Ricardo Labiaga | 85e174b | 2010-10-20 00:17:58 -0400 | [diff] [blame] | 1 | /* |
| 2 | * pNFS client data structures. |
| 3 | * |
| 4 | * Copyright (c) 2002 |
| 5 | * The Regents of the University of Michigan |
| 6 | * All Rights Reserved |
| 7 | * |
| 8 | * Dean Hildebrand <dhildebz@umich.edu> |
| 9 | * |
| 10 | * Permission is granted to use, copy, create derivative works, and |
| 11 | * redistribute this software and such derivative works for any purpose, |
| 12 | * so long as the name of the University of Michigan is not used in |
| 13 | * any advertising or publicity pertaining to the use or distribution |
| 14 | * of this software without specific, written prior authorization. If |
| 15 | * the above copyright notice or any other identification of the |
| 16 | * University of Michigan is included in any copy of any portion of |
| 17 | * this software, then the disclaimer below must also be included. |
| 18 | * |
| 19 | * This software is provided as is, without representation or warranty |
| 20 | * of any kind either express or implied, including without limitation |
| 21 | * the implied warranties of merchantability, fitness for a particular |
| 22 | * purpose, or noninfringement. The Regents of the University of |
| 23 | * Michigan shall not be liable for any damages, including special, |
| 24 | * indirect, incidental, or consequential damages, with respect to any |
| 25 | * claim arising out of or in connection with the use of the software, |
| 26 | * even if it has been or is hereafter advised of the possibility of |
| 27 | * such damages. |
| 28 | */ |
| 29 | |
| 30 | #ifndef FS_NFS_PNFS_H |
| 31 | #define FS_NFS_PNFS_H |
| 32 | |
Fred Isaman | 4541d16 | 2011-01-06 11:36:23 +0000 | [diff] [blame] | 33 | enum { |
| 34 | NFS_LSEG_VALID = 0, /* cleared when lseg is recalled/returned */ |
| 35 | }; |
| 36 | |
Andy Adamson | 974cec8 | 2010-10-20 00:18:02 -0400 | [diff] [blame] | 37 | struct pnfs_layout_segment { |
Fred Isaman | 566052c | 2011-01-06 11:36:20 +0000 | [diff] [blame] | 38 | struct list_head pls_list; |
| 39 | struct pnfs_layout_range pls_range; |
Fred Isaman | 4541d16 | 2011-01-06 11:36:23 +0000 | [diff] [blame] | 40 | atomic_t pls_refcount; |
| 41 | unsigned long pls_flags; |
Fred Isaman | 566052c | 2011-01-06 11:36:20 +0000 | [diff] [blame] | 42 | struct pnfs_layout_hdr *pls_layout; |
Andy Adamson | 974cec8 | 2010-10-20 00:18:02 -0400 | [diff] [blame] | 43 | }; |
| 44 | |
Ricardo Labiaga | 85e174b | 2010-10-20 00:17:58 -0400 | [diff] [blame] | 45 | #ifdef CONFIG_NFS_V4_1 |
| 46 | |
| 47 | #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4" |
| 48 | |
Benny Halevy | e5e9401 | 2010-10-20 00:18:01 -0400 | [diff] [blame] | 49 | enum { |
| 50 | NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */ |
| 51 | NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */ |
Fred Isaman | 43f1b3d | 2011-01-06 11:36:30 +0000 | [diff] [blame^] | 52 | NFS_LAYOUT_BULK_RECALL, /* bulk recall affecting layout */ |
Fred Isaman | 4541d16 | 2011-01-06 11:36:23 +0000 | [diff] [blame] | 53 | NFS_LAYOUT_DESTROYED, /* no new use of layout allowed */ |
Benny Halevy | e5e9401 | 2010-10-20 00:18:01 -0400 | [diff] [blame] | 54 | }; |
| 55 | |
Ricardo Labiaga | 85e174b | 2010-10-20 00:17:58 -0400 | [diff] [blame] | 56 | /* Per-layout driver specific registration structure */ |
| 57 | struct pnfs_layoutdriver_type { |
Fred Isaman | 02c35fc | 2010-10-20 00:17:59 -0400 | [diff] [blame] | 58 | struct list_head pnfs_tblid; |
| 59 | const u32 id; |
| 60 | const char *name; |
| 61 | struct module *owner; |
Trond Myklebust | 1c78709 | 2010-10-21 16:56:48 -0400 | [diff] [blame] | 62 | int (*set_layoutdriver) (struct nfs_server *); |
| 63 | int (*clear_layoutdriver) (struct nfs_server *); |
