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nfs: nfs_file_write() should check for writeback errors 

[ Upstream commit ce368536dd ]

The NFS_CONTEXT_ERROR_WRITE flag (as well as the check of said flag) was
removed by commit 6fbda89b25.  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: 6fbda89b25 ("NFS: Replace custom error reporting mechanism with generic one")
Signed-off-by: Scott Mayhew <smayhew@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Scott Mayhew 2020-08-01 07:10:39 -04:00 committed by Greg Kroah-Hartman
parent da14c05ad8
commit 9340d8bfec
1 changed files with 9 additions and 3 deletions
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12
fs/nfs/file.c
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@ -583,12 +583,14 @@ 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;
}
@ -599,6 +601,8 @@ 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)
@ -623,6 +627,7 @@ 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) {
@ -641,7 +646,8 @@ 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;