/* * pNFS client data structures. * * Copyright (c) 2002 * The Regents of the University of Michigan * All Rights Reserved * * Dean Hildebrand <dhildebz@umich.edu> * * Permission is granted to use, copy, create derivative works, and * redistribute this software and such derivative works for any purpose, * so long as the name of the University of Michigan is not used in * any advertising or publicity pertaining to the use or distribution * of this software without specific, written prior authorization. If * the above copyright notice or any other identification of the * University of Michigan is included in any copy of any portion of * this software, then the disclaimer below must also be included. * * This software is provided as is, without representation or warranty * of any kind either express or implied, including without limitation * the implied warranties of merchantability, fitness for a particular * purpose, or noninfringement. The Regents of the University of * Michigan shall not be liable for any damages, including special, * indirect, incidental, or consequential damages, with respect to any * claim arising out of or in connection with the use of the software, * even if it has been or is hereafter advised of the possibility of * such damages. */ #ifndef FS_NFS_PNFS_H #define FS_NFS_PNFS_H struct pnfs_layout_segment { struct list_head pls_list; struct pnfs_layout_range pls_range; struct kref pls_refcount; struct pnfs_layout_hdr *pls_layout; }; #ifdef CONFIG_NFS_V4_1 #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4" enum { NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */ NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */ NFS_LAYOUT_STATEID_SET, /* have a valid layout stateid */ }; /* Per-layout driver specific registration structure */ struct pnfs_layoutdriver_type { struct list_head pnfs_tblid; const u32 id; const char *name; struct module *owner; int (*set_layoutdriver) (struct nfs_server *); int (*clear_layoutdriver) (struct nfs_server *); struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr); void (*free_lseg) (struct pnfs_layout_segment *lseg); }; struct pnfs_layout_hdr { unsigned long refcount; struct list_head layouts; /* other client layouts */ struct list_head segs; /* layout segments list */ seqlock_t seqlock; /* Protects the stateid */ nfs4_stateid stateid; unsigned long plh_flags; struct inode *inode; }; struct pnfs_device { struct nfs4_deviceid dev_id; unsigned int layout_type; unsigned int mincount; struct page **pages; void *area; unsigned int pgbase; unsigned int pglen; }; /* * Device ID RCU cache. A device ID is unique per client ID and layout type. */ #define NFS4_DEVICE_ID_HASH_BITS 5 #define NFS4_DEVICE_ID_HASH_SIZE (1 << NFS4_DEVICE_ID_HASH_BITS) #define NFS4_DEVICE_ID_HASH_MASK (NFS4_DEVICE_ID_HASH_SIZE - 1) static inline u32 nfs4_deviceid_hash(struct nfs4_deviceid *id) { unsigned char *cptr = (unsigned char *)id->data; unsigned int nbytes = NFS4_DEVICEID4_SIZE; u32 x = 0; while (nbytes--) { x *= 37; x += *cptr++; } return x & NFS4_DEVICE_ID_HASH_MASK; } struct pnfs_deviceid_node { struct hlist_node de_node; struct nfs4_deviceid de_id; atomic_t de_ref; }; struct pnfs_deviceid_cache { spinlock_t dc_lock; atomic_t dc_ref; void (*dc_free_callback)(struct pnfs_deviceid_node *); struct hlist_head dc_deviceids[NFS4_DEVICE_ID_HASH_SIZE]; }; extern int pnfs_alloc_init_deviceid_cache(struct nfs_client *, void (*free_callback)(struct pnfs_deviceid_node *)); extern void pnfs_put_deviceid_cache(struct nfs_client *); extern struct pnfs_deviceid_node *pnfs_find_get_deviceid( struct pnfs_deviceid_cache *, struct nfs4_deviceid *); extern struct pnfs_deviceid_node *pnfs_add_deviceid( struct pnfs_deviceid_cache *, struct pnfs_deviceid_node *); extern void pnfs_put_deviceid(struct pnfs_deviceid_cache *c, struct pnfs_deviceid_node *devid); extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *); extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *); /* nfs4proc.c */ extern int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *dev); extern int nfs4_proc_layoutget(struct nfs4_layoutget *lgp); /* pnfs.c */ struct pnfs_layout_segment * pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx, enum pnfs_iomode access_type); void set_pnfs_layoutdriver(struct nfs_server *, u32 id); void unset_pnfs_layoutdriver(struct nfs_server *); int pnfs_layout_process(struct nfs4_layoutget *lgp); void pnfs_destroy_layout(struct nfs_inode *); void pnfs_destroy_all_layouts(struct nfs_client *); void put_layout_hdr(struct inode *inode); void pnfs_get_layout_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo, struct nfs4_state *open_state); static inline int lo_fail_bit(u32 iomode) { return iomode == IOMODE_RW ? NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED; } /* Return true if a layout driver is being used for this mountpoint */ static inline int pnfs_enabled_sb(struct nfs_server *nfss) { return nfss->pnfs_curr_ld != NULL; } #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) { } static inline struct pnfs_layout_segment * pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx, enum pnfs_iomode access_type) { return NULL; } static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id) { } static inline void unset_pnfs_layoutdriver(struct nfs_server *s) { } #endif /* CONFIG_NFS_V4_1 */ #endif /* FS_NFS_PNFS_H */