diff options
| author | Fred Isaman <fred.isaman@gmail.com> | 2016-10-05 16:37:12 +0300 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@hammerspace.com> | 2018-05-31 22:03:11 +0300 |
| commit | c49b5209f99abe082d3d4cd94f0ad924baea34ed (patch) | |
| tree | 315980082bc9f161fd2363668f9f42c067aebee8 /fs/nfs | |
| parent | 6e01260ceeca299b82d466660935534c5c909d54 (diff) | |
| download | linux-c49b5209f99abe082d3d4cd94f0ad924baea34ed.tar.xz | |
pnfs: Add barrier to prevent lgopen using LAYOUTGET during recall
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>
Diffstat (limited to 'fs/nfs')
| -rw-r--r-- | fs/nfs/callback_proc.c | 2 | ||||
| -rw-r--r-- | fs/nfs/pnfs.c | 8 |
2 files changed, 9 insertions, 1 deletions
diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c index a50d7813e3ea..d561161b7c3e 100644 --- a/fs/nfs/callback_proc.c +++ b/fs/nfs/callback_proc.c @@ -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); diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c index 3dfe9fa264a5..a29fdea2db91 100644 --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -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); } |