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freebsd-dev/sys/kern/vfs_init.c

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/* -> /*- for copyright notices, minor format tweaks as necessary
2005-01-06 23:35:40 +00:00
/*-
sys: further adoption of SPDX licensing ID tags. Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point.
2017-11-20 19:43:44 +00:00
* SPDX-License-Identifier: BSD-3-Clause
*
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed
* to Berkeley by John Heidemann of the UCLA Ficus project.
*
* Source: * @(#)i405_init.c 2.10 92/04/27 UCLA Ficus project
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
Renumber license clauses in sys/kern to avoid skipping #3
2016-09-15 13:16:20 +00:00
* 3. Neither the name of the University nor the names of its contributors
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)vfs_init.c 8.3 (Berkeley) 1/4/94
*/
Use __FBSDID().
2003-06-11 00:56:59 +00:00
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
#include <sys/param.h>
Fix up some sloppy coding practices: - Delete redundant declarations. - Add -Wredundant-declarations to Makefile.i386 so they don't come back. - Delete sloppy COMMON-style declarations of uninitialized data in header files. - Add a few prototypes. - Clean up warnings resulting from the above. NB: ioconf.c will still generate a redundant-declaration warning, which is unavoidable unless somebody volunteers to make `config' smarter.
1994-08-18 22:36:09 +00:00
#include <sys/systm.h>
Modify vfs_register() to use a hash calculation on vfc_name to set vfc_typenum, so that vfc_typenum doesn't change when file systems are loaded in different orders. This keeps NFS file handles from changing, for file systems that use vfc_typenum in their fsid. This change is controlled via a loader.conf variable called vfs.typenumhash, since vfc_typenum will change once when this is enabled. It defaults to 1 for 9.0, but will default to 0 when MFC'd to stable/8. Tested by: hrs Reviewed by: jhb, pjd (earlier version) Approved by: re (kib) MFC after: 1 month
2011-09-13 21:01:26 +00:00
#include <sys/fnv_hash.h>
Make it easier for filesystems to count themselves as jail-enabled, by doing most of the work in a new function prison_add_vfs in kern_jail.c Now a jail-enabled filesystem need only mark itself with VFCF_JAIL, and the rest is taken care of. This includes adding a jail parameter like allow.mount.foofs, and a sysctl like security.jail.mount_foofs_allowed. Both of these used to be a static list of known filesystems, with predefined permission bits. Reviewed by: kib Differential Revision: D14681
2018-05-04 20:54:27 +00:00
#include <sys/jail.h>
Implemented loadable VFS modules, and made most existing filesystems loadable. (NFS is a notable exception.)
1994-09-21 03:47:43 +00:00
#include <sys/kernel.h>
Introduce vfs_byname_kld() which will try to load the filesystem as a module if possible. Use it so we don't have linker magic in the middle of the already complex mount code.
2004-12-03 16:11:01 +00:00
#include <sys/linker.h>
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
#include <sys/mount.h>
Introduce vfs_byname_kld() which will try to load the filesystem as a module if possible. Use it so we don't have linker magic in the middle of the already complex mount code.
2004-12-03 16:11:01 +00:00
#include <sys/proc.h>
Remove Giant acquisition from the mount and unmount pathes. It could be claimed that two things were reasonable protected by Giant. One is vfsconf list links, which is converted to the new dedicated sx vfsconf_sx. Another is vfsconf.vfc_refcount, which is now updated with atomics. Note that vfc_refcount still has the same races now as it has under the Giant, the unload of filesystem modules can happen while the module is still in use. Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks
2014-08-03 03:27:54 +00:00
#include <sys/sx.h>
Use kern_kldload() and kern_kldunload() to load and unload modules when we intend for the user to be able to unload them later via kldunload(2) instead of calling linker_load_module() and then directly adjusting the ref count on the linker file structure. This makes the resulting consumer code simpler and cleaner and better hides the linker internals making it possible to sanely lock the linker.
2006-06-13 21:36:23 +00:00
#include <sys/syscallsubr.h>
Ignore the statically configured vfs type numbers and assign vfs type numbers in vfs attach order (modulo incomplete reuse of old numbers after vfs LKMs are unloaded). This requires reinitializing the sysctl tree (or at least the vfs subtree) for vfs's that support sysctls (currently only nfs). sysctl_order() already handled reinitialization reasonably except it checked for annulled self references in the wrong place. Fixed sysctls for vfs LKMs.
1998-09-05 17:13:28 +00:00
#include <sys/sysctl.h>
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
#include <sys/vnode.h>
#include <sys/malloc.h>
Make various mountpoint related functions static.
