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| author | Trond Myklebust <trond.myklebust@primarydata.com> | 2016-11-23 12:36:04 -0500 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@primarydata.com> | 2016-12-01 17:21:40 -0500 |
| commit | 9888d837f3cf6b1f38f7717ab58236f94123ca19 (patch) | |
| tree | 9323611f9335a889de3dff0bbf2b132c42300c29 /fs/nfs/pnfs.c | |
| parent | ae5a459d5f65c3e83f3e14068dde5fb9c9d81807 (diff) | |
| download | linux-9888d837f3cf6b1f38f7717ab58236f94123ca19.tar.gz linux-9888d837f3cf6b1f38f7717ab58236f94123ca19.tar.bz2 linux-9888d837f3cf6b1f38f7717ab58236f94123ca19.zip | |
pNFS: Force a retry of LAYOUTGET if the stateid doesn't match our cache
If the server sends us a completely new stateid, and the client thinks
it already holds a layout, then force a retry of the LAYOUTGET after
invalidating the existing layout in order to avoid corruption due to
races.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs/pnfs.c')
| -rw-r--r-- | fs/nfs/pnfs.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c index d4e06b7459f4..9b7e88b7edfc 100644 --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -1844,7 +1844,10 @@ pnfs_layout_process(struct nfs4_layoutget *lgp) goto out_forget; } - if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) { + if (!pnfs_layout_is_valid(lo)) { + /* We have a completely new layout */ + pnfs_set_layout_stateid(lo, &res->stateid, true); + } else if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) { /* existing state ID, make sure the sequence number matches. */ if (pnfs_layout_stateid_blocked(lo, &res->stateid)) { dprintk("%s forget reply due to sequence\n", __func__); @@ -1854,12 +1857,10 @@ pnfs_layout_process(struct nfs4_layoutget *lgp) } else { /* * We got an entirely new state ID. Mark all segments for the - * inode invalid, and don't bother validating the stateid - * sequence number. + * inode invalid, and retry the layoutget */ pnfs_mark_layout_stateid_invalid(lo, &free_me); - - pnfs_set_layout_stateid(lo, &res->stateid, true); + goto out_forget; } pnfs_get_lseg(lseg); |