Andy Adamson | b1f69b7 | 2010-10-20 00:18:03 -0400 | [diff] [blame] | 64 | struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr); |
| 65 | void (*free_lseg) (struct pnfs_layout_segment *lseg); |
Ricardo Labiaga | 85e174b | 2010-10-20 00:17:58 -0400 | [diff] [blame] | 66 | }; |
| 67 | |
Benny Halevy | e5e9401 | 2010-10-20 00:18:01 -0400 | [diff] [blame] | 68 | struct pnfs_layout_hdr { |
Fred Isaman | cc6e534 | 2011-01-06 11:36:28 +0000 | [diff] [blame] | 69 | atomic_t plh_refcount; |
Fred Isaman | b7edfaa | 2011-01-06 11:36:21 +0000 | [diff] [blame] | 70 | struct list_head plh_layouts; /* other client layouts */ |
Fred Isaman | 43f1b3d | 2011-01-06 11:36:30 +0000 | [diff] [blame^] | 71 | struct list_head plh_bulk_recall; /* clnt list of bulk recalls */ |
Fred Isaman | b7edfaa | 2011-01-06 11:36:21 +0000 | [diff] [blame] | 72 | struct list_head plh_segs; /* layout segments list */ |
Fred Isaman | b7edfaa | 2011-01-06 11:36:21 +0000 | [diff] [blame] | 73 | nfs4_stateid plh_stateid; |
Fred Isaman | cf7d63f | 2011-01-06 11:36:25 +0000 | [diff] [blame] | 74 | atomic_t plh_outstanding; /* number of RPCs out */ |
Fred Isaman | 43f1b3d | 2011-01-06 11:36:30 +0000 | [diff] [blame^] | 75 | u32 plh_barrier; /* ignore lower seqids */ |
Fred Isaman | 566052c | 2011-01-06 11:36:20 +0000 | [diff] [blame] | 76 | unsigned long plh_flags; |
Fred Isaman | b7edfaa | 2011-01-06 11:36:21 +0000 | [diff] [blame] | 77 | struct inode *plh_inode; |
Benny Halevy | e5e9401 | 2010-10-20 00:18:01 -0400 | [diff] [blame] | 78 | }; |
| 79 | |
Andy Adamson | b1f69b7 | 2010-10-20 00:18:03 -0400 | [diff] [blame] | 80 | struct pnfs_device { |
| 81 | struct nfs4_deviceid dev_id; |
| 82 | unsigned int layout_type; |
| 83 | unsigned int mincount; |
| 84 | struct page **pages; |
| 85 | void *area; |
| 86 | unsigned int pgbase; |
| 87 | unsigned int pglen; |
| 88 | }; |
| 89 | |
| 90 | /* |
| 91 | * Device ID RCU cache. A device ID is unique per client ID and layout type. |
| 92 | */ |
| 93 | #define NFS4_DEVICE_ID_HASH_BITS 5 |
| 94 | #define NFS4_DEVICE_ID_HASH_SIZE (1 << NFS4_DEVICE_ID_HASH_BITS) |
| 95 | #define NFS4_DEVICE_ID_HASH_MASK (NFS4_DEVICE_ID_HASH_SIZE - 1) |
| 96 | |
| 97 | static inline u32 |
| 98 | nfs4_deviceid_hash(struct nfs4_deviceid *id) |
| 99 | { |
| 100 | unsigned char *cptr = (unsigned char *)id->data; |
| 101 | unsigned int nbytes = NFS4_DEVICEID4_SIZE; |
| 102 | u32 x = 0; |
| 103 | |
| 104 | while (nbytes--) { |
| 105 | x *= 37; |
| 106 | x += *cptr++; |
| 107 | } |
| 108 | return x & NFS4_DEVICE_ID_HASH_MASK; |
| 109 | } |
| 110 | |
| 111 | struct pnfs_deviceid_node { |
| 112 | struct hlist_node de_node; |
| 113 | struct nfs4_deviceid de_id; |
| 114 | atomic_t de_ref; |
| 115 | }; |
| 116 | |
| 117 | struct pnfs_deviceid_cache { |
| 118 | spinlock_t dc_lock; |
| 119 | atomic_t dc_ref; |
| 120 | void (*dc_free_callback)(struct pnfs_deviceid_node *); |
| 121 | struct hlist_head dc_deviceids[NFS4_DEVICE_ID_HASH_SIZE]; |
| 122 | }; |
| 123 | |
| 124 | extern int pnfs_alloc_init_deviceid_cache(struct nfs_client *, |
| 125 | void (*free_callback)(struct pnfs_deviceid_node *)); |
| 126 | extern void pnfs_put_deviceid_cache(struct nfs_client *); |
| 127 | extern struct pnfs_deviceid_node *pnfs_find_get_deviceid( |
| 128 | struct pnfs_deviceid_cache *, |
| 129 | struct nfs4_deviceid *); |
| 130 | extern struct pnfs_deviceid_node *pnfs_add_deviceid( |
| 131 | struct pnfs_deviceid_cache *, |
| 132 | struct pnfs_deviceid_node *); |
| 133 | extern void pnfs_put_deviceid(struct pnfs_deviceid_cache *c, |
| 134 | struct pnfs_deviceid_node *devid); |
| 135 | |
Fred Isaman | 02c35fc | 2010-10-20 00:17:59 -0400 | [diff] [blame] | 136 | extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *); |