2005-02-10 12:25:38 +00:00
static int vfs_register(struct vfsconf *);
static int vfs_unregister(struct vfsconf *);
Reviewed by: julian with quick glances by bruce and others Submitted by: terry (terry lambert) This is a composite of 3 patch sets submitted by terry. they are: New low-level init code that supports loadbal modules better some cleanups in the namei code to help terry in 16-bit character support some changes to the mount-root code to make it a little more modular.. NOTE: mounting root off cdrom or NFS MIGHT be broken as I haven't been able to test those cases.. certainly mounting root of disk still works just fine.. mfs should work but is untested. (tomorrows task) The low level init stuff includes a total rewrite of init_main.c to make it possible for new modules to have an init phase by simply adding an entry to a TEXT_SET (or is it DATA_SET) list. thus a new module can be added to the kernel without editing any other files other than the 'files' file.
1995-08-28 09:19:25 +00:00
Last major round (Unless Bruce thinks of somthing :-) of malloc changes. Distribute all but the most fundamental malloc types. This time I also remembered the trick to making things static: Put "static" in front of them. A couple of finer points by: bde
1997-10-12 20:26:33 +00:00
MALLOC_DEFINE(M_VNODE, "vnodes", "Dynamically allocated vnodes");
Change the M_NAMEI allocations to use the zone allocator. This change plus the previous changes to use the zone allocator decrease the useage of malloc by half. The Zone allocator will be upgradeable to be able to use per CPU-pools, and has more intelligent usage of SPLs. Additionally, it has reasonable stats gathering capabilities, while making most calls inline.
1997-09-21 04:24:27 +00:00
/*
Untangle vfsinit() a bit. Use seperate sysinit functions rather than having a super-function calling bits all over the place.
2000-12-06 07:09:08 +00:00
* The highest defined VFS number.
Change the M_NAMEI allocations to use the zone allocator. This change plus the previous changes to use the zone allocator decrease the useage of malloc by half. The Zone allocator will be upgradeable to be able to use per CPU-pools, and has more intelligent usage of SPLs. Additionally, it has reasonable stats gathering capabilities, while making most calls inline.
1997-09-21 04:24:27 +00:00
*/
Untangle vfsinit() a bit. Use seperate sysinit functions rather than having a super-function calling bits all over the place.
2000-12-06 07:09:08 +00:00
int maxvfsconf = VFS_GENERIC + 1;
Document all functions, global and static variables, and sysctls. Includes some minor whitespace changes, and re-ordering to be able to document properly (e.g, grouping of variables and the SYSCTL macro calls for them, where the documentation has been added.) Reviewed by: phk (but all errors are mine)
2002-03-05 15:38:49 +00:00
/*
* Single-linked list of configured VFSes.
* New entries are added/deleted by vfs_register()/vfs_unregister()
*/
Convert the vfsconf list to a TAILQ. Introduce vfs_byname() function to find things on it. Staticize vfs_nmount() function under the name vfs_donmount(). Various cleanups.
2004-07-27 22:32:01 +00:00
struct vfsconfhead vfsconf = TAILQ_HEAD_INITIALIZER(vfsconf);
Remove Giant acquisition from the mount and unmount pathes. It could be claimed that two things were reasonable protected by Giant. One is vfsconf list links, which is converted to the new dedicated sx vfsconf_sx. Another is vfsconf.vfc_refcount, which is now updated with atomics. Note that vfc_refcount still has the same races now as it has under the Giant, the unload of filesystem modules can happen while the module is still in use. Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks
2014-08-03 03:27:54 +00:00
struct sx vfsconf_sx;
SX_SYSINIT(vfsconf, &vfsconf_sx, "vfsconf");
Move a couple of globals here where they are initialised, rather than orphaning them in vfs_conf.c
1999-11-01 23:54:07 +00:00
Modify vfs_register() to use a hash calculation on vfc_name to set vfc_typenum, so that vfc_typenum doesn't change when file systems are loaded in different orders. This keeps NFS file handles from changing, for file systems that use vfc_typenum in their fsid. This change is controlled via a loader.conf variable called vfs.typenumhash, since vfc_typenum will change once when this is enabled. It defaults to 1 for 9.0, but will default to 0 when MFC'd to stable/8. Tested by: hrs Reviewed by: jhb, pjd (earlier version) Approved by: re (kib) MFC after: 1 month
2011-09-13 21:01:26 +00:00
/*
* Loader.conf variable vfs.typenumhash enables setting vfc_typenum using a hash
* calculation on vfc_name, so that it doesn't change when file systems are
* loaded in a different order. This will avoid the NFS server file handles from
* changing for file systems that use vfc_typenum in their fsid.
*/
static int vfs_typenumhash = 1;
SYSCTL_INT(_vfs, OID_AUTO, typenumhash, CTLFLAG_RDTUN, &vfs_typenumhash, 0,
"Set vfc_typenum using a hash calculation on vfc_name, so that it does not"
"change when file systems are loaded in a different order.");
Simplify initialization of va_null a little bit.
2004-09-15 21:42:03 +00:00
/*
* A Zen vnode attribute structure.
*
* Initialized when the first filesystem registers by vfs_register().
*/
struct vattr va_null;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
/*
* vfs_init.c
*
* Allocate and fill in operations vectors.
