/* * 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 Joyent, Inc. * Copyright 2016 Toomas Soome * Copyright (c) 2016 by Delphix. All rights reserved. * Copyright 2017 RackTop Systems. * Copyright 2018 Nexenta Systems, Inc. */ /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ /* All Rights Reserved */ /* * University Copyright- Copyright (c) 1982, 1986, 1988 * The Regents of the University of California * All Rights Reserved * * University Acknowledgment- Portions of this document are derived from * software developed by the University of California, Berkeley, and its * contributors. */ /* * This file contains those functions from fs/vfs.c that can be * used with relatively little change. Functions that differ * significantly from that are in other files. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static void vfs_clearmntopt_nolock(mntopts_t *, const char *, int); static void vfs_setmntopt_nolock(mntopts_t *, const char *, const char *, int, int); static int vfs_optionisset_nolock(const mntopts_t *, const char *, char **); // static void vfs_freemnttab(struct vfs *); static void vfs_freeopt(mntopt_t *); static void vfs_swapopttbl_nolock(mntopts_t *, mntopts_t *); static void vfs_swapopttbl(mntopts_t *, mntopts_t *); static void vfs_copyopttbl_extend(const mntopts_t *, mntopts_t *, int); // static void vfs_createopttbl_extend(mntopts_t *, const char *, // const mntopts_t *); // static char **vfs_copycancelopt_extend(char **const, int); static void vfs_freecancelopt(char **); /* * VFS global data. */ vnode_t *rootdir; /* pointer to root inode vnode. */ struct vfs *rootvfs = NULL; /* pointer to root vfs; head of VFS list. */ static krwlock_t vfslist; struct vfs *zone_vfslist; /* list of FS's mounted in zone */ /* from os/vfs_conf.c */ const int nfstype = 5; struct vfssw vfssw[10] = { { "BADVFS" }, /* 0:invalid */ { "" }, /* reserved for loadable fs */ { "" }, { "" }, { "" }, }; /* * Table for generic options recognized in the VFS layer and acted * on at this level before parsing file system specific options. * The nosuid option is stronger than any of the devices and setuid * options, so those are canceled when nosuid is seen. * * All options which are added here need to be added to the * list of standard options in usr/src/cmd/fs.d/fslib.c as well. */ /* * VFS Mount options table */ static char *ro_cancel[] = { MNTOPT_RW, NULL }; static char *rw_cancel[] = { MNTOPT_RO, NULL }; static char *suid_cancel[] = { MNTOPT_NOSUID, NULL }; static char *nosuid_cancel[] = { MNTOPT_SUID, MNTOPT_DEVICES, MNTOPT_NODEVICES, MNTOPT_NOSETUID, MNTOPT_SETUID, NULL }; static char *devices_cancel[] = { MNTOPT_NODEVICES, NULL }; static char *nodevices_cancel[] = { MNTOPT_DEVICES, NULL }; static char *setuid_cancel[] = { MNTOPT_NOSETUID, NULL }; static char *nosetuid_cancel[] = { MNTOPT_SETUID, NULL }; static char *nbmand_cancel[] = { MNTOPT_NONBMAND, NULL }; static char *nonbmand_cancel[] = { MNTOPT_NBMAND, NULL }; static char *exec_cancel[] = { MNTOPT_NOEXEC, NULL }; static char *noexec_cancel[] = { MNTOPT_EXEC, NULL }; static const mntopt_t mntopts[] = { /* * option name cancel options default arg flags */ { MNTOPT_REMOUNT, NULL, NULL, MO_NODISPLAY, (void *)0 }, { MNTOPT_RO, ro_cancel, NULL, 0, (void *)0 }, { MNTOPT_RW, rw_cancel, NULL, 0, (void *)0 }, { MNTOPT_SUID, suid_cancel, NULL, 0, (void *)0 }, { MNTOPT_NOSUID, nosuid_cancel, NULL, 0, (void *)0 }, { MNTOPT_DEVICES, devices_cancel, NULL, 0, (void *)0 }, { MNTOPT_NODEVICES, nodevices_cancel, NULL, 0, (void *)0 }, { MNTOPT_SETUID, setuid_cancel, NULL, 0, (void *)0 }, { MNTOPT_NOSETUID, nosetuid_cancel, NULL, 0, (void *)0 }, { MNTOPT_NBMAND, nbmand_cancel, NULL, 0, (void *)0 }, { MNTOPT_NONBMAND, nonbmand_cancel, NULL, 0, (void *)0 }, { MNTOPT_EXEC, exec_cancel, NULL, 0, (void *)0 }, { MNTOPT_NOEXEC, noexec_cancel, NULL, 0, (void *)0 }, }; const mntopts_t vfs_mntopts = { sizeof (mntopts) / sizeof (mntopt_t), (mntopt_t *)&mntopts[0] }; /* * File system operation dispatch functions. */ int fsop_mount(vfs_t *vfsp, vnode_t *mvp, struct mounta *uap, cred_t *cr) { return (*(vfsp)->vfs_op->vfs_mount)(vfsp, mvp, uap, cr); } int fsop_unmount(vfs_t *vfsp, int flag, cred_t *cr) { return (*(vfsp)->vfs_op->vfs_unmount)(vfsp, flag, cr); } int fsop_root(vfs_t *vfsp, vnode_t **vpp) { return ((*(vfsp)->vfs_op->vfs_root)(vfsp, vpp)); } int fsop_statfs(vfs_t *vfsp, statvfs64_t *sp) { return (*(vfsp)->vfs_op->vfs_statvfs)(vfsp, sp); } int fsop_sync(vfs_t *vfsp, short flag, cred_t *cr) { return (*(vfsp)->vfs_op->vfs_sync)(vfsp, flag, cr); } int fsop_vget(vfs_t *vfsp, vnode_t **vpp, fid_t *fidp) { return (*(vfsp)->vfs_op->vfs_vget)(vfsp, vpp, fidp); } int fsop_mountroot(vfs_t *vfsp, enum whymountroot reason) { return (*(vfsp)->vfs_op->vfs_mountroot)(vfsp, reason); } void fsop_freefs(vfs_t *vfsp) { (*(vfsp)->vfs_op->vfs_freevfs)(vfsp); } int fsop_vnstate(vfs_t *vfsp, vnode_t *vp, vntrans_t nstate) { return ((*(vfsp)->vfs_op->vfs_vnstate)(vfsp, vp, nstate)); } int fsop_sync_by_kind(int fstype, short flag, cred_t *cr) { ASSERT((fstype >= 0) && (fstype < nfstype)); if (ALLOCATED_VFSSW(&vfssw[fstype]) && VFS_INSTALLED(&vfssw[fstype])) return (*vfssw[fstype].vsw_vfsops.vfs_sync) (NULL, flag, cr); else return (ENOTSUP); } /* * File system initialization. vfs_setfsops() must be called from a file * system's init routine. */ static int fs_copyfsops(const fs_operation_def_t *template, vfsops_t *actual, int *unused_ops) { static const fs_operation_trans_def_t vfs_ops_table[] = { VFSNAME_MOUNT, offsetof(vfsops_t, vfs_mount), fs_nosys, fs_nosys, VFSNAME_UNMOUNT, offsetof(vfsops_t, vfs_unmount), fs_nosys, fs_nosys, VFSNAME_ROOT, offsetof(vfsops_t, vfs_root), fs_nosys, fs_nosys, VFSNAME_STATVFS, offsetof(vfsops_t, vfs_statvfs), fs_nosys, fs_nosys, VFSNAME_SYNC, offsetof(vfsops_t, vfs_sync), (fs_generic_func_p) fs_sync, (fs_generic_func_p) fs_sync, /* No errors allowed */ VFSNAME_VGET, offsetof(vfsops_t, vfs_vget), fs_nosys, fs_nosys, VFSNAME_MOUNTROOT, offsetof(vfsops_t, vfs_mountroot), fs_nosys, fs_nosys, VFSNAME_FREEVFS, offsetof(vfsops_t, vfs_freevfs), (fs_generic_func_p)(uintptr_t)fs_freevfs, (fs_generic_func_p)(uintptr_t) fs_freevfs, /* Shouldn't fail */ VFSNAME_VNSTATE, offsetof(vfsops_t, vfs_vnstate), (fs_generic_func_p)fs_nosys, (fs_generic_func_p)fs_nosys, NULL, 0, NULL, NULL }; return (fs_build_vector(actual, unused_ops, vfs_ops_table, template)); } /* zfs_boot_init() */ int vfs_setfsops(int fstype, const fs_operation_def_t *template, vfsops_t **actual) { int error; int unused_ops; /* * Verify that fstype refers to a valid fs. Note that * 0 is valid since it's used to set "stray" ops. */ if ((fstype < 0) || (fstype >= nfstype)) return (EINVAL); if (!ALLOCATED_VFSSW(&vfssw[fstype])) return (EINVAL); /* Set up the operations vector. */ error = fs_copyfsops(template, &vfssw[fstype].vsw_vfsops, &unused_ops); if (error != 0) return (error); vfssw[fstype].vsw_flag |= VSW_INSTALLED; if (actual != NULL) *actual = &vfssw[fstype].vsw_vfsops; #if DEBUG if (unused_ops != 0) cmn_err(CE_WARN, "vfs_setfsops: %s: %d operations supplied " "but not used", vfssw[fstype].vsw_name, unused_ops); #endif return (0); } int vfs_makefsops(const fs_operation_def_t *template, vfsops_t **actual) { int error; int unused_ops; *actual = (vfsops_t *)kmem_alloc(sizeof (vfsops_t), KM_SLEEP); error = fs_copyfsops(template, *actual, &unused_ops); if (error != 0) { kmem_free(*actual, sizeof (vfsops_t)); *actual = NULL; return (error); } return (0); } /* * Free a vfsops structure created as a result of vfs_makefsops(). * NOTE: For a vfsops structure initialized by vfs_setfsops(), use * vfs_freevfsops_by_type(). */ void vfs_freevfsops(vfsops_t *vfsops) { kmem_free(vfsops, sizeof (vfsops_t)); } /* * Since the vfsops structure is part of the vfssw table and wasn't * really allocated, we're not really freeing anything. We keep * the name for consistency with vfs_freevfsops(). We do, however, * need to take care of a little bookkeeping. * NOTE: For a vfsops structure created by vfs_setfsops(), use * vfs_freevfsops_by_type(). */ int vfs_freevfsops_by_type(int fstype) { /* Verify that fstype refers to a loaded fs (and not fsid 0). */ if ((fstype <= 0) || (fstype >= nfstype)) return (EINVAL); WLOCK_VFSSW(); if ((vfssw[fstype].vsw_flag & VSW_INSTALLED) == 0) { WUNLOCK_VFSSW(); return (EINVAL); } vfssw[fstype].vsw_flag &= ~VSW_INSTALLED; WUNLOCK_VFSSW(); return (0); } /* Support routines used to reference vfs_op */ /* Set the operations vector for a vfs */ void vfs_setops(vfs_t *vfsp, vfsops_t *vfsops) { ASSERT(vfsp != NULL); ASSERT(vfsops != NULL); vfsp->vfs_op = vfsops; } /* Retrieve the operations vector for a vfs */ vfsops_t * vfs_getops(vfs_t *vfsp) { ASSERT(vfsp != NULL); return (vfsp->vfs_op); } /* * Returns non-zero (1) if the vfsops matches that of the vfs. * Returns zero (0) if not. */ int vfs_matchops(vfs_t *vfsp, vfsops_t *vfsops) { return (vfs_getops(vfsp) == vfsops); } /* * Returns non-zero (1) if the file system has installed a non-default, * non-error vfs_sync routine. Returns zero (0) otherwise. */ int vfs_can_sync(vfs_t *vfsp) { /* vfs_sync() routine is not the default/error function */ return (vfs_getops(vfsp)->vfs_sync != fs_sync); } /* * Initialize a vfs structure. */ void vfs_init(vfs_t *vfsp, vfsops_t *op, void *data) { /* Always do full init, like vfs_alloc() */ bzero(vfsp, sizeof (vfs_t)); vfsp->vfs_count = 0; vfsp->vfs_next = vfsp; vfsp->vfs_prev = vfsp; vfsp->vfs_zone_next = vfsp; vfsp->vfs_zone_prev = vfsp; vfsp->vfs_lofi_id = 0; sema_init(&vfsp->vfs_reflock, 1, NULL, SEMA_DEFAULT, NULL); vfsimpl_setup(vfsp); vfsp->vfs_data = (data); vfs_setops((vfsp), (op)); } /* * Allocate and initialize the vfs implementation private data * structure, vfs_impl_t. */ void vfsimpl_setup(vfs_t *vfsp) { int i; if (vfsp->vfs_implp != NULL) { return; } vfsp->vfs_implp = kmem_alloc(sizeof (vfs_impl_t), KM_SLEEP); /* Note that these are #define'd in vfs.h */ vfsp->vfs_vskap = NULL; vfsp->vfs_fstypevsp = NULL; /* Set size of counted array, then zero the array */ vfsp->vfs_featureset[0] = VFS_FEATURE_MAXSZ - 1; for (i = 1; i < VFS_FEATURE_MAXSZ; i++) { vfsp->vfs_featureset[i] = 0; } } /* * Release the vfs_impl_t structure, if it exists. Some unbundled * filesystems may not use the newer version of vfs and thus * would not contain this implementation private data structure. */ void vfsimpl_teardown(vfs_t *vfsp) { vfs_impl_t *vip = vfsp->vfs_implp; if (vip == NULL) return; kmem_free(vfsp->vfs_implp, sizeof (vfs_impl_t)); vfsp->vfs_implp = NULL; } /* * VFS system calls: mount, umount, syssync, statfs, fstatfs, statvfs, * fstatvfs, and sysfs moved to common/syscall. */ // vfs_sync, sync /* * External