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nfs41: wait for LAYOUTRETURN before retrying LAYOUTGET

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Also take care to stop waiting if someone clears retry bit.

Signed-off-by: Peng Tao <tao.peng@primarydata.com>
This commit is contained in:
Peng Tao 2014-12-01 08:22:23 +08:00 committed by Tom Haynes
parent 012fa16dca
commit aa8a45ee97
3 changed files with 45 additions and 3 deletions
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4
fs/nfs/nfs4proc.c
View file

@ -7796,7 +7796,9 @@ static void nfs4_layoutreturn_release(void *calldata)
spin_lock(&lo->plh_inode->i_lock);
if (lrp->res.lrs_present)
pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
clear_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
smp_mb__after_atomic();
wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE, &lo->plh_flags);
rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
lo->plh_block_lgets--;

39
fs/nfs/pnfs.c
View file

@ -1398,6 +1398,26 @@ static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
return ret;
}
/* stop waiting if someone clears NFS_LAYOUT_RETRY_LAYOUTGET bit. */
static int pnfs_layoutget_retry_bit_wait(struct wait_bit_key *key)
{
if (!test_bit(NFS_LAYOUT_RETRY_LAYOUTGET, key->flags))
return 1;
return nfs_wait_bit_killable(key);
}
static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
{
/*
* send layoutcommit as it can hold up layoutreturn due to lseg
* reference
*/
pnfs_layoutcommit_inode(lo->plh_inode, false);
return !wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,
pnfs_layoutget_retry_bit_wait,
TASK_UNINTERRUPTIBLE);
}
/*
* Layout segment is retreived from the server if not cached.
* The appropriate layout segment is referenced and returned to the caller.
@ -1444,7 +1464,8 @@ lookup_again:
}
/* if LAYOUTGET already failed once we don't try again */
if (pnfs_layout_io_test_failed(lo, iomode))
if (pnfs_layout_io_test_failed(lo, iomode) &&
!pnfs_should_retry_layoutget(lo))
goto out_unlock;
first = list_empty(&lo->plh_segs);
@ -1469,6 +1490,22 @@ lookup_again:
goto out_unlock;
}
/*
* Because we free lsegs before sending LAYOUTRETURN, we need to wait
* for LAYOUTRETURN even if first is true.
*/
if (!lseg && pnfs_should_retry_layoutget(lo) &&
test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
spin_unlock(&ino->i_lock);
dprintk("%s wait for layoutreturn\n", __func__);
if (pnfs_prepare_to_retry_layoutget(lo)) {
pnfs_put_layout_hdr(lo);
dprintk("%s retrying\n", __func__);
goto lookup_again;
}
goto out_put_layout_hdr;
}
if (pnfs_layoutgets_blocked(lo, &arg, 0))
goto out_unlock;
atomic_inc(&lo->plh_outstanding);

5
fs/nfs/pnfs.h
View file

@ -359,8 +359,11 @@ static inline void pnfs_set_retry_layoutget(struct pnfs_layout_hdr *lo)
static inline void pnfs_clear_retry_layoutget(struct pnfs_layout_hdr *lo)
{
if (test_and_clear_bit(NFS_LAYOUT_RETRY_LAYOUTGET, &lo->plh_flags))
if (test_and_clear_bit(NFS_LAYOUT_RETRY_LAYOUTGET, &lo->plh_flags)) {
atomic_dec(&lo->plh_refcount);
/* wake up waiters for LAYOUTRETURN as that is not needed */
wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
}
}
static inline bool pnfs_should_retry_layoutget(struct pnfs_layout_hdr *lo)