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pNFS/flexfiles: Fix array overflow when flexfiles mirroring is enabled

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If the flexfiles mirroring is enabled, then the read code expects to be
able to set pgio->pg_mirror_idx to point to the data server that is
being used for this particular read. However it does not change the
pg_mirror_count because we only need to send a single read.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2020-11-15 17:37:37 -05:00 • committed by Anna Schumaker
parent b650545978
commit 63e2fffa59
3 changed files with 52 additions and 15 deletions
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4
include/linux/nfs_page.h
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@ -55,6 +55,7 @@ struct nfs_page {
unsigned short wb_nio; /* Number of I/O attempts */
};
struct nfs_pgio_mirror;
struct nfs_pageio_descriptor;
struct nfs_pageio_ops {
void (*pg_init)(struct nfs_pageio_descriptor *, struct nfs_page *);
@ -64,6 +65,9 @@ struct nfs_pageio_ops {
unsigned int (*pg_get_mirror_count)(struct nfs_pageio_descriptor *,
struct nfs_page *);
void (*pg_cleanup)(struct nfs_pageio_descriptor *);
struct nfs_pgio_mirror *
(*pg_get_mirror)(struct nfs_pageio_descriptor *, u32);
u32 (*pg_set_mirror)(struct nfs_pageio_descriptor *, u32);
};
struct nfs_rw_ops {