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authorTrond Myklebust <trond.myklebust@hammerspace.com>2020-11-16 01:37:37 +0300
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2020-11-30 18:52:22 +0300
commit63e2fffa59a9dd91e443b08832656399fd80b7f0 (patch)
treec63da5c4966c08dcfa790cd401bcbc83cf1ee143 /fs
parentb65054597872ce3aefbc6a666385eabdf9e288da (diff)
downloadlinux-63e2fffa59a9dd91e443b08832656399fd80b7f0.tar.xz
pNFS/flexfiles: Fix array overflow when flexfiles mirroring is enabled
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfs/flexfilelayout/flexfilelayout.c27
-rw-r--r--fs/nfs/pagelist.c36
2 files changed, 48 insertions, 15 deletions
diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c
index a163533446fa..24bf5797f88a 100644
--- a/fs/nfs/flexfilelayout/flexfilelayout.c
+++ b/fs/nfs/flexfilelayout/flexfilelayout.c
@@ -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 @@ retry:
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 @@ out:
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)
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index 6985cacf4700..78c9c4bdef2b 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -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 @@ out_failed:
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) {