*
* An undocumented feature of this approach to defining operations is that
* there can be multiple entries in vfs_opv_descs for the same operations
* vector. This allows third parties to extend the set of operations
* supported by another layer in a binary compatibile way. For example,
* assume that NFS needed to be modified to support Ficus. NFS has an entry
* (probably nfs_vnopdeop_decls) declaring all the operations NFS supports by
* default. Ficus could add another entry (ficus_nfs_vnodeop_decl_entensions)
* listing those new operations Ficus adds to NFS, all without modifying the
* NFS code. (Of couse, the OTW NFS protocol still needs to be munged, but
* that is a(whole)nother story.) This is a feature.
*/
Make the vnode opv vector construction fully dynamic. Previously we leaked memory on each unload and were limited to items referenced in the kernel copy of vnode_if.c. Now a kernel module is free to create it's own VOP_FOO() routines and the rest of the system will happily deal with it, including passthrough layers like union/umap/etc. Have VFS_SET() call a common vfs_modevent() handler rather than inline duplicating the common code all over the place. Have VNODEOP_SET() have the vnodeops removed at unload time (assuming a module) so that the vop_t ** vector is reclaimed. Slightly adjust the vop_t ** vectors so that calling slot 0 is a panic rather than a page fault. This could happen if VOP_something() was called without *any* handlers being present anywhere (including in vfs_default.c). slot 1 becomes the default vector for the vnodeop table. TODO: reclaim zones on unload (eg: nfs code)
1998-11-10 09:04:09 +00:00
Back when VOP_* was introduced, we did not have new-style struct initializations but we did have lofty goals and big ideals. Adjust to more contemporary circumstances and gain type checking. Replace the entire vop_t frobbing thing with properly typed structures. The only casualty is that we can not add a new VOP_ method with a loadable module. History has not given us reason to belive this would ever be feasible in the the first place. Eliminate in toto VOCALL(), vop_t, VNODEOP_SET() etc. Give coda correct prototypes and function definitions for all vop_()s. Generate a bit more data from the vnode_if.src file: a struct vop_vector and protype typedefs for all vop methods. Add a new vop_bypass() and make vop_default be a pointer to another struct vop_vector. Remove a lot of vfs_init since vop_vector is ready to use from the compiler. Cast various vop_mumble() to void * with uppercase name, for instance VOP_PANIC, VOP_NULL etc. Implement VCALL() by making vdesc_offset the offsetof() the relevant function pointer in vop_vector. This is disgusting but since the code is generated by a script comparatively safe. The alternative for nullfs etc. would be much worse. Fix up all vnode method vectors to remove casts so they become typesafe. (The bulk of this is generated by scripts)
2004-12-01 23:16:38 +00:00
/*
* Routines having to do with the management of the vnode table.
*/
Make the vnode opv vector construction fully dynamic. Previously we leaked memory on each unload and were limited to items referenced in the kernel copy of vnode_if.c. Now a kernel module is free to create it's own VOP_FOO() routines and the rest of the system will happily deal with it, including passthrough layers like union/umap/etc. Have VFS_SET() call a common vfs_modevent() handler rather than inline duplicating the common code all over the place. Have VNODEOP_SET() have the vnodeops removed at unload time (assuming a module) so that the vop_t ** vector is reclaimed. Slightly adjust the vop_t ** vectors so that calling slot 0 is a panic rather than a page fault. This could happen if VOP_something() was called without *any* handlers being present anywhere (including in vfs_default.c). slot 1 becomes the default vector for the vnodeop table. TODO: reclaim zones on unload (eg: nfs code)
1998-11-10 09:04:09 +00:00
Remove Giant acquisition from the mount and unmount pathes. It could be claimed that two things were reasonable protected by Giant. One is vfsconf list links, which is converted to the new dedicated sx vfsconf_sx. Another is vfsconf.vfc_refcount, which is now updated with atomics. Note that vfc_refcount still has the same races now as it has under the Giant, the unload of filesystem modules can happen while the module is still in use. Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks
2014-08-03 03:27:54 +00:00
static struct vfsconf *
vfs_byname_locked(const char *name)
Convert the vfsconf list to a TAILQ. Introduce vfs_byname() function to find things on it. Staticize vfs_nmount() function under the name vfs_donmount(). Various cleanups.
2004-07-27 22:32:01 +00:00
{
struct vfsconf *vfsp;
Remove Giant acquisition from the mount and unmount pathes. It could be claimed that two things were reasonable protected by Giant. One is vfsconf list links, which is converted to the new dedicated sx vfsconf_sx. Another is vfsconf.vfc_refcount, which is now updated with atomics. Note that vfc_refcount still has the same races now as it has under the Giant, the unload of filesystem modules can happen while the module is still in use. Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks
2014-08-03 03:27:54 +00:00
sx_assert(&vfsconf_sx, SA_LOCKED);
make "ffs" and alias for "ufs" when it comes to filesystem names.
