18 files changed, 178 insertions, 104 deletions

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 0c42cdbabecf..49d0b43458b7 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -33,6 +33,7 @@
 #include <linux/elf.h>
 #include <linux/utsname.h>
 #include <linux/coredump.h>
+#include <linux/sched.h>
 #include <asm/uaccess.h>
 #include <asm/param.h>
 #include <asm/page.h>
@@ -1320,8 +1321,11 @@ static void fill_prstatus(struct elf_prstatus *prstatus,
                 cputime_to_timeval(cputime.utime, &prstatus->pr_utime);
                 cputime_to_timeval(cputime.stime, &prstatus->pr_stime);
         } else {
-                cputime_to_timeval(p->utime, &prstatus->pr_utime);
-                cputime_to_timeval(p->stime, &prstatus->pr_stime);
+                cputime_t utime, stime;
+
+                task_cputime(p, &utime, &stime);
+                cputime_to_timeval(utime, &prstatus->pr_utime);
+                cputime_to_timeval(stime, &prstatus->pr_stime);
         }
         cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime);
         cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime);
diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index dc84732e554f..cb240dd3b402 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -1375,8 +1375,11 @@ static void fill_prstatus(struct elf_prstatus *prstatus,
                 cputime_to_timeval(cputime.utime, &prstatus->pr_utime);
                 cputime_to_timeval(cputime.stime, &prstatus->pr_stime);
         } else {
-                cputime_to_timeval(p->utime, &prstatus->pr_utime);
-                cputime_to_timeval(p->stime, &prstatus->pr_stime);
+                cputime_t utime, stime;
+
+                task_cputime(p, &utime, &stime);
+                cputime_to_timeval(utime, &prstatus->pr_utime);
+                cputime_to_timeval(stime, &prstatus->pr_stime);
         }
         cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime);
         cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime);
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index a8b8adc05070..5a3327b8f90d 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -4534,7 +4534,7 @@ int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes)
         unsigned nr_extents = 0;
         int extra_reserve = 0;
         enum btrfs_reserve_flush_enum flush = BTRFS_RESERVE_FLUSH_ALL;
-        int ret;
+        int ret = 0;
         bool delalloc_lock = true;
 
         /* If we are a free space inode we need to not flush since we will be in
@@ -4579,20 +4579,18 @@ int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes)
         csum_bytes = BTRFS_I(inode)->csum_bytes;
         spin_unlock(&BTRFS_I(inode)->lock);
 
-        if (root->fs_info->quota_enabled) {
+        if (root->fs_info->quota_enabled)
                 ret = btrfs_qgroup_reserve(root, num_bytes +
                                            nr_extents * root->leafsize);
-                if (ret) {
-                        spin_lock(&BTRFS_I(inode)->lock);
-                        calc_csum_metadata_size(inode, num_bytes, 0);
-                        spin_unlock(&BTRFS_I(inode)->lock);
-                        if (delalloc_lock)
-                                mutex_unlock(&BTRFS_I(inode)->delalloc_mutex);
-                        return ret;
-                }
-        }
 
-        ret = reserve_metadata_bytes(root, block_rsv, to_reserve, flush);
+        /*
+         * ret != 0 here means the qgroup reservation failed, we go straight to
+         * the shared error handling then.
+         */
+        if (ret == 0)
+                ret = reserve_metadata_bytes(root, block_rsv,
+                                             to_reserve, flush);
+
         if (ret) {
                 u64 to_free = 0;
                 unsigned dropped;
diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index 2e8cae63d247..fdb7a8db3b57 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -288,7 +288,8 @@ out:
 void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em)
 {
         clear_bit(EXTENT_FLAG_LOGGING, &em->flags);
-        try_merge_map(tree, em);
+        if (em->in_tree)
+                try_merge_map(tree, em);
 }
 
 /**
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index f76b1fd160d4..aeb84469d2c4 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -293,15 +293,24 @@ static int __btrfs_run_defrag_inode(struct btrfs_fs_info *fs_info,
         struct btrfs_key key;
         struct btrfs_ioctl_defrag_range_args range;
         int num_defrag;
+        int index;
+        int ret;
 
