/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright (c) 1988, 2010, Oracle and/or its affiliates. All rights reserved. * Copyright 2016 Nexenta Systems, Inc. * Copyright 2016 Toomas Soome */ /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ /* All Rights Reserved */ /* * Portions of this source code were derived from Berkeley 4.3 BSD * under license from the Regents of the University of California. */ #ifndef _SYS_VFS_H #define _SYS_VFS_H #include #include #include #include #include #include #include #include #include #ifdef __cplusplus extern "C" { #endif /* * Data associated with mounted file systems. */ /* * Operations vector. This is used internal to the kernel; file systems * supply their list of operations via vfs_setfsops(). */ typedef struct vfsops vfsops_t; /* * File system identifier. Should be unique (at least per machine). */ typedef struct { int val[2]; /* file system id type */ } fsid_t; /* * File identifier. Should be unique per filesystem on a single * machine. This is typically called by a stateless file server * in order to generate "file handles". * * Many underlying file systems cast a struct fid into other * file system dependent structures which may require 4 byte alignment. * Because a fid starts with a short it may not be 4 byte aligned, the * fid_pad will force the alignment. */ #define MAXFIDSZ 64 #define OLD_MAXFIDSZ 16 typedef struct fid { union { long fid_pad; struct { ushort_t len; /* length of data in bytes */ char data[MAXFIDSZ]; /* data (variable len) */ } _fid; } un; } fid_t; #ifdef _SYSCALL32 /* * Solaris 64 - use old-style cache format with 32-bit aligned fid for on-disk * struct compatibility. */ typedef struct fid32 { union { int32_t fid_pad; struct { uint16_t len; /* length of data in bytes */ char data[MAXFIDSZ]; /* data (variable len) */ } _fid; } un; } fid32_t; #else /* not _SYSCALL32 */ #define fid32 fid typedef fid_t fid32_t; #endif /* _SYSCALL32 */ #define fid_len un._fid.len #define fid_data un._fid.data /* * Structure defining a mount option for a filesystem. * option names are found in mntent.h */ typedef struct mntopt { char *mo_name; /* option name */ char **mo_cancel; /* list of options cancelled by this one */ char *mo_arg; /* argument string for this option */ int mo_flags; /* flags for this mount option */ void *mo_data; /* filesystem specific data */ } mntopt_t; /* * Flags that apply to mount options */ #define MO_SET 0x01 /* option is set */ #define MO_NODISPLAY 0x02 /* option not listed in mnttab */ #define MO_HASVALUE 0x04 /* option takes a value */ #define MO_IGNORE 0x08 /* option ignored by parser */ #define MO_DEFAULT MO_SET /* option is on by default */ #define MO_TAG 0x10 /* flags a tag set by user program */ #define MO_EMPTY 0x20 /* empty space in option table */ #define VFS_NOFORCEOPT 0x01 /* honor MO_IGNORE (don't set option) */ #define VFS_DISPLAY 0x02 /* Turn off MO_NODISPLAY bit for opt */ #define VFS_NODISPLAY 0x04 /* Turn on MO_NODISPLAY bit for opt */ #define VFS_CREATEOPT 0x08 /* Create the opt if it's not there */ /* * Structure holding mount option strings for the mounted file system. */ typedef struct mntopts { uint_t mo_count; /* number of entries in table */ mntopt_t *mo_list; /* list of mount options */ } mntopts_t; /* * The kstat structures associated with the vopstats are kept in an * AVL tree. This is to avoid the case where a file system does not * use a unique fsid_t for each vfs (e.g., namefs). In order to do * this, we need a structure that the AVL tree can use that also * references the kstat. * Note that the vks_fsid is generated from the value reported by * VFS_STATVFS(). */ typedef struct vskstat_anchor { avl_node_t vsk_node; /* Required for use by AVL routines */ kstat_t *vsk_ksp; /* kstat structure for vopstats */ ulong_t vsk_fsid; /* fsid associated w/this FS */ } vsk_anchor_t; extern avl_tree_t vskstat_tree; extern kmutex_t vskstat_tree_lock; /* * Structure per mounted file system. Each mounted file system has * an array of operations and an instance record. * * The file systems are kept on a doubly linked circular list headed by * "rootvfs". * File system implementations should not access this list; * it's intended for use only in the kernel's vfs layer. * * Each zone also has its own list of mounts, containing filesystems mounted * somewhere within the filesystem tree rooted at the zone's rootpath. The * list is doubly linked to match the global list. * * mnttab locking: the in-kernel mnttab uses the vfs_mntpt, vfs_resource and * vfs_mntopts fields in the vfs_t. mntpt and resource are refstr_ts that * are set at mount time and can only be modified during a remount. * It is safe to read these fields if you can prevent a remount on the vfs, * or through the convenience funcs vfs_getmntpoint() and vfs_getresource(). * The mntopts field may only be accessed through the provided convenience * functions, as it is protected by the vfs list lock. Modifying a mount * option requires grabbing the vfs list write lock, which can be a very * high latency lock. */ struct zone; /* from zone.h */ struct fem_head; /* from fem.h */ typedef struct vfs { struct vfs *vfs_next; /* next VFS in VFS list */ struct vfs *vfs_prev; /* prev VFS in VFS list */ avl_node_t vfs_avldev; /* by dev index */ avl_node_t vfs_avlmntpnt; /* by mntpnt index */ /* * global mount count to define an order on entries in * the avl trees with same dev/mountpoint */ uint64_t vfs_mntix; /* vfs_op should not be used directly. Accessor functions are provided */ vfsops_t *vfs_op; /* operations on VFS */ struct vnode *vfs_vnodecovered; /* vnode mounted on */ uint_t vfs_flag; /* flags */ uint_t vfs_bsize; /* native block size */ int vfs_fstype; /* file system type index */ fsid_t vfs_fsid; /* file system id */ void *vfs_data; /* private data */ dev_t vfs_dev; /* device of mounted VFS */ ulong_t vfs_bcount; /* I/O count (accounting) */ struct vfs *vfs_list; /* sync list pointer */ struct vfs *vfs_hash; /* hash list pointer */ ksema_t vfs_reflock; /* mount/unmount/sync lock */ uint_t vfs_count; /* vfs reference count */ mntopts_t vfs_mntopts; /* options mounted with */ refstr_t *vfs_resource; /* mounted resource name */ refstr_t *vfs_mntpt; /* mount point name */ time_t vfs_mtime; /* time we were mounted */ struct vfs_impl *vfs_implp; /* impl specific data */ /* * Zones support. Note that the zone that "owns" the mount isn't * necessarily the same as the zone in which the zone is visible. * That is, vfs_zone and (vfs_zone_next|vfs_zone_prev) may refer to * different zones. */ struct zone *vfs_zone; /* zone that owns the mount */ struct vfs *vfs_zone_next; /* next VFS visible in zone */ struct vfs *vfs_zone_prev; /* prev VFS visible in zone */ struct fem_head *vfs_femhead; /* fs monitoring */ uint32_t vfs_lofi_id; /* ID if lofi mount */ } vfs_t; #define vfs_featureset vfs_implp->vi_featureset #define vfs_vskap vfs_implp->vi_vskap #define vfs_fstypevsp vfs_implp->vi_fstypevsp #define vfs_vopstats vfs_implp->vi_vopstats #define vfs_hrctime vfs_implp->vi_hrctime /* * VFS flags. */ #define VFS_RDONLY 0x01 /* read-only vfs */ #define VFS_NOMNTTAB 0x02 /* vfs not seen in mnttab */ #define VFS_NOSETUID 0x08 /* setuid disallowed */ #define VFS_REMOUNT 0x10 /* modify mount options only */ #define VFS_NOTRUNC 0x20 /* does not truncate long file names */ #define VFS_UNLINKABLE 0x40 /* unlink(2) can be applied to root */ #define VFS_PXFS 0x80 /* clustering: global fs proxy vfs */ #define VFS_UNMOUNTED 0x100 /* file system has been unmounted */ #define VFS_NBMAND 0x200 /* allow non-blocking mandatory locks */ #define VFS_XATTR 0x400 /* fs supports extended attributes */ #define VFS_NODEVICES 0x800 /* device-special files disallowed */ #define VFS_NOEXEC 0x1000 /* executables disallowed */ #define VFS_STATS 0x2000 /* file system can collect stats */ #define VFS_XID 0x4000 /* file system supports extended ids */ #define VFS_NOFOLLOW 0x8000 /* never follow symlinks */ #define VFS_NORESOURCE "unspecified_resource" #define VFS_NOMNTPT "unspecified_mountpoint" /* * VFS features are implemented as bits set in the vfs_t. * The vfs_feature_t typedef is a 64-bit number that will translate * into an element in an array of bitmaps and a bit in that element. * Developers must not depend on the implementation of this and * need to use vfs_has_feature()/vfs_set_feature() routines. */ typedef uint64_t vfs_feature_t; #define VFSFT_XVATTR 0x100000001 /* Supports xvattr for attrs */ #define VFSFT_CASEINSENSITIVE 0x100000002 /* Supports case-insensitive */ #define VFSFT_NOCASESENSITIVE 0x100000004 /* NOT case-sensitive */ #define VFSFT_DIRENTFLAGS 0x100000008 /* Supports dirent flags */ #define VFSFT_ACLONCREATE 0x100000010 /* Supports ACL on create */ #define VFSFT_ACEMASKONACCESS 0x100000020 /* Can use ACEMASK for access */ #define VFSFT_SYSATTR_VIEWS 0x100000040 /* Supports sysattr view i/f */ #define VFSFT_ACCESS_FILTER 0x100000080 /* dirents filtered by access */ #define VFSFT_REPARSE 0x100000100 /* Supports reparse point */ #define VFSFT_ZEROCOPY_SUPPORTED 0x100000200 /* Support loaning /returning cache buffer */ /* * Argument structure for mount(2). * * Flags are defined in . * * Note that if the MS_SYSSPACE bit is set in flags, the pointer fields in * this structure are to be interpreted as kernel addresses. File systems * should be prepared for this possibility. */ struct mounta { char *spec; char *dir; int flags; char *fstype; char *dataptr; int datalen; char *optptr; int optlen; }; /* * Reasons for calling the vfs_mountroot() operation. */ enum whymountroot { ROOT_INIT, ROOT_REMOUNT, ROOT_UNMOUNT}; typedef enum whymountroot whymountroot_t; /* * Reasons for calling the VFS_VNSTATE(): */ enum vntrans { VNTRANS_EXISTS, VNTRANS_IDLED, VNTRANS_RECLAIMED, VNTRANS_DESTROYED }; typedef enum vntrans vntrans_t; /* * VFS_OPS defines all the vfs operations. It is used to define * the vfsops structure (below) and the fs_func_p union (vfs_opreg.h). */ #define VFS_OPS \ int (*vfs_mount)(vfs_t *, vnode_t *, struct mounta *, cred_t *); \ int (*vfs_unmount)(vfs_t *, int, cred_t *); \ int (*vfs_root)(vfs_t *, vnode_t **); \ int (*vfs_statvfs)(vfs_t *, statvfs64_t *); \ int (*vfs_sync)(vfs_t *, short, cred_t *); \ int (*vfs_vget)(vfs_t *, vnode_t **, fid_t *); \ int (*vfs_mountroot)(vfs_t *, enum whymountroot); \ void (*vfs_freevfs)(vfs_t *); \ int (*vfs_vnstate)(vfs_t *, vnode_t *, vntrans_t) /* NB: No ";" */ /* * Operations supported on virtual file system. */ struct vfsops { VFS_OPS; /* Signature of all vfs operations (vfsops) */ }; extern int fsop_mount(vfs_t *, vnode_t *, struct mounta *, cred_t *); extern int fsop_unmount(vfs_t *, int, cred_t *); extern int fsop_root(vfs_t *, vnode_t **); extern int fsop_statfs(vfs_t *, statvfs64_t *); extern int fsop_sync(vfs_t *, short, cred_t *); extern int fsop_vget(vfs_t *, vnode_t **, fid_t *); extern int fsop_mountroot(vfs_t *, enum whymountroot); extern void fsop_freefs(vfs_t *); extern int fsop_sync_by_kind(int, short, cred_t *); extern int fsop_vnstate(vfs_t *, vnode_t *, vntrans_t); #define VFS_MOUNT(vfsp, mvp, uap, cr) fsop_mount(vfsp, mvp, uap, cr) #define VFS_UNMOUNT(vfsp, flag, cr) fsop_unmount(vfsp, flag, cr) #define VFS_ROOT(vfsp, vpp) fsop_root(vfsp, vpp) #define VFS_STATVFS(vfsp, sp) fsop_statfs(vfsp, sp) #define VFS_SYNC(vfsp, flag, cr) fsop_sync(vfsp, flag, cr) #define VFS_VGET(vfsp, vpp, fidp) fsop_vget(vfsp, vpp, fidp) #define VFS_MOUNTROOT(vfsp, init) fsop_mountroot(vfsp, init) #define VFS_FREEVFS(vfsp) fsop_freefs(vfsp) #define VFS_VNSTATE(vfsp, vn, ns) fsop_vnstate(vfsp, vn, ns) #define VFSNAME_MOUNT "mount" #define VFSNAME_UNMOUNT "unmount" #define VFSNAME_ROOT "root" #define VFSNAME_STATVFS "statvfs" #define VFSNAME_SYNC "sync" #define VFSNAME_VGET "vget" #define VFSNAME_MOUNTROOT "mountroot" #define VFSNAME_FREEVFS "freevfs" #define VFSNAME_VNSTATE "vnstate" /* * Filesystem type switch table. */ typedef struct vfssw { char *vsw_name; /* type name -- max len _ST_FSTYPSZ */ int (*vsw_init) (int, char *); /* init routine (for non-loadable fs only) */ int vsw_flag; /* flags */ mntopts_t vsw_optproto; /* mount options table prototype */ uint_t vsw_count; /* count of references */ kmutex_t vsw_lock; /* lock to protect vsw_count */ vfsops_t vsw_vfsops; /* filesystem operations vector */ } vfssw_t; /* * Filesystem type definition record. All file systems must export a record * of this type through their modlfs structure. N.B., changing the version * number requires a change in sys/modctl.h. */ typedef struct vfsdef_v5 { int def_version; /* structure version, must be first */ char *name; /* filesystem type name */ int (*init) (int, char *); /* init routine */ int flags; /* filesystem flags */ mntopts_t *optproto; /* mount options table prototype */ } vfsdef_v5; typedef struct vfsdef_v5 vfsdef_t; enum { VFSDEF_VERSION = 5 }; /* * flags for vfssw and vfsdef */ #define VSW_HASPROTO 0x01 /* struct has a mount options prototype */ #define VSW_CANRWRO 0x02 /* file system can transition from rw to ro */ #define VSW_CANREMOUNT 0x04 /* file system supports remounts */ #define VSW_NOTZONESAFE 0x08 /* zone_enter(2) should fail for these files */ #define VSW_VOLATILEDEV 0x10 /* vfs_dev can change each time fs is mounted */ #define VSW_STATS 0x20 /* file system can collect stats */ #define VSW_XID 0x40 /* file system supports extended ids */ #define VSW_CANLOFI 0x80 /* file system supports lofi mounts */ #define VSW_ZMOUNT 0x100 /* file system always allowed in a zone */ #define VSW_INSTALLED 0x8000 /* this vsw is associated with a file system */ /* * A flag for vfs_setpath(). */ #define VFSSP_VERBATIM 0x1 /* do not prefix the supplied path */ #if defined(_KERNEL) || defined(_FAKE_KERNEL) /* * Private vfs data, NOT to be used by a file system implementation. */ #define VFS_FEATURE_MAXSZ 4 typedef struct vfs_impl { /* Counted array - Bitmap of vfs features */ uint32_t vi_featureset[VFS_FEATURE_MAXSZ]; /* * Support for statistics on the vnode operations */ vsk_anchor_t *vi_vskap; /* anchor for vopstats' kstat */ vopstats_t *vi_fstypevsp; /* ptr to per-fstype vopstats */ vopstats_t vi_vopstats; /* per-mount vnode op stats */ timespec_t vi_hrctime; /* High-res creation time */ zone_ref_t vi_zone_ref; /* reference to zone */ } vfs_impl_t; /* * Public operations. */ struct umounta; struct statvfsa; struct fstatvfsa; void vfs_freevfsops(vfsops_t *); int vfs_freevfsops_by_type(int); void vfs_setops(vfs_t *, vfsops_t *); vfsops_t *vfs_getops(vfs_t *vfsp); int vfs_matchops(vfs_t *, vfsops_t *); int vfs_can_sync(vfs_t *vfsp); vfs_t *vfs_alloc(int); void vfs_free(vfs_t *); void vfs_init(vfs_t *vfsp, vfsops_t *, void *); void vfsimpl_setup(vfs_t *vfsp); void vfsimpl_teardown(vfs_t *vfsp); void vn_exists(vnode_t *); void vn_idle(vnode_t *); void vn_reclaim(vnode_t *); void vn_invalid(vnode_t *); int rootconf(void); int domount(char *, struct mounta *, vnode_t *, struct cred *, struct vfs **); int dounmount(struct vfs *, int, cred_t *); int vfs_lock(struct vfs *); int vfs_rlock(struct vfs *); void vfs_lock_wait(struct vfs *); void vfs_rlock_wait(struct vfs *); void vfs_unlock(struct vfs *); int vfs_lock_held(struct vfs *); struct _kthread *vfs_lock_owner(struct vfs *); void sync(void); void vfs_sync(int); void vfs_mountroot(void); void vfs_add(vnode_t *, struct vfs *, int); void vfs_remove(struct vfs *); /* VFS feature routines */ void vfs_set_feature(vfs_t *, vfs_feature_t); void vfs_clear_feature(vfs_t *, vfs_feature_t); int vfs_has_feature(vfs_t *, vfs_feature_t); void vfs_propagate_features(vfs_t *, vfs_t *); /* The following functions are not for general use by filesystems */ void vfs_createopttbl(mntopts_t *, const char *); void vfs_copyopttbl(const mntopts_t *, mntopts_t *); void vfs_mergeopttbl(const mntopts_t *, const mntopts_t *, mntopts_t *); void vfs_freeopttbl(mntopts_t *); void vfs_parsemntopts(mntopts_t *, char *, int); int vfs_buildoptionstr(const mntopts_t *, char *, int); struct mntopt *vfs_hasopt(const mntopts_t *, const char *); void vfs_mnttab_modtimeupd(void); void vfs_clearmntopt(struct vfs *, const char *); void vfs_setmntopt(struct vfs *, const char *, const char *, int); void vfs_setresource(struct vfs *, const char *, uint32_t); void vfs_setmntpoint(struct vfs *, const char *, uint32_t); refstr_t *vfs_getresource(const