2004-12-06 22:22:57 +00:00
if (!strcmp(name, "ffs"))
name = "ufs";
Remove Giant acquisition from the mount and unmount pathes. It could be claimed that two things were reasonable protected by Giant. One is vfsconf list links, which is converted to the new dedicated sx vfsconf_sx. Another is vfsconf.vfc_refcount, which is now updated with atomics. Note that vfc_refcount still has the same races now as it has under the Giant, the unload of filesystem modules can happen while the module is still in use. Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks
2014-08-03 03:27:54 +00:00
TAILQ_FOREACH(vfsp, &vfsconf, vfc_list) {
Convert the vfsconf list to a TAILQ. Introduce vfs_byname() function to find things on it. Staticize vfs_nmount() function under the name vfs_donmount(). Various cleanups.
2004-07-27 22:32:01 +00:00
if (!strcmp(name, vfsp->vfc_name))
return (vfsp);
Remove Giant acquisition from the mount and unmount pathes. It could be claimed that two things were reasonable protected by Giant. One is vfsconf list links, which is converted to the new dedicated sx vfsconf_sx. Another is vfsconf.vfc_refcount, which is now updated with atomics. Note that vfc_refcount still has the same races now as it has under the Giant, the unload of filesystem modules can happen while the module is still in use. Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks
2014-08-03 03:27:54 +00:00
}
Convert the vfsconf list to a TAILQ. Introduce vfs_byname() function to find things on it. Staticize vfs_nmount() function under the name vfs_donmount(). Various cleanups.
2004-07-27 22:32:01 +00:00
return (NULL);
}
Remove Giant acquisition from the mount and unmount pathes. It could be claimed that two things were reasonable protected by Giant. One is vfsconf list links, which is converted to the new dedicated sx vfsconf_sx. Another is vfsconf.vfc_refcount, which is now updated with atomics. Note that vfc_refcount still has the same races now as it has under the Giant, the unload of filesystem modules can happen while the module is still in use. Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks
2014-08-03 03:27:54 +00:00
struct vfsconf *
vfs_byname(const char *name)
{
struct vfsconf *vfsp;
vfsconf_slock();
vfsp = vfs_byname_locked(name);
vfsconf_sunlock();
return (vfsp);
}
Introduce vfs_byname_kld() which will try to load the filesystem as a module if possible. Use it so we don't have linker magic in the middle of the already complex mount code.
2004-12-03 16:11:01 +00:00
struct vfsconf *
vfs_byname_kld(const char *fstype, struct thread *td, int *error)
{
struct vfsconf *vfsp;
Don't worry if a module is already loaded when looking for a fstype to mount (possible in a race condition). Reviewed by: kib MFC after: 1 week
2013-02-21 02:41:37 +00:00
int fileid, loaded;
Introduce vfs_byname_kld() which will try to load the filesystem as a module if possible. Use it so we don't have linker magic in the middle of the already complex mount code.
2004-12-03 16:11:01 +00:00
vfsp = vfs_byname(fstype);
if (vfsp != NULL)
return (vfsp);
Remove duplicate security checks already performed in kern_kldload().
2006-06-26 18:33:32 +00:00
/* Try to load the respective module. */
Use kern_kldload() and kern_kldunload() to load and unload modules when we intend for the user to be able to unload them later via kldunload(2) instead of calling linker_load_module() and then directly adjusting the ref count on the linker file structure. This makes the resulting consumer code simpler and cleaner and better hides the linker internals making it possible to sanely lock the linker.
2006-06-13 21:36:23 +00:00
*error = kern_kldload(td, fstype, &fileid);
Don't worry if a module is already loaded when looking for a fstype to mount (possible in a race condition). Reviewed by: kib MFC after: 1 week
2013-02-21 02:41:37 +00:00
loaded = (*error == 0);
if (*error == EEXIST)
*error = 0;
Introduce vfs_byname_kld() which will try to load the filesystem as a module if possible. Use it so we don't have linker magic in the middle of the already complex mount code.
2004-12-03 16:11:01 +00:00
if (*error)
return (NULL);
Use kern_kldload() and kern_kldunload() to load and unload modules when we intend for the user to be able to unload them later via kldunload(2) instead of calling linker_load_module() and then directly adjusting the ref count on the linker file structure. This makes the resulting consumer code simpler and cleaner and better hides the linker internals making it possible to sanely lock the linker.
2006-06-13 21:36:23 +00:00
Introduce vfs_byname_kld() which will try to load the filesystem as a module if possible. Use it so we don't have linker magic in the middle of the already complex mount code.
2004-12-03 16:11:01 +00:00
/* Look up again to see if the VFS was loaded. */
vfsp = vfs_byname(fstype);
if (vfsp == NULL) {
Don't worry if a module is already loaded when looking for a fstype to mount (possible in a race condition). Reviewed by: kib MFC after: 1 week
2013-02-21 02:41:37 +00:00
if (loaded)
(void)kern_kldunload(td, fileid, LINKER_UNLOAD_FORCE);
Introduce vfs_byname_kld() which will try to load the filesystem as a module if possible. Use it so we don't have linker magic in the middle of the already complex mount code.