         /* get the inode */
         key.objectid = defrag->root;
         btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
         key.offset = (u64)-1;
+
+        index = srcu_read_lock(&fs_info->subvol_srcu);
+
         inode_root = btrfs_read_fs_root_no_name(fs_info, &key);
         if (IS_ERR(inode_root)) {
-                kmem_cache_free(btrfs_inode_defrag_cachep, defrag);
-                return PTR_ERR(inode_root);
+                ret = PTR_ERR(inode_root);
+                goto cleanup;
+        }
+        if (btrfs_root_refs(&inode_root->root_item) == 0) {
+                ret = -ENOENT;
+                goto cleanup;
         }
 
         key.objectid = defrag->ino;
@@ -309,9 +318,10 @@ static int __btrfs_run_defrag_inode(struct btrfs_fs_info *fs_info,
         key.offset = 0;
         inode = btrfs_iget(fs_info->sb, &key, inode_root, NULL);
         if (IS_ERR(inode)) {
-                kmem_cache_free(btrfs_inode_defrag_cachep, defrag);
-                return PTR_ERR(inode);
+                ret = PTR_ERR(inode);
+                goto cleanup;
         }
+        srcu_read_unlock(&fs_info->subvol_srcu, index);
 
         /* do a chunk of defrag */
         clear_bit(BTRFS_INODE_IN_DEFRAG, &BTRFS_I(inode)->runtime_flags);
@@ -346,6 +356,10 @@ static int __btrfs_run_defrag_inode(struct btrfs_fs_info *fs_info,
 
         iput(inode);
         return 0;
+cleanup:
+        srcu_read_unlock(&fs_info->subvol_srcu, index);
+        kmem_cache_free(btrfs_inode_defrag_cachep, defrag);
+        return ret;
 }
 
 /*
@@ -1594,9 +1608,10 @@ static ssize_t btrfs_file_aio_write(struct kiocb *iocb,
                 if (err < 0 && num_written > 0)
                         num_written = err;
         }
-out:
+
         if (sync)
                 atomic_dec(&BTRFS_I(inode)->sync_writers);
+out:
         sb_end_write(inode->i_sb);
         current->backing_dev_info = NULL;
         return num_written ? num_written : err;
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 5b22d45d3c6a..338f2597bf7f 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -515,7 +515,6 @@ static noinline int create_subvol(struct btrfs_root *root,
 
         BUG_ON(ret);
 
-        d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry));
 fail:
         if (async_transid) {
                 *async_transid = trans->transid;
@@ -525,6 +524,10 @@ fail:
         }
         if (err && !ret)
                 ret = err;
+
+        if (!ret)
+                d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry));
+
         return ret;
 }
 
diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c
index f10731297040..e5ed56729607 100644
--- a/fs/btrfs/ordered-data.c
+++ b/fs/btrfs/ordered-data.c
@@ -836,9 +836,16 @@ int btrfs_ordered_update_i_size(struct inode *inode, u64 offset,
          * if the disk i_size is already at the inode->i_size, or
          * this ordered extent is inside the disk i_size, we're done
          */
-        if (disk_i_size == i_size || offset <= disk_i_size) {
+        if (disk_i_size == i_size)
+                goto out;
+
+        /*
+         * We still need to update disk_i_size if outstanding_isize is greater
+         * than disk_i_size.
+         */
+        if (offset <= disk_i_size &&
+            (!ordered || ordered->outstanding_isize <= disk_i_size))
                 goto out;
-        }
 
         /*
          * walk backward from this ordered extent to disk_i_size.
@@ -870,7 +877,7 @@ int btrfs_ordered_update_i_size(struct inode *inode, u64 offset,
                         break;
                 if (test->file_offset >= i_size)
                         break;
-                if (test->file_offset >= disk_i_size) {
+                if (entry_end(test) > disk_i_size) {
                         /*
                          * we don't update disk_i_size now, so record this
                          * undealt i_size. Or we will not know the real
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index bdbb94f245c9..67783e03d121 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -580,20 +580,29 @@ static int scrub_fixup_readpage(u64 inum, u64 offset, u64 root, void *fixup_ctx)
         int corrected = 0;
         struct btrfs_key key;
         struct inode *inode = NULL;
+        struct btrfs_fs_info *fs_info;
         u64 end = offset + PAGE_SIZE - 1;
         struct btrfs_root *local_root;
+        int srcu_index;
 
