diff options
| author |  Trond Myklebust <trond.myklebust@primarydata.com>
| 2016-11-20 13:13:54 -0500 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@primarydata.com>
| 2016-12-01 17:21:43 -0500 |
| commit | 2a974425e57fb882c93709c6072bf66d04431635 (patch) | |
| tree | e76a058429db171c98f5fb58e927441128b11ff7 | |
| parent | pNFS: Do not free layout segments that are marked for return (diff) | |
| download | linux-2a974425e57fb882c93709c6072bf66d04431635.tar.gz linux-2a974425e57fb882c93709c6072bf66d04431635.tar.bz2 linux-2a974425e57fb882c93709c6072bf66d04431635.zip | |
NFSv4: Ignore LAYOUTRETURN result if the layout doesn't match or is invalid
Fix a potential race with CB_LAYOUTRECALL in which the server recalls the
remaining layout segments while our LAYOUTRETURN is still in transit.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
| -rw-r--r-- | fs/nfs/nfs4proc.c | 3 | ||||
| -rw-r--r-- | fs/nfs/pnfs.c | 8 | ||||
| -rw-r--r-- | fs/nfs/pnfs.h | 2 |
3 files changed, 9 insertions, 4 deletions
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 561b21e4a930..87972cfa62bc 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -8574,8 +8574,7 @@ static void nfs4_layoutreturn_release(void *calldata) struct pnfs_layout_hdr *lo = lrp->args.layout; dprintk("--> %s\n", __func__); - pnfs_layoutreturn_free_lsegs(lo, &lrp->args.range, - be32_to_cpu(lrp->args.stateid.seqid), + pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range, lrp->res.lrs_present ? &lrp->res.stateid : NULL); nfs4_sequence_free_slot(&lrp->res.seq_res); pnfs_put_layout_hdr(lrp->args.layout); diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c index 555151b6d31b..471018f27c8d 100644 --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -961,20 +961,26 @@ static void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo) } void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo, + const nfs4_stateid *arg_stateid, const struct pnfs_layout_range *range, - u32 seq, const nfs4_stateid *stateid) { struct inode *inode = lo->plh_inode; LIST_HEAD(freeme); spin_lock(&inode->i_lock); + if (!pnfs_layout_is_valid(lo) || !arg_stateid || + !nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid)) + goto out_unlock; if (stateid) { + u32 seq = be32_to_cpu(arg_stateid->seqid); + pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq); pnfs_free_returned_lsegs(lo, &freeme, range, seq); pnfs_set_layout_stateid(lo, stateid, true); } else pnfs_mark_layout_stateid_invalid(lo, &freeme); +out_unlock: pnfs_clear_layoutreturn_waitbit(lo); spin_unlock(&inode->i_lock); pnfs_free_lseg_list(&freeme); diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h index a382710edf40..bc9a3aa31d3c 100644 --- a/fs/nfs/pnfs.h +++ b/fs/nfs/pnfs.h @@ -295,8 +295,8 @@ struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino, bool strict_iomode, gfp_t gfp_flags); void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo, + const nfs4_stateid *arg_stateid, const struct pnfs_layout_range *range, - u32 seq, const nfs4_stateid *stateid); void pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo, |