2004-12-03 16:11:01 +00:00
*error = ENODEV;
return (NULL);
}
return (vfsp);
}
Only call sigdeferstop() for NFS. Use bypass to catch any NFS VOP dispatch and route it through the wrapper which does sigdeferstop() and then dispatches original VOP. NFS does not need a bypass below it, which is not supported. The vop offset in the vop_vector is added since otherwise it is impossible to get vop_op_t from the internal table, and I did not wanted to create the layered fs only to wrap NFS VOPs. VFS_OP()s wrap is straightforward. Requested and reviewed by: mjg (previous version) Tested by: pho Sponsored by: The FreeBSD Foundation Differential revision: https://reviews.freebsd.org/D17658
2018-10-23 21:43:41 +00:00
static int
vfs_mount_sigdefer(struct mount *mp)
{
int prev_stops, rc;
TSRAW(curthread, TS_ENTER, "VFS_MOUNT", mp->mnt_vfc->vfc_name);
prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_mount)(mp);
sigallowstop(prev_stops);
TSRAW(curthread, TS_EXIT, "VFS_MOUNT", mp->mnt_vfc->vfc_name);
return (rc);
}
static int
vfs_unmount_sigdefer(struct mount *mp, int mntflags)
{
int prev_stops, rc;
prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_unmount)(mp, mntflags);
sigallowstop(prev_stops);
return (rc);
}
static int
vfs_root_sigdefer(struct mount *mp, int flags, struct vnode **vpp)
{
int prev_stops, rc;
prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_root)(mp, flags, vpp);
sigallowstop(prev_stops);
return (rc);
}
vfs: add optional root vnode caching Root vnodes looekd up all the time, e.g. when crossing a mount point. Currently used routines always perform a costly lookup which can be trivially avoided. Reviewed by: jeff (previous version), kib Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D21646
2019-10-06 22:14:32 +00:00
static int
vfs_cachedroot_sigdefer(struct mount *mp, int flags, struct vnode **vpp)
{
int prev_stops, rc;
prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_cachedroot)(mp, flags, vpp);
sigallowstop(prev_stops);
return (rc);
}
Only call sigdeferstop() for NFS. Use bypass to catch any NFS VOP dispatch and route it through the wrapper which does sigdeferstop() and then dispatches original VOP. NFS does not need a bypass below it, which is not supported. The vop offset in the vop_vector is added since otherwise it is impossible to get vop_op_t from the internal table, and I did not wanted to create the layered fs only to wrap NFS VOPs. VFS_OP()s wrap is straightforward. Requested and reviewed by: mjg (previous version) Tested by: pho Sponsored by: The FreeBSD Foundation Differential revision: https://reviews.freebsd.org/D17658
2018-10-23 21:43:41 +00:00
static int
vfs_quotactl_sigdefer(struct mount *mp, int cmd, uid_t uid, void *arg)
{
int prev_stops, rc;
prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_quotactl)(mp, cmd, uid, arg);
sigallowstop(prev_stops);
return (rc);
}
static int
vfs_statfs_sigdefer(struct mount *mp, struct statfs *sbp)
{
int prev_stops, rc;
prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_statfs)(mp, sbp);
sigallowstop(prev_stops);
return (rc);
}
static int
vfs_sync_sigdefer(struct mount *mp, int waitfor)
{
int prev_stops, rc;
prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_sync)(mp, waitfor);
sigallowstop(prev_stops);
return (rc);
}
static int
vfs_vget_sigdefer(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
{
int prev_stops, rc;
prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_vget)(mp, ino, flags, vpp);
sigallowstop(prev_stops);
return (rc);
}
static int
vfs_fhtovp_sigdefer(struct mount *mp, struct fid *fidp, int flags,
struct vnode **vpp)
{
int prev_stops, rc;
prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_fhtovp)(mp, fidp, flags, vpp);
sigallowstop(prev_stops);
return (rc);
}
static int
vfs_checkexp_sigdefer(struct mount *mp, struct sockaddr *nam, int *exflg,
struct ucred **credp, int *numsecflavors, int **secflavors)
{
int prev_stops, rc;
prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_checkexp)(mp, nam, exflg, credp,
numsecflavors, secflavors);
sigallowstop(prev_stops);
return (rc);
}
static int
vfs_extattrctl_sigdefer(struct mount *mp, int cmd, struct vnode *filename_vp,
int attrnamespace, const char *attrname)
{
int prev_stops, rc;
prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_extattrctl)(mp, cmd,
filename_vp, attrnamespace, attrname);
sigallowstop(prev_stops);
return (rc);
}
static int
vfs_sysctl_sigdefer(struct mount *mp, fsctlop_t op, struct sysctl_req *req)
{
int prev_stops, rc;
prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_sysctl)(mp, op, req);
sigallowstop(prev_stops);
return (rc);
}
static void
vfs_susp_clean_sigdefer(struct mount *mp)
{
int prev_stops;
if (*mp->mnt_vfc->vfc_vfsops_sd->vfs_susp_clean == NULL)
return;
prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
(*mp->mnt_vfc->vfc_vfsops_sd->vfs_susp_clean)(mp);
sigallowstop(prev_stops);
}
static void
vfs_reclaim_lowervp_sigdefer(struct mount *mp, struct vnode *vp)
{
int prev_stops;
if (*mp->mnt_vfc->vfc_vfsops_sd->vfs_reclaim_lowervp == NULL)
return;
prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
(*mp->mnt_vfc->vfc_vfsops_sd->vfs_reclaim_lowervp)(mp, vp);
sigallowstop(prev_stops);
}
static void
vfs_unlink_lowervp_sigdefer(struct mount *mp, struct vnode *vp)
{
int prev_stops;
if (*mp->mnt_vfc->vfc_vfsops_sd->vfs_unlink_lowervp == NULL)
return;
prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
(*(mp)->mnt_vfc->vfc_vfsops_sd->vfs_unlink_lowervp)(mp, vp);
sigallowstop(prev_stops);
}
static void
vfs_purge_sigdefer(struct mount *mp)
{
int prev_stops;
prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
(*mp->mnt_vfc->vfc_vfsops_sd->vfs_purge)(mp);
sigallowstop(prev_stops);
}
static struct vfsops vfsops_sigdefer = {
.vfs_mount = vfs_mount_sigdefer,
.vfs_unmount = vfs_unmount_sigdefer,
.vfs_root = vfs_root_sigdefer,
vfs: add optional root vnode caching Root vnodes looekd up all the time, e.g. when crossing a mount point. Currently used routines always perform a costly lookup which can be trivially avoided. Reviewed by: jeff (previous version), kib Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D21646
2019-10-06 22:14:32 +00:00
.vfs_cachedroot = vfs_cachedroot_sigdefer,
Only call sigdeferstop() for NFS. Use bypass to catch any NFS VOP dispatch and route it through the wrapper which does sigdeferstop() and then dispatches original VOP. NFS does not need a bypass below it, which is not supported. The vop offset in the vop_vector is added since otherwise it is impossible to get vop_op_t from the internal table, and I did not wanted to create the layered fs only to wrap NFS VOPs. VFS_OP()s wrap is straightforward. Requested and reviewed by: mjg (previous version) Tested by: pho Sponsored by: The FreeBSD Foundation Differential revision: https://reviews.freebsd.org/D17658
2018-10-23 21:43:41 +00:00
.vfs_quotactl = vfs_quotactl_sigdefer,
.vfs_statfs = vfs_statfs_sigdefer,
.vfs_sync = vfs_sync_sigdefer,
.vfs_vget = vfs_vget_sigdefer,
.vfs_fhtovp = vfs_fhtovp_sigdefer,
.vfs_checkexp = vfs_checkexp_sigdefer,
.vfs_extattrctl = vfs_extattrctl_sigdefer,
.vfs_sysctl = vfs_sysctl_sigdefer,
.vfs_susp_clean = vfs_susp_clean_sigdefer,
.vfs_reclaim_lowervp = vfs_reclaim_lowervp_sigdefer,
.vfs_unlink_lowervp = vfs_unlink_lowervp_sigdefer,
.vfs_purge = vfs_purge_sigdefer,
};
Introduce vfs_byname_kld() which will try to load the filesystem as a module if possible. Use it so we don't have linker magic in the middle of the already complex mount code.
2004-12-03 16:11:01 +00:00
More s/file system/filesystem/g
2002-05-16 21:28:32 +00:00
/* Register a new filesystem type in the global table */
Make various mountpoint related functions static.
2005-02-10 12:25:38 +00:00
static int
Make the vnode opv vector construction fully dynamic. Previously we leaked memory on each unload and were limited to items referenced in the kernel copy of vnode_if.c. Now a kernel module is free to create it's own VOP_FOO() routines and the rest of the system will happily deal with it, including passthrough layers like union/umap/etc. Have VFS_SET() call a common vfs_modevent() handler rather than inline duplicating the common code all over the place. Have VNODEOP_SET() have the vnodeops removed at unload time (assuming a module) so that the vop_t ** vector is reclaimed. Slightly adjust the vop_t ** vectors so that calling slot 0 is a panic rather than a page fault. This could happen if VOP_something() was called without *any* handlers being present anywhere (including in vfs_default.c). slot 1 becomes the default vector for the vnodeop table. TODO: reclaim zones on unload (eg: nfs code)
1998-11-10 09:04:09 +00:00
vfs_register(struct vfsconf *vfc)
*gulp*. Jordan specifically OK'ed this.. This is the bulk of the support for doing kld modules. Two linker_sets were replaced by SYSINIT()'s. VFS's and exec handlers are self registered. kld is now a superset of lkm. I have converted most of them, they will follow as a seperate commit as samples. This all still works as a static a.out kernel using LKM's.