routines. */ krwlock_t vfssw_lock; /* lock accesses to vfssw */ /* * Lock for accessing the vfs linked list. Initialized in vfs_mountroot(), * but otherwise should be accessed only via vfs_list_lock() and * vfs_list_unlock(). Also used to protect the timestamp for mods to the list. */ static krwlock_t vfslist; // vfs_mountdevices(void) // vfs_mountdev1(void) // vfs_mountfs() // vfs_mountroot() // lofi_add, lofi_remove /* * Mount the FS for the test jig. Based on domount() */ int fake_domount(char *fsname, struct mounta *uap, struct vfs **vfspp) { vnode_t *vp; struct cred *credp; struct vfssw *vswp; vfsops_t *vfsops; struct vfs *vfsp = NULL; mntopts_t mnt_mntopts; int error = 0; int copyout_error = 0; char *opts = uap->optptr; char *inargs = opts; int optlen = uap->optlen; credp = CRED(); /* * Test jig specific: mount on rootdir */ if (rootvfs != NULL) return (EBUSY); vp = rootdir; /* * The v_flag value for the mount point vp is permanently set * to VVFSLOCK so that no one bypasses the vn_vfs*locks routine * for mount point locking. */ mutex_enter(&vp->v_lock); vp->v_flag |= VVFSLOCK; mutex_exit(&vp->v_lock); mnt_mntopts.mo_count = 0; /* * Find the ops vector to use to invoke the file system-specific mount * method. If the fsname argument is non-NULL, use it directly. */ if ((vswp = vfs_getvfssw(fsname)) == NULL) { return (EINVAL); } if (!VFS_INSTALLED(vswp)) return (EINVAL); // secpolicy_fs_allowed_mount(fsname) vfsops = &vswp->vsw_vfsops; vfs_copyopttbl(&vswp->vsw_optproto, &mnt_mntopts); /* * Fetch mount options and parse them for generic vfs options */ if (uap->flags & MS_OPTIONSTR) { /* * Limit the buffer size */ if (optlen < 0 || optlen > MAX_MNTOPT_STR) { error = EINVAL; goto errout; } if ((uap->flags & MS_SYSSPACE) == 0) { inargs = kmem_alloc(MAX_MNTOPT_STR, KM_SLEEP); inargs[0] = '\0'; if (optlen) { error = copyinstr(opts, inargs, (size_t)optlen, NULL); if (error) { goto errout; } } } vfs_parsemntopts(&mnt_mntopts, inargs, 0); } /* * Flag bits override the options string. */ if (uap->flags & MS_REMOUNT) vfs_setmntopt_nolock(&mnt_mntopts, MNTOPT_REMOUNT, NULL, 0, 0); if (uap->flags & MS_RDONLY) vfs_setmntopt_nolock(&mnt_mntopts, MNTOPT_RO, NULL, 0, 0); if (uap->flags & MS_NOSUID) vfs_setmntopt_nolock(&mnt_mntopts, MNTOPT_NOSUID, NULL, 0, 0); /* * Check if this is a remount; must be set in the option string and * the file system must support a remount option. */ if (vfs_optionisset_nolock(&mnt_mntopts, MNTOPT_REMOUNT, NULL)) { /* disallow here */ error = ENOTSUP; goto errout; } /* * uap->flags and vfs_optionisset() should agree. */ if (vfs_optionisset_nolock(&mnt_mntopts, MNTOPT_RO, NULL)) { uap->flags |= MS_RDONLY; } if (vfs_optionisset_nolock(&mnt_mntopts, MNTOPT_NOSUID, NULL)) { uap->flags |= MS_NOSUID; } // nbmand ... /* * If we are splicing the fs into the namespace, * perform mount point checks... * (always splice=0 here) */ if ((uap->flags & (MS_DATA | MS_OPTIONSTR)) == 0) { uap->dataptr = NULL; uap->datalen = 0; } /* * If this is a remount, ... (never here) */ vfsp = vfs_alloc(KM_SLEEP); VFS_INIT(vfsp, vfsops, NULL); VFS_HOLD(vfsp); // lofi_add(fsname, vfsp, &mnt_mntopts, uap) /* * PRIV_SYS_MOUNT doesn't mean you can become root. */ uap->flags |= MS_NOSUID; vfs_setmntopt_nolock(&mnt_mntopts, MNTOPT_NOSUID, NULL, 0, 0); /* * The vfs_reflock... */ /* * Lock the vfs... */ if ((error = vfs_lock(vfsp)) != 0) { vfs_free(vfsp); vfsp = NULL; goto errout; } /* * Add device to mount in progress table... */ /* * Invalidate cached entry for the mount point. */ /* * If have an option string but the filesystem doesn't supply a * prototype options table, create a table... */ /* * Serialize with zone state transitions... */ // mount_in_progress(zone); /* * Instantiate (or reinstantiate) the file system... */ vfs_swapopttbl(&mnt_mntopts, &vfsp->vfs_mntopts); vfs_setresource(vfsp, uap->spec, 0); vfs_setmntpoint(vfsp, uap->dir, 0); /* * going to mount on this vnode, so notify. */ // vnevent_mountedover(vp, NULL); error = VFS_MOUNT(vfsp, vp, uap, credp); if (uap->flags & MS_RDONLY) vfs_setmntopt(vfsp, MNTOPT_RO, NULL, 0); if (uap->flags & MS_NOSUID) vfs_setmntopt(vfsp, MNTOPT_NOSUID, NULL, 0); if (uap->flags & MS_GLOBAL) vfs_setmntopt(vfsp, MNTOPT_GLOBAL, NULL, 0); if (error) { // lofi_remove(vfsp); // (remount == 0) vfs_unlock(vfsp); // vfs_freemnttab(vfsp); vfs_free(vfsp); vfsp = NULL; } else { /* * Set the mount time to now */ // vfsp->vfs_mtime = ddi_get_time(); // if (remount) ... // else if (splice) vfs_add(vp, vfsp, flags) // else VFS_HOLD(vfsp); /* * Test jig specific: * Do sort of like vfs_add for vp=rootdir * Already have hold on vp. */ vfsp->vfs_vnodecovered = vp; vfsp->vfs_flag |= (VFS_NOSETUID|VFS_NODEVICES); VFS_HOLD(vfsp); rootvfs = vfsp; /* * Set flags for global options encountered */ if (vfs_optionisset(vfsp, MNTOPT_RO, NULL)) vfsp->vfs_flag |= VFS_RDONLY; else vfsp->vfs_flag &= ~VFS_RDONLY; if (vfs_optionisset(vfsp, MNTOPT_NOSUID, NULL)) { vfsp->vfs_flag |= (VFS_NOSETUID|VFS_NODEVICES); } else { if (vfs_optionisset(vfsp, MNTOPT_NODEVICES, NULL)) vfsp->vfs_flag |= VFS_NODEVICES; else vfsp->vfs_flag &= ~VFS_NODEVICES; if (vfs_optionisset(vfsp, MNTOPT_NOSETUID, NULL)) vfsp->vfs_flag |= VFS_NOSETUID; else vfsp->vfs_flag &= ~VFS_NOSETUID; } if (vfs_optionisset(vfsp, MNTOPT_NBMAND, NULL)) vfsp->vfs_flag |= VFS_NBMAND; else vfsp->vfs_flag &= ~VFS_NBMAND; if (vfs_optionisset(vfsp, MNTOPT_XATTR, NULL)) vfsp->vfs_flag |= VFS_XATTR; else vfsp->vfs_flag &= ~VFS_XATTR; if (vfs_optionisset(vfsp, MNTOPT_NOEXEC, NULL)) vfsp->vfs_flag |= VFS_NOEXEC; else vfsp->vfs_flag &= ~VFS_NOEXEC; /* * Now construct the output option string of options * we recognized. */ if (uap->flags & MS_OPTIONSTR) { vfs_list_read_lock(); copyout_error = vfs_buildoptionstr( &vfsp->vfs_mntopts, inargs, optlen); vfs_list_unlock(); if (copyout_error == 0 && (uap->flags & MS_SYSSPACE) == 0) { copyout_error = copyout(inargs, opts, optlen); } } /* * If this isn't a remount, set up the vopstats... */ if (vswp->vsw_flag & VSW_XID) vfsp->vfs_flag |= VFS_XID; vfs_unlock(vfsp); /* * Test jig specicific: * Replace rootdir with the mounted root. */ error = VFS_ROOT(vfsp, &rootdir); if (error != 0) { panic("fake_domount, get root %d\n", error); } } // mount_completed(zone); // zone_rele(zone); // if (splice) // vn_vfsunlock(vp); if ((error == 0) && (copyout_error == 0)) { /* get_vskstat_anchor() */ /* Return vfsp to caller. */ *vfspp = vfsp; } errout: vfs_freeopttbl(&mnt_mntopts); /* resource, mountpt not allocated */ /* no addmip, delmip */ ASSERT(vswp != NULL); vfs_unrefvfssw(vswp); if (inargs != opts) kmem_free(inargs, MAX_MNTOPT_STR); if (copyout_error) { if (vfsp != NULL) { // lofi_remove(vfsp); VFS_RELE(vfsp); } error = copyout_error; } return (error); } static void vfs_setpath( struct vfs *vfsp, /* vfs being updated */ refstr_t **refp, /* Ref-count string to contain the new path */ const char *newpath, /* Path to add to refp (above) */ uint32_t flag) /* flag */ { // size_t len; refstr_t *ref; // char *sp; int have_list_lock = 0; ASSERT(!VFS_ON_LIST(vfsp) || vfs_lock_held(vfsp)); /* * New path must be less than MAXPATHLEN because mntfs * will only display up to MAXPATHLEN bytes. This is currently * safe, because domount() uses pn_get(), and other callers * similarly cap the size to fewer than MAXPATHLEN bytes. */ ASSERT(strlen(newpath) < MAXPATHLEN); /* mntfs requires consistency while vfs list lock is held */ if (VFS_ON_LIST(vfsp)) { have_list_lock = 1; vfs_list_lock(); } if (*refp != NULL) refstr_rele(*refp); /* * If we are in a non-global zone... (do something else) */ ref = refstr_alloc(newpath); *refp = ref; if (have_list_lock) { vfs_mnttab_modtimeupd(); vfs_list_unlock(); } } /* * Record a mounted resource name in a vfs structure. * If vfsp is already mounted, caller must hold the vfs lock. */ void vfs_setresource(struct vfs *vfsp, const char *resource, uint32_t flag) { if (resource == NULL || resource[0] == '\0') resource = VFS_NORESOURCE; vfs_setpath(vfsp, &vfsp->vfs_resource, resource, flag); } /* * Record a mount point name in a vfs structure. * If vfsp is already mounted, caller must hold the vfs lock. */ void vfs_setmntpoint(struct vfs *vfsp, const char *mntpt, uint32_t flag) { if (mntpt == NULL || mntpt[0] == '\0') mntpt = VFS_NOMNTPT; vfs_setpath(vfsp, &vfsp->vfs_mntpt, mntpt, flag); } /* Returns the vfs_resource. Caller must call refstr_rele() when finished. */ refstr_t * vfs_getresource(const struct vfs *vfsp) { refstr_t *resource; vfs_list_read_lock(); resource = vfsp->vfs_resource; refstr_hold(resource); vfs_list_unlock(); return (resource); } /* Returns the vfs_mntpt. Caller must call refstr_rele() when finished. */ refstr_t * vfs_getmntpoint(const struct vfs *vfsp) { refstr_t *mntpt; vfs_list_read_lock(); mntpt = vfsp->vfs_mntpt; refstr_hold(mntpt); vfs_list_unlock(); return (mntpt); } // vfs_createopttbl_extend // vfs_createopttbl /* * Swap two mount options tables */ static void vfs_swapopttbl_nolock(mntopts_t *optbl1, mntopts_t *optbl2) { uint_t tmpcnt; mntopt_t *tmplist; tmpcnt = optbl2->mo_count; tmplist = optbl2->mo_list; optbl2->mo_count = optbl1->mo_count; optbl2->mo_list = optbl1->mo_list; optbl1->mo_count = tmpcnt; optbl1->mo_list = tmplist; } static void vfs_swapopttbl(mntopts_t *optbl1, mntopts_t *optbl2) { vfs_list_lock(); vfs_swapopttbl_nolock(optbl1, optbl2); vfs_mnttab_modtimeupd(); vfs_list_unlock(); } static char ** vfs_copycancelopt_extend(char **const moc, int extend) { int i = 0; int j; char **result; if (moc != NULL) { for (; moc[i] != NULL; i++) /* count number of options to cancel */; } if (i + extend == 0) return (NULL); result = kmem_alloc((i + extend + 1) * sizeof (char *), KM_SLEEP); for (j = 0; j < i; j++) { result[j] = kmem_alloc(strlen(moc[j]) + 1, KM_SLEEP); (void) strcpy(result[j], moc[j]); } for (; j <= i + extend; j++) result[j] = NULL; return (result); } static void vfs_copyopt(const mntopt_t *s, mntopt_t *d) { char *sp, *dp; d->mo_flags = s->mo_flags; d->mo_data = s->mo_data; sp = s->mo_name; if (sp != NULL) { dp = kmem_alloc(strlen(sp) + 1, KM_SLEEP); (void) strcpy(dp, sp); d->mo_name = dp; } else { d->mo_name = NULL; /* should never happen */ } d->mo_cancel = vfs_copycancelopt_extend(s->mo_cancel, 0); sp = s->mo_arg; if (sp != NULL) { dp = kmem_alloc(strlen(sp) + 1, KM_SLEEP); (void) strcpy(dp, sp); d->mo_arg = dp; } else { d->mo_arg = NULL; } } // vfs_copyopttbl_extend // vfs_copyopttbl /* * Copy a mount options table, possibly allocating some spare * slots at the end. It is permissible to copy_extend the NULL table. */ static void vfs_copyopttbl_extend(const mntopts_t *smo, mntopts_t *dmo, int extra) { uint_t i, count; mntopt_t *motbl; /* * Clear out any existing stuff in the options table being initialized */ vfs_freeopttbl(dmo); count = (smo == NULL) ? 