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pnfs: Add LAYOUTGET to OPEN of an existing file

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Signed-off-by: Fred Isaman <fred.isaman@gmail.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Fred Isaman 2016-09-22 12:30:20 -04:00 committed by Trond Myklebust
parent 29a8bfe52d
commit 78746a384c
1 changed files with 73 additions and 17 deletions
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90
fs/nfs/pnfs.c
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@ -921,9 +921,9 @@ pnfs_find_server(struct inode *inode, struct nfs_open_context *ctx)
{
struct nfs_server *server;
if (inode)
if (inode) {
server = NFS_SERVER(inode);
else {
} else {
struct dentry *parent_dir = dget_parent(ctx->dentry);
server = NFS_SERVER(parent_dir->d_inode);
dput(parent_dir);
@ -1736,6 +1736,22 @@ static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET);
}
static void _add_to_server_list(struct pnfs_layout_hdr *lo,
struct nfs_server *server)
{
if (list_empty(&lo->plh_layouts)) {
struct nfs_client *clp = server->nfs_client;
/* The lo must be on the clp list if there is any
* chance of a CB_LAYOUTRECALL(FILE) coming in.
*/
spin_lock(&clp->cl_lock);
if (list_empty(&lo->plh_layouts))
list_add_tail(&lo->plh_layouts, &server->layouts);
spin_unlock(&clp->cl_lock);
}
}
/*
* Layout segment is retreived from the server if not cached.
* The appropriate layout segment is referenced and returned to the caller.
@ -1886,15 +1902,7 @@ lookup_again:
atomic_inc(&lo->plh_outstanding);
spin_unlock(&ino->i_lock);
if (list_empty(&lo->plh_layouts)) {
/* The lo must be on the clp list if there is any
* chance of a CB_LAYOUTRECALL(FILE) coming in.
*/
spin_lock(&clp->cl_lock);
if (list_empty(&lo->plh_layouts))
list_add_tail(&lo->plh_layouts, &server->layouts);
spin_unlock(&clp->cl_lock);
}
_add_to_server_list(lo, server);
pg_offset = arg.offset & ~PAGE_MASK;
if (pg_offset) {
@ -1993,12 +2001,62 @@ pnfs_sanity_check_layout_range(struct pnfs_layout_range *range)
return true;
}
static struct pnfs_layout_hdr *
_pnfs_grab_empty_layout(struct inode *ino, struct nfs_open_context *ctx)
{
struct pnfs_layout_hdr *lo;
spin_lock(&ino->i_lock);
lo = pnfs_find_alloc_layout(ino, ctx, GFP_KERNEL);
if (!lo)
goto out_unlock;
if (!test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags))
goto out_unlock;
if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
goto out_unlock;
if (pnfs_layoutgets_blocked(lo))
goto out_unlock;
if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags))
goto out_unlock;
atomic_inc(&lo->plh_outstanding);
spin_unlock(&ino->i_lock);
_add_to_server_list(lo, NFS_SERVER(ino));
return lo;
out_unlock:
spin_unlock(&ino->i_lock);
pnfs_put_layout_hdr(lo);
return NULL;
}
extern const nfs4_stateid current_stateid;
static void _lgopen_prepare_attached(struct nfs4_opendata *data,
struct nfs_open_context *ctx)
{
/* STUB */
struct inode *ino = data->dentry->d_inode;
struct pnfs_layout_range rng = {
.iomode = (data->o_arg.fmode & FMODE_WRITE) ?
IOMODE_RW: IOMODE_READ,
.offset = 0,
.length = NFS4_MAX_UINT64,
};
struct nfs4_layoutget *lgp;
struct pnfs_layout_hdr *lo;
lo = _pnfs_grab_empty_layout(ino, ctx);
if (!lo)
return;
lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &current_stateid,
&rng, GFP_KERNEL);
if (!lgp) {
pnfs_clear_first_layoutget(lo);
pnfs_put_layout_hdr(lo);
return;
}
data->lgp = lgp;
data->o_arg.lg_args = &lgp->args;
data->o_res.lg_res = &lgp->res;
}
static void _lgopen_prepare_floating(struct nfs4_opendata *data,
@ -2046,11 +2104,9 @@ void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
if (!lgp || lgp->res.layoutp->len == 0)
return;
if (!lgp->args.inode) {
/* Need to grab lo */
spin_lock(&ino->i_lock);
lo = pnfs_find_alloc_layout(ino, ctx, GFP_KERNEL);
atomic_inc(&lo->plh_outstanding);
spin_unlock(&ino->i_lock);
lo = _pnfs_grab_empty_layout(ino, ctx);
if (!lo)
return;
lgp->args.inode = ino;
} else
lo = NFS_I(lgp->args.inode)->layout;