If we get back something like NFS4ERR_OLD_STATEID, that will be
translated into -EAGAIN, and the do/while loop in send_layoutget
will drive the call again.
This is not quite what we want, I think. An error like that is a
sign that something has changed. That something could have been a
concurrent LAYOUTGET that would give us a usable lseg.
Lift the retry logic into pnfs_update_layout instead. That allows
us to redo the layout search, and may spare us from having to issue
an RPC.
Signed-off-by: Jeff Layton <jeff.layton@xxxxxxxxxxxxxxx>
---
fs/nfs/pnfs.c | 67 ++++++++++++++++++++++++++++++-----------------------------
1 file changed, 34 insertions(+), 33 deletions(-)
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 5f6ed295acb5..5a8c19c57f16 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -839,7 +839,6 @@ send_layoutget(struct pnfs_layout_hdr *lo,
struct inode *ino = lo->plh_inode;
struct nfs_server *server = NFS_SERVER(ino);
struct nfs4_layoutget *lgp;
- struct pnfs_layout_segment *lseg;
loff_t i_size;
dprintk("--> %s\n", __func__);
@@ -849,42 +848,30 @@ send_layoutget(struct pnfs_layout_hdr *lo,
* store in lseg. If we race with a concurrent seqid morphing
* op, then re-send the LAYOUTGET.
*/
- do {
- lgp = kzalloc(sizeof(*lgp), gfp_flags);
- if (lgp == NULL)
- return NULL;
-
- i_size = i_size_read(ino);
-
- lgp->args.minlength = PAGE_SIZE;
- if (lgp->args.minlength > range->length)
- lgp->args.minlength = range->length;
- if (range->iomode == IOMODE_READ) {
- if (range->offset >= i_size)
- lgp->args.minlength = 0;
- else if (i_size - range->offset < lgp->args.minlength)
- lgp->args.minlength = i_size - range->offset;
- }
- lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
- pnfs_copy_range(&lgp->args.range, range);
- lgp->args.type = server->pnfs_curr_ld->id;
- lgp->args.inode = ino;
- lgp->args.ctx = get_nfs_open_context(ctx);
- lgp->gfp_flags = gfp_flags;
- lgp->cred = lo->plh_lc_cred;
+ lgp = kzalloc(sizeof(*lgp), gfp_flags);
+ if (lgp == NULL)
+ return ERR_PTR(-ENOMEM);
- lseg = nfs4_proc_layoutget(lgp, gfp_flags);
- } while (lseg == ERR_PTR(-EAGAIN));
+ i_size = i_size_read(ino);
- if (IS_ERR(lseg)) {
- if (!nfs_error_is_fatal(PTR_ERR(lseg)))
- lseg = NULL;
- } else {
- pnfs_layout_clear_fail_bit(lo,
- pnfs_iomode_to_fail_bit(range->iomode));
+ lgp->args.minlength = PAGE_SIZE;
+ if (lgp->args.minlength > range->length)
+ lgp->args.minlength = range->length;
+ if (range->iomode == IOMODE_READ) {
+ if (range->offset >= i_size)
+ lgp->args.minlength = 0;
+ else if (i_size - range->offset < lgp->args.minlength)
+ lgp->args.minlength = i_size - range->offset;
}
+ lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
+ pnfs_copy_range(&lgp->args.range, range);
+ lgp->args.type = server->pnfs_curr_ld->id;
+ lgp->args.inode = ino;
+ lgp->args.ctx = get_nfs_open_context(ctx);
+ lgp->gfp_flags = gfp_flags;
+ lgp->cred = lo->plh_lc_cred;
- return lseg;
+ return nfs4_proc_layoutget(lgp, gfp_flags);
}
static void pnfs_clear_layoutcommit(struct inode *inode,
@@ -1646,6 +1633,20 @@ lookup_again:
arg.length = PAGE_ALIGN(arg.length);
lseg = send_layoutget(lo, ctx, &arg, gfp_flags);
+ if (IS_ERR(lseg)) {
+ if (lseg == ERR_PTR(-EAGAIN)) {
+ if (first)
+ pnfs_clear_first_layoutget(lo);
+ pnfs_put_layout_hdr(lo);
+ goto lookup_again;
+ }
+
+ if (!nfs_error_is_fatal(PTR_ERR(lseg)))
+ lseg = NULL;
+ } else {
+ pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
+ }
+
atomic_dec(&lo->plh_outstanding);
trace_pnfs_update_layout(ino, pos, count, iomode, lo,
PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
--
2.5.5
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