[PATCH AUTOSEL 5.5 009/542] nfsd4: avoid NULL deference on strange COPY compounds

[PATCH AUTOSEL 5.5 009/542] nfsd4: avoid NULL deference on strange COPY compounds

[Sasha Levin]

From: "J. Bruce Fields" <bfields@redhat.com>

[ Upstream commit d781e3df710745fbbaee4eb07fd5b64331a1b175 ]

With cross-server COPY we've introduced the possibility that the current
or saved filehandle might not have fh_dentry/fh_export filled in, but we
missed a place that assumed it was.  I think this could be triggered by
a compound like:

	PUTFH(foreign filehandle)
	GETATTR
	SAVEFH
	COPY

First, check_if_stalefh_allowed sets no_verify on the first (PUTFH) op.
Then op_func = nfsd4_putfh runs and leaves current_fh->fh_export NULL.
need_wrongsec_check returns true, since this PUTFH has OP_IS_PUTFH_LIKE
set and GETATTR does not have OP_HANDLES_WRONGSEC set.

We should probably also consider tightening the checks in
check_if_stalefh_allowed and double-checking that we don't assume the
filehandle is verified elsewhere in the compound.  But I think this
fixes the immediate issue.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: 4e48f1cccab3 "NFSD: allow inter server COPY to have... "
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/nfsd/nfs4proc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 4798667af647c..4d1d0bf8e385f 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -2025,7 +2025,8 @@ nfsd4_proc_compound(struct svc_rqst *rqstp)
 			if (op->opdesc->op_flags & OP_CLEAR_STATEID)
 				clear_current_stateid(cstate);
 
-			if (need_wrongsec_check(rqstp))
+			if (current_fh->fh_export &&
+					need_wrongsec_check(rqstp))
 				op->status = check_nfsd_access(current_fh->fh_export, rqstp);
 		}
 encode_op:
-- 
2.20.1

[PATCH AUTOSEL 5.5 077/542] nfs: NFS_SWAP should depend on SWAP

[Sasha Levin]

From: Geert Uytterhoeven <geert+renesas@glider.be>

[ Upstream commit 474c4f306eefbb21b67ebd1de802d005c7d7ecdc ]

If CONFIG_SWAP=n, it does not make much sense to offer the user the
option to enable support for swapping over NFS, as that will still fail
at run time:

    # swapon /swap
    swapon: /swap: swapon failed: Function not implemented

Fix this by adding a dependency on CONFIG_SWAP.

Fixes: a564b8f0398636ba ("nfs: enable swap on NFS")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/nfs/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig
index 295a7a21b7744..e7dd07f478259 100644
--- a/fs/nfs/Kconfig
+++ b/fs/nfs/Kconfig
@@ -90,7 +90,7 @@ config NFS_V4
 config NFS_SWAP
 	bool "Provide swap over NFS support"
 	default n
-	depends on NFS_FS
+	depends on NFS_FS && SWAP
 	select SUNRPC_SWAP
 	help
 	  This option enables swapon to work on files located on NFS mounts.
-- 
2.20.1

[PATCH AUTOSEL 5.5 223/542] nfs: fix timstamp debug prints

[Sasha Levin]

From: Arnd Bergmann <arnd@arndb.de>

[ Upstream commit 057f184b1245150b88e59997fc6f1af0e138d42e ]

Starting in v5.5, the timestamps are correctly passed down as
64-bit seconds with NFSv4 on 32-bit machines, but some debug
statements still truncate them to 'long'.

Fixes: e86d5a02874c ("NFS: Convert struct nfs_fattr to use struct timespec64")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/nfs/nfs4xdr.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 936c57779ff4d..728d88b6a698a 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -4097,7 +4097,7 @@ static int decode_attr_time_access(struct xdr_stream *xdr, uint32_t *bitmap, str
 			status = NFS_ATTR_FATTR_ATIME;
 		bitmap[1] &= ~FATTR4_WORD1_TIME_ACCESS;
 	}
-	dprintk("%s: atime=%ld\n", __func__, (long)time->tv_sec);
+	dprintk("%s: atime=%lld\n", __func__, time->tv_sec);
 	return status;
 }
 
@@ -4115,7 +4115,7 @@ static int decode_attr_time_metadata(struct xdr_stream *xdr, uint32_t *bitmap, s
 			status = NFS_ATTR_FATTR_CTIME;
 		bitmap[1] &= ~FATTR4_WORD1_TIME_METADATA;
 	}
-	dprintk("%s: ctime=%ld\n", __func__, (long)time->tv_sec);
+	dprintk("%s: ctime=%lld\n", __func__, time->tv_sec);
 	return status;
 }
 
