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cifs: writeback fix

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Wait for the page to be written to the cache before we allow it
to be modified

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
David Howells 2022-01-24 23:15:18 +00:00 committed by Steve French
parent 5d7e282541
commit 70ef38515b
1 changed files with 7 additions and 1 deletions
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8
fs/cifs/file.c
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@ -4210,13 +4210,19 @@ cifs_page_mkwrite(struct vm_fault *vmf)
{
struct page *page = vmf->page;
/* Wait for the page to be written to the cache before we allow it to
* be modified. We then assume the entire page will need writing back.
*/
#ifdef CONFIG_CIFS_FSCACHE
if (PageFsCache(page) &&
wait_on_page_fscache_killable(page) < 0)
return VM_FAULT_RETRY;
#endif
lock_page(page);
wait_on_page_writeback(page);
if (lock_page_killable(page) < 0)
return VM_FAULT_RETRY;
return VM_FAULT_LOCKED;
}