1998-10-16 03:55:01 +00:00
{
* Register sysctl nodes before running sysinits when loading files and unregister them after sysuninits when unloading. * Add code to vfs_register() to set the oid number of vfs sysctls to the type number of the filesystem. Reviewed by: bde
1999-03-07 16:06:41 +00:00
struct sysctl_oid *oidp;
Initialize struct vfsops C99-sparsely. Submitted by: hmp Reviewed by: phk
2003-06-12 20:48:38 +00:00
struct vfsops *vfsops;
Simplify initialization of va_null a little bit.
2004-09-15 21:42:03 +00:00
static int once;
Modify vfs_register() to use a hash calculation on vfc_name to set vfc_typenum, so that vfc_typenum doesn't change when file systems are loaded in different orders. This keeps NFS file handles from changing, for file systems that use vfc_typenum in their fsid. This change is controlled via a loader.conf variable called vfs.typenumhash, since vfc_typenum will change once when this is enabled. It defaults to 1 for 9.0, but will default to 0 when MFC'd to stable/8. Tested by: hrs Reviewed by: jhb, pjd (earlier version) Approved by: re (kib) MFC after: 1 month
2011-09-13 21:01:26 +00:00
struct vfsconf *tvfc;
uint32_t hashval;
int secondpass;
Simplify initialization of va_null a little bit.
2004-09-15 21:42:03 +00:00
if (!once) {
vattr_null(&va_null);
once = 1;
}
Initialize struct vfsops C99-sparsely. Submitted by: hmp Reviewed by: phk
2003-06-12 20:48:38 +00:00
Put a version element in the VFS filesystem configuration structure and refuse initializing filesystems with a wrong version. This will aid maintenance activites on the 5-stable branch. s/vfs_mount/vfs_omount/ s/vfs_nmount/vfs_mount/ Name our filesystems mount function consistently. Eliminate the namiedata argument to both vfs_mount and vfs_omount. It was originally there to save stack space. A few places abused it to get hold of some credentials to pass around. Effectively it is unused. Reorganize the root filesystem selection code.
2004-07-30 22:08:52 +00:00
if (vfc->vfc_version != VFS_VERSION) {
printf("ERROR: filesystem %s, unsupported ABI version %x\n",
vfc->vfc_name, vfc->vfc_version);
return (EINVAL);
}
Remove Giant acquisition from the mount and unmount pathes. It could be claimed that two things were reasonable protected by Giant. One is vfsconf list links, which is converted to the new dedicated sx vfsconf_sx. Another is vfsconf.vfc_refcount, which is now updated with atomics. Note that vfc_refcount still has the same races now as it has under the Giant, the unload of filesystem modules can happen while the module is still in use. Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks
2014-08-03 03:27:54 +00:00
vfsconf_lock();
if (vfs_byname_locked(vfc->vfc_name) != NULL) {
vfsconf_unlock();
Remove the support for using non-mpsafe filesystem modules. In particular, do not lock Giant conditionally when calling into the filesystem module, remove the VFS_LOCK_GIANT() and related macros. Stop handling buffers belonging to non-mpsafe filesystems. The VFS_VERSION is bumped to indicate the interface change which does not result in the interface signatures changes. Conducted and reviewed by: attilio Tested by: pho
2012-10-22 17:50:54 +00:00
return (EEXIST);
Remove Giant acquisition from the mount and unmount pathes. It could be claimed that two things were reasonable protected by Giant. One is vfsconf list links, which is converted to the new dedicated sx vfsconf_sx. Another is vfsconf.vfc_refcount, which is now updated with atomics. Note that vfc_refcount still has the same races now as it has under the Giant, the unload of filesystem modules can happen while the module is still in use. Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks
2014-08-03 03:27:54 +00:00
}
*gulp*. Jordan specifically OK'ed this.. This is the bulk of the support for doing kld modules. Two linker_sets were replaced by SYSINIT()'s. VFS's and exec handlers are self registered. kld is now a superset of lkm. I have converted most of them, they will follow as a seperate commit as samples. This all still works as a static a.out kernel using LKM's.
1998-10-16 03:55:01 +00:00
Modify vfs_register() to use a hash calculation on vfc_name to set vfc_typenum, so that vfc_typenum doesn't change when file systems are loaded in different orders. This keeps NFS file handles from changing, for file systems that use vfc_typenum in their fsid. This change is controlled via a loader.conf variable called vfs.typenumhash, since vfc_typenum will change once when this is enabled. It defaults to 1 for 9.0, but will default to 0 when MFC'd to stable/8. Tested by: hrs Reviewed by: jhb, pjd (earlier version) Approved by: re (kib) MFC after: 1 month
2011-09-13 21:01:26 +00:00
if (vfs_typenumhash != 0) {
/*
* Calculate a hash on vfc_name to use for vfc_typenum. Unless
* all of 1<->255 are assigned, it is limited to 8bits since
* that is what ZFS uses from vfc_typenum and is also the
* preferred range for vfs_getnewfsid().