@@ -4132,8 +4132,8 @@ static int decode_attr_time_delta(struct xdr_stream *xdr, uint32_t *bitmap,
 		status = decode_attr_time(xdr, time);
 		bitmap[1] &= ~FATTR4_WORD1_TIME_DELTA;
 	}
-	dprintk("%s: time_delta=%ld %ld\n", __func__, (long)time->tv_sec,
-		(long)time->tv_nsec);
+	dprintk("%s: time_delta=%lld %ld\n", __func__, time->tv_sec,
+		time->tv_nsec);
 	return status;
 }
 
@@ -4197,7 +4197,7 @@ static int decode_attr_time_modify(struct xdr_stream *xdr, uint32_t *bitmap, str
 			status = NFS_ATTR_FATTR_MTIME;
 		bitmap[1] &= ~FATTR4_WORD1_TIME_MODIFY;
 	}
-	dprintk("%s: mtime=%ld\n", __func__, (long)time->tv_sec);
+	dprintk("%s: mtime=%lld\n", __func__, time->tv_sec);
 	return status;
 }
 
-- 
2.20.1

[PATCH AUTOSEL 5.5 238/542] nfsd: Clone should commit src file metadata too

[Sasha Levin]

From: Trond Myklebust <trondmy@gmail.com>

[ Upstream commit 57f64034966fb945fc958f95f0c51e47af590344 ]

vfs_clone_file_range() can modify the metadata on the source file too,
so we need to commit that to stable storage as well.

Reported-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Acked-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/nfsd/vfs.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index f0bca0e87d0c4..82cf80dde5c71 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -280,19 +280,25 @@ nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name,
  * Commit metadata changes to stable storage.
  */
 static int
-commit_metadata(struct svc_fh *fhp)
+commit_inode_metadata(struct inode *inode)
 {
-	struct inode *inode = d_inode(fhp->fh_dentry);
 	const struct export_operations *export_ops = inode->i_sb->s_export_op;
 
-	if (!EX_ISSYNC(fhp->fh_export))
-		return 0;
-
 	if (export_ops->commit_metadata)
 		return export_ops->commit_metadata(inode);
 	return sync_inode_metadata(inode, 1);
 }
 
+static int
+commit_metadata(struct svc_fh *fhp)
+{
+	struct inode *inode = d_inode(fhp->fh_dentry);
+
+	if (!EX_ISSYNC(fhp->fh_export))
+		return 0;
+	return commit_inode_metadata(inode);
+}
+
 /*
  * Go over the attributes and take care of the small differences between
  * NFS semantics and what Linux expects.
@@ -537,6 +543,9 @@ __be32 nfsd4_clone_file_range(struct file *src, u64 src_pos, struct file *dst,
 	if (sync) {
 		loff_t dst_end = count ? dst_pos + count - 1 : LLONG_MAX;
 		int status = vfs_fsync_range(dst, dst_pos, dst_end, 0);
+
+		if (!status)
+			status = commit_inode_metadata(file_inode(src));
 		if (status < 0)
 			return nfserrno(status);
 	}
-- 
2.20.1

[PATCH AUTOSEL 5.5 366/542] NFS: Revalidate the file size on a fatal write error

[Sasha Levin]

From: Trond Myklebust <trondmy@gmail.com>

[ Upstream commit 0df68ced55443243951d02cc497be31fadf28173 ]

If we suffer a fatal error upon writing a file, which causes us to
need to revalidate the entire mapping, then we should also revalidate
the file size.

Fixes: d2ceb7e57086 ("NFS: Don't use page_file_mapping after removing the page")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/nfs/write.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 52cab65f91cf0..f5170bc839aa2 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -243,7 +243,15 @@ static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int c
 /* A writeback failed: mark the page as bad, and invalidate the page cache */
 static void nfs_set_pageerror(struct address_space *mapping)
 {
+	struct inode *inode = mapping->host;
+
 	nfs_zap_mapping(mapping->host, mapping);
+	/* Force file size revalidation */
+	spin_lock(&inode->i_lock);
+	NFS_I(inode)->cache_validity |= NFS_INO_REVAL_FORCED |
+					NFS_INO_REVAL_PAGECACHE |
+					NFS_INO_INVALID_SIZE;
+	spin_unlock(&inode->i_lock);
 }
 
 static void nfs_mapping_set_error(struct page *page, int error)
-- 
2.20.1

[PATCH AUTOSEL 5.5 367/542] NFS/pnfs: Fix pnfs_generic_prepare_to_resend_writes()

[Sasha Levin]

From: Trond Myklebust <trondmy@gmail.com>

[ Upstream commit 221203ce6406273cf00e5c6397257d986c003ee6 ]

Instead of making assumptions about the commit verifier contents, change
the commit code to ensure we always check that the verifier was set
by the XDR code.

