* [PATCH v2 1/2] nfs: ensure correct writeback errors are returned on close()
2020-08-01 11:10 [PATCH v2 0/2] nfs: two writeback error reporting fixes Scott Mayhew
@ 2020-08-01 11:10 ` Scott Mayhew
2020-08-01 11:10 ` [PATCH v2 2/2] nfs: nfs_file_write() should check for writeback errors Scott Mayhew
1 sibling, 0 replies; 3+ messages in thread
From: Scott Mayhew @ 2020-08-01 11:10 UTC (permalink / raw)
To: trond.myklebust, anna.schumaker; +Cc: linux-nfs
nfs_wb_all() calls filemap_write_and_wait(), which uses
filemap_check_errors() to determine the error to return.
filemap_check_errors() only looks at the mapping->flags and will
therefore only return either -ENOSPC or -EIO. To ensure that the
correct error is returned on close(), nfs{,4}_file_flush() should call
filemap_check_wb_err() which looks at the errseq value in
mapping->wb_err without consuming it.
Fixes: 6fbda89b257f ("NFS: Replace custom error reporting mechanism with
generic one")
Signed-off-by: Scott Mayhew <smayhew@redhat.com>
---
fs/nfs/file.c | 5 ++++-
fs/nfs/nfs4file.c | 5 ++++-
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index f96367a2463e..d72496efa17b 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -140,6 +140,7 @@ static int
nfs_file_flush(struct file *file, fl_owner_t id)
{
struct inode *inode = file_inode(file);
+ errseq_t since;
dprintk("NFS: flush(%pD2)\n", file);
@@ -148,7 +149,9 @@ nfs_file_flush(struct file *file, fl_owner_t id)
return 0;
/* Flush writes to the server and return any errors */
- return nfs_wb_all(inode);
+ since = filemap_sample_wb_err(file->f_mapping);
+ nfs_wb_all(inode);
+ return filemap_check_wb_err(file->f_mapping, since);
}
ssize_t
diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index 8e5d6223ddd3..a33970765467 100644
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -110,6 +110,7 @@ static int
nfs4_file_flush(struct file *file, fl_owner_t id)
{
struct inode *inode = file_inode(file);
+ errseq_t since;
dprintk("NFS: flush(%pD2)\n", file);
@@ -125,7 +126,9 @@ nfs4_file_flush(struct file *file, fl_owner_t id)
return filemap_fdatawrite(file->f_mapping);
/* Flush writes to the server and return any errors */
- return nfs_wb_all(inode);
+ since = filemap_sample_wb_err(file->f_mapping);
+ nfs_wb_all(inode);
+ return filemap_check_wb_err(file->f_mapping, since);
}
#ifdef CONFIG_NFS_V4_2
--
2.25.4
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [PATCH v2 2/2] nfs: nfs_file_write() should check for writeback errors
2020-08-01 11:10 [PATCH v2 0/2] nfs: two writeback error reporting fixes Scott Mayhew
2020-08-01 11:10 ` [PATCH v2 1/2] nfs: ensure correct writeback errors are returned on close() Scott Mayhew
@ 2020-08-01 11:10 ` Scott Mayhew
1 sibling, 0 replies; 3+ messages in thread
From: Scott Mayhew @ 2020-08-01 11:10 UTC (permalink / raw)
To: trond.myklebust, anna.schumaker; +Cc: linux-nfs
The NFS_CONTEXT_ERROR_WRITE flag (as well as the check of said flag) was
removed by commit 6fbda89b257f. The absence of an error check allows
writes to be continually queued up for a server that may no longer be
able to handle them. Fix it by adding an error check using the generic
error reporting functions.
Fixes: 6fbda89b257f ("NFS: Replace custom error reporting mechanism with
generic one")
Signed-off-by: Scott Mayhew <smayhew@redhat.com>
---
fs/nfs/file.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index d72496efa17b..63940a7a70be 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -590,12 +590,14 @@ static const struct vm_operations_struct nfs_file_vm_ops = {
.page_mkwrite = nfs_vm_page_mkwrite,
};
-static int nfs_need_check_write(struct file *filp, struct inode *inode)
+static int nfs_need_check_write(struct file *filp, struct inode *inode,
+ int error)
{
struct nfs_open_context *ctx;
ctx = nfs_file_open_context(filp);
- if (nfs_ctx_key_to_expire(ctx, inode))
+ if (nfs_error_is_fatal_on_server(error) ||
+ nfs_ctx_key_to_expire(ctx, inode))
return 1;
return 0;
}
@@ -606,6 +608,8 @@ ssize_t nfs_file_write(struct kiocb *iocb, struct iov_iter *from)
struct inode *inode = file_inode(file);
unsigned long written = 0;
ssize_t result;
+ errseq_t since;
+ int error;
result = nfs_key_timeout_notify(file, inode);
if (result)
@@ -630,6 +634,7 @@ ssize_t nfs_file_write(struct kiocb *iocb, struct iov_iter *from)
if (iocb->ki_pos > i_size_read(inode))
nfs_revalidate_mapping(inode, file->f_mapping);
+ since = filemap_sample_wb_err(file->f_mapping);
nfs_start_io_write(inode);
result = generic_write_checks(iocb, from);
if (result > 0) {
@@ -648,7 +653,8 @@ ssize_t nfs_file_write(struct kiocb *iocb, struct iov_iter *from)
goto out;
/* Return error values */
- if (nfs_need_check_write(file, inode)) {
+ error = filemap_check_wb_err(file->f_mapping, since);
+ if (nfs_need_check_write(file, inode, error)) {
int err = nfs_wb_all(inode);
if (err < 0)
result = err;
--
2.25.4
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