1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #ifndef _SYS_FEM_H 27 #define _SYS_FEM_H 28 29 #pragma ident "%Z%%M% %I% %E% SMI" 30 31 #include <sys/types.h> 32 #include <sys/mutex.h> 33 #include <sys/pathname.h> 34 #include <sys/uio.h> 35 #include <sys/file.h> 36 #include <sys/cred.h> 37 #include <sys/vfs.h> 38 #include <sys/vnode.h> 39 40 41 #ifdef __cplusplus 42 extern "C" { 43 #endif 44 45 #ifdef _KERNEL 46 47 struct fs_operation_def; /* from vfs.h */ 48 49 /* 50 * overview: 51 * 52 * fem - file event monitoring 53 * 54 * File Event Monitoring is a formalized mechanism to monitor events on a 55 * vnode or vfs by intercepting the vnode/vfs operations. The framework enables 56 * the consumer to request event notifications for specified files and 57 * directories. The consumers, which intercept the events, are responsible for 58 * delivering the event to the next interceptor or the terminal destination. 59 * 60 */ 61 62 /* 63 * protocol: 64 * 65 * vnode -> fem_head. 66 * There can only be one fem_head for a vnode. 67 * Once attached, the fem_head persists until explicitly detached 68 * or the vnode expires. 69 * 70 * fem_head -> fem_list. 71 * There can be many lists for a head, as each reconfiguration of 72 * the list causes a new one to be created and initialized from the 73 * old one. For this reason, modules cannot assume that they can 74 * reach thier list by vnode->fem_head->fem_list->list[n] == mod; 75 * 76 * fem_arg -> vnode, &vnode. 77 * This relationship is established at the head of the call (ie. in 78 * femhead_open()) where the fem_arg is allocated. Intermediate nodes 79 * have direct access to this. 80 * 81 * fem_arg -> fem_node 82 * This relationship is established at the head of the call (ie. in 83 * femhead_open()) where the fem_arg is allocated. The fem_arg is 84 * updated as intermediate nodes are invoked, however not as they 85 * return. For this reason, nodes which are interested in maintaining 86 * context following a "next" should store a copy of the fem_available 87 * field before invoking the 'next'. 88 */ 89 typedef struct fem_arg femarg_t, fsemarg_t; 90 typedef struct fem fem_t; 91 typedef struct fsem fsem_t; 92 93 typedef int femop_t(); 94 95 /* 96 * The following enumerations specify the conditions 97 * under which a monitor (operation/argument combination) 98 * should be installed. These are used when calling 99 * fem_install() and fsem_install() 100 */ 101 typedef enum femhow { 102 FORCE = 0, /* Force the installation of this monitor */ 103 OPUNIQ = 1, /* Install if operation set is unique */ 104 OPARGUNIQ = 2 /* Install if op/arg combination is unique */ 105 } femhow_t; 106 107 struct fem_node { 108 void *fn_available; 109 union { 110 fem_t *fem; 111 vnodeops_t *vnode; 112 fsem_t *fsem; 113 vfsops_t *vfs; 114 void *anon; /* anonymous, for updates */ 115 } fn_op; 116 void (*fn_av_hold)(void *); /* Hold for "fn_available" */ 117 void (*fn_av_rele)(void *); /* Release for "fn_available" */ 118 }; 119 120 struct fem_arg { 121 union { 122 vnode_t *vp, 123 **vpp; 124 vfs_t *vfsp; 125 void *anon; 126 } fa_vnode; 127 struct fem_node *fa_fnode; 128 }; 129 130 131 struct fem_list { 132 uint_t feml_refc; /* reference count */ 133 int feml_tos; /* top of stack pointer(index) */ 134 int feml_ssize; /* stack size */ 135 int feml_pad; /* alignment */ 136 struct fem_node feml_nodes[1]; /* variable bounds */ 137 }; 138 139 struct fem_head { 140 kmutex_t femh_lock; 141 struct fem_list *femh_list; 142 }; 143 144 /* 145 * FEM_OPS defines all the FEM operations. It is used to define 146 * the fem structure (below) and the fs_func_p union (vfs_opreg.h). 147 */ 148 #define FEM_OPS \ 149 int (*femop_open)(femarg_t *vf, int mode, cred_t *cr); \ 150 int (*femop_close)(femarg_t *vf, int flag, int count, \ 151 offset_t offset, cred_t *cr); \ 152 int (*femop_read)(femarg_t *vf, uio_t *uiop, int ioflag, \ 153 cred_t *cr, struct caller_context *ct); \ 154 int (*femop_write)(femarg_t *vf, uio_t *uiop, int ioflag, \ 155 cred_t *cr, struct caller_context *ct); \ 156 int (*femop_ioctl)(femarg_t *vf, int cmd, intptr_t arg, \ 157 int flag, cred_t *cr, int *rvalp); \ 158 int (*femop_setfl)(femarg_t *vf, int oflags, int nflags, \ 159 cred_t *cr); \ 160 int (*femop_getattr)(femarg_t *vf, vattr_t *vap, int flags, \ 161 cred_t *cr); \ 162 int (*femop_setattr)(femarg_t *vf, vattr_t *vap, int flags, \ 163 cred_t *cr, caller_context_t *ct); \ 164 int (*femop_access)(femarg_t *vf, int mode, int flags, \ 165 cred_t *cr); \ 166 int (*femop_lookup)(femarg_t *vf, char *nm, vnode_t **vpp, \ 167 pathname_t *pnp, int flags, vnode_t *rdir, \ 168 cred_t *cr); \ 169 int (*femop_create)(femarg_t *vf, char *name, vattr_t *vap, \ 170 vcexcl_t excl, int mode, vnode_t **vpp, \ 171 cred_t *cr, int flag); \ 172 int (*femop_remove)(femarg_t *vf, char *nm, cred_t *cr); \ 173 int (*femop_link)(femarg_t *vf, vnode_t *svp, char *tnm, \ 174 cred_t *cr); \ 175 int (*femop_rename)(femarg_t *vf, char *snm, vnode_t *tdvp, \ 176 char *tnm, cred_t *cr); \ 177 int (*femop_mkdir)(femarg_t *vf, char *dirname, vattr_t *vap, \ 178 vnode_t **vpp, cred_t *cr); \ 179 int (*femop_rmdir)(femarg_t *vf, char *nm, vnode_t *cdir, \ 180 cred_t *cr); \ 181 int (*femop_readdir)(femarg_t *vf, uio_t *uiop, cred_t *cr, \ 182 int *eofp); \ 183 int (*femop_symlink)(femarg_t *vf, char *linkname, \ 184 vattr_t *vap, char *target, cred_t *cr); \ 185 int (*femop_readlink)(femarg_t *vf, uio_t *uiop, cred_t *cr); \ 186 int (*femop_fsync)(femarg_t *vf, int syncflag, cred_t *cr); \ 187 void (*femop_inactive)(femarg_t *vf, cred_t *cr); \ 188 int (*femop_fid)(femarg_t *vf, fid_t *fidp); \ 189 int (*femop_rwlock)(femarg_t *vf, int write_lock, \ 190 caller_context_t *ct); \ 191 void (*femop_rwunlock)(femarg_t *vf, int write_lock, \ 192 caller_context_t *ct); \ 193 int (*femop_seek)(femarg_t *vf, offset_t ooff, \ 194 offset_t *noffp); \ 195 int (*femop_cmp)(femarg_t *vf, vnode_t *vp2); \ 196 int (*femop_frlock)(femarg_t *vf, int cmd, struct flock64 *bfp, \ 197 int flag, offset_t offset, \ 198 struct flk_callback *flk_cbp, cred_t *cr); \ 199 int (*femop_space)(femarg_t *vf, int cmd, struct flock64 *bfp, \ 200 int flag, offset_t offset, cred_t *cr, \ 201 caller_context_t *ct); \ 202 int (*femop_realvp)(femarg_t *vf, vnode_t **vpp); \ 203 int (*femop_getpage)(femarg_t *vf, offset_t off, size_t len, \ 204 uint_t *protp, struct page **plarr, \ 205 size_t plsz, struct seg *seg, caddr_t addr, \ 206 enum seg_rw rw, cred_t *cr); \ 207 int (*femop_putpage)(femarg_t *vf, offset_t off, size_t len, \ 208 int flags, cred_t *cr); \ 209 int (*femop_map)(femarg_t *vf, offset_t off, struct as *as, \ 210 caddr_t *addrp, size_t len, uchar_t prot, \ 211 uchar_t maxprot, uint_t flags, cred_t *cr); \ 212 int (*femop_addmap)(femarg_t *vf, offset_t off, struct as *as, \ 213 caddr_t addr, size_t len, uchar_t prot, \ 214 uchar_t maxprot, uint_t flags, cred_t *cr); \ 215 int (*femop_delmap)(femarg_t *vf, offset_t off, struct as *as, \ 216 caddr_t addr, size_t len, uint_t prot, \ 217 uint_t maxprot, uint_t flags, cred_t *cr); \ 218 int (*femop_poll)(femarg_t *vf, short events, int anyyet, \ 219 short *reventsp, struct pollhead **phpp); \ 220 int (*femop_dump)(femarg_t *vf, caddr_t addr, int lbdn, \ 221 int dblks); \ 222 int (*femop_pathconf)(femarg_t *vf, int cmd, ulong_t *valp, \ 223 cred_t *cr); \ 224 int (*femop_pageio)(femarg_t *vf, struct page *pp, \ 225 u_offset_t io_off, size_t io_len, int flags, \ 226 cred_t *cr); \ 227 int (*femop_dumpctl)(femarg_t *vf, int action, int *blkp); \ 228 void (*femop_dispose)(femarg_t *vf, struct page *pp, int flag, \ 229 int dn, cred_t *cr); \ 230 int (*femop_setsecattr)(femarg_t *vf, vsecattr_t *vsap, \ 231 int flag, cred_t *cr); \ 232 int (*femop_getsecattr)(femarg_t *vf, vsecattr_t *vsap, \ 233 int flag, cred_t *cr); \ 234 int (*femop_shrlock)(femarg_t *vf, int cmd, \ 235 struct shrlock *shr, int flag, cred_t *cr); \ 236 int (*femop_vnevent)(femarg_t *vf, vnevent_t vnevent, \ 237 vnode_t *dvp, char *cname) 238 /* NB: No ";" */ 239 240 struct fem { 241 const char *name; 242 const struct fs_operation_def *templ; 243 FEM_OPS; /* Signatures of all FEM operations (femops) */ 244 }; 245 246 /* 247 * FSEM_OPS defines all the FSEM operations. It is used to define 248 * the fsem structure (below) and the fs_func_p union (vfs_opreg.h). 249 */ 250 #define FSEM_OPS \ 251 int (*fsemop_mount)(fsemarg_t *vf, vnode_t *mvp, \ 252 struct mounta *uap, cred_t *cr); \ 253 int (*fsemop_unmount)(fsemarg_t *vf, int flag, cred_t *cr); \ 254 int (*fsemop_root)(fsemarg_t *vf, vnode_t **vpp); \ 255 int (*fsemop_statvfs)(fsemarg_t *vf, statvfs64_t *sp); \ 256 int (*fsemop_sync)(fsemarg_t *vf, short flag, cred_t *cr); \ 257 int (*fsemop_vget)(fsemarg_t *vf, vnode_t **vpp, fid_t *fidp); \ 258 int (*fsemop_mountroot)(fsemarg_t *vf, \ 259 enum whymountroot reason); \ 260 void (*fsemop_freevfs)(fsemarg_t *vf); \ 261 int (*fsemop_vnstate)(fsemarg_t *vf, vnode_t *vp, \ 262 vntrans_t nstate) /* NB: No ";" */ 263 264 struct fsem { 265 const char *name; 266 const struct fs_operation_def *templ; 267 FSEM_OPS; /* Signatures of all FSEM operations (fsemops) */ 268 }; 269 270 extern int vnext_open(femarg_t *vf, int mode, cred_t *cr); 271 