0 : smo->mo_count; if ((count + extra) == 0) /* nothing to do */ return; dmo->mo_count = count + extra; motbl = kmem_zalloc((count + extra) * sizeof (mntopt_t), KM_SLEEP); dmo->mo_list = motbl; for (i = 0; i < count; i++) { vfs_copyopt(&smo->mo_list[i], &motbl[i]); } for (i = count; i < count + extra; i++) { motbl[i].mo_flags = MO_EMPTY; } } /* * Copy a mount options table. * * This function is *not* for general use by filesystems. * * Note: caller is responsible for locking the vfs list, if needed, * to protect smo and dmo. */ void vfs_copyopttbl(const mntopts_t *smo, mntopts_t *dmo) { vfs_copyopttbl_extend(smo, dmo, 0); } static char ** vfs_mergecancelopts(const mntopt_t *mop1, const mntopt_t *mop2) { int c1 = 0; int c2 = 0; char **result; char **sp1, **sp2, **dp; /* * First we count both lists of cancel options. * If either is NULL or has no elements, we return a copy of * the other. */ if (mop1->mo_cancel != NULL) { for (; mop1->mo_cancel[c1] != NULL; c1++) /* count cancel options in mop1 */; } if (c1 == 0) return (vfs_copycancelopt_extend(mop2->mo_cancel, 0)); if (mop2->mo_cancel != NULL) { for (; mop2->mo_cancel[c2] != NULL; c2++) /* count cancel options in mop2 */; } result = vfs_copycancelopt_extend(mop1->mo_cancel, c2); if (c2 == 0) return (result); /* * When we get here, we've got two sets of cancel options; * we need to merge the two sets. We know that the result * array has "c1+c2+1" entries and in the end we might shrink * it. * Result now has a copy of the c1 entries from mop1; we'll * now lookup all the entries of mop2 in mop1 and copy it if * it is unique. * This operation is O(n^2) but it's only called once per * filesystem per duplicate option. This is a situation * which doesn't arise with the filesystems in ON and * n is generally 1. */ dp = &result[c1]; for (sp2 = mop2->mo_cancel; *sp2 != NULL; sp2++) { for (sp1 = mop1->mo_cancel; *sp1 != NULL; sp1++) { if (strcmp(*sp1, *sp2) == 0) break; } if (*sp1 == NULL) { /* * Option *sp2 not found in mop1, so copy it. * The calls to vfs_copycancelopt_extend() * guarantee that there's enough room. */ *dp = kmem_alloc(strlen(*sp2) + 1, KM_SLEEP); (void) strcpy(*dp++, *sp2); } } if (dp != &result[c1+c2]) { size_t bytes = (dp - result + 1) * sizeof (char *); char **nres = kmem_alloc(bytes, KM_SLEEP); bcopy(result, nres, bytes); kmem_free(result, (c1 + c2 + 1) * sizeof (char *)); result = nres; } return (result); } /* * Merge two mount option tables (outer and inner) into one. This is very * similar to "merging" global variables and automatic variables in C. * * This isn't (and doesn't have to be) fast. * * This function is *not* for general use by filesystems. * * Note: caller is responsible for locking the vfs list, if needed, * to protect omo, imo & dmo. */ void vfs_mergeopttbl(const mntopts_t *omo, const mntopts_t *imo, mntopts_t *dmo) { uint_t i, count; mntopt_t *mop, *motbl; uint_t freeidx; /* * First determine how much space we need to allocate. */ count = omo->mo_count; for (i = 0; i < imo->mo_count; i++) { if (imo->mo_list[i].mo_flags & MO_EMPTY) continue; if (vfs_hasopt(omo, imo->mo_list[i].mo_name) == NULL) count++; } ASSERT(count >= omo->mo_count && count <= omo->mo_count + imo->mo_count); motbl = kmem_alloc(count * sizeof (mntopt_t), KM_SLEEP); for (i = 0; i < omo->mo_count; i++) vfs_copyopt(&omo->mo_list[i], &motbl[i]); freeidx = omo->mo_count; for (i = 0; i < imo->mo_count; i++) { if (imo->mo_list[i].mo_flags & MO_EMPTY) continue; if ((mop = vfs_hasopt(omo, imo->mo_list[i].mo_name)) != NULL) { char **newcanp; uint_t index = mop - omo->mo_list; newcanp = vfs_mergecancelopts(mop, &motbl[index]); vfs_freeopt(&motbl[index]); vfs_copyopt(&imo->mo_list[i], &motbl[index]); vfs_freecancelopt(motbl[index].mo_cancel); motbl[index].mo_cancel = newcanp; } else { /* * If it's a new option, just copy it over to the first * free location. */ vfs_copyopt(&imo->mo_list[i], &motbl[freeidx++]); } } dmo->mo_count = count; dmo->mo_list = motbl; } /* * Functions to set and clear mount options in a mount options table. */ /* * Clear a mount option, if it exists. * * The update_mnttab arg indicates whether mops is part of a vfs that is on * the vfs list. */ static void vfs_clearmntopt_nolock(mntopts_t *mops, const char *opt, int update_mnttab) { struct mntopt *mop; uint_t i, count; ASSERT(!update_mnttab || RW_WRITE_HELD(&vfslist)); count = mops->mo_count; for (i = 0; i < count; i++) { mop = &mops->mo_list[i]; if (mop->mo_flags & MO_EMPTY) continue; if (strcmp(opt, mop->mo_name)) continue; mop->mo_flags &= ~MO_SET; if (mop->mo_arg != NULL) { kmem_free(mop->mo_arg, strlen(mop->mo_arg) + 1); } mop->mo_arg = NULL; if (update_mnttab) vfs_mnttab_modtimeupd(); break; } } void vfs_clearmntopt(struct vfs *vfsp, const char *opt) { int gotlock = 0; if (VFS_ON_LIST(vfsp)) { gotlock = 1; vfs_list_lock(); } vfs_clearmntopt_nolock(&vfsp->vfs_mntopts, opt, gotlock); if (gotlock) vfs_list_unlock(); } /* * Set a mount option on... */ static void vfs_setmntopt_nolock(mntopts_t *mops, const char *opt, const char *arg, int flags, int update_mnttab) { mntopt_t *mop; uint_t i, count; char *sp; ASSERT(!update_mnttab || RW_WRITE_HELD(&vfslist)); if (flags & VFS_CREATEOPT) { if (vfs_hasopt(mops, opt) != NULL) { flags &= ~VFS_CREATEOPT; } } count = mops->mo_count; for (i = 0; i < count; i++) { mop = &mops->mo_list[i]; if (mop->mo_flags & MO_EMPTY) { if ((flags & VFS_CREATEOPT) == 0) continue; sp = kmem_alloc(strlen(opt) + 1, KM_SLEEP); (void) strcpy(sp, opt); mop->mo_name = sp; if (arg != NULL) mop->mo_flags = MO_HASVALUE; else mop->mo_flags = 0; } else if (strcmp(opt, mop->mo_name)) { continue; } if ((mop->mo_flags & MO_IGNORE) && (flags & VFS_NOFORCEOPT)) break; if (arg != NULL && (mop->mo_flags & MO_HASVALUE) != 0) { sp = kmem_alloc(strlen(arg) + 1, KM_SLEEP); (void) strcpy(sp, arg); } else { sp = NULL; } if (mop->mo_arg != NULL) kmem_free(mop->mo_arg, strlen(mop->mo_arg) + 1); mop->mo_arg = sp; if (flags & VFS_DISPLAY) mop->mo_flags &= ~MO_NODISPLAY; if (flags & VFS_NODISPLAY) mop->mo_flags |= MO_NODISPLAY; mop->mo_flags |= MO_SET; if (mop->mo_cancel != NULL) { char **cp; for (cp = mop->mo_cancel; *cp != NULL; cp++) vfs_clearmntopt_nolock(mops, *cp, 0); } if (update_mnttab) vfs_mnttab_modtimeupd(); break; } } void vfs_setmntopt(struct vfs *vfsp, const char *opt, const char *arg, int flags) { int gotlock = 0; if (VFS_ON_LIST(vfsp)) { gotlock = 1; vfs_list_lock(); } vfs_setmntopt_nolock(&vfsp->vfs_mntopts, opt, arg, flags, gotlock); if (gotlock) vfs_list_unlock(); } // vfs_addtag // vfs_settag // vfs_clrtag /* * Function to parse an option string and fill in a mount options table. * Unknown options are silently ignored. The input option string is modified * by replacing separators with nulls. If the create flag is set, options * not found in the table are just added on the fly. The table must have * an option slot marked MO_EMPTY to add an option on the fly. * * This function is *not* for general use by filesystems. * * Note: caller is responsible for locking the vfs list, if needed, * to protect mops.. */ void vfs_parsemntopts(mntopts_t *mops, char *osp, int create) { char *s = osp, *p, *nextop, *valp, *cp, *ep = NULL; int setflg = VFS_NOFORCEOPT; if (osp == NULL) return; while (*s != '\0') { p = strchr(s, ','); /* find next option */ if (p == NULL) { cp = NULL; p = s + strlen(s); } else { cp = p; /* save location of comma */ *p++ = '\0'; /* mark end and point to next option */ } nextop = p; p = strchr(s, '='); /* look for value */ if (p == NULL) { valp = NULL; /* no value supplied */ ep = NULL; } else { ep = p; /* save location of equals */ *p++ = '\0'; /* end option and point to value */ valp = p; } /* * set option into options table */ if (create) setflg |= VFS_CREATEOPT; vfs_setmntopt_nolock(mops, s, valp, setflg, 0); if (cp != NULL) *cp = ','; /* restore the comma */ if (valp != NULL) *ep = '='; /* restore the equals */ s = nextop; } } /* * Function to inquire if an option exists in a mount options table. * Returns a pointer to the option if it exists, else NULL. */ struct mntopt * vfs_hasopt(const mntopts_t *mops, const char *opt) { struct mntopt *mop; uint_t i, count; count = mops->mo_count; for (i = 0; i < count; i++) { mop = &mops->mo_list[i]; if (mop->mo_flags & MO_EMPTY) continue; if (strcmp(opt, mop->mo_name) == 0) return (mop); } return (NULL); } /* * Function to inquire if an option is set in a mount options table. * Returns non-zero if set and fills in the arg pointer with a pointer to * the argument string or NULL if there is no argument string. */ static int vfs_optionisset_nolock(const mntopts_t *mops, const char *opt, char **argp) { struct mntopt *mop; uint_t i, count; count = mops->mo_count; for (i = 0; i < count; i++) { mop = &mops->mo_list[i]; if (mop->mo_flags & MO_EMPTY) continue; if (strcmp(opt, mop->mo_name)) continue; if ((mop->mo_flags & MO_SET) == 0) return (0); if (argp != NULL && (mop->mo_flags & MO_HASVALUE) != 0) *argp = mop->mo_arg; return (1); } return (0); } int vfs_optionisset(const struct vfs *vfsp, const char *opt, char **argp) { int ret; vfs_list_read_lock(); ret = vfs_optionisset_nolock(&vfsp->vfs_mntopts, opt, argp); vfs_list_unlock(); return (ret); } /* * Construct a comma separated string of the options set in the given * mount table, return the string in the given buffer. Return non-zero if * the buffer would overflow. * * This function is *not* for general use by filesystems. * * Note: caller is responsible for locking the vfs list, if needed, * to protect mp. */ int vfs_buildoptionstr(const mntopts_t *mp, char *buf, int len) { char *cp; uint_t i; buf[0] = '\0'; cp = buf; for (i = 0; i < mp->mo_count; i++) { struct mntopt *mop; mop = &mp->mo_list[i]; if (mop->mo_flags & MO_SET) { int optlen, comma = 0; if (buf[0] != '\0') comma = 1; optlen = strlen(mop->mo_name); if (strlen(buf) + comma + optlen + 1 > len) goto err; if (comma) *cp++ = ','; (void) strcpy(cp, mop->mo_name); cp += optlen; /* * Append option value if there is one */ if (mop->mo_arg != NULL) { int arglen; arglen = strlen(mop->mo_arg); if (strlen(buf) + arglen + 2 > len) goto err; *cp++ = '='; (void) strcpy(cp, mop->mo_arg); cp += arglen; } } } return (0); err: return (EOVERFLOW); } static void vfs_freecancelopt(char **moc) { if (moc != NULL) { int ccnt = 0; char **cp; for (cp = moc; *cp != NULL; cp++) { kmem_free(*cp, strlen(*cp) + 1); ccnt++; } kmem_free(moc, (ccnt + 1) * sizeof (char *)); } } static void vfs_freeopt(mntopt_t *mop) { if (mop->mo_name != NULL) kmem_free(mop->mo_name, strlen(mop->mo_name) + 1); vfs_freecancelopt(mop->mo_cancel); if (mop->mo_arg != NULL) kmem_free(mop->mo_arg, strlen(mop->mo_arg) + 1); } /* * Free a mount options table * * This function is *not* for general use by filesystems. * * Note: caller is responsible for locking the vfs list, if needed, * to protect mp. */ void vfs_freeopttbl(mntopts_t *mp) { uint_t i, count; count = mp->mo_count; for (i = 0; i < count; i++) { vfs_freeopt(&mp->mo_list[i]); } if (count) { kmem_free(mp->mo_list, sizeof (mntopt_t) * count); mp->mo_count = 0; mp->mo_list = NULL; } } // vfs_mntdummyread // vfs_mntdummywrite // vfs_mntdummygetattr // vfs_mnttabvp_setup // vfs_mnttab_rwop // vfs_mnttab_writeop // vfs_mnttab_readop // vfs_freemnttab // vfs_mnttab_modtime // vfs_mnttab_poll // vfs_mono_time /* * Update the mnttab modification time... */ void vfs_mnttab_modtimeupd() { } /* * Unlike the real dounmount, we don't have * vn_vfswlock_held(coveredvp) */ int fake_dounmount(struct vfs *vfsp, int flag) { cred_t *cr = CRED(); vnode_t *coveredvp; int error; /* * Get covered vnode. This will be NULL if the vfs is not linked * into the file system name space (i.e., domount() with MNT_NOSPICE). */ coveredvp = vfsp->vfs_vnodecovered; /* For forcible umount, skip VFS_SYNC() since it may hang */ if ((flag & MS_FORCE) == 0) (void) VFS_SYNC(vfsp, 0, cr); /* * Test-jig specific: * Need to release rootdir before unmount or VFS_UNMOUNT * may fail due to that node being active. */ if (rootdir != NULL) { ASSERT(rootdir != coveredvp); VN_RELE(rootdir); rootdir = NULL; } /* * Lock the vfs to maintain fs status quo during unmount. This * has to be done after the sync because ufs_update tries to acquire * the vfs_reflock. */ vfs_lock_wait(vfsp); if ((error = VFS_UNMOUNT(vfsp, flag, cr)) != 0) { int err2; vfs_unlock(vfsp); /* Get rootdir back */ err2 = VFS_ROOT(vfsp, &rootdir); if (err2 != 0) { panic("fake_dounmount, get root %d\n", err2); } } else { /* * Real dounmount does vfs_remove. * * Test-jig specific: * Restore the covered rootdir, * release the rootvfs hold and clear. */ if (coveredvp != NULL) { // vfs_list_remove(vfsp); vfsp->vfs_vnodecovered = NULL; rootdir = coveredvp; } if (rootvfs == vfsp) { VFS_RELE(vfsp); rootvfs = NULL; } /* * Release the (final) reference to vfs */ vfs_unlock(vfsp); VFS_RELE(vfsp); } return (error); } // vfs_unmountall(void) // vfs_addmip // vfs_delmip // vfs_add // vfs_remove static krwlock_t vpvfsentry_ve_lock; /* * Lock a filesystem to prevent access to it while mounting, * unmounting and syncing. Return EBUSY immediately if lock * can't be acquired. */ int vfs_lock(vfs_t *vfsp) { if (rw_tryenter(&vpvfsentry_ve_lock, RW_WRITER)) return (0); return (EBUSY); } int vfs_rlock(vfs_t *vfsp) { if (rw_tryenter(&vpvfsentry_ve_lock, RW_READER)) return (0); return (EBUSY); } void vfs_lock_wait(vfs_t *vfsp) { rw_enter(&vpvfsentry_ve_lock, RW_WRITER); } void vfs_rlock_wait(vfs_t *vfsp) { rw_enter(&vpvfsentry_ve_lock, RW_READER); } /* * Unlock a locked filesystem. */ void vfs_unlock(vfs_t *vfsp) { rw_exit(&vpvfsentry_ve_lock); } /* * Utility routine that allows a filesystem to construct its * fsid in "the usual way" - by munging some underlying dev_t and * the filesystem type number into the 64-bit fsid. ... */ void vfs_make_fsid(fsid_t *fsi, dev_t dev, int val) { if (!cmpldev((dev32_t *)&fsi->val[0], dev)) panic("device number too big for fsid!"); fsi->val[1] = val; } int vfs_lock_held(vfs_t *vfsp) { int held; held = rw_write_held(&vpvfsentry_ve_lock); return (held); } // vfs_lock_owner /* * vfs list locking. */ void vfs_list_lock() { rw_enter(&vfslist, RW_WRITER); } void vfs_list_read_lock() { rw_enter(&vfslist, RW_READER); } void vfs_list_unlock() { rw_exit(&vfslist); } /* * Low level worker routines for adding entries to and removing entries from * the vfs list. */ // vfs_hash_add // vfs_hash_remove // vfs_list_add // vfs_list_remove // getvfs // vfs_devmounting /* * Search the vfs list for a specified device. Returns 1, if entry is found * or 0 if no suitable entry is found. */ int vfs_devismounted(dev_t dev) { return (0); } // vfs_dev2vfsp // vfs_mntpoint2vfsp /* * Search the vfs list for a specified vfsops. * if vfs entry is found then return 1, else 0. */ int vfs_opsinuse(vfsops_t *ops) { return (0); } /* * Allocate an entry in vfssw for a file system type */ struct vfssw * allocate_vfssw(const char *type) { struct vfssw *vswp; if (type[0] == '\0' || strlen(type) + 1 > _ST_FSTYPSZ) { /* * The vfssw table uses the empty string to identify an * available entry; we cannot add any type which has * a leading NUL. The string length is limited to * the size of the st_fstype array in struct stat. */ return (NULL); } ASSERT(VFSSW_WRITE_LOCKED()); for (vswp = &vfssw[1]; vswp < &vfssw[nfstype]; vswp++) if (!ALLOCATED_VFSSW(vswp)) { vswp->vsw_name = kmem_alloc(strlen(type) + 1, KM_SLEEP); (void) strcpy(vswp->vsw_name, type); ASSERT(vswp->vsw_count == 0); vswp->vsw_count = 1; mutex_init(&vswp->vsw_lock, NULL, MUTEX_DEFAULT, NULL); return (vswp); } return (NULL); } // vfs_to_modname // vfs_getvfssw /* * Find a vfssw entry given a file system type name. */ struct vfssw * vfs_getvfssw(const char *type) { struct vfssw *vswp; if (type == NULL || *type == '\0') return (NULL); for (vswp = &vfssw[1]; vswp < &vfssw[nfstype]; vswp++) { if (strcmp(type, vswp->vsw_name) == 0) { return (vswp); } } return (NULL); } /* * Find a vfssw entry given a file system