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NFS: Fix a commit bug 

The new commit code fails to copy the verifier into the wb_verf field
of _all_ the nfs_page structures; it only copies it into the first entry.
The consequence is that most requests end up failing to match in
nfs_commit_release.

Fix is to copy the verifier into the req->wb_verf field in
nfs_write_completion.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Fred Isaman <iisaman@netapp.com>
hifive-unleashed-5.1
Trond Myklebust 2012-06-05 18:32:03 -04:00
parent cdf66442fa
commit 9bce008bae
3 changed files with 8 additions and 5 deletions
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4
fs/nfs/direct.c
View File

@ -710,12 +710,12 @@ static void nfs_direct_write_completion(struct nfs_pgio_header *hdr)
if (dreq->flags == NFS_ODIRECT_RESCHED_WRITES)
bit = NFS_IOHDR_NEED_RESCHED;
else if (dreq->flags == 0) {
memcpy(&dreq->verf, &req->wb_verf,
memcpy(&dreq->verf, hdr->verf,
sizeof(dreq->verf));
bit = NFS_IOHDR_NEED_COMMIT;
dreq->flags = NFS_ODIRECT_DO_COMMIT;
} else if (dreq->flags == NFS_ODIRECT_DO_COMMIT) {
if (memcmp(&dreq->verf, &req->wb_verf, sizeof(dreq->verf))) {
if (memcmp(&dreq->verf, hdr->verf, sizeof(dreq->verf))) {
dreq->flags = NFS_ODIRECT_RESCHED_WRITES;
bit = NFS_IOHDR_NEED_RESCHED;
} else

7
fs/nfs/write.c
View File

@ -80,6 +80,7 @@ struct nfs_write_header *nfs_writehdr_alloc(void)
INIT_LIST_HEAD(&hdr->rpc_list);
spin_lock_init(&hdr->lock);
atomic_set(&hdr->refcnt, 0);
hdr->verf = &p->verf;
}
return p;
}
@ -619,6 +620,7 @@ static void nfs_write_completion(struct nfs_pgio_header *hdr)
goto next;
}
if (test_bit(NFS_IOHDR_NEED_COMMIT, &hdr->flags)) {
memcpy(&req->wb_verf, hdr->verf, sizeof(req->wb_verf));
nfs_mark_request_commit(req, hdr->lseg, &cinfo);
goto next;
}
@ -1255,15 +1257,14 @@ static void nfs_writeback_release_common(void *calldata)
struct nfs_write_data *data = calldata;
struct nfs_pgio_header *hdr = data->header;
int status = data->task.tk_status;
struct nfs_page *req = hdr->req;
if ((status >= 0) && nfs_write_need_commit(data)) {
spin_lock(&hdr->lock);
if (test_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags))
; /* Do nothing */
else if (!test_and_set_bit(NFS_IOHDR_NEED_COMMIT, &hdr->flags))
memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf));
else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf)))
memcpy(hdr->verf, &data->verf, sizeof(*hdr->verf));
else if (memcmp(hdr->verf, &data->verf, sizeof(*hdr->verf)))
set_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags);
spin_unlock(&hdr->lock);
}

2
include/linux/nfs_xdr.h
View File

@ -1237,6 +1237,7 @@ struct nfs_pgio_header {
struct list_head rpc_list;
atomic_t refcnt;
struct nfs_page *req;
struct nfs_writeverf *verf;
struct pnfs_layout_segment *lseg;
loff_t io_start;
const struct rpc_call_ops *mds_ops;
@ -1274,6 +1275,7 @@ struct nfs_write_data {
struct nfs_write_header {
struct nfs_pgio_header header;
struct nfs_write_data rpc_data;
struct nfs_writeverf verf;
};
struct nfs_mds_commit_info {