| /* |
| * 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 |
| |
| #include <linux/nfs_page.h> |
| |
| enum { |
| NFS_LSEG_VALID = 0, /* cleared when lseg is recalled/returned */ |
| NFS_LSEG_ROC, /* roc bit received from server */ |
| }; |
| |
| struct pnfs_layout_segment { |
| struct list_head pls_list; |
| struct pnfs_layout_range pls_range; |
| atomic_t pls_refcount; |
| unsigned long pls_flags; |
| 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_BULK_RECALL, /* bulk recall affecting layout */ |
| NFS_LAYOUT_ROC, /* some lseg had roc bit set */ |
| NFS_LAYOUT_DESTROYED, /* no new use of layout allowed */ |
| }; |
| |
| /* 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); |
| |
| /* test for nfs page cache coalescing */ |
| int (*pg_test)(struct nfs_pageio_descriptor *, struct nfs_page *, struct nfs_page *); |
| }; |
| |
| struct pnfs_layout_hdr { |
| atomic_t plh_refcount; |
| struct list_head plh_layouts; /* other client layouts */ |
| struct list_head plh_bulk_recall; /* clnt list of bulk recalls */ |
| struct list_head plh_segs; /* layout segments list */ |
| nfs4_stateid plh_stateid; |
| atomic_t plh_outstanding; /* number of RPCs out */ |
| unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */ |
| u32 plh_barrier; /* ignore lower seqids */ |
| unsigned long plh_flags; |
| struct inode *plh_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 */ |
| void get_layout_hdr(struct pnfs_layout_hdr *lo); |
| 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 *); |
| void pnfs_pageio_init_read(struct nfs_pageio_descriptor *, struct inode *); |
| int pnfs_layout_process(struct nfs4_layoutget *lgp); |
| void pnfs_free_lseg_list(struct list_head *tmp_list); |
| void pnfs_destroy_layout(struct nfs_inode *); |
| void pnfs_destroy_all_layouts(struct nfs_client *); |
| void put_layout_hdr(struct pnfs_layout_hdr *lo); |
| void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, |
| const nfs4_stateid *new, |
| bool update_barrier); |
| int pnfs_choose_layoutget_stateid(nfs4_stateid *dst, |
| struct pnfs_layout_hdr *lo, |
| struct nfs4_state *open_state); |
| int mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, |
| struct list_head *tmp_list, |
| u32 iomode); |
| bool pnfs_roc(struct inode *ino); |
| void pnfs_roc_release(struct inode *ino); |
| void pnfs_roc_set_barrier(struct inode *ino, u32 barrier); |
| bool pnfs_roc_drain(struct inode *ino, u32 *barrier); |
| |
| |
| static inline int lo_fail_bit(u32 iomode) |
| { |
| return iomode == IOMODE_RW ? |
| NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED; |
| } |
| |
| static inline struct pnfs_layout_segment * |
| get_lseg(struct pnfs_layout_segment *lseg) |
| { |
| if (lseg) { |
| atomic_inc(&lseg->pls_refcount); |
| smp_mb__after_atomic_inc(); |
| } |
| return lseg; |
| } |
| |
| /* 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 * |
| get_lseg(struct pnfs_layout_segment *lseg) |
| { |
| return NULL; |
| } |
| |
| static inline void put_lseg(struct pnfs_layout_segment *lseg) |
| { |
| } |
| |
| 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 bool |
| pnfs_roc(struct inode *ino) |
| { |
| return false; |
| } |
| |
| static inline void |
| pnfs_roc_release(struct inode *ino) |
| { |
| } |
| |
| static inline void |
| pnfs_roc_set_barrier(struct inode *ino, u32 barrier) |
| { |
| } |
| |
| static inline bool |
| pnfs_roc_drain(struct inode *ino, u32 *barrier) |
| { |
| return false; |
| } |
| |
| static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id) |
| { |
| } |
| |
| static inline void unset_pnfs_layoutdriver(struct nfs_server *s) |
| { |
| } |
| |
| static inline void |
| pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *ino) |
| { |
| pgio->pg_test = NULL; |
| } |
| |
| #endif /* CONFIG_NFS_V4_1 */ |
| |
| #endif /* FS_NFS_PNFS_H */ |