*/
hashval = fnv_32_str(vfc->vfc_name, FNV1_32_INIT);
hashval &= 0xff;
secondpass = 0;
do {
/* Look for and fix any collision. */
TAILQ_FOREACH(tvfc, &vfsconf, vfc_list) {
if (hashval == tvfc->vfc_typenum) {
if (hashval == 255 && secondpass == 0) {
hashval = 1;
secondpass = 1;
} else
hashval++;
break;
}
}
} while (tvfc != NULL);
vfc->vfc_typenum = hashval;
if (vfc->vfc_typenum >= maxvfsconf)
maxvfsconf = vfc->vfc_typenum + 1;
} else
vfc->vfc_typenum = maxvfsconf++;
Convert the vfsconf list to a TAILQ. Introduce vfs_byname() function to find things on it. Staticize vfs_nmount() function under the name vfs_donmount(). Various cleanups.
2004-07-27 22:32:01 +00:00
TAILQ_INSERT_TAIL(&vfsconf, vfc, vfc_list);
*gulp*. Jordan specifically OK'ed this.. This is the bulk of the support for doing kld modules. Two linker_sets were replaced by SYSINIT()'s. VFS's and exec handlers are self registered. kld is now a superset of lkm. I have converted most of them, they will follow as a seperate commit as samples. This all still works as a static a.out kernel using LKM's.
1998-10-16 03:55:01 +00:00
Initialize struct vfsops C99-sparsely. Submitted by: hmp Reviewed by: phk
2003-06-12 20:48:38 +00:00
/*
* Initialise unused ``struct vfsops'' fields, to use
* the vfs_std*() functions. Note, we need the mount
* and unmount operations, at the least. The check
* for vfsops available is just a debugging aid.
*/
KASSERT(vfc->vfc_vfsops != NULL,
("Filesystem %s has no vfsops", vfc->vfc_name));
/*
* Check the mount and unmount operations.
*/
vfsops = vfc->vfc_vfsops;
The remaining part of nmount/omount/rootfs mount changes. I cannot sensibly split the conversion of the remaining three filesystems out from the root mounting changes, so in one go: cd9660: Convert to nmount. Add omount compat shims. Remove dedicated rootfs mounting code. Use vfs_mountedfrom() Rely on vfs_mount.c calling VFS_STATFS() nfs(client): Convert to nmount (the simple way, mount_nfs(8) is still necessary). Add omount compat shims. Drop COMPAT_PRELITE2 mount arg compatibility. ffs: Convert to nmount. Add omount compat shims. Remove dedicated rootfs mounting code. Use vfs_mountedfrom() Rely on vfs_mount.c calling VFS_STATFS() Remove vfs_omount() method, all filesystems are now converted. Remove MNTK_WANTRDWR, handling RO/RW conversions is a filesystem task, and they all do it now. Change rootmounting to use DEVFS trampoline: vfs_mount.c: Mount devfs on /. Devfs needs no 'from' so this is clean. symlink /dev to /. This makes it possible to lookup /dev/foo. Mount "real" root filesystem on /. Surgically move the devfs mountpoint from under the real root filesystem onto /dev in the real root filesystem. Remove now unnecessary getdiskbyname(). kern_init.c: Don't do devfs mounting and rootvnode assignment here, it was already handled by vfs_mount.c. Remove now unused bdevvp(), addaliasu() and addalias(). Put the few necessary lines in devfs where they belong. This eliminates the second-last source of bogo vnodes, leaving only the lemming-syncer. Remove rootdev variable, it doesn't give meaning in a global context and was not trustworth anyway. Correct information is provided by statfs(/).
2004-12-07 08:15:41 +00:00
KASSERT(vfsops->vfs_mount != NULL,
("Filesystem %s has no mount op", vfc->vfc_name));
Initialize struct vfsops C99-sparsely. Submitted by: hmp Reviewed by: phk
2003-06-12 20:48:38 +00:00
KASSERT(vfsops->vfs_unmount != NULL,
("Filesystem %s has no unmount op", vfc->vfc_name));
if (vfsops->vfs_root == NULL)
/* return file system's root vnode */
vfsops->vfs_root = vfs_stdroot;
if (vfsops->vfs_quotactl == NULL)
/* quota control */
vfsops->vfs_quotactl = vfs_stdquotactl;
if (vfsops->vfs_statfs == NULL)
/* return file system's status */
vfsops->vfs_statfs = vfs_stdstatfs;
if (vfsops->vfs_sync == NULL)
/*
* flush unwritten data (nosync)
* file systems can use vfs_stdsync
* explicitly by setting it in the
* vfsop vector.
*/
vfsops->vfs_sync = vfs_stdnosync;
if (vfsops->vfs_vget == NULL)
/* convert an inode number to a vnode */
vfsops->vfs_vget = vfs_stdvget;
if (vfsops->vfs_fhtovp