181 * "rootvfs".
182 * File system implementations should not access this list;
183 * it's intended for use only in the kernel's vfs layer.
184 *
185 * Each zone also has its own list of mounts, containing filesystems mounted
186 * somewhere within the filesystem tree rooted at the zone's rootpath. The
187 * list is doubly linked to match the global list.
188 *
189 * mnttab locking: the in-kernel mnttab uses the vfs_mntpt, vfs_resource and
190 * vfs_mntopts fields in the vfs_t. mntpt and resource are refstr_ts that
191 * are set at mount time and can only be modified during a remount.
192 * It is safe to read these fields if you can prevent a remount on the vfs,
193 * or through the convenience funcs vfs_getmntpoint() and vfs_getresource().
194 * The mntopts field may only be accessed through the provided convenience
195 * functions, as it is protected by the vfs list lock. Modifying a mount
196 * option requires grabbing the vfs list write lock, which can be a very
197 * high latency lock.
198 */
199 struct zone; /* from zone.h */
200 struct fem_head; /* from fem.h */
201
202 typedef struct vfs {
203 struct vfs *vfs_next; /* next VFS in VFS list */
204 struct vfs *vfs_prev; /* prev VFS in VFS list */
205
206 /* vfs_op should not be used directly. Accessor functions are provided */
207 vfsops_t *vfs_op; /* operations on VFS */
208
209 struct vnode *vfs_vnodecovered; /* vnode mounted on */
210 uint_t vfs_flag; /* flags */
211 uint_t vfs_bsize; /* native block size */
212 int vfs_fstype; /* file system type index */
213 fsid_t vfs_fsid; /* file system id */
214 void *vfs_data; /* private data */
215 dev_t vfs_dev; /* device of mounted VFS */
216 ulong_t vfs_bcount; /* I/O count (accounting) */
217 struct vfs *vfs_list; /* sync list pointer */
218 struct vfs *vfs_hash; /* hash list pointer */
219 ksema_t vfs_reflock; /* mount/unmount/sync lock */
220 uint_t vfs_count; /* vfs reference count */
221 mntopts_t vfs_mntopts; /* options mounted with */
222 refstr_t *vfs_resource; /* mounted resource name */
223 refstr_t *vfs_mntpt; /* mount point name */
224 time_t vfs_mtime; /* time we were mounted */
225 struct vfs_impl *vfs_implp; /* impl specific data */
226 /*
227 * Zones support. Note that the zone that "owns" the mount isn't
228 * necessarily the same as the zone in which the zone is visible.
229 * That is, vfs_zone and (vfs_zone_next|vfs_zone_prev) may refer to
230 * different zones.
231 */
232 struct zone *vfs_zone; /* zone that owns the mount */
233 struct vfs *vfs_zone_next; /* next VFS visible in zone */
234 struct vfs *vfs_zone_prev; /* prev VFS visible in zone */
235
236 struct fem_head *vfs_femhead; /* fs monitoring */
237 minor_t vfs_lofi_minor; /* minor if lofi mount */
238 } vfs_t;
239
240 #define vfs_featureset vfs_implp->vi_featureset
241 #define vfs_vskap vfs_implp->vi_vskap
242 #define vfs_fstypevsp vfs_implp->vi_fstypevsp
243 #define vfs_vopstats vfs_implp->vi_vopstats
244 #define vfs_hrctime vfs_implp->vi_hrctime
245
246 /*
247 * VFS flags.
248 */
249 #define VFS_RDONLY 0x01 /* read-only vfs */
250 #define VFS_NOMNTTAB 0x02 /* vfs not seen in mnttab */
251 #define VFS_NOSETUID 0x08 /* setuid disallowed */
252 #define VFS_REMOUNT 0x10 /* modify mount options only */
253 #define VFS_NOTRUNC 0x20 /* does not truncate long file names */
254 #define VFS_UNLINKABLE 0x40 /* unlink(2) can be applied to root */
255 #define VFS_PXFS 0x80 /* clustering: global fs proxy vfs */
256 #define VFS_UNMOUNTED 0x100 /* file system has been unmounted */
257 #define VFS_NBMAND 0x200 /* allow non-blocking mandatory locks */
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181 * "rootvfs".
182 * File system implementations should not access this list;
183 * it's intended for use only in the kernel's vfs layer.
