提交 e0c2b380 编写于 作者: F Fred Isaman 提交者: Trond Myklebust

NFSv4.1: filelayout driver specific code for COMMIT

Implement all the hooks created in the previous patches.
This requires exporting quite a few functions and adding a few
structure fields.
Signed-off-by: NFred Isaman <iisaman@netapp.com>
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>
上级 988b6dce
......@@ -1470,6 +1470,7 @@ static inline void nfs4_init_once(struct nfs_inode *nfsi)
nfsi->delegation_state = 0;
init_rwsem(&nfsi->rwsem);
nfsi->layout = NULL;
atomic_set(&nfsi->commits_outstanding, 0);
#endif
}
......
......@@ -276,11 +276,25 @@ extern int nfs_initiate_read(struct nfs_read_data *data, struct rpc_clnt *clnt,
extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
/* write.c */
extern void nfs_commit_free(struct nfs_write_data *p);
extern int nfs_initiate_write(struct nfs_write_data *data,
struct rpc_clnt *clnt,
const struct rpc_call_ops *call_ops,
int how);
extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
extern int nfs_initiate_commit(struct nfs_write_data *data,
struct rpc_clnt *clnt,
const struct rpc_call_ops *call_ops,
int how);
extern void nfs_init_commit(struct nfs_write_data *data,
struct list_head *head,
struct pnfs_layout_segment *lseg);
void nfs_retry_commit(struct list_head *page_list,
struct pnfs_layout_segment *lseg);
void nfs_commit_clear_lock(struct nfs_inode *nfsi);
void nfs_commitdata_release(void *data);
void nfs_commit_release_pages(struct nfs_write_data *data);
#ifdef CONFIG_MIGRATION
extern int nfs_migrate_page(struct address_space *,
struct page *, struct page *);
......
......@@ -213,6 +213,37 @@ static int filelayout_write_done_cb(struct rpc_task *task,
return 0;
}
/* Fake up some data that will cause nfs_commit_release to retry the writes. */
static void prepare_to_resend_writes(struct nfs_write_data *data)
{
struct nfs_page *first = nfs_list_entry(data->pages.next);
data->task.tk_status = 0;
memcpy(data->verf.verifier, first->wb_verf.verifier,
sizeof(first->wb_verf.verifier));
data->verf.verifier[0]++; /* ensure verifier mismatch */
}
static int filelayout_commit_done_cb(struct rpc_task *task,
struct nfs_write_data *data)
{
int reset = 0;
if (filelayout_async_handle_error(task, data->args.context->state,
data->ds_clp, &reset) == -EAGAIN) {
dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
__func__, data->ds_clp, data->ds_clp->cl_session);
if (reset) {
prepare_to_resend_writes(data);
filelayout_set_lo_fail(data->lseg);
} else
nfs_restart_rpc(task, data->ds_clp);
return -EAGAIN;
}
return 0;
}
static void filelayout_write_prepare(struct rpc_task *task, void *data)
{
struct nfs_write_data *wdata = (struct nfs_write_data *)data;
......@@ -240,6 +271,16 @@ static void filelayout_write_release(void *data)
wdata->mds_ops->rpc_release(data);
}
static void filelayout_commit_release(void *data)
{
struct nfs_write_data *wdata = (struct nfs_write_data *)data;
nfs_commit_release_pages(wdata);
if (atomic_dec_and_test(&NFS_I(wdata->inode)->commits_outstanding))
nfs_commit_clear_lock(NFS_I(wdata->inode));
nfs_commitdata_release(wdata);
}
struct rpc_call_ops filelayout_read_call_ops = {
.rpc_call_prepare = filelayout_read_prepare,
.rpc_call_done = filelayout_read_call_done,
......@@ -252,6 +293,12 @@ struct rpc_call_ops filelayout_write_call_ops = {
.rpc_release = filelayout_write_release,
};
struct rpc_call_ops filelayout_commit_call_ops = {
.rpc_call_prepare = filelayout_write_prepare,
.rpc_call_done = filelayout_write_call_done,
.rpc_release = filelayout_commit_release,
};
static enum pnfs_try_status
filelayout_read_pagelist(struct nfs_read_data *data)
{
......@@ -574,6 +621,191 @@ filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
return (p_stripe == r_stripe);
}
static bool filelayout_mark_pnfs_commit(struct pnfs_layout_segment *lseg)
{
return !FILELAYOUT_LSEG(lseg)->commit_through_mds;
}
static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j)
{
if (fl->stripe_type == STRIPE_SPARSE)
return nfs4_fl_calc_ds_index(&fl->generic_hdr, j);
else
return j;
}
struct list_head *filelayout_choose_commit_list(struct nfs_page *req)
{
struct pnfs_layout_segment *lseg = req->wb_commit_lseg;
struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
u32 i, j;
struct list_head *list;
/* Note that we are calling nfs4_fl_calc_j_index on each page
* that ends up being committed to a data server. An attractive
* alternative is to add a field to nfs_write_data and nfs_page
* to store the value calculated in filelayout_write_pagelist
* and just use that here.