Fixes: f54bcf2ecee9 ("pnfs: Prepare for flexfiles by pulling out common code")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/nfs/direct.c   | 4 ++--
 fs/nfs/nfs3xdr.c  | 5 ++++-
 fs/nfs/nfs4xdr.c  | 5 ++++-
 fs/nfs/pnfs_nfs.c | 7 +++----
 fs/nfs/write.c    | 4 +++-
 5 files changed, 16 insertions(+), 9 deletions(-)

diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index 040a50fd9bf30..29f00da8a0b7f 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -245,10 +245,10 @@ static int nfs_direct_cmp_commit_data_verf(struct nfs_direct_req *dreq,
 					 data->ds_commit_index);
 
 	/* verifier not set so always fail */
-	if (verfp->committed < 0)
+	if (verfp->committed < 0 || data->res.verf->committed <= NFS_UNSTABLE)
 		return 1;
 
-	return nfs_direct_cmp_verf(verfp, &data->verf);
+	return nfs_direct_cmp_verf(verfp, data->res.verf);
 }
 
 /**
diff --git a/fs/nfs/nfs3xdr.c b/fs/nfs/nfs3xdr.c
index 927eb680f1613..69971f6c840d2 100644
--- a/fs/nfs/nfs3xdr.c
+++ b/fs/nfs/nfs3xdr.c
@@ -2334,6 +2334,7 @@ static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
 				   void *data)
 {
 	struct nfs_commitres *result = data;
+	struct nfs_writeverf *verf = result->verf;
 	enum nfs_stat status;
 	int error;
 
@@ -2346,7 +2347,9 @@ static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
 	result->op_status = status;
 	if (status != NFS3_OK)
 		goto out_status;
-	error = decode_writeverf3(xdr, &result->verf->verifier);
+	error = decode_writeverf3(xdr, &verf->verifier);
+	if (!error)
+		verf->committed = NFS_FILE_SYNC;
 out:
 	return error;
 out_status:
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 728d88b6a698a..dc6b9c2f36b2a 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -4313,11 +4313,14 @@ static int decode_write_verifier(struct xdr_stream *xdr, struct nfs_write_verifi
 
 static int decode_commit(struct xdr_stream *xdr, struct nfs_commitres *res)
 {
+	struct nfs_writeverf *verf = res->verf;
 	int status;
 
 	status = decode_op_hdr(xdr, OP_COMMIT);
 	if (!status)
-		status = decode_write_verifier(xdr, &res->verf->verifier);
+		status = decode_write_verifier(xdr, &verf->verifier);
+	if (!status)
+		verf->committed = NFS_FILE_SYNC;
 	return status;
 }
 
diff --git a/fs/nfs/pnfs_nfs.c b/fs/nfs/pnfs_nfs.c
index 82af4809b869a..8b37e7f8e789f 100644
--- a/fs/nfs/pnfs_nfs.c
+++ b/fs/nfs/pnfs_nfs.c
@@ -31,12 +31,11 @@ EXPORT_SYMBOL_GPL(pnfs_generic_rw_release);
 /* Fake up some data that will cause nfs_commit_release to retry the writes. */
 void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data)
 {
-	struct nfs_page *first = nfs_list_entry(data->pages.next);
+	struct nfs_writeverf *verf = data->res.verf;
 
 	data->task.tk_status = 0;
-	memcpy(&data->verf.verifier, &first->wb_verf,
-	       sizeof(data->verf.verifier));
-	data->verf.verifier.data[0]++; /* ensure verifier mismatch */
+	memset(&verf->verifier, 0, sizeof(verf->verifier));
+	verf->committed = NFS_UNSTABLE;
 }
 EXPORT_SYMBOL_GPL(pnfs_generic_prepare_to_resend_writes);
 
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index f5170bc839aa2..913eb37c249bb 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -1837,6 +1837,7 @@ static void nfs_commit_done(struct rpc_task *task, void *calldata)
 
 static void nfs_commit_release_pages(struct nfs_commit_data *data)
 {
+	const struct nfs_writeverf *verf = data->res.verf;
 	struct nfs_page	*req;
 	int status = data->task.tk_status;
 	struct nfs_commit_info cinfo;
@@ -1864,7 +1865,8 @@ static void nfs_commit_release_pages(struct nfs_commit_data *data)
 
 		/* Okay, COMMIT succeeded, apparently. Check the verifier
 		 * returned by the server against all stored verfs. */
-		if (!nfs_write_verifier_cmp(&req->wb_verf, &data->verf.verifier)) {
+		if (verf->committed > NFS_UNSTABLE &&
+		    !nfs_write_verifier_cmp(&req->wb_verf, &verf->verifier)) {
 			/* We have a match */
 			if (req->wb_page)
 				nfs_inode_remove_request(req);
-- 
2.20.1

[PATCH AUTOSEL 5.5 368/542] NFS: Fix fix of show_nfs_errors

[Sasha Levin]

From: Trond Myklebust <trondmy@gmail.com>

[ Upstream commit 118b6292195cfb86a9f43cb65610fc6d980c65f4 ]

Casting a negative value to an unsigned long is not the same as
converting it to its absolute value.

