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nfs4: serialize layoutcommit 

Current pnfs_layoutcommit_inode can not handle parallel layoutcommit.
And as Trond suggested , there is no need for client to optimize for
parallel layoutcommit. So add NFS_INO_LAYOUTCOMMITTING flag to
mark inflight layoutcommit and serialize lalyoutcommit with it.
Also mark_inode_dirty_sync if pnfs_layoutcommit_inode fails to issue
layoutcommit.

Reported-by: Vitaliy Gusev <gusev.vitaliy@nexenta.com>
Signed-off-by: Peng Tao <peng_tao@emc.com>
Signed-off-by: Jim Rees <rees@umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Peng Tao 2011-10-23 20:21:17 -07:00 committed by Trond Myklebust
parent e20de37757
commit 92407e75ce
3 changed files with 29 additions and 3 deletions
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6
fs/nfs/nfs4proc.c
View File

@ -5950,6 +5950,7 @@ static void nfs4_layoutcommit_release(void *calldata)
{
struct nfs4_layoutcommit_data *data = calldata;
struct pnfs_layout_segment *lseg, *tmp;
unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
pnfs_cleanup_layoutcommit(data);
/* Matched by references in pnfs_set_layoutcommit */
@ -5959,6 +5960,11 @@ static void nfs4_layoutcommit_release(void *calldata)
&lseg->pls_flags))
put_lseg(lseg);
}
clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
smp_mb__after_clear_bit();
wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
put_rpccred(data->cred);
kfree(data);
}

25
fs/nfs/pnfs.c
View File

@ -1443,17 +1443,31 @@ pnfs_layoutcommit_inode(struct inode *inode, bool sync)
/* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
data = kzalloc(sizeof(*data), GFP_NOFS);
if (!data) {
mark_inode_dirty_sync(inode);
status = -ENOMEM;
goto out;
}
if (!test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
goto out_free;
if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
if (!sync) {
status = -EAGAIN;
goto out_free;
}
status = wait_on_bit_lock(&nfsi->flags, NFS_INO_LAYOUTCOMMITTING,
nfs_wait_bit_killable, TASK_KILLABLE);
if (status)
goto out_free;
}
INIT_LIST_HEAD(&data->lseg_list);
spin_lock(&inode->i_lock);
if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
clear_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags);
spin_unlock(&inode->i_lock);
kfree(data);
goto out;
wake_up_bit(&nfsi->flags, NFS_INO_LAYOUTCOMMITTING);
goto out_free;
}
pnfs_list_write_lseg(inode, &data->lseg_list);
@ -1475,6 +1489,11 @@ pnfs_layoutcommit_inode(struct inode *inode, bool sync)
status = nfs4_proc_layoutcommit(data, sync);
out:
if (status)
mark_inode_dirty_sync(inode);
dprintk("<-- %s status %d\n", __func__, status);
return status;
out_free:
kfree(data);
goto out;
}

1
include/linux/nfs_fs.h
View File

@ -229,6 +229,7 @@ struct nfs_inode {
#define NFS_INO_COMMIT (7) /* inode is committing unstable writes */
#define NFS_INO_PNFS_COMMIT (8) /* use pnfs code for commit */
#define NFS_INO_LAYOUTCOMMIT (9) /* layoutcommit required */
#define NFS_INO_LAYOUTCOMMITTING (10) /* layoutcommit inflight */
static inline struct nfs_inode *NFS_I(const struct inode *inode)
{