*/
j = nfs4_fl_calc_j_index(lseg,
(loff_t)req->wb_index << PAGE_CACHE_SHIFT);
i = select_bucket_index(fl, j);
list = &fl->commit_buckets[i];
if (list_empty(list)) {
/* Non-empty buckets hold a reference on the lseg */
get_lseg(lseg);
}
return list;
}
static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
{
struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
if (flseg->stripe_type == STRIPE_SPARSE)
return i;
else
return nfs4_fl_calc_ds_index(lseg, i);
}
static struct nfs_fh *
select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
{
struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
if (flseg->stripe_type == STRIPE_SPARSE) {
if (flseg->num_fh == 1)
i = 0;
else if (flseg->num_fh == 0)
/* Use the MDS OPEN fh set in nfs_read_rpcsetup */
return NULL;
}
return flseg->fh_array[i];
}
static int filelayout_initiate_commit(struct nfs_write_data *data, int how)
{
struct pnfs_layout_segment *lseg = data->lseg;
struct nfs4_pnfs_ds *ds;
u32 idx;
struct nfs_fh *fh;
idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
ds = nfs4_fl_prepare_ds(lseg, idx);
if (!ds) {
printk(KERN_ERR "%s: prepare_ds failed, use MDS\n", __func__);
set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
prepare_to_resend_writes(data);
data->mds_ops->rpc_release(data);
return -EAGAIN;
}
dprintk("%s ino %lu, how %d\n", __func__, data->inode->i_ino, how);
data->write_done_cb = filelayout_commit_done_cb;
data->ds_clp = ds->ds_clp;
fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
if (fh)
data->args.fh = fh;
return nfs_initiate_commit(data, ds->ds_clp->cl_rpcclient,
&filelayout_commit_call_ops, how);
}
/*
* This is only useful while we are using whole file layouts.
*/
static struct pnfs_layout_segment *find_only_write_lseg(struct inode *inode)
{
struct pnfs_layout_segment *lseg, *rv = NULL;
spin_lock(&inode->i_lock);
list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list)
if (lseg->pls_range.iomode == IOMODE_RW)
rv = get_lseg(lseg);
spin_unlock(&inode->i_lock);
return rv;
}
static int alloc_ds_commits(struct inode *inode, struct list_head *list)
{
struct pnfs_layout_segment *lseg;
struct nfs4_filelayout_segment *fl;
struct nfs_write_data *data;
int i, j;
/* Won't need this when non-whole file layout segments are supported
* instead we will use a pnfs_layout_hdr structure */
lseg = find_only_write_lseg(inode);
if (!lseg)
return 0;
fl = FILELAYOUT_LSEG(lseg);
for (i = 0; i < fl->number_of_buckets; i++) {
if (list_empty(&fl->commit_buckets[i]))
continue;
data = nfs_commitdata_alloc();
if (!data)
goto out_bad;
data->ds_commit_index = i;
data->lseg = lseg;
list_add(&data->pages, list);
}
put_lseg(lseg);
return 0;
out_bad:
for (j = i; j < fl->number_of_buckets; j++) {
if (list_empty(&fl->commit_buckets[i]))
continue;
nfs_retry_commit(&fl->commit_buckets[i], lseg);
put_lseg(lseg); /* associated with emptying bucket */
}
put_lseg(lseg);
/* Caller will clean up entries put on list */
return -ENOMEM;
}
/* This follows nfs_commit_list pretty closely */
static int
filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
int how)
{
struct nfs_write_data *data, *tmp;
LIST_HEAD(list);
if (!list_empty(mds_pages)) {
data = nfs_commitdata_alloc();
if (!data)
goto out_bad;
data->lseg = NULL;
list_add(&data->pages, &list);
}
if (alloc_ds_commits(inode, &list))
goto out_bad;
list_for_each_entry_safe(data, tmp, &list, pages) {
list_del_init(&data->pages);
atomic_inc(&NFS_I(inode)->commits_outstanding);
if (!data->lseg) {
nfs_init_commit(data, mds_pages, NULL);
nfs_initiate_commit(data, NFS_CLIENT(inode),
data->mds_ops, how);
} else {
nfs_init_commit(data, &FILELAYOUT_LSEG(data->lseg)->commit_buckets[data->ds_commit_index], data->lseg);
filelayout_initiate_commit(data, how);
}
}
return 0;
out_bad:
list_for_each_entry_safe(data, tmp, &list, pages) {
nfs_retry_commit(&data->pages, data->lseg);
list_del_init(&data->pages);
nfs_commit_free(data);
}
nfs_retry_commit(mds_pages, NULL);
nfs_commit_clear_lock(NFS_I(inode));
return -ENOMEM;
}
static struct pnfs_layoutdriver_type filelayout_type = {
.id = LAYOUT_NFSV4_1_FILES,
.name = "LAYOUT_NFSV4_1_FILES",
......@@ -581,6 +813,9 @@ static struct pnfs_layoutdriver_type filelayout_type = {
.alloc_lseg = filelayout_alloc_lseg,
.free_lseg = filelayout_free_lseg,
.pg_test = filelayout_pg_test,
.mark_pnfs_commit = filelayout_mark_pnfs_commit,
.choose_commit_list = filelayout_choose_commit_list,
.commit_pagelist = filelayout_commit_pagelist,
.read_pagelist = filelayout_read_pagelist,
.write_pagelist = filelayout_write_pagelist,
};
......