Fixes: 96650e2effa2 ("NFS: Fix show_nfs_errors macros again")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/nfs/nfs4trace.h | 33 +++++++++++++++++----------------
 1 file changed, 17 insertions(+), 16 deletions(-)

diff --git a/fs/nfs/nfs4trace.h b/fs/nfs/nfs4trace.h
index e60b6fbd5ada1..d405557cb43f1 100644
--- a/fs/nfs/nfs4trace.h
+++ b/fs/nfs/nfs4trace.h
@@ -352,7 +352,7 @@ DECLARE_EVENT_CLASS(nfs4_clientid_event,
 		),
 
 		TP_fast_assign(
-			__entry->error = error;
+			__entry->error = error < 0 ? -error : 0;
 			__assign_str(dstaddr, clp->cl_hostname);
 		),
 
@@ -432,7 +432,8 @@ TRACE_EVENT(nfs4_sequence_done,
 			__entry->target_highest_slotid =
 					res->sr_target_highest_slotid;
 			__entry->status_flags = res->sr_status_flags;
-			__entry->error = res->sr_status;
+			__entry->error = res->sr_status < 0 ?
+					-res->sr_status : 0;
 		),
 		TP_printk(
 			"error=%ld (%s) session=0x%08x slot_nr=%u seq_nr=%u "
@@ -640,7 +641,7 @@ TRACE_EVENT(nfs4_state_mgr_failed,
 		),
 
 		TP_fast_assign(
-			__entry->error = status;
+			__entry->error = status < 0 ? -status : 0;
 			__entry->state = clp->cl_state;
 			__assign_str(hostname, clp->cl_hostname);
 			__assign_str(section, section);
@@ -659,7 +660,7 @@ TRACE_EVENT(nfs4_xdr_status,
 		TP_PROTO(
 			const struct xdr_stream *xdr,
 			u32 op,
-			int error
+			u32 error
 		),
 
 		TP_ARGS(xdr, op, error),
@@ -849,7 +850,7 @@ TRACE_EVENT(nfs4_close,
 			__entry->fileid = NFS_FILEID(inode);
 			__entry->fhandle = nfs_fhandle_hash(NFS_FH(inode));
 			__entry->fmode = (__force unsigned int)state->state;
-			__entry->error = error;
+			__entry->error = error < 0 ? -error : 0;
 			__entry->stateid_seq =
 				be32_to_cpu(args->stateid.seqid);
 			__entry->stateid_hash =
@@ -914,7 +915,7 @@ DECLARE_EVENT_CLASS(nfs4_lock_event,
 		TP_fast_assign(
 			const struct inode *inode = state->inode;
 
-			__entry->error = error;
+			__entry->error = error < 0 ? -error : 0;
 			__entry->cmd = cmd;
 			__entry->type = request->fl_type;
 			__entry->start = request->fl_start;
@@ -986,7 +987,7 @@ TRACE_EVENT(nfs4_set_lock,
 		TP_fast_assign(
 			const struct inode *inode = state->inode;
 
-			__entry->error = error;
+			__entry->error = error < 0 ? -error : 0;
 			__entry->cmd = cmd;
 			__entry->type = request->fl_type;
 			__entry->start = request->fl_start;
@@ -1164,7 +1165,7 @@ TRACE_EVENT(nfs4_delegreturn_exit,
 		TP_fast_assign(
 			__entry->dev = res->server->s_dev;
 			__entry->fhandle = nfs_fhandle_hash(args->fhandle);
-			__entry->error = error;
+			__entry->error = error < 0 ? -error : 0;
 			__entry->stateid_seq =
 				be32_to_cpu(args->stateid->seqid);
 			__entry->stateid_hash =
@@ -1204,7 +1205,7 @@ DECLARE_EVENT_CLASS(nfs4_test_stateid_event,
 		TP_fast_assign(
 			const struct inode *inode = state->inode;
 
-			__entry->error = error;
+			__entry->error = error < 0 ? -error : 0;
 			__entry->dev = inode->i_sb->s_dev;
 			__entry->fileid = NFS_FILEID(inode);
 			__entry->fhandle = nfs_fhandle_hash(NFS_FH(inode));
@@ -1306,7 +1307,7 @@ TRACE_EVENT(nfs4_lookupp,
 		TP_fast_assign(
 			__entry->dev = inode->i_sb->s_dev;
 			__entry->ino = NFS_FILEID(inode);
-			__entry->error = error;
+			__entry->error = error < 0 ? -error : 0;
 		),
 