184 *
185 * Each zone also has its own list of mounts, containing filesystems mounted
186 * somewhere within the filesystem tree rooted at the zone's rootpath. The
187 * list is doubly linked to match the global list.
188 *
189 * mnttab locking: the in-kernel mnttab uses the vfs_mntpt, vfs_resource and
190 * vfs_mntopts fields in the vfs_t. mntpt and resource are refstr_ts that
191 * are set at mount time and can only be modified during a remount.
192 * It is safe to read these fields if you can prevent a remount on the vfs,
193 * or through the convenience funcs vfs_getmntpoint() and vfs_getresource().
194 * The mntopts field may only be accessed through the provided convenience
195 * functions, as it is protected by the vfs list lock. Modifying a mount
196 * option requires grabbing the vfs list write lock, which can be a very
197 * high latency lock.
198 */
199 struct zone; /* from zone.h */
200 struct fem_head; /* from fem.h */
201 struct fsh_fsrecord; /* from fsh_impl.h */
202
203 typedef struct vfs {
204 struct vfs *vfs_next; /* next VFS in VFS list */
205 struct vfs *vfs_prev; /* prev VFS in VFS list */
206
207 /* vfs_op should not be used directly. Accessor functions are provided */
208 vfsops_t *vfs_op; /* operations on VFS */
209
210 struct vnode *vfs_vnodecovered; /* vnode mounted on */
211 uint_t vfs_flag; /* flags */
212 uint_t vfs_bsize; /* native block size */
213 int vfs_fstype; /* file system type index */
214 fsid_t vfs_fsid; /* file system id */
215 void *vfs_data; /* private data */
216 dev_t vfs_dev; /* device of mounted VFS */
217 ulong_t vfs_bcount; /* I/O count (accounting) */
218 struct vfs *vfs_list; /* sync list pointer */
219 struct vfs *vfs_hash; /* hash list pointer */
220 ksema_t vfs_reflock; /* mount/unmount/sync lock */
221 uint_t vfs_count; /* vfs reference count */
222 mntopts_t vfs_mntopts; /* options mounted with */
223 refstr_t *vfs_resource; /* mounted resource name */
224 refstr_t *vfs_mntpt; /* mount point name */
225 time_t vfs_mtime; /* time we were mounted */
226 struct vfs_impl *vfs_implp; /* impl specific data */
227 /*
228 * Zones support. Note that the zone that "owns" the mount isn't
229 * necessarily the same as the zone in which the zone is visible.
230 * That is, vfs_zone and (vfs_zone_next|vfs_zone_prev) may refer to
231 * different zones.
232 */
233 struct zone *vfs_zone; /* zone that owns the mount */
234 struct vfs *vfs_zone_next; /* next VFS visible in zone */
235 struct vfs *vfs_zone_prev; /* prev VFS visible in zone */
236
237 struct fem_head *vfs_femhead; /* fs monitoring */
238 minor_t vfs_lofi_minor; /* minor if lofi mount */
239
240 struct fsh_fsrecord *vfs_fshrecord; /* filesystem hooking */
241 } vfs_t;
242
243 #define vfs_featureset vfs_implp->vi_featureset
244 #define vfs_vskap vfs_implp->vi_vskap
245 #define vfs_fstypevsp vfs_implp->vi_fstypevsp
246 #define vfs_vopstats vfs_implp->vi_vopstats
247 #define vfs_hrctime vfs_implp->vi_hrctime
248
249 /*
250 * VFS flags.
251 */
252 #define VFS_RDONLY 0x01 /* read-only vfs */
253 #define VFS_NOMNTTAB 0x02 /* vfs not seen in mnttab */
254 #define VFS_NOSETUID 0x08 /* setuid disallowed */
255 #define VFS_REMOUNT 0x10 /* modify mount options only */
256 #define VFS_NOTRUNC 0x20 /* does not truncate long file names */
257 #define VFS_UNLINKABLE 0x40 /* unlink(2) can be applied to root */
258 #define VFS_PXFS 0x80 /* clustering: global fs proxy vfs */
259 #define VFS_UNMOUNTED 0x100 /* file system has been unmounted */
260 #define VFS_NBMAND 0x200 /* allow non-blocking mandatory locks */
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