......@@ -259,6 +259,7 @@ put_lseg(struct pnfs_layout_segment *lseg)
pnfs_free_lseg_list(&free_me);
}
}
EXPORT_SYMBOL_GPL(put_lseg);
static bool
should_free_lseg(u32 lseg_iomode, u32 recall_iomode)
......
......@@ -59,6 +59,7 @@ struct nfs_write_data *nfs_commitdata_alloc(void)
}
return p;
}
EXPORT_SYMBOL_GPL(nfs_commitdata_alloc);
void nfs_commit_free(struct nfs_write_data *p)
{
......@@ -66,6 +67,7 @@ void nfs_commit_free(struct nfs_write_data *p)
kfree(p->pagevec);
mempool_free(p, nfs_commit_mempool);
}
EXPORT_SYMBOL_GPL(nfs_commit_free);
struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount)
{
......@@ -1283,15 +1285,15 @@ static int nfs_commit_set_lock(struct nfs_inode *nfsi, int may_wait)
return (ret < 0) ? ret : 1;
}
static void nfs_commit_clear_lock(struct nfs_inode *nfsi)
void nfs_commit_clear_lock(struct nfs_inode *nfsi)
{
clear_bit(NFS_INO_COMMIT, &nfsi->flags);
smp_mb__after_clear_bit();
wake_up_bit(&nfsi->flags, NFS_INO_COMMIT);
}
EXPORT_SYMBOL_GPL(nfs_commit_clear_lock);
static void nfs_commitdata_release(void *data)
void nfs_commitdata_release(void *data)
{
struct nfs_write_data *wdata = data;
......@@ -1299,8 +1301,9 @@ static void nfs_commitdata_release(void *data)
put_nfs_open_context(wdata->args.context);
nfs_commit_free(wdata);
}
EXPORT_SYMBOL_GPL(nfs_commitdata_release);
static int nfs_initiate_commit(struct nfs_write_data *data, struct rpc_clnt *clnt,
int nfs_initiate_commit(struct nfs_write_data *data, struct rpc_clnt *clnt,
const struct rpc_call_ops *call_ops,
int how)
{
......@@ -1334,11 +1337,12 @@ static int nfs_initiate_commit(struct nfs_write_data *data, struct rpc_clnt *cln
rpc_put_task(task);
return 0;
}
EXPORT_SYMBOL_GPL(nfs_initiate_commit);
/*
* Set up the argument/result storage required for the RPC call.
*/
static void nfs_init_commit(struct nfs_write_data *data,
void nfs_init_commit(struct nfs_write_data *data,
struct list_head *head,
struct pnfs_layout_segment *lseg)
{
......@@ -1365,8 +1369,9 @@ static void nfs_init_commit(struct nfs_write_data *data,
data->res.verf = &data->verf;
nfs_fattr_init(&data->fattr);
}
EXPORT_SYMBOL_GPL(nfs_init_commit);
static void nfs_retry_commit(struct list_head *page_list,
void nfs_retry_commit(struct list_head *page_list,
struct pnfs_layout_segment *lseg)
{
struct nfs_page *req;
......@@ -1381,6 +1386,7 @@ static void nfs_retry_commit(struct list_head *page_list,
nfs_clear_page_tag_locked(req);
}
}
EXPORT_SYMBOL_GPL(nfs_retry_commit);
/*
* Commit dirty pages
......@@ -1419,7 +1425,7 @@ static void nfs_commit_done(struct rpc_task *task, void *calldata)
return;
}
static void nfs_commit_release_pages(struct nfs_write_data *data)
void nfs_commit_release_pages(struct nfs_write_data *data)
{
struct nfs_page *req;
int status = data->task.tk_status;
......@@ -1456,6 +1462,7 @@ static void nfs_commit_release_pages(struct nfs_write_data *data)
nfs_clear_page_tag_locked(req);
}
}
EXPORT_SYMBOL_GPL(nfs_commit_release_pages);
static void nfs_commit_release(void *calldata)
{
......
......@@ -198,6 +198,7 @@ struct nfs_inode {
/* pNFS layout information */
struct pnfs_layout_hdr *layout;
atomic_t commits_outstanding;
#endif /* CONFIG_NFS_V4*/
#ifdef CONFIG_NFS_FSCACHE
struct fscache_cookie *fscache;
......
......@@ -1040,6 +1040,7 @@ struct nfs_write_data {
struct nfs_writeres res; /* result struct */
struct pnfs_layout_segment *lseg;
struct nfs_client *ds_clp; /* pNFS data server */
int ds_commit_index;
const struct rpc_call_ops *mds_ops;
int (*write_done_cb) (struct rpc_task *task, struct nfs_write_data *data);
#ifdef CONFIG_NFS_V4
......
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