 		TP_printk(
@@ -1342,7 +1343,7 @@ TRACE_EVENT(nfs4_rename,
 			__entry->dev = olddir->i_sb->s_dev;
 			__entry->olddir = NFS_FILEID(olddir);
 			__entry->newdir = NFS_FILEID(newdir);
-			__entry->error = error;
+			__entry->error = error < 0 ? -error : 0;
 			__assign_str(oldname, oldname->name);
 			__assign_str(newname, newname->name);
 		),
@@ -1433,7 +1434,7 @@ DECLARE_EVENT_CLASS(nfs4_inode_stateid_event,
 			__entry->dev = inode->i_sb->s_dev;
 			__entry->fileid = NFS_FILEID(inode);
 			__entry->fhandle = nfs_fhandle_hash(NFS_FH(inode));
-			__entry->error = error;
+			__entry->error = error < 0 ? -error : 0;
 			__entry->stateid_seq =
 				be32_to_cpu(stateid->seqid);
 			__entry->stateid_hash =
@@ -1489,7 +1490,7 @@ DECLARE_EVENT_CLASS(nfs4_getattr_event,
 			__entry->valid = fattr->valid;
 			__entry->fhandle = nfs_fhandle_hash(fhandle);
 			__entry->fileid = (fattr->valid & NFS_ATTR_FATTR_FILEID) ? fattr->fileid : 0;
-			__entry->error = error;
+			__entry->error = error < 0 ? -error : 0;
 		),
 
 		TP_printk(
@@ -1536,7 +1537,7 @@ DECLARE_EVENT_CLASS(nfs4_inode_callback_event,
 		),
 
 		TP_fast_assign(
-			__entry->error = error;
+			__entry->error = error < 0 ? -error : 0;
 			__entry->fhandle = nfs_fhandle_hash(fhandle);
 			if (!IS_ERR_OR_NULL(inode)) {
 				__entry->fileid = NFS_FILEID(inode);
@@ -1593,7 +1594,7 @@ DECLARE_EVENT_CLASS(nfs4_inode_stateid_callback_event,
 		),
 
 		TP_fast_assign(
-			__entry->error = error;
+			__entry->error = error < 0 ? -error : 0;
 			__entry->fhandle = nfs_fhandle_hash(fhandle);
 			if (!IS_ERR_OR_NULL(inode)) {
 				__entry->fileid = NFS_FILEID(inode);
@@ -1896,7 +1897,7 @@ TRACE_EVENT(nfs4_layoutget,
 			__entry->iomode = args->iomode;
 			__entry->offset = args->offset;
 			__entry->count = args->length;
-			__entry->error = error;
+			__entry->error = error < 0 ? -error : 0;
 			__entry->stateid_seq =
 				be32_to_cpu(state->stateid.seqid);
 			__entry->stateid_hash =
-- 
2.20.1

[PATCH AUTOSEL 5.5 369/542] NFSv4.x recover from pre-mature loss of openstateid

[Sasha Levin]

From: Olga Kornievskaia <kolga@netapp.com>

[ Upstream commit d826e5b827641ae1bebb33d23a774f4e9bb8e94f ]

Ever since the commit 0e0cb35b417f, it's possible to lose an open stateid
while retrying a CLOSE due to ERR_OLD_STATEID. Once that happens,
operations that require openstateid fail with EAGAIN which is propagated
to the application then tests like generic/446 and generic/168 fail with
"Resource temporarily unavailable".

Instead of returning this error, initiate state recovery when possible to
recover the open stateid and then try calling nfs4_select_rw_stateid()
again.

Fixes: 0e0cb35b417f ("NFSv4: Handle NFS4ERR_OLD_STATEID in CLOSE/OPEN_DOWNGRADE")
Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/nfs/nfs42proc.c | 36 ++++++++++++++++++++++++++++--------
 fs/nfs/nfs4proc.c  |  2 ++
 fs/nfs/pnfs.c      |  2 --
 3 files changed, 30 insertions(+), 10 deletions(-)

diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
index 1fe83e0f663e2..9637aad36bdca 100644
--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -61,8 +61,11 @@ static int _nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
 
 	status = nfs4_set_rw_stateid(&args.falloc_stateid, lock->open_context,
 			lock, FMODE_WRITE);
-	if (status)
+	if (status) {
+		if (status == -EAGAIN)
+			status = -NFS4ERR_BAD_STATEID;
 		return status;
+	}
 
 	res.falloc_fattr = nfs_alloc_fattr();
 	if (!res.falloc_fattr)
@@ -287,8 +290,11 @@ static ssize_t _nfs42_proc_copy(struct file *src,
 	} else {
 		status = nfs4_set_rw_stateid(&args->src_stateid,
 				src_lock->open_context, src_lock, FMODE_READ);
-		if (status)
+		if (status) {
+			if (status == -EAGAIN)
+				status = -NFS4ERR_BAD_STATEID;
 			return status;
+		}
 	}
 	status = nfs_filemap_write_and_wait_range(file_inode(src)->i_mapping,
 			pos_src, pos_src + (loff_t)count - 1);
@@ -297,8 +303,11 @@ static ssize_t _nfs42_proc_copy(struct file *src,
 
