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NFS: Don't corrupt the value of pg_bytes_written in nfs_do_recoalesce() 

commit 0d0ea309357dea0d85a82815f02157eb7fcda39f upstream.

The value of mirror->pg_bytes_written should only be updated after a
successful attempt to flush out the requests on the list.

Fixes: a7d42ddb30 ("nfs: add mirroring support to pgio layer")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Trond Myklebust 2021-05-25 10:40:12 -04:00 committed by Greg Kroah-Hartman
parent 1fc5f4eb9d
commit 785917316b
1 changed files with 5 additions and 7 deletions
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12
fs/nfs/pagelist.c
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@ -1019,17 +1019,16 @@ static void nfs_pageio_doio(struct nfs_pageio_descriptor *desc)
{
struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
if (!list_empty(&mirror->pg_list)) {
int error = desc->pg_ops->pg_doio(desc);
if (error < 0)
desc->pg_error = error;
else
if (list_empty(&mirror->pg_list)) {
mirror->pg_bytes_written += mirror->pg_count;
}
if (list_empty(&mirror->pg_list)) {
mirror->pg_count = 0;
mirror->pg_base = 0;
mirror->pg_count = 0;
mirror->pg_base = 0;
mirror->pg_recoalesce = 0;
}
}
}
@ -1123,7 +1122,6 @@ static int nfs_do_recoalesce(struct nfs_pageio_descriptor *desc)
do {
list_splice_init(&mirror->pg_list, &head);
mirror->pg_bytes_written -= mirror->pg_count;
mirror->pg_count = 0;
mirror->pg_base = 0;
mirror->pg_recoalesce = 0;