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e5e940170b
At the start of the io paths, try to grab the relevant layout information. This will initiate the inode's layout cache, but stubs ensure the cache stays empty. Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Dean Hildebrand <dhildebz@umich.edu> Signed-off-by: Marc Eshel <eshel@almaden.ibm.com> Signed-off-by: Tao Guo <guotao@nrchpc.ac.cn> Signed-off-by: Ricardo Labiaga <ricardo.labiaga@netapp.com> Signed-off-by: Boaz Harrosh <bharrosh@panasas.com> Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Fred Isaman <iisaman@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
105 lines
3.1 KiB
C
105 lines
3.1 KiB
C
/*
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* pNFS client data structures.
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*
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* Copyright (c) 2002
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* The Regents of the University of Michigan
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* All Rights Reserved
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*
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* Dean Hildebrand <dhildebz@umich.edu>
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*
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* Permission is granted to use, copy, create derivative works, and
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* redistribute this software and such derivative works for any purpose,
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* so long as the name of the University of Michigan is not used in
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* any advertising or publicity pertaining to the use or distribution
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* of this software without specific, written prior authorization. If
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* the above copyright notice or any other identification of the
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* University of Michigan is included in any copy of any portion of
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* this software, then the disclaimer below must also be included.
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*
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* This software is provided as is, without representation or warranty
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* of any kind either express or implied, including without limitation
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* the implied warranties of merchantability, fitness for a particular
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* purpose, or noninfringement. The Regents of the University of
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* Michigan shall not be liable for any damages, including special,
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* indirect, incidental, or consequential damages, with respect to any
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* claim arising out of or in connection with the use of the software,
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* even if it has been or is hereafter advised of the possibility of
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* such damages.
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*/
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#ifndef FS_NFS_PNFS_H
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#define FS_NFS_PNFS_H
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#ifdef CONFIG_NFS_V4_1
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#define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
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enum {
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NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */
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NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */
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};
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/* Per-layout driver specific registration structure */
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struct pnfs_layoutdriver_type {
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struct list_head pnfs_tblid;
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const u32 id;
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const char *name;
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struct module *owner;
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int (*initialize_mountpoint) (struct nfs_server *);
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int (*uninitialize_mountpoint) (struct nfs_server *);
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};
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struct pnfs_layout_hdr {
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unsigned long refcount;
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unsigned long state;
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struct inode *inode;
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};
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extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
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extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
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struct pnfs_layout_segment *
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pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
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enum pnfs_iomode access_type);
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void set_pnfs_layoutdriver(struct nfs_server *, u32 id);
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void unset_pnfs_layoutdriver(struct nfs_server *);
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void pnfs_destroy_layout(struct nfs_inode *);
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static inline int lo_fail_bit(u32 iomode)
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{
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return iomode == IOMODE_RW ?
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NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
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}
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/* Return true if a layout driver is being used for this mountpoint */
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static inline int pnfs_enabled_sb(struct nfs_server *nfss)
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{
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return nfss->pnfs_curr_ld != NULL;
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}
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#else /* CONFIG_NFS_V4_1 */
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static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
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{
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}
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static inline struct pnfs_layout_segment *
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pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
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enum pnfs_iomode access_type)
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{
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return NULL;
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}
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static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id)
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{
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}
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static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
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{
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}
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#endif /* CONFIG_NFS_V4_1 */
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#endif /* FS_NFS_PNFS_H */
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