extern int vnext_close(femarg_t *vf, int flag, int count, offset_t offset, 272 cred_t *cr); 273 extern int vnext_read(femarg_t *vf, uio_t *uiop, int ioflag, cred_t *cr, 274 struct caller_context *ct); 275 extern int vnext_write(femarg_t *vf, uio_t *uiop, int ioflag, cred_t *cr, 276 struct caller_context *ct); 277 extern int vnext_ioctl(femarg_t *vf, int cmd, intptr_t arg, int flag, 278 cred_t *cr, int *rvalp); 279 extern int vnext_setfl(femarg_t *vf, int oflags, int nflags, cred_t *cr); 280 extern int vnext_getattr(femarg_t *vf, vattr_t *vap, int flags, cred_t *cr); 281 extern int vnext_setattr(femarg_t *vf, vattr_t *vap, int flags, cred_t *cr, 282 caller_context_t *ct); 283 extern int vnext_access(femarg_t *vf, int mode, int flags, cred_t *cr); 284 extern int vnext_lookup(femarg_t *vf, char *nm, vnode_t **vpp, 285 pathname_t *pnp, int flags, vnode_t *rdir, 286 cred_t *cr); 287 extern int vnext_create(femarg_t *vf, char *name, vattr_t *vap, 288 vcexcl_t excl, int mode, vnode_t **vpp, cred_t *cr, 289 int flag); 290 extern int vnext_remove(femarg_t *vf, char *nm, cred_t *cr); 291 extern int vnext_link(femarg_t *vf, vnode_t *svp, char *tnm, cred_t *cr); 292 extern int vnext_rename(femarg_t *vf, char *snm, vnode_t *tdvp, char *tnm, 293 cred_t *cr); 294 extern int vnext_mkdir(femarg_t *vf, char *dirname, vattr_t *vap, 295 vnode_t **vpp, cred_t *cr); 296 extern int vnext_rmdir(femarg_t *vf, char *nm, vnode_t *cdir, cred_t *cr); 297 extern int vnext_readdir(femarg_t *vf, uio_t *uiop, cred_t *cr, int *eofp); 298 extern int vnext_symlink(femarg_t *vf, char *linkname, vattr_t *vap, 299 char *target, cred_t *cr); 300 extern int vnext_readlink(femarg_t *vf, uio_t *uiop, cred_t *cr); 301 extern int vnext_fsync(femarg_t *vf, int syncflag, cred_t *cr); 302 extern void vnext_inactive(femarg_t *vf, cred_t *cr); 303 extern int vnext_fid(femarg_t *vf, fid_t *fidp); 304 extern int vnext_rwlock(femarg_t *vf, int write_lock, caller_context_t *ct); 305 extern void vnext_rwunlock(femarg_t *vf, int write_lock, caller_context_t *ct); 306 extern int vnext_seek(femarg_t *vf, offset_t ooff, offset_t *noffp); 307 extern int vnext_cmp(femarg_t *vf, vnode_t *vp2); 308 extern int vnext_frlock(femarg_t *vf, int cmd, struct flock64 *bfp, 309 int flag, offset_t offset, 310 struct flk_callback *flk_cbp, cred_t *cr); 311 extern int vnext_space(femarg_t *vf, int cmd, struct flock64 *bfp, 312 int flag, offset_t offset, cred_t *cr, 313 caller_context_t *ct); 314 extern int vnext_realvp(femarg_t *vf, vnode_t **vpp); 315 extern int vnext_getpage(femarg_t *vf, offset_t off, size_t len, 316 uint_t *protp, struct page **plarr, size_t plsz, 317 struct seg *seg, caddr_t addr, enum seg_rw rw, 318 cred_t *cr); 319 extern int vnext_putpage(femarg_t *vf, offset_t off, size_t len, int flags, 320 cred_t *cr); 321 extern int vnext_map(femarg_t *vf, offset_t off, struct as *as, 322 caddr_t *addrp, size_t len, uchar_t prot, uchar_t maxprot, 323 uint_t flags, cred_t *cr); 324 extern int vnext_addmap(femarg_t *vf, offset_t off, struct as *as, 325 caddr_t addr, size_t