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afs: Fix non-setting of mtime when writing into mmap

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[ Upstream commit bb413489288e4e457353bac513fddb6330d245ca ]

The mtime on an inode needs to be updated when a write is made into an
mmap'ed section.  There are three ways in which this could be done: update
it when page_mkwrite is called, update it when a page is changed from dirty
to writeback or leave it to the server and fix the mtime up from the reply
to the StoreData RPC.

Found with the generic/215 xfstest.

Fixes: 1cf7a1518aef ("afs: Implement shared-writeable mmap")
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
David Howells 2020-06-12 00:15:13 +01:00 committed by Greg Kroah-Hartman
parent 2ee8f6e722
commit 08de5907c0
1 changed files with 1 additions and 0 deletions
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fs/afs/write.c
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@ -792,6 +792,7 @@ vm_fault_t afs_page_mkwrite(struct vm_fault *vmf)
vmf->page->index, priv);
SetPagePrivate(vmf->page);
set_page_private(vmf->page, priv);
file_update_time(file);
sb_end_pagefault(inode->i_sb);
return VM_FAULT_LOCKED;