         key.objectid = root;
         key.type = BTRFS_ROOT_ITEM_KEY;
         key.offset = (u64)-1;
-        local_root = btrfs_read_fs_root_no_name(fixup->root->fs_info, &key);
-        if (IS_ERR(local_root))
+
+        fs_info = fixup->root->fs_info;
+        srcu_index = srcu_read_lock(&fs_info->subvol_srcu);
+
+        local_root = btrfs_read_fs_root_no_name(fs_info, &key);
+        if (IS_ERR(local_root)) {
+                srcu_read_unlock(&fs_info->subvol_srcu, srcu_index);
                 return PTR_ERR(local_root);
+        }
 
         key.type = BTRFS_INODE_ITEM_KEY;
         key.objectid = inum;
         key.offset = 0;
-        inode = btrfs_iget(fixup->root->fs_info->sb, &key, local_root, NULL);
+        inode = btrfs_iget(fs_info->sb, &key, local_root, NULL);
+        srcu_read_unlock(&fs_info->subvol_srcu, srcu_index);
         if (IS_ERR(inode))
                 return PTR_ERR(inode);
 
@@ -606,7 +615,6 @@ static int scrub_fixup_readpage(u64 inum, u64 offset, u64 root, void *fixup_ctx)
         }
 
         if (PageUptodate(page)) {
-                struct btrfs_fs_info *fs_info;
                 if (PageDirty(page)) {
                         /*
                          * we need to write the data to the defect sector. the
@@ -3180,18 +3188,25 @@ static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root, void *ctx)
         u64 physical_for_dev_replace;
         u64 len;
         struct btrfs_fs_info *fs_info = nocow_ctx->sctx->dev_root->fs_info;
+        int srcu_index;
 
         key.objectid = root;
         key.type = BTRFS_ROOT_ITEM_KEY;
         key.offset = (u64)-1;
+
+        srcu_index = srcu_read_lock(&fs_info->subvol_srcu);
+
         local_root = btrfs_read_fs_root_no_name(fs_info, &key);
-        if (IS_ERR(local_root))
+        if (IS_ERR(local_root)) {
+                srcu_read_unlock(&fs_info->subvol_srcu, srcu_index);
                 return PTR_ERR(local_root);
+        }
 
         key.type = BTRFS_INODE_ITEM_KEY;
         key.objectid = inum;
         key.offset = 0;
         inode = btrfs_iget(fs_info->sb, &key, local_root, NULL);
+        srcu_read_unlock(&fs_info->subvol_srcu, srcu_index);
         if (IS_ERR(inode))
                 return PTR_ERR(inode);
 
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index f15494699f3b..fc03aa60b684 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -333,12 +333,14 @@ start_transaction(struct btrfs_root *root, u64 num_items, int type,
                                           &root->fs_info->trans_block_rsv,
                                           num_bytes, flush);
                 if (ret)
-                        return ERR_PTR(ret);
+                        goto reserve_fail;
         }
 again:
         h = kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS);
-        if (!h)
-                return ERR_PTR(-ENOMEM);
+        if (!h) {
+                ret = -ENOMEM;
+                goto alloc_fail;
+        }
 
         /*
          * If we are JOIN_NOLOCK we're already committing a transaction and
@@ -365,11 +367,7 @@ again:
         if (ret < 0) {
                 /* We must get the transaction if we are JOIN_NOLOCK. */
                 BUG_ON(type == TRANS_JOIN_NOLOCK);
-
-                if (type < TRANS_JOIN_NOLOCK)
-                        sb_end_intwrite(root->fs_info->sb);
-                kmem_cache_free(btrfs_trans_handle_cachep, h);
-                return ERR_PTR(ret);
+                goto join_fail;
         }
 
         cur_trans = root->fs_info->running_transaction;
@@ -410,6 +408,19 @@ got_it:
         if (!current->journal_info && type != TRANS_USERSPACE)
                 current->journal_info = h;
         return h;
+
+join_fail:
+        if (type < TRANS_JOIN_NOLOCK)
+                sb_end_intwrite(root->fs_info->sb);
+        kmem_cache_free(btrfs_trans_handle_cachep, h);
+alloc_fail:
+        if (num_bytes)
+                btrfs_block_rsv_release(root, &root->fs_info->trans_block_rsv,
+                                        num_bytes);
+reserve_fail:
+        if (qgroup_reserved)
+                btrfs_qgroup_free(root, qgroup_reserved);
+        return ERR_PTR(ret);
 }
 
 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 15f6efdf6463..5cbb7f4b1672 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1556,7 +1556,8 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
         ret = 0;
 
         /* Notify udev that device has changed */
-        btrfs_kobject_uevent(bdev, KOBJ_CHANGE);
+        if (bdev)
+                btrfs_kobject_uevent(bdev, KOBJ_CHANGE);
 
 error_brelse:
         brelse(bh);
diff --git a/fs/dlm/user.c b/fs/dlm/user.c
index 7ff49852b0cb..911649a47dd5 100644
--- a/fs/dlm/user.c
+++ b/fs/dlm/user.c
@@ -503,11 +503,11 @@ static ssize_t device_write(struct file *file, const char __user *buf,
 #endif
                 return -EINVAL;
 
-#ifdef CONFIG_COMPAT
-        if (count > sizeof(struct dlm_write_request32) + DLM_RESNAME_MAXLEN)
-#else
+        /*
+         * can't compare against COMPAT/dlm_write_request32 because
+         * we don't yet know if is64bit is zero
+         */
         if (count > sizeof(struct dlm_write_request) + DLM_RESNAME_MAXLEN)
-#endif
                 return -EINVAL;
 
         kbuf = kzalloc(count + 1, GFP_NOFS);
diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index dd057bc6b65b..fc8dc20fdeb9 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -177,11 +177,31 @@ out_nofree:
         return mnt;
 }
 
+static int
+nfs_namespace_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
+{
+        if (NFS_FH(dentry->d_inode)->size != 0)
+                return nfs_getattr(mnt, dentry, stat);
+        generic_fillattr(dentry->d_inode, stat);
+        return 0;
+}
+
+static int
+nfs_namespace_setattr(struct dentry *dentry, struct iattr *attr)
+{
+        if (NFS_FH(dentry->d_inode)->size != 0)
+                return nfs_setattr(dentry, attr);
+        return -EACCES;
+}
+
 const struct inode_operations nfs_mountpoint_inode_operations = {
         .getattr        = nfs_getattr,
+        .setattr        = nfs_setattr,
 };
 
 const struct inode_operations nfs_referral_inode_operations = {
+        .getattr        = nfs_namespace_getattr,
+        .setattr        = nfs_namespace_setattr,
 };
 
 static void nfs_expire_automounts(struct work_struct *work)
diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c
index acc347268124..2e9779b58b7a 100644
--- a/fs/nfs/nfs4client.c
+++ b/fs/nfs/nfs4client.c
@@ -236,11 +236,10 @@ struct nfs_client *nfs4_init_client(struct nfs_client *clp,
         error = nfs4_discover_server_trunking(clp, &old);
         if (error < 0)
                 goto error;
+        nfs_put_client(clp);
         if (clp != old) {
                 clp->cl_preserve_clid = true;
-                nfs_put_client(clp);
                 clp = old;
-                atomic_inc(&clp->cl_count);
         }
 
         return clp;
@@ -306,7 +305,7 @@ int nfs40_walk_client_list(struct nfs_client *new,
                 .clientid       = new->cl_clientid,
                 .confirm        = new->cl_confirm,
         };
-        int status;
+        int status = -NFS4ERR_STALE_CLIENTID;
 
         spin_lock(&nn->nfs_client_lock);
         list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) {
@@ -332,40 +331,33 @@ int nfs40_walk_client_list(struct nfs_client *new,
 
                 if (prev)
                         nfs_put_client(prev);
+                prev = pos;
 
                 status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
-                if (status == 0) {
+                switch (status) {
+                case -NFS4ERR_STALE_CLIENTID:
+                        break;
+                case 0:
                         nfs4_swap_callback_idents(pos, new);
 
