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pNFS: Fix potential corruption of page being written 

nfs_want_read_modify_write() didn't check for !PagePrivate when pNFS
block or SCSI layout was in use, therefore we could lose data forever
if the page being written was filled by a read before completion.

Signed-off-by: Kazuo Ito <ito_kazuo_g3@lab.ntt.co.jp>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Kazuo Ito 2019-02-14 18:36:58 +09:00 committed by Trond Myklebust
parent bf211ca1a8
commit 97ae91bbf3
1 changed files with 1 additions and 1 deletions
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fs/nfs/file.c
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@ -299,7 +299,7 @@ static int nfs_want_read_modify_write(struct file *file, struct page *page,
unsigned int end = offset + len; unsigned int end = offset + len;
if (pnfs_ld_read_whole_page(file->f_mapping->host)) { if (pnfs_ld_read_whole_page(file->f_mapping->host)) {
if (!PageUptodate(page)) if (!PageUptodate(page) && !PagePrivate(page))
return 1; return 1;
return 0; return 0;
} }