arg(ap, const char **);
 
                                 errcode = p9pdu_writef(pdu, proto_version, "w",
diff --git a/net/9p/trans_common.c b/net/9p/trans_common.c
index d47880e971dd..e883172f9aa2 100644
--- a/net/9p/trans_common.c
+++ b/net/9p/trans_common.c
@@ -66,7 +66,7 @@ p9_payload_gup(struct p9_req_t *req, size_t *pdata_off, int *pdata_len,
         uint32_t pdata_mapped_pages;
         struct trans_rpage_info  *rpinfo;
 
-        *pdata_off = (size_t)req->tc->pubuf & (PAGE_SIZE-1);
+        *pdata_off = (__force size_t)req->tc->pubuf & (PAGE_SIZE-1);
 
         if (*pdata_off)
                 first_page_bytes = min(((size_t)PAGE_SIZE - *pdata_off),
diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index e8f046b07182..244e70742183 100644
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -326,8 +326,11 @@ req_retry_pinned:
                         outp = pack_sg_list_p(chan->sg, out, VIRTQUEUE_NUM,
                                         pdata_off, rpinfo->rp_data, pdata_len);
                 } else {
-                        char *pbuf = req->tc->pubuf ? req->tc->pubuf :
-                                                                req->tc->pkbuf;
+                        char *pbuf;
+                        if (req->tc->pubuf)
+                                pbuf = (__force char *) req->tc->pubuf;
+                        else
+                                pbuf = req->tc->pkbuf;
                         outp = pack_sg_list(chan->sg, out, VIRTQUEUE_NUM, pbuf,
                                         req->tc->pbuf_size);
                 }
@@ -352,8 +355,12 @@ req_retry_pinned:
                         in = pack_sg_list_p(chan->sg, out+inp, VIRTQUEUE_NUM,
                                         pdata_off, rpinfo->rp_data, pdata_len);
                 } else {
-                        char *pbuf = req->tc->pubuf ? req->tc->pubuf :
-                                                                req->tc->pkbuf;
+                        char *pbuf;
+                        if (req->tc->pubuf)
+                                pbuf = (__force char *) req->tc->pubuf;
+                        else
+                                pbuf = req->tc->pkbuf;
+
                         in = pack_sg_list(chan->sg, out+inp, VIRTQUEUE_NUM,
                                         pbuf, req->tc->pbuf_size);
                 }