| 137 | extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *); |
| 138 | |
Andy Adamson | b1f69b7 | 2010-10-20 00:18:03 -0400 | [diff] [blame] | 139 | /* nfs4proc.c */ |
| 140 | extern int nfs4_proc_getdeviceinfo(struct nfs_server *server, |
| 141 | struct pnfs_device *dev); |
| 142 | extern int nfs4_proc_layoutget(struct nfs4_layoutget *lgp); |
| 143 | |
| 144 | /* pnfs.c */ |
Fred Isaman | 43f1b3d | 2011-01-06 11:36:30 +0000 | [diff] [blame^] | 145 | void get_layout_hdr(struct pnfs_layout_hdr *lo); |
Benny Halevy | e5e9401 | 2010-10-20 00:18:01 -0400 | [diff] [blame] | 146 | struct pnfs_layout_segment * |
| 147 | pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx, |
| 148 | enum pnfs_iomode access_type); |
Ricardo Labiaga | 85e174b | 2010-10-20 00:17:58 -0400 | [diff] [blame] | 149 | void set_pnfs_layoutdriver(struct nfs_server *, u32 id); |
| 150 | void unset_pnfs_layoutdriver(struct nfs_server *); |
Andy Adamson | b1f69b7 | 2010-10-20 00:18:03 -0400 | [diff] [blame] | 151 | int pnfs_layout_process(struct nfs4_layoutget *lgp); |
Fred Isaman | 43f1b3d | 2011-01-06 11:36:30 +0000 | [diff] [blame^] | 152 | void pnfs_free_lseg_list(struct list_head *tmp_list); |
Benny Halevy | e5e9401 | 2010-10-20 00:18:01 -0400 | [diff] [blame] | 153 | void pnfs_destroy_layout(struct nfs_inode *); |
Andy Adamson | 974cec8 | 2010-10-20 00:18:02 -0400 | [diff] [blame] | 154 | void pnfs_destroy_all_layouts(struct nfs_client *); |
Fred Isaman | cc6e534 | 2011-01-06 11:36:28 +0000 | [diff] [blame] | 155 | void put_layout_hdr(struct pnfs_layout_hdr *lo); |
Fred Isaman | 43f1b3d | 2011-01-06 11:36:30 +0000 | [diff] [blame^] | 156 | void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, |
| 157 | const nfs4_stateid *new, |
| 158 | bool update_barrier); |
Fred Isaman | fd6002e | 2011-01-06 11:36:22 +0000 | [diff] [blame] | 159 | int pnfs_choose_layoutget_stateid(nfs4_stateid *dst, |
| 160 | struct pnfs_layout_hdr *lo, |
| 161 | struct nfs4_state *open_state); |
Fred Isaman | 43f1b3d | 2011-01-06 11:36:30 +0000 | [diff] [blame^] | 162 | int mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, |
| 163 | struct list_head *tmp_list, |
| 164 | u32 iomode); |
Benny Halevy | e5e9401 | 2010-10-20 00:18:01 -0400 | [diff] [blame] | 165 | |
| 166 | |
| 167 | static inline int lo_fail_bit(u32 iomode) |
| 168 | { |
| 169 | return iomode == IOMODE_RW ? |
| 170 | NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED; |
| 171 | } |
| 172 | |
| 173 | /* Return true if a layout driver is being used for this mountpoint */ |
| 174 | static inline int pnfs_enabled_sb(struct nfs_server *nfss) |
| 175 | { |
| 176 | return nfss->pnfs_curr_ld != NULL; |
| 177 | } |
Ricardo Labiaga | 85e174b | 2010-10-20 00:17:58 -0400 | [diff] [blame] | 178 | |
| 179 | #else /* CONFIG_NFS_V4_1 */ |
| 180 | |
Andy Adamson | 974cec8 | 2010-10-20 00:18:02 -0400 | [diff] [blame] | 181 | static inline void pnfs_destroy_all_layouts(struct nfs_client *clp) |
| 182 | { |
| 183 | } |
| 184 | |
Benny Halevy | e5e9401 | 2010-10-20 00:18:01 -0400 | [diff] [blame] | 185 | static inline void pnfs_destroy_layout(struct nfs_inode *nfsi) |
| 186 | { |
| 187 | } |
| 188 | |
| 189 | static inline struct pnfs_layout_segment * |
| 190 | pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx, |
| 191 | enum pnfs_iomode access_type) |
| 192 | { |
| 193 | return NULL; |
| 194 | } |
| 195 | |
Ricardo Labiaga | 85e174b | 2010-10-20 00:17:58 -0400 | [diff] [blame] | 196 | static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id) |
| 197 | { |
| 198 | } |
| 199 | |
| 200 | static inline void unset_pnfs_layoutdriver(struct nfs_server *s) |
| 201 | { |
| 202 | } |
| 203 | |
| 204 | #endif /* CONFIG_NFS_V4_1 */ |
| 205 | |
| 206 | #endif /* FS_NFS_PNFS_H */ |