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pnfs: lift retry logic from send_layoutget to pnfs_update_layout 

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@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
hifive-unleashed-5.1
Jeff Layton 2016-05-17 12:28:46 -04:00 committed by Anna Schumaker
parent d03ab29dbb
commit 83026d80a1
1 changed files with 36 additions and 36 deletions
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72
fs/nfs/pnfs.c
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@ -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__);
@ -849,45 +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;
lgp = kzalloc(sizeof(*lgp), gfp_flags);
if (lgp == NULL)
return ERR_PTR(-ENOMEM);
i_size = i_size_read(ino);
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;
lseg = nfs4_proc_layoutget(lgp, gfp_flags);
} while (lseg == ERR_PTR(-EAGAIN));
if (IS_ERR(lseg)) {
if (!nfs_error_is_fatal(PTR_ERR(lseg))) {
pnfs_layout_clear_fail_bit(lo,
pnfs_iomode_to_fail_bit(range->iomode));
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,
@ -1649,6 +1633,22 @@ 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))) {
pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
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);