 	status = nfs4_set_rw_stateid(&args->dst_stateid, dst_lock->open_context,
 				     dst_lock, FMODE_WRITE);
-	if (status)
+	if (status) {
+		if (status == -EAGAIN)
+			status = -NFS4ERR_BAD_STATEID;
 		return status;
+	}
 
 	status = nfs_sync_inode(dst_inode);
 	if (status)
@@ -546,8 +555,11 @@ static int _nfs42_proc_copy_notify(struct file *src, struct file *dst,
 	status = nfs4_set_rw_stateid(&args->cna_src_stateid, ctx, l_ctx,
 				     FMODE_READ);
 	nfs_put_lock_context(l_ctx);
-	if (status)
+	if (status) {
+		if (status == -EAGAIN)
+			status = -NFS4ERR_BAD_STATEID;
 		return status;
+	}
 
 	status = nfs4_call_sync(src_server->client, src_server, &msg,
 				&args->cna_seq_args, &res->cnr_seq_res, 0);
@@ -618,8 +630,11 @@ static loff_t _nfs42_proc_llseek(struct file *filep,
 
 	status = nfs4_set_rw_stateid(&args.sa_stateid, lock->open_context,
 			lock, FMODE_READ);
-	if (status)
+	if (status) {
+		if (status == -EAGAIN)
+			status = -NFS4ERR_BAD_STATEID;
 		return status;
+	}
 
 	status = nfs_filemap_write_and_wait_range(inode->i_mapping,
 			offset, LLONG_MAX);
@@ -994,13 +1009,18 @@ static int _nfs42_proc_clone(struct rpc_message *msg, struct file *src_f,
 
 	status = nfs4_set_rw_stateid(&args.src_stateid, src_lock->open_context,
 			src_lock, FMODE_READ);
-	if (status)
+	if (status) {
+		if (status == -EAGAIN)
+			status = -NFS4ERR_BAD_STATEID;
 		return status;
-
+	}
 	status = nfs4_set_rw_stateid(&args.dst_stateid, dst_lock->open_context,
 			dst_lock, FMODE_WRITE);
-	if (status)
+	if (status) {
+		if (status == -EAGAIN)
+			status = -NFS4ERR_BAD_STATEID;
 		return status;
+	}
 
 	res.dst_fattr = nfs_alloc_fattr();
 	if (!res.dst_fattr)
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 76d37161409a5..f9bb4b43a5192 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -3239,6 +3239,8 @@ static int _nfs4_do_setattr(struct inode *inode,
 		nfs_put_lock_context(l_ctx);
 		if (status == -EIO)
 			return -EBADF;
+		else if (status == -EAGAIN)
+			goto zero_stateid;
 	} else {
 zero_stateid:
 		nfs4_stateid_copy(&arg->stateid, &zero_stateid);
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index cec3070ab577e..3ac6b4dea72d3 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -1998,8 +1998,6 @@ pnfs_update_layout(struct inode *ino,
 			trace_pnfs_update_layout(ino, pos, count,
 					iomode, lo, lseg,
 					PNFS_UPDATE_LAYOUT_INVALID_OPEN);
-			if (status != -EAGAIN)
-				goto out_unlock;
 			spin_unlock(&ino->i_lock);
 			nfs4_schedule_stateid_recovery(server, ctx->state);
 			pnfs_clear_first_layoutget(lo);
-- 
2.20.1

[PATCH AUTOSEL 5.5 440/542] sunrpc: Fix potential leaks in sunrpc_cache_unhash()

[Sasha Levin]

From: Trond Myklebust <trondmy@gmail.com>

[ Upstream commit 1d82163714c16ebe09c7a8c9cd3cef7abcc16208 ]

When we unhash the cache entry, we need to handle any pending upcalls
by calling cache_fresh_unlocked().

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/sunrpc/cache.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index f740cb51802af..7ede1e52fd812 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -1888,7 +1888,9 @@ void sunrpc_cache_unhash(struct cache_detail *cd, struct cache_head *h)
 	if (!hlist_unhashed(&h->cache_list)){
 		hlist_del_init_rcu(&h->cache_list);
 		cd->entries--;
+		set_bit(CACHE_CLEANED, &h->flags);
 		spin_unlock(&cd->hash_lock);
+		cache_fresh_unlocked(h, cd);
 		cache_put(h, cd);
 	} else
 		spin_unlock(&cd->hash_lock);
-- 
2.20.1

[PATCH AUTOSEL 5.5 520/542] NFSv4: pnfs_roc() must use cred_fscmp() to compare creds

[Sasha Levin]

From: Trond Myklebust <trondmy@gmail.com>

[ Upstream commit 387122478775be5d9816c34aa29de53d0b926835 ]

When comparing two 'struct cred' for equality w.r.t. behaviour under
filesystem access, we need to use cred_fscmp().