len, uchar_t prot, 326 uchar_t maxprot, uint_t flags, cred_t *cr); 327 extern int vnext_delmap(femarg_t *vf, offset_t off, struct as *as, 328 caddr_t addr, size_t len, uint_t prot, 329 uint_t maxprot, uint_t flags, cred_t *cr); 330 extern int vnext_poll(femarg_t *vf, short events, int anyyet, 331 short *reventsp, struct pollhead **phpp); 332 extern int vnext_dump(femarg_t *vf, caddr_t addr, int lbdn, int dblks); 333 extern int vnext_pathconf(femarg_t *vf, int cmd, ulong_t *valp, cred_t *cr); 334 extern int vnext_pageio(femarg_t *vf, struct page *pp, u_offset_t io_off, 335 size_t io_len, int flags, cred_t *cr); 336 extern int vnext_dumpctl(femarg_t *vf, int action, int *blkp); 337 extern void vnext_dispose(femarg_t *vf, struct page *pp, int flag, int dn, 338 cred_t *cr); 339 extern int vnext_setsecattr(femarg_t *vf, vsecattr_t *vsap, int flag, 340 cred_t *cr); 341 extern int vnext_getsecattr(femarg_t *vf, vsecattr_t *vsap, int flag, 342 cred_t *cr); 343 extern int vnext_shrlock(femarg_t *vf, int cmd, struct shrlock *shr, 344 int flag, cred_t *cr); 345 extern int vnext_vnevent(femarg_t *vf, vnevent_t vevent, vnode_t *dvp, 346 char *cname); 347 348 extern int vfsnext_mount(fsemarg_t *vf, vnode_t *mvp, struct mounta *uap, 349 cred_t *cr); 350 extern int vfsnext_unmount(fsemarg_t *vf, int flag, cred_t *cr); 351 extern int vfsnext_root(fsemarg_t *vf, vnode_t **vpp); 352 extern int vfsnext_statvfs(fsemarg_t *vf, statvfs64_t *sp); 353 extern int vfsnext_sync(fsemarg_t *vf, short flag, cred_t *cr); 354 extern int vfsnext_vget(fsemarg_t *vf, vnode_t **vpp, fid_t *fidp); 355 extern int vfsnext_mountroot(fsemarg_t *vf, enum whymountroot reason); 356 extern void vfsnext_freevfs(fsemarg_t *vf); 357 extern int vfsnext_vnstate(fsemarg_t *vf, vnode_t *vp, vntrans_t nstate); 358 359 360 extern void fem_init(void); /* called once, by startup */ 361 362 /* fem api */ 363 extern int fem_create(char *name, const struct fs_operation_def *templ, 364 fem_t **actual); 365 extern void fem_free(fem_t *fem); 366 extern int fem_install(struct vnode *v, fem_t *mon, void *arg, femhow_t how, 367 void (*arg_hold)(void *), void (*arg_rele)(void *)); 368 extern int fem_is_installed(struct vnode *v, fem_t *mon, void *arg); 369 extern int fem_uninstall(struct vnode *v, fem_t *mon, void *arg); 370 extern vnodeops_t *fem_getvnops(struct vnode *v); 371 extern void fem_setvnops(struct vnode *v, struct vnodeops *nops); 372 373 374 extern int fsem_create(char *name, const struct fs_operation_def *templ, 375 fsem_t **actual); 376 extern void fsem_free(fsem_t *fsem); 377 extern int fsem_is_installed(struct vfs *v, fsem_t *mon, void *arg); 378 extern int fsem_install(struct vfs *v, fsem_t *mon, void *arg, femhow_t how, 379 void (*arg_hold)(void *), void (*arg_rele)(void *)); 380 extern int fsem_uninstall(struct vfs *v, fsem_t *mon, void *arg); 381 extern vfsops_t *fsem_getvfsops(struct vfs *v); 382 extern void fsem_setvfsops(struct vfs *v, struct vfsops *nops); 383 384 #endif /* _KERNEL */ 385 386 #ifdef __cplusplus 387 } 388 #endif 389 390 #endif /* _SYS_FEM_H */ 391