type name. */ struct vfssw * vfs_getvfsswbyname(const char *type) { struct vfssw *vswp; ASSERT(VFSSW_LOCKED()); if (type == NULL || *type == '\0') return (NULL); for (vswp = &vfssw[1]; vswp < &vfssw[nfstype]; vswp++) { if (strcmp(type, vswp->vsw_name) == 0) { vfs_refvfssw(vswp); return (vswp); } } return (NULL); } // vfs_getvfsswbyvfsops /* * Reference a vfssw entry. */ void vfs_refvfssw(struct vfssw *vswp) { mutex_enter(&vswp->vsw_lock); vswp->vsw_count++; mutex_exit(&vswp->vsw_lock); } /* * Unreference a vfssw entry. */ void vfs_unrefvfssw(struct vfssw *vswp) { mutex_enter(&vswp->vsw_lock); vswp->vsw_count--; mutex_exit(&vswp->vsw_lock); } // vfs_syncall /* * Map VFS flags to statvfs flags. These shouldn't really be separate * flags at all. */ uint_t vf_to_stf(uint_t vf) { uint_t stf = 0; if (vf & VFS_RDONLY) stf |= ST_RDONLY; if (vf & VFS_NOSETUID) stf |= ST_NOSUID; if (vf & VFS_NOTRUNC) stf |= ST_NOTRUNC; return (stf); } // vfsstray_sync // vfsstray // vfs_EIO // vfs_EIO_sync // EIO_vfs // EIO_vfsops #pragma init(vfsinit) /* * Called from startup() to initialize all loaded vfs's */ void vfsinit(void) { vn_create_cache(); /* Temporary, until we mount root */ rootdir = vn_alloc(KM_SLEEP); rootdir->v_type = VDIR; } vfs_t * vfs_alloc(int kmflag) { vfs_t *vfsp; vfsp = kmem_alloc(sizeof (struct vfs), kmflag); /* * Do the simplest initialization here. * Everything else gets done in vfs_init() */ bzero(vfsp, sizeof (vfs_t)); return (vfsp); } void vfs_free(vfs_t *vfsp) { /* * One would be tempted to assert that "vfsp->vfs_count == 0". * Don't. See fs/vfs.c */ /* If FEM was in use, make sure everything gets cleaned up */ if (vfsp->vfs_implp) vfsimpl_teardown(vfsp); sema_destroy(&vfsp->vfs_reflock); kmem_free(vfsp, sizeof (struct vfs)); } /* * Increments the vfs reference count by one atomically. */ void vfs_hold(vfs_t *vfsp) { atomic_inc_32(&vfsp->vfs_count); ASSERT(vfsp->vfs_count != 0); } /* * Decrements the vfs reference count by one atomically. When * vfs reference count becomes zero, it calls the file system * specific vfs_freevfs() to free up the resources. */ void vfs_rele(vfs_t *vfsp) { ASSERT(vfsp->vfs_count != 0); if (atomic_dec_32_nv(&vfsp->vfs_count) == 0) { VFS_FREEVFS(vfsp); // lofi_remove(vfsp); // zone_rele_ref... // vfs_freemnttab(vfsp); vfs_free(vfsp); } } /* * Generic operations vector support. */ int fs_build_vector(void *vector, int *unused_ops, const fs_operation_trans_def_t *translation, const fs_operation_def_t *operations) { int i, num_trans, num_ops, used; /* * Count the number of translations and the number of supplied * operations. */ { const fs_operation_trans_def_t *p; for (num_trans = 0, p = translation; p->name != NULL; num_trans++, p++) ; } { const fs_operation_def_t *p; for (num_ops = 0, p = operations; p->name != NULL; num_ops++, p++) ; } /* Walk through each operation known to our caller. There will be */ /* one entry in the supplied "translation table" for each. */ used = 0; for (i = 0; i < num_trans; i++) { int j, found; char *curname; fs_generic_func_p result; fs_generic_func_p *location; curname = translation[i].name; /* Look for a matching operation in the list supplied by the */ /* file system. */ found = 0; for (j = 0; j < num_ops; j++) { if (strcmp(operations[j].name, curname) == 0) { used++; found = 1; break; } } /* * If the file system is using a "placeholder" for default * or error functions, grab the appropriate function out of * the translation table. If the file system didn't supply * this operation at all, use the default function. */ if (found) { result = operations[j].func.fs_generic; if (result == fs_default) { result = translation[i].defaultFunc; } else if (result == fs_error) { result = translation[i].errorFunc; } else if (result == NULL) { /* Null values are PROHIBITED */ return (EINVAL); } } else { result = translation[i].defaultFunc; } /* Now store the function into the operations vector. */ /* LINTED E_BAD_PTR_CAST_ALIGN */ location = (fs_generic_func_p *) (((char *)vector) + translation[i].offset); *location = result; } *unused_ops = num_ops - used; return (0); } /* Placeholder functions, should never be called. */ int fs_error(void) { cmn_err(CE_PANIC, "fs_error called"); return (0); } int fs_default(void) { cmn_err(CE_PANIC, "fs_default called"); return (0); } // rootconf // getfsname // getrootfs /* * VFS feature routines */ #define VFTINDEX(feature) (((feature) >> 32) & 0xFFFFFFFF) #define VFTBITS(feature) ((feature) & 0xFFFFFFFFLL) /* Register a feature in the vfs */ void vfs_set_feature(vfs_t *vfsp, vfs_feature_t feature) { /* Note that vfs_featureset[] is found in *vfsp->vfs_implp */ if (vfsp->vfs_implp == NULL) return; vfsp->vfs_featureset[VFTINDEX(feature)] |= VFTBITS(feature); } void vfs_clear_feature(vfs_t *vfsp, vfs_feature_t feature) { /* Note that vfs_featureset[] is found in *vfsp->vfs_implp */ if (vfsp->vfs_implp == NULL) return; vfsp->vfs_featureset[VFTINDEX(feature)] &= VFTBITS(~feature); } /* * Query a vfs for a feature. * Returns 1 if feature is present, 0 if not */ int vfs_has_feature(vfs_t *vfsp, vfs_feature_t feature) { int ret = 0; /* Note that vfs_featureset[] is found in *vfsp->vfs_implp */ if (vfsp->vfs_implp == NULL) return (ret); if (vfsp->vfs_featureset[VFTINDEX(feature)] & VFTBITS(feature)) ret = 1; return (ret); } // vfs_propagate_features // vfs_get_lofi