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29 * This file is part of Lustre, http://www.lustre.org/
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32 * Internal definitions for VVP layer.
34 * Author: Nikita Danilov <nikita.danilov@sun.com>
37 #ifndef VVP_INTERNAL_H
38 #define VVP_INTERNAL_H
40 #include "../include/lustre/lustre_idl.h"
41 #include "../include/cl_object.h"
43 enum obd_notify_event;
53 * IO state private to IO state private to VVP layer.
57 struct cl_io_slice vui_cl;
58 struct cl_io_lock_link vui_link;
60 * I/O vector information to or from which read/write is going.
62 struct iov_iter *vui_iter;
64 * Total size for the left IO.
71 * Inode modification time that is checked across DLM
75 struct vm_area_struct *ft_vma;
77 * locked page returned from vvp_io
79 struct page *ft_vmpage;
83 struct vm_fault *ft_vmf;
85 * fault API used bitflags for return code.
87 unsigned int ft_flags;
89 * check that flags are from filemap_fault
94 struct cl_page_list vui_queue;
95 unsigned long vui_written;
102 * Layout version when this IO is initialized
104 __u32 vui_layout_gen;
106 * File descriptor against which IO is done.
108 struct ll_file_data *vui_fd;
109 struct kiocb *vui_iocb;
111 /* Readahead state. */
112 pgoff_t vui_ra_start;
113 pgoff_t vui_ra_count;
114 /* Set when vui_ra_{start,count} have been initialized. */
118 extern struct lu_device_type vvp_device_type;
120 extern struct lu_context_key vvp_session_key;
121 extern struct lu_context_key vvp_thread_key;
123 extern struct kmem_cache *vvp_lock_kmem;
124 extern struct kmem_cache *vvp_object_kmem;
125 extern struct kmem_cache *vvp_req_kmem;
127 struct vvp_thread_info {
128 struct cl_lock vti_lock;
129 struct cl_lock_descr vti_descr;
131 struct cl_attr vti_attr;
134 static inline struct vvp_thread_info *vvp_env_info(const struct lu_env *env)
136 struct vvp_thread_info *vti;
138 vti = lu_context_key_get(&env->le_ctx, &vvp_thread_key);
144 static inline struct cl_lock *vvp_env_lock(const struct lu_env *env)
146 struct cl_lock *lock = &vvp_env_info(env)->vti_lock;
148 memset(lock, 0, sizeof(*lock));
152 static inline struct cl_attr *vvp_env_thread_attr(const struct lu_env *env)
154 struct cl_attr *attr = &vvp_env_info(env)->vti_attr;
156 memset(attr, 0, sizeof(*attr));
161 static inline struct cl_io *vvp_env_thread_io(const struct lu_env *env)
163 struct cl_io *io = &vvp_env_info(env)->vti_io;
165 memset(io, 0, sizeof(*io));
171 struct vvp_io cs_ios;
174 static inline struct vvp_session *vvp_env_session(const struct lu_env *env)
176 struct vvp_session *ses;
178 ses = lu_context_key_get(env->le_ses, &vvp_session_key);
184 static inline struct vvp_io *vvp_env_io(const struct lu_env *env)
186 return &vvp_env_session(env)->cs_ios;
190 * ccc-private object state.
193 struct cl_object_header vob_header;
194 struct cl_object vob_cl;
195 struct inode *vob_inode;
198 * A list of dirty pages pending IO in the cache. Used by
199 * SOM. Protected by ll_inode_info::lli_lock.
201 * \see vvp_page::vpg_pending_linkage
203 struct list_head vob_pending_list;
206 * Access this counter is protected by inode->i_sem. Now that
207 * the lifetime of transient pages must be covered by inode sem,
208 * we don't need to hold any lock..
210 int vob_transient_pages;
212 * Number of outstanding mmaps on this file.
214 * \see ll_vm_open(), ll_vm_close().
216 atomic_t vob_mmap_cnt;
220 * vob_discard_page_warned
221 * if pages belonging to this object are discarded when a client
222 * is evicted, some debug info will be printed, this flag will be set
223 * during processing the first discarded page, then avoid flooding
224 * debug message for lots of discarded pages.
226 * \see ll_dirty_page_discard_warn.
228 unsigned int vob_discard_page_warned:1;
232 * VVP-private page state.
