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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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27
fs/nfs/flexfilelayout/flexfilelayout.c
View File

@ -838,7 +838,7 @@ ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
struct nfs_pgio_mirror *pgm;
struct nfs4_ff_layout_mirror *mirror;
struct nfs4_pnfs_ds *ds;
u32 ds_idx, i;
u32 ds_idx;
retry:
ff_layout_pg_check_layout(pgio, req);
@ -864,11 +864,9 @@ ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
goto retry;
}
for (i = 0; i < pgio->pg_mirror_count; i++) {
mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
pgm = &pgio->pg_mirrors[i];
pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
}
mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
pgm = &pgio->pg_mirrors[0];
pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
pgio->pg_mirror_idx = ds_idx;
@ -985,6 +983,21 @@ ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
return 1;
}
static u32
ff_layout_pg_set_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx)
{
u32 old = desc->pg_mirror_idx;
desc->pg_mirror_idx = idx;
return old;
}
static struct nfs_pgio_mirror *
ff_layout_pg_get_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx)
{
return &desc->pg_mirrors[idx];
}
static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
.pg_init = ff_layout_pg_init_read,
.pg_test = pnfs_generic_pg_test,
@ -998,6 +1011,8 @@ static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
.pg_doio = pnfs_generic_pg_writepages,
.pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
.pg_cleanup = pnfs_generic_pg_cleanup,
.pg_get_mirror = ff_layout_pg_get_mirror_write,
.pg_set_mirror = ff_layout_pg_set_mirror_write,
};
static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)

36
fs/nfs/pagelist.c
View File

@ -31,13 +31,29 @@
static struct kmem_cache *nfs_page_cachep;
static const struct rpc_call_ops nfs_pgio_common_ops;
static struct nfs_pgio_mirror *
nfs_pgio_get_mirror(struct nfs_pageio_descriptor *desc, u32 idx)
{
if (desc->pg_ops->pg_get_mirror)
return desc->pg_ops->pg_get_mirror(desc, idx);
return &desc->pg_mirrors[0];
}
struct nfs_pgio_mirror *
nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc)
{
return &desc->pg_mirrors[desc->pg_mirror_idx];
return nfs_pgio_get_mirror(desc, desc->pg_mirror_idx);
}
EXPORT_SYMBOL_GPL(nfs_pgio_current_mirror);
static u32
nfs_pgio_set_current_mirror(struct nfs_pageio_descriptor *desc, u32 idx)
{
if (desc->pg_ops->pg_set_mirror)
return desc->pg_ops->pg_set_mirror(desc, idx);
return desc->pg_mirror_idx;
}
void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
struct nfs_pgio_header *hdr,
void (*release)(struct nfs_pgio_header *hdr))
@ -1259,7 +1275,7 @@ static void nfs_pageio_error_cleanup(struct nfs_pageio_descriptor *desc)
return;
for (midx = 0; midx < desc->pg_mirror_count; midx++) {
mirror = &desc->pg_mirrors[midx];
mirror = nfs_pgio_get_mirror(desc, midx);
desc->pg_completion_ops->error_cleanup(&mirror->pg_list,
desc->pg_error);
}
@ -1293,12 +1309,12 @@ int nfs_pageio_add_request(struct nfs_pageio_descriptor *desc,
goto out_failed;
}
desc->pg_mirror_idx = midx;
nfs_pgio_set_current_mirror(desc, midx);
if (!nfs_pageio_add_request_mirror(desc, dupreq))
goto out_cleanup_subreq;
}
desc->pg_mirror_idx = 0;
nfs_pgio_set_current_mirror(desc, 0);
if (!nfs_pageio_add_request_mirror(desc, req))
goto out_failed;
@ -1320,10 +1336,12 @@ int nfs_pageio_add_request(struct nfs_pageio_descriptor *desc,
static void nfs_pageio_complete_mirror(struct nfs_pageio_descriptor *desc,
u32 mirror_idx)
{
struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[mirror_idx];
u32 restore_idx = desc->pg_mirror_idx;
struct nfs_pgio_mirror *mirror;
u32 restore_idx;
restore_idx = nfs_pgio_set_current_mirror(desc, mirror_idx);
mirror = nfs_pgio_current_mirror(desc);
desc->pg_mirror_idx = mirror_idx;
for (;;) {
nfs_pageio_doio(desc);
if (desc->pg_error < 0 || !mirror->pg_recoalesce)
@ -1331,7 +1349,7 @@ static void nfs_pageio_complete_mirror(struct nfs_pageio_descriptor *desc,
if (!nfs_do_recoalesce(desc))
break;
}
desc->pg_mirror_idx = restore_idx;
nfs_pgio_set_current_mirror(desc, restore_idx);
}
/*
@ -1405,7 +1423,7 @@ void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *desc, pgoff_t index)
u32 midx;
for (midx = 0; midx < desc->pg_mirror_count; midx++) {
mirror = &desc->pg_mirrors[midx];
mirror = nfs_pgio_get_mirror(desc, midx);
if (!list_empty(&mirror->pg_list)) {
prev = nfs_list_entry(mirror->pg_list.prev);
if (index != prev->wb_index + 1) {

4
include/linux/nfs_page.h
View File

@ -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 {