Fixes: a52458b48af1 ("NFS/NFSD/SUNRPC: replace generic creds with 'struct cred'.")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/nfs/pnfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 3ac6b4dea72d3..542ea8dfd1bc7 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -1425,7 +1425,7 @@ bool pnfs_roc(struct inode *ino,
 	/* lo ref dropped in pnfs_roc_release() */
 	layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
 	/* If the creds don't match, we can't compound the layoutreturn */
-	if (!layoutreturn || cred != lo->plh_lc_cred)
+	if (!layoutreturn || cred_fscmp(cred, lo->plh_lc_cred) != 0)
 		goto out_noroc;
 
 	roc = layoutreturn;
-- 
2.20.1

[PATCH AUTOSEL 5.5 531/542] NFS: Fix memory leaks

[Sasha Levin]

From: Wenwen Wang <wenwen@cs.uga.edu>

[ Upstream commit 123c23c6a7b7ecd2a3d6060bea1d94019f71fd66 ]

In _nfs42_proc_copy(), 'res->commit_res.verf' is allocated through
kzalloc() if 'args->sync' is true. In the following code, if
'res->synchronous' is false, handle_async_copy() will be invoked. If an
error occurs during the invocation, the following code will not be executed
and the error will be returned . However, the allocated
'res->commit_res.verf' is not deallocated, leading to a memory leak. This
is also true if the invocation of process_copy_commit() returns an error.

To fix the above leaks, redirect the execution to the 'out' label if an
error is encountered.

Signed-off-by: Wenwen Wang <wenwen@cs.uga.edu>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/nfs/nfs42proc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
index 9637aad36bdca..e2ae54b35dfe1 100644
--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -343,14 +343,14 @@ static ssize_t _nfs42_proc_copy(struct file *src,
 		status = handle_async_copy(res, dst_server, src_server, src,
 				dst, &args->src_stateid, restart);
 		if (status)
-			return status;
+			goto out;
 	}
 
 	if ((!res->synchronous || !args->sync) &&
 			res->write_res.verifier.committed != NFS_FILE_SYNC) {
 		status = process_copy_commit(dst, pos_dst, res);
 		if (status)
-			return status;
+			goto out;
 	}
 
 	truncate_pagecache_range(dst_inode, pos_dst,
-- 
2.20.1

[PATCH AUTOSEL 5.5 532/542] NFSv4: try lease recovery on NFS4ERR_EXPIRED

[Sasha Levin]

From: Robert Milkowski <rmilkowski@gmail.com>

[ Upstream commit 924491f2e476f7234d722b24171a4daff61bbe13 ]

Currently, if an nfs server returns NFS4ERR_EXPIRED to open(),
we return EIO to applications without even trying to recover.

Fixes: 272289a3df72 ("NFSv4: nfs4_do_handle_exception() handle revoke/expiry of a single stateid")
Signed-off-by: Robert Milkowski <rmilkowski@gmail.com>
Reviewed-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/nfs/nfs4proc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index f9bb4b43a5192..95ca7967f54cb 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -3187,6 +3187,11 @@ static struct nfs4_state *nfs4_do_open(struct inode *dir,
 			exception.retry = 1;
 			continue;
 		}
+		if (status == -NFS4ERR_EXPIRED) {
+			nfs4_schedule_lease_recovery(server->nfs_client);
+			exception.retry = 1;
+			continue;
+		}
 		if (status == -EAGAIN) {
 			/* We must have found a delegation */
 			exception.retry = 1;
-- 
2.20.1

[PATCH AUTOSEL 5.5 533/542] NFSv4.0: nfs4_do_fsinfo() should not do implicit lease renewals

[Sasha Levin]

From: Robert Milkowski <rmilkowski@gmail.com>

[ Upstream commit 7dc2993a9e51dd2eee955944efec65bef90265b7 ]

Currently, each time nfs4_do_fsinfo() is called it will do an implicit
NFS4 lease renewal, which is not compliant with the NFS4 specification.
This can result in a lease being expired by an NFS server.

Commit 83ca7f5ab31f ("NFS: Avoid PUTROOTFH when managing leases")
introduced implicit client lease renewal in nfs4_do_fsinfo(),
which can result in the NFSv4.0 lease to expire on a server side,
and servers returning NFS4ERR_EXPIRED or NFS4ERR_STALE_CLIENTID.

This can easily be reproduced by frequently unmounting a sub-mount,
then stat'ing it to get it mounted again, which will delay or even
completely prevent client from sending RENEW operations if no other
NFS operations are issued. Eventually nfs server will expire client's
lease and return an error on file access or next RENEW.

