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nfs: ensure correct writeback errors are returned on close()

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[ Upstream commit 67dd23f9e6fbaf163431912ef5599c5e0693476c ]

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: 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>
This commit is contained in:
Scott Mayhew 2020-08-01 07:10:38 -04:00 • committed by Greg Kroah-Hartman
commit 7dccbf1111
2 changed files with 8 additions and 2 deletions
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5
fs/nfs/file.c
View file

@ -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

5
fs/nfs/nfs4file.c
View file

@ -109,6 +109,7 @@ 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);
@ -124,7 +125,9 @@ 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