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NFS: client needs to maintain list of inodes with active layouts

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In particular, server reboot will invalidate all layouts.

Note that in order to have an active layout, we must get a successful response
from the server.  To avoid adding that machinery, this patch just includes a
stub that fakes up a successful return.  Since the layout is never referenced
for io, this is not a problem.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Dean Hildebrand <dhildebz@umich.edu>
Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Andy Adamson
2010-10-20 00:18:02 -04:00
committed by Trond Myklebust
parent e5e940170b
commit 974cec8ca0
5 changed files with 177 additions and 4 deletions
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14
fs/nfs/pnfs.h
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@@ -30,6 +30,13 @@
#ifndef FS_NFS_PNFS_H
#define FS_NFS_PNFS_H
struct pnfs_layout_segment {
struct list_head fi_list;
u32 iomode;
struct kref kref;
struct pnfs_layout_hdr *layout;
};
#ifdef CONFIG_NFS_V4_1
#define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
@@ -51,6 +58,8 @@ struct pnfs_layoutdriver_type {
struct pnfs_layout_hdr {
unsigned long refcount;
struct list_head layouts; /* other client layouts */
struct list_head segs; /* layout segments list */
unsigned long state;
struct inode *inode;
};
@@ -64,6 +73,7 @@ pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
void set_pnfs_layoutdriver(struct nfs_server *, u32 id);
void unset_pnfs_layoutdriver(struct nfs_server *);
void pnfs_destroy_layout(struct nfs_inode *);
void pnfs_destroy_all_layouts(struct nfs_client *);
static inline int lo_fail_bit(u32 iomode)
@@ -80,6 +90,10 @@ static inline int pnfs_enabled_sb(struct nfs_server *nfss)
#else /* CONFIG_NFS_V4_1 */
static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
{
}
static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
{
}