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pnfs: Add barrier to prevent lgopen using LAYOUTGET during recall

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Since the LAYOUTGET on OPEN can be sent without prior inode information,
existing methods to prevent LAYOUTGET from being sent while processing
CB_LAYOUTRECALL don't work.  Track if a recall occurred while LAYOUTGET
was being sent, and if so ignore the results.

Signed-off-by: Fred Isaman <fred.isaman@gmail.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Fred Isaman 2016-10-05 09:37:12 -04:00 committed by Trond Myklebust
parent 6e01260cee
commit c49b5209f9
4 changed files with 11 additions and 1 deletions
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2
fs/nfs/callback_proc.c
View File

@ -322,6 +322,8 @@ static u32 initiate_bulk_draining(struct nfs_client *clp,
static u32 do_callback_layoutrecall(struct nfs_client *clp,
struct cb_layoutrecallargs *args)
{
write_seqcount_begin(&clp->cl_callback_count);
write_seqcount_end(&clp->cl_callback_count);
if (args->cbl_recall_type == RETURN_FILE)
return initiate_file_draining(clp, args);
return initiate_bulk_draining(clp, args);

8
fs/nfs/pnfs.c
View File

@ -1017,6 +1017,7 @@ pnfs_alloc_init_layoutget_args(struct inode *ino,
nfs4_stateid_copy(&lgp->args.stateid, stateid);
lgp->gfp_flags = gfp_flags;
lgp->cred = get_rpccred(ctx->cred);
lgp->callback_count = raw_seqcount_begin(&server->nfs_client->cl_callback_count);
return lgp;
}
@ -2101,6 +2102,7 @@ void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
{
struct pnfs_layout_hdr *lo;
struct pnfs_layout_segment *lseg;
struct nfs_server *srv = NFS_SERVER(ino);
u32 iomode;
if (!lgp)
@ -2116,7 +2118,7 @@ void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
/* FIXME - Any error not listed above permanently
* halts lgopen attempts.
*/
NFS_SERVER(ino)->caps &= ~NFS_CAP_LGOPEN;
srv->caps &= ~NFS_CAP_LGOPEN;
}
return;
}
@ -2129,6 +2131,9 @@ void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
lo = NFS_I(lgp->args.inode)->layout;
pnfs_get_layout_hdr(lo);
if (read_seqcount_retry(&srv->nfs_client->cl_callback_count,
lgp->callback_count))
goto out;
lseg = pnfs_layout_process(lgp);
atomic_dec(&lo->plh_outstanding);
if (IS_ERR(lseg)) {
@ -2139,6 +2144,7 @@ void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
pnfs_put_lseg(lseg);
}
out:
pnfs_clear_first_layoutget(lo);
pnfs_put_layout_hdr(lo);
}

1
include/linux/nfs_fs_sb.h
View File

@ -28,6 +28,7 @@ struct nfs41_impl_id;
struct nfs_client {
refcount_t cl_count;
atomic_t cl_mds_count;
seqcount_t cl_callback_count;
int cl_cons_state; /* current construction state (-ve: init error) */
#define NFS_CS_READY 0 /* ready to be used */
#define NFS_CS_INITING 1 /* busy initialising */

1
include/linux/nfs_xdr.h
View File

@ -271,6 +271,7 @@ struct nfs4_layoutget {
struct nfs4_layoutget_args args;
struct nfs4_layoutget_res res;
struct rpc_cred *cred;
unsigned callback_count;
gfp_t gfp_flags;
};