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NFSv4.1/flexfiles: Add refcounting to struct nfs4_ff_layout_mirror 

We do want to share mirrors between layout segments, so add a refcount
to enable that.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2015-08-24 18:08:30 -04:00
parent a6970317f2
commit 28a0d72c68
2 changed files with 28 additions and 9 deletions
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36
fs/nfs/flexfilelayout/flexfilelayout.c
View File

@ -135,6 +135,31 @@ decode_name(struct xdr_stream *xdr, u32 *id)
return 0;
}
static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags)
{
struct nfs4_ff_layout_mirror *mirror;
mirror = kzalloc(sizeof(*mirror), gfp_flags);
if (mirror != NULL) {
spin_lock_init(&mirror->lock);
atomic_set(&mirror->ref, 1);
}
return mirror;
}
static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
{
kfree(mirror->fh_versions);
nfs4_ff_layout_put_deviceid(mirror->mirror_ds);
kfree(mirror);
}
static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror)
{
if (mirror != NULL && atomic_dec_and_test(&mirror->ref))
ff_layout_free_mirror(mirror);
}
static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
{
int i;
@ -144,11 +169,7 @@ static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
/* normally mirror_ds is freed in
* .free_deviceid_node but we still do it here
* for .alloc_lseg error path */
if (fls->mirror_array[i]) {
kfree(fls->mirror_array[i]->fh_versions);
nfs4_ff_layout_put_deviceid(fls->mirror_array[i]->mirror_ds);
kfree(fls->mirror_array[i]);
}
ff_layout_put_mirror(fls->mirror_array[i]);
}
kfree(fls->mirror_array);
fls->mirror_array = NULL;
@ -262,15 +283,12 @@ ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
if (ds_count != 1)
goto out_err_free;
fls->mirror_array[i] =
kzalloc(sizeof(struct nfs4_ff_layout_mirror),
gfp_flags);
fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags);
if (fls->mirror_array[i] == NULL) {
rc = -ENOMEM;
goto out_err_free;
}
spin_lock_init(&fls->mirror_array[i]->lock);
fls->mirror_array[i]->ds_count = ds_count;
fls->mirror_array[i]->lseg = &fls->generic_hdr;

1
fs/nfs/flexfilelayout/flexfilelayout.h
View File

@ -77,6 +77,7 @@ struct nfs4_ff_layout_mirror {
u32 uid;
u32 gid;
struct rpc_cred *cred;
atomic_t ref;
spinlock_t lock;
struct nfs4_ff_layoutstat read_stat;
struct nfs4_ff_layoutstat write_stat;