235 struct cl_page_slice vpg_cl;
236 int vpg_defer_uptodate;
238 int vpg_write_queued;
240 * Non-empty iff this page is already counted in
241 * vvp_object::vob_pending_list. This list is only used as a flag,
242 * that is, never iterated through, only checked for list_empty(), but
243 * having a list is useful for debugging.
245 struct list_head vpg_pending_linkage;
247 struct page *vpg_page;
250 static inline struct vvp_page *cl2vvp_page(const struct cl_page_slice *slice)
252 return container_of(slice, struct vvp_page, vpg_cl);
255 static inline pgoff_t vvp_index(struct vvp_page *vvp)
257 return vvp->vpg_cl.cpl_index;
261 struct cl_device vdv_cl;
262 struct super_block *vdv_sb;
263 struct cl_device *vdv_next;
267 struct cl_lock_slice vlk_cl;
271 struct cl_req_slice vrq_cl;
274 void *ccc_key_init(const struct lu_context *ctx,
275 struct lu_context_key *key);
276 void ccc_key_fini(const struct lu_context *ctx,
277 struct lu_context_key *key, void *data);
279 void ccc_umount(const struct lu_env *env, struct cl_device *dev);
281 static inline struct lu_device *vvp2lu_dev(struct vvp_device *vdv)
283 return &vdv->vdv_cl.cd_lu_dev;
286 static inline struct vvp_device *lu2vvp_dev(const struct lu_device *d)
288 return container_of0(d, struct vvp_device, vdv_cl.cd_lu_dev);
291 static inline struct vvp_device *cl2vvp_dev(const struct cl_device *d)
293 return container_of0(d, struct vvp_device, vdv_cl);
296 static inline struct vvp_object *cl2vvp(const struct cl_object *obj)
298 return container_of0(obj, struct vvp_object, vob_cl);
301 static inline struct vvp_object *lu2vvp(const struct lu_object *obj)
303 return container_of0(obj, struct vvp_object, vob_cl.co_lu);
306 static inline struct inode *vvp_object_inode(const struct cl_object *obj)
308 return cl2vvp(obj)->vob_inode;
311 int vvp_object_invariant(const struct cl_object *obj);
312 struct vvp_object *cl_inode2vvp(struct inode *inode);
314 static inline struct page *cl2vm_page(const struct cl_page_slice *slice)
316 return cl2vvp_page(slice)->vpg_page;
319 static inline struct vvp_lock *cl2vvp_lock(const struct cl_lock_slice *slice)
321 return container_of(slice, struct vvp_lock, vlk_cl);
324 # define CLOBINVRNT(env, clob, expr) \
325 ((void)sizeof(env), (void)sizeof(clob), (void)sizeof(!!(expr)))
328 * New interfaces to get and put lov_stripe_md from lov layer. This violates
329 * layering because lov_stripe_md is supposed to be a private data in lov.
331 * NB: If you find you have to use these interfaces for your new code, please
332 * think about it again. These interfaces may be removed in the future for
335 struct lov_stripe_md *lov_lsm_get(struct cl_object *clobj);
336 void lov_lsm_put(struct cl_object *clobj, struct lov_stripe_md *lsm);
337 int lov_read_and_clear_async_rc(struct cl_object *clob);
339 struct lov_stripe_md *ccc_inode_lsm_get(struct inode *inode);
340 void ccc_inode_lsm_put(struct inode *inode, struct lov_stripe_md *lsm);
342 int vvp_io_init(const struct lu_env *env, struct cl_object *obj,
344 int vvp_io_write_commit(const struct lu_env *env, struct cl_io *io);
345 int vvp_lock_init(const struct lu_env *env, struct cl_object *obj,
346 struct cl_lock *lock, const struct cl_io *io);
347 int vvp_page_init(const struct lu_env *env, struct cl_object *obj,
348 struct cl_page *page, pgoff_t index);
349 int vvp_req_init(const struct lu_env *env, struct cl_device *dev,
351 struct lu_object *vvp_object_alloc(const struct lu_env *env,
352 const struct lu_object_header *hdr,
353 struct lu_device *dev);
355 int vvp_global_init(void);
356 void vvp_global_fini(void);
358 extern const struct file_operations vvp_dump_pgcache_file_ops;
360 #endif /* VVP_INTERNAL_H */