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NFS: Don't use page_file_mapping after removing the page

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[ Upstream commit d2ceb7e570 ]

If nfs_page_async_flush() removes the page from the mapping, then we can't
use page_file_mapping() on it as nfs_updatepate() is wont to do when
receiving an error.  Instead, push the mapping to the stack before the page
is possibly truncated.

Fixes: 8fc75bed96 ("NFS: Fix up return value on fatal errors in nfs_page_async_flush()")
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Benjamin Coddington 2019-02-06 06:09:43 -05:00 committed by Greg Kroah-Hartman
parent 86e74ca9fd
commit fc4b12f3ca
1 changed files with 6 additions and 5 deletions
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11
fs/nfs/write.c
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@ -236,9 +236,9 @@ 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 page *page)
static void nfs_set_pageerror(struct address_space *mapping)
{
nfs_zap_mapping(page_file_mapping(page)->host, page_file_mapping(page));
nfs_zap_mapping(mapping->host, mapping);
}
/*
@ -994,7 +994,7 @@ static void nfs_write_completion(struct nfs_pgio_header *hdr)
nfs_list_remove_request(req);
if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) &&
(hdr->good_bytes < bytes)) {
nfs_set_pageerror(req->wb_page);
nfs_set_pageerror(page_file_mapping(req->wb_page));
nfs_context_set_write_error(req->wb_context, hdr->error);
goto remove_req;
}
@ -1330,7 +1330,8 @@ int nfs_updatepage(struct file *file, struct page *page,
unsigned int offset, unsigned int count)
{
struct nfs_open_context *ctx = nfs_file_open_context(file);
struct inode *inode = page_file_mapping(page)->host;
struct address_space *mapping = page_file_mapping(page);
struct inode *inode = mapping->host;
int status = 0;
nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE);
@ -1348,7 +1349,7 @@ int nfs_updatepage(struct file *file, struct page *page,
status = nfs_writepage_setup(ctx, page, offset, count);
if (status < 0)
nfs_set_pageerror(page);
nfs_set_pageerror(mapping);
else
__set_page_dirty_nobuffers(page);
out: