From: Trond Myklebust <trondmy@gmail.com> To: linux-nfs@vger.kernel.org Subject: [PATCH 13/19] pnfs: Add barrier to prevent lgopen using LAYOUTGET during recall Date: Wed, 30 May 2018 14:05:47 -0400 Message-ID: <20180530180553.38769-14-trond.myklebust@hammerspace.com> (raw) In-Reply-To: <20180530180553.38769-13-trond.myklebust@hammerspace.com> From: Fred Isaman <fred.isaman@gmail.com> 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> --- fs/nfs/callback_proc.c | 2 ++ fs/nfs/pnfs.c | 8 +++++++- include/linux/nfs_fs_sb.h | 1 + include/linux/nfs_xdr.h | 1 + 4 files changed, 11 insertions(+), 1 deletion(-) 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 b2158e5bf7f7..5621b85a5c24 100644 --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -979,6 +979,7 @@ 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; } @@ -2051,6 +2052,7 @@ 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) @@ -2066,7 +2068,7 @@ 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; } @@ -2079,6 +2081,9 @@ 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)) { @@ -2089,6 +2094,7 @@ 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); } diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h index 2c18d618604e..74ae3e1d19a0 100644 --- a/include/linux/nfs_fs_sb.h +++ b/include/linux/nfs_fs_sb.h @@ -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 */ diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h index b36be7a703ea..b777eb7da15e 100644 --- a/include/linux/nfs_xdr.h +++ b/include/linux/nfs_xdr.h @@ -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; }; -- 2.17.0
next prev parent reply index Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-05-30 18:05 [PATCH 00/19] Layoutget on OPEN Trond Myklebust 2018-05-30 18:05 ` [PATCH 01/19] pnfs: Remove redundant assignment from nfs4_proc_layoutget() Trond Myklebust 2018-05-30 18:05 ` [PATCH 02/19] pnfs: Store return value of decode_layoutget for later processing Trond Myklebust 2018-05-30 18:05 ` [PATCH 03/19] NFS4: move ctx into nfs4_run_open_task Trond Myklebust 2018-05-30 18:05 ` [PATCH 04/19] pnfs: Add layout driver flag PNFS_LAYOUTGET_ON_OPEN Trond Myklebust 2018-05-30 18:05 ` [PATCH 05/19] pnfs: refactor send_layoutget Trond Myklebust 2018-05-30 18:05 ` [PATCH 06/19] pnfs: move allocations out of nfs4_proc_layoutget Trond Myklebust 2018-05-30 18:05 ` [PATCH 07/19] pnfs: Add conditional encode/decode of LAYOUTGET within OPEN compound Trond Myklebust 2018-05-30 18:05 ` [PATCH 08/19] pnfs: Move nfs4_opendata into nfs4_fs.h Trond Myklebust 2018-05-30 18:05 ` [PATCH 09/19] pnfs: Change pnfs_alloc_init_layoutget_args call signature Trond Myklebust 2018-05-30 18:05 ` [PATCH 10/19] pnfs: Add LAYOUTGET to OPEN of a new file Trond Myklebust 2018-05-30 18:05 ` [PATCH 11/19] pnfs: Add LAYOUTGET to OPEN of an existing file Trond Myklebust 2018-05-30 18:05 ` [PATCH 12/19] pnfs: Stop attempting LAYOUTGET on OPEN on failure Trond Myklebust 2018-05-30 18:05 ` Trond Myklebust [this message] 2018-05-30 18:05 ` [PATCH 14/19] pnfs: Fix manipulation of NFS_LAYOUT_FIRST_LAYOUTGET Trond Myklebust 2018-05-30 18:05 ` [PATCH 15/19] NFSv4/pnfs: Ensure pnfs_parse_lgopen() won't try to parse uninitialised data Trond Myklebust 2018-05-30 18:05 ` [PATCH 16/19] NFSv4/pnfs: Don't switch off layoutget-on-open for transient errors Trond Myklebust 2018-05-30 18:05 ` [PATCH 17/19] pNFS: Don't send LAYOUTGET on OPEN for read, if we already have cached data Trond Myklebust 2018-05-30 18:05 ` [PATCH 18/19] pnfs: Don't call commit on failed layoutget-on-open Trond Myklebust 2018-05-30 18:05 ` [PATCH 19/19] pnfs: Don't release the sequence slot until we've processed layoutget on open Trond Myklebust 2018-05-30 20:10 ` [PATCH 04/19] pnfs: Add layout driver flag PNFS_LAYOUTGET_ON_OPEN Olga Kornievskaia 2018-05-31 12:40 ` Trond Myklebust 2019-09-06 20:17 ` Olga Kornievskaia 2018-05-30 18:25 ` [PATCH 00/19] Layoutget on OPEN Olga Kornievskaia 2018-05-30 18:36 ` Trond Myklebust 2018-05-30 18:37 ` Olga Kornievskaia 2018-05-30 19:27 ` Olga Kornievskaia 2018-05-30 19:29 ` Olga Kornievskaia 2018-05-30 19:47 ` Olga Kornievskaia 2018-05-30 22:33 ` Trond Myklebust 2018-05-31 18:59 ` J. Bruce Fields 2018-06-01 0:28 ` Trond Myklebust
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