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| author | Trond Myklebust <trond.myklebust@primarydata.com> | 2016-07-15 01:34:12 +0300 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@primarydata.com> | 2016-07-19 23:22:47 +0300 |
| commit | 56b38a1f7c781519eef09c1668a3c97ea911f86b (patch) | |
| tree | b9f1ebb18cf397a61fb38a6cdd6f43243078bc60 /fs/nfs | |
| parent | 8487c479e2668dd1231e9c3c77a203d744aec081 (diff) | |
| download | linux-56b38a1f7c781519eef09c1668a3c97ea911f86b.tar.xz | |
pNFS: Fix post-layoutget error handling in pnfs_update_layout()
The non-retry error path is currently broken and ends up releasing the
reference to the layout twice. It also can end up clearing the
NFS_LAYOUT_FIRST_LAYOUTGET flag twice, causing a race.
In addition, the retry path will fail to decrement the plh_outstanding
counter.
Fixes: 183d9e7b112aa ("pnfs: rework LAYOUTGET retry handling")
Cc: stable@vger.kernel.org # 4.7
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Diffstat (limited to 'fs/nfs')
| -rw-r--r-- | fs/nfs/pnfs.c | 21 |
1 files changed, 11 insertions, 10 deletions
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c index 0fbe734cc38c..563f131c9abe 100644 --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -1645,6 +1645,7 @@ lookup_again: lseg = send_layoutget(lo, ctx, &stateid, &arg, &timeout, gfp_flags); trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET); + atomic_dec(&lo->plh_outstanding); if (IS_ERR(lseg)) { switch(PTR_ERR(lseg)) { case -ERECALLCONFLICT: @@ -1652,26 +1653,26 @@ lookup_again: lseg = NULL; /* Fallthrough */ case -EAGAIN: - pnfs_put_layout_hdr(lo); - if (first) - pnfs_clear_first_layoutget(lo); - if (lseg) { - trace_pnfs_update_layout(ino, pos, count, - iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY); - goto lookup_again; - } - /* Fallthrough */ + break; default: if (!nfs_error_is_fatal(PTR_ERR(lseg))) { pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); lseg = NULL; } + goto out_put_layout_hdr; + } + if (lseg) { + if (first) + pnfs_clear_first_layoutget(lo); + trace_pnfs_update_layout(ino, pos, count, + iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY); + pnfs_put_layout_hdr(lo); + goto lookup_again; } } else { pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); } - atomic_dec(&lo->plh_outstanding); out_put_layout_hdr: if (first) pnfs_clear_first_layoutget(lo); |