This can also happen when a sub-mount is automatically unmounted
due to inactivity (after nfs_mountpoint_expiry_timeout), then it is
mounted again via stat(). This can result in a short window during
which client's lease will expire on a server but not on a client.
This specific case was observed on production systems.

This patch removes the implicit lease renewal from nfs4_do_fsinfo().

Fixes: 83ca7f5ab31f ("NFS: Avoid PUTROOTFH when managing leases")
Signed-off-by: Robert Milkowski <rmilkowski@gmail.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/nfs/nfs4_fs.h    |  4 +---
 fs/nfs/nfs4proc.c   | 12 ++++++++----
 fs/nfs/nfs4renewd.c |  5 +----
 fs/nfs/nfs4state.c  |  4 +---
 4 files changed, 11 insertions(+), 14 deletions(-)

diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index a7a73b1d1fec5..a5db055e2a9bd 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -446,9 +446,7 @@ extern void nfs4_schedule_state_renewal(struct nfs_client *);
 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
 extern void nfs4_kill_renewd(struct nfs_client *);
 extern void nfs4_renew_state(struct work_struct *);
-extern void nfs4_set_lease_period(struct nfs_client *clp,
-		unsigned long lease,
-		unsigned long lastrenewed);
+extern void nfs4_set_lease_period(struct nfs_client *clp, unsigned long lease);
 
 
 /* nfs4state.c */
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 95ca7967f54cb..a2759b4062aeb 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -5026,16 +5026,13 @@ static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, str
 	struct nfs4_exception exception = {
 		.interruptible = true,
 	};
-	unsigned long now = jiffies;
 	int err;
 
 	do {
 		err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
 		trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
 		if (err == 0) {
-			nfs4_set_lease_period(server->nfs_client,
-					fsinfo->lease_time * HZ,
-					now);
+			nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ);
 			break;
 		}
 		err = nfs4_handle_exception(server, err, &exception);
@@ -6091,6 +6088,7 @@ int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
 		.callback_data = &setclientid,
 		.flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
 	};
+	unsigned long now = jiffies;
 	int status;
 
 	/* nfs_client_id4 */
@@ -6123,6 +6121,9 @@ int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
 		clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
 		put_rpccred(setclientid.sc_cred);
 	}
+
+	if (status == 0)
+		do_renew_lease(clp, now);
 out:
 	trace_nfs4_setclientid(clp, status);
 	dprintk("NFS reply setclientid: %d\n", status);
@@ -8210,6 +8211,7 @@ static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cre
 	struct rpc_task *task;
 	struct nfs41_exchange_id_args *argp;
 	struct nfs41_exchange_id_res *resp;
+	unsigned long now = jiffies;
 	int status;
 
 	task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
@@ -8230,6 +8232,8 @@ static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cre
 	if (status != 0)
 		goto out;
 
+	do_renew_lease(clp, now);
+
 	clp->cl_clientid = resp->clientid;
 	clp->cl_exchange_flags = resp->flags;
 	clp->cl_seqid = resp->seqid;
diff --git a/fs/nfs/nfs4renewd.c b/fs/nfs/nfs4renewd.c
index 6ea431b067dd6..ff876dda7f063 100644
--- a/fs/nfs/nfs4renewd.c
+++ b/fs/nfs/nfs4renewd.c
@@ -138,15 +138,12 @@ nfs4_kill_renewd(struct nfs_client *clp)
  *
  * @clp: pointer to nfs_client
  * @lease: new value for lease period
- * @lastrenewed: time at which lease was last renewed
  */
 void nfs4_set_lease_period(struct nfs_client *clp,
-		unsigned long lease,
-		unsigned long lastrenewed)
+		unsigned long lease)
 {
 	spin_lock(&clp->cl_lock);
 	clp->cl_lease_time = lease;
-	clp->cl_last_renewal = lastrenewed;
 	spin_unlock(&clp->cl_lock);
 
 	/* Cap maximum reconnect timeout at 1/2 lease period */
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 34552329233db..f0b0027343555 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -92,17 +92,15 @@ static int nfs4_setup_state_renewal(struct nfs_client *clp)
 {
 	int status;
 	struct nfs_fsinfo fsinfo;
-	unsigned long now;
 
 	if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
 		nfs4_schedule_state_renewal(clp);
 		return 0;
 	}
 
-	now = jiffies;
 	status = nfs4_proc_get_lease_time(clp, &fsinfo);
 	if (status == 0) {
-		nfs4_set_lease_period(clp, fsinfo.lease_time * HZ, now);
+		nfs4_set_lease_period(clp, fsinfo.lease_time * HZ);
 		nfs4_schedule_state_renewal(clp);
 	}
 
-- 
2.20.1