-                        nfs_put_client(pos);
+                        prev = NULL;
                         *result = pos;
                         dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
                                 __func__, pos, atomic_read(&pos->cl_count));
-                        return 0;
-                }
-                if (status != -NFS4ERR_STALE_CLIENTID) {
-                        nfs_put_client(pos);
-                        dprintk("NFS: <-- %s status = %d, no result\n",
-                                __func__, status);
-                        return status;
+                default:
+                        goto out;
                 }
 
                 spin_lock(&nn->nfs_client_lock);
-                prev = pos;
         }
+        spin_unlock(&nn->nfs_client_lock);
 
-        /*
-         * No matching nfs_client found.  This should be impossible,
-         * because the new nfs_client has already been added to
-         * nfs_client_list by nfs_get_client().
-         *
-         * Don't BUG(), since the caller is holding a mutex.
-         */
+        /* No match found. The server lost our clientid */
+out:
         if (prev)
                 nfs_put_client(prev);
-        spin_unlock(&nn->nfs_client_lock);
-        pr_err("NFS: %s Error: no matching nfs_client found\n", __func__);
-        return -NFS4ERR_STALE_CLIENTID;
+        dprintk("NFS: <-- %s status = %d\n", __func__, status);
+        return status;
 }
 
 #ifdef CONFIG_NFS_V4_1
@@ -432,7 +424,7 @@ int nfs41_walk_client_list(struct nfs_client *new,
 {
         struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
         struct nfs_client *pos, *n, *prev = NULL;
-        int error;
+        int status = -NFS4ERR_STALE_CLIENTID;
 
         spin_lock(&nn->nfs_client_lock);
         list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) {
@@ -448,14 +440,17 @@ int nfs41_walk_client_list(struct nfs_client *new,
                                 nfs_put_client(prev);
                         prev = pos;
 
-                        error = nfs_wait_client_init_complete(pos);
-                        if (error < 0) {
+                        nfs4_schedule_lease_recovery(pos);
+                        status = nfs_wait_client_init_complete(pos);
+                        if (status < 0) {
                                 nfs_put_client(pos);
                                 spin_lock(&nn->nfs_client_lock);
                                 continue;
                         }
-
+                        status = pos->cl_cons_state;
                         spin_lock(&nn->nfs_client_lock);
+                        if (status < 0)
+                                continue;
                 }
 
                 if (pos->rpc_ops != new->rpc_ops)
@@ -473,6 +468,7 @@ int nfs41_walk_client_list(struct nfs_client *new,
                 if (!nfs4_match_serverowners(pos, new))
                         continue;
 
+                atomic_inc(&pos->cl_count);
                 spin_unlock(&nn->nfs_client_lock);
                 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
                         __func__, pos, atomic_read(&pos->cl_count));
@@ -481,16 +477,10 @@ int nfs41_walk_client_list(struct nfs_client *new,
                 return 0;
         }
 
-        /*
-         * No matching nfs_client found.  This should be impossible,
-         * because the new nfs_client has already been added to
-         * nfs_client_list by nfs_get_client().
-         *
-         * Don't BUG(), since the caller is holding a mutex.
-         */
+        /* No matching nfs_client found. */
         spin_unlock(&nn->nfs_client_lock);
-        pr_err("NFS: %s Error: no matching nfs_client found\n", __func__);
-        return -NFS4ERR_STALE_CLIENTID;
+        dprintk("NFS: <-- %s status = %d\n", __func__, status);
+        return status;
 }
 #endif  /* CONFIG_NFS_V4_1 */
 