struct vfs *); refstr_t *vfs_getmntpoint(const struct vfs *); int vfs_optionisset(const struct vfs *, const char *, char **); int vfs_settag(uint_t, uint_t, const char *, const char *, cred_t *); int vfs_clrtag(uint_t, uint_t, const char *, const char *, cred_t *); void vfs_syncall(void); void vfs_syncprogress(void); void vfsinit(void); void vfs_unmountall(void); void vfs_make_fsid(fsid_t *, dev_t, int); void vfs_addmip(dev_t, struct vfs *); void vfs_delmip(struct vfs *); int vfs_devismounted(dev_t); int vfs_devmounting(dev_t, struct vfs *); int vfs_opsinuse(vfsops_t *); struct vfs *getvfs(fsid_t *); struct vfs *vfs_dev2vfsp(dev_t); struct vfs *vfs_mntpoint2vfsp(const char *); struct vfssw *allocate_vfssw(const char *); struct vfssw *vfs_getvfssw(const char *); struct vfssw *vfs_getvfsswbyname(const char *); struct vfssw *vfs_getvfsswbyvfsops(vfsops_t *); void vfs_refvfssw(struct vfssw *); void vfs_unrefvfssw(struct vfssw *); uint_t vf_to_stf(uint_t); void vfs_mnttab_modtime(timespec_t *); void vfs_mnttab_poll(timespec_t *, struct pollhead **); void vfs_list_lock(void); void vfs_list_read_lock(void); void vfs_list_unlock(void); void vfs_list_add(struct vfs *); void vfs_list_remove(struct vfs *); void vfs_hold(vfs_t *vfsp); void vfs_rele(vfs_t *vfsp); void fs_freevfs(vfs_t *); void vfs_root_redev(vfs_t *vfsp, dev_t ndev, int fstype); int vfs_zone_change_safe(vfs_t *); int vfs_get_lofi(vfs_t *, vnode_t **); #define VFSHASH(maj, min) (((int)((maj)+(min))) & (vfshsz - 1)) #define VFS_ON_LIST(vfsp) \ ((vfsp)->vfs_next != (vfsp) && (vfsp)->vfs_next != NULL) /* * Globals. */ extern struct vfssw vfssw[]; /* table of filesystem types */ extern krwlock_t vfssw_lock; extern char rootfstype[]; /* name of root fstype */ extern const int nfstype; /* # of elements in vfssw array */ extern vfsops_t *EIO_vfsops; /* operations for vfs being torn-down */ /* * The following variables are private to the the kernel's vfs layer. File * system implementations should not access them. */ extern struct vfs *rootvfs; /* ptr to root vfs structure */ typedef struct { struct vfs *rvfs_head; /* head vfs in chain */ kmutex_t rvfs_lock; /* mutex protecting this chain */ uint32_t rvfs_len; /* length of this chain */ } rvfs_t; extern rvfs_t *rvfs_list; extern int vfshsz; /* # of elements in rvfs_head array */ extern const mntopts_t vfs_mntopts; /* globally recognized options */ #endif /* defined(_KERNEL) */ #define VFS_HOLD(vfsp) { \ vfs_hold(vfsp); \ } #define VFS_RELE(vfsp) { \ vfs_rele(vfsp); \ } #define VFS_INIT(vfsp, op, data) { \ vfs_init((vfsp), (op), (data)); \ } #define VFS_INSTALLED(vfsswp) (((vfsswp)->vsw_flag & VSW_INSTALLED) != 0) #define ALLOCATED_VFSSW(vswp) ((vswp)->vsw_name[0] != '\0') #define RLOCK_VFSSW() (rw_enter(&vfssw_lock, RW_READER)) #define RUNLOCK_VFSSW() (rw_exit(&vfssw_lock)) #define WLOCK_VFSSW() (rw_enter(&vfssw_lock, RW_WRITER)) #define WUNLOCK_VFSSW() (rw_exit(&vfssw_lock)) #define VFSSW_LOCKED() (RW_LOCK_HELD(&vfssw_lock)) #define VFSSW_WRITE_LOCKED() (RW_WRITE_HELD(&vfssw_lock)) /* * VFS_SYNC flags. */ #define SYNC_ATTR 0x01 /* sync attributes only */ #define SYNC_CLOSE 0x02 /* close open file */ #define SYNC_ALL 0x04 /* force to sync all fs */ #ifdef __cplusplus } #endif #endif /* _SYS_VFS_H */