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 9448c579d41a..e61f68d5ef21 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -136,16 +136,11 @@ int nfs40_discover_server_trunking(struct nfs_client *clp,
         clp->cl_confirm = clid.confirm;
 
         status = nfs40_walk_client_list(clp, result, cred);
-        switch (status) {
-        case -NFS4ERR_STALE_CLIENTID:
-                set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
-        case 0:
+        if (status == 0) {
                 /* Sustain the lease, even if it's empty.  If the clientid4
                  * goes stale it's of no use for trunking discovery. */
                 nfs4_schedule_state_renewal(*result);
-                break;
         }
-
 out:
         return status;
 }
@@ -1863,6 +1858,7 @@ again:
         case -ETIMEDOUT:
         case -EAGAIN:
                 ssleep(1);
+        case -NFS4ERR_STALE_CLIENTID:
                 dprintk("NFS: %s after status %d, retrying\n",
                         __func__, status);
                 goto again;
@@ -2022,8 +2018,18 @@ static int nfs4_reset_session(struct nfs_client *clp)
         nfs4_begin_drain_session(clp);
         cred = nfs4_get_exchange_id_cred(clp);
         status = nfs4_proc_destroy_session(clp->cl_session, cred);
-        if (status && status != -NFS4ERR_BADSESSION &&
-            status != -NFS4ERR_DEADSESSION) {
+        switch (status) {
+        case 0:
+        case -NFS4ERR_BADSESSION:
+        case -NFS4ERR_DEADSESSION:
+                break;
+        case -NFS4ERR_BACK_CHAN_BUSY:
+        case -NFS4ERR_DELAY:
+                set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
+                status = 0;
+                ssleep(1);
+                goto out;
+        default:
                 status = nfs4_recovery_handle_error(clp, status);
                 goto out;
         }
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 2e7e8c878e5d..b056b1628722 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -2589,27 +2589,23 @@ nfs_xdev_mount(struct file_system_type *fs_type, int flags,
         struct nfs_server *server;
         struct dentry *mntroot = ERR_PTR(-ENOMEM);
         struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
-        int error;
 
-        dprintk("--> nfs_xdev_mount_common()\n");
+        dprintk("--> nfs_xdev_mount()\n");
 
         mount_info.mntfh = mount_info.cloned->fh;
 
         /* create a new volume representation */
         server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
-        if (IS_ERR(server)) {
-                error = PTR_ERR(server);
-                goto out_err;
-        }
 
-        mntroot = nfs_fs_mount_common(server, flags, dev_name, &mount_info, nfs_mod);
-        dprintk("<-- nfs_xdev_mount_common() = 0\n");
-out:
-        return mntroot;
+        if (IS_ERR(server))
+                mntroot = ERR_CAST(server);
+        else
+                mntroot = nfs_fs_mount_common(server, flags,
+                                dev_name, &mount_info, nfs_mod);
 
-out_err:
-        dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error);
-        goto out;
+        dprintk("<-- nfs_xdev_mount() = %ld\n",
+                        IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
+        return mntroot;
 }
 
 #if IS_ENABLED(CONFIG_NFS_V4)
diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
index fdb180769485..f3859354e41a 100644
--- a/fs/nilfs2/ioctl.c
+++ b/fs/nilfs2/ioctl.c
@@ -664,8 +664,11 @@ static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
         if (ret < 0)
                 printk(KERN_ERR "NILFS: GC failed during preparation: "
                         "cannot read source blocks: err=%d\n", ret);
-        else
+        else {
+                if (nilfs_sb_need_update(nilfs))
+                        set_nilfs_discontinued(nilfs);
                 ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
+        }
 
         nilfs_remove_all_gcinodes(nilfs);
         clear_nilfs_gc_running(nilfs);
diff --git a/fs/proc/array.c b/fs/proc/array.c
index 6a91e6ffbcbd..f7ed9ee46eb9 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -449,7 +449,7 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
                         do {
                                 min_flt += t->min_flt;
                                 maj_flt += t->maj_flt;
-                                gtime += t->gtime;
+                                gtime += task_gtime(t);
                                 t = next_thread(t);
                         } while (t != task);
 
@@ -472,7 +472,7 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
                 min_flt = task->min_flt;
                 maj_flt = task->maj_flt;
                 task_cputime_adjusted(task, &utime, &stime);
-                gtime = task->gtime;
+                gtime = task_gtime(task);
         }
 
         /* scale priority and nice values from timeslices to -20..20 */
diff --git a/fs/select.c b/fs/select.c
index 2ef72d965036..8c1c96c27062 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -26,6 +26,7 @@
 #include <linux/fs.h>
 #include <linux/rcupdate.h>
 #include <linux/hrtimer.h>
+#include <linux/sched/rt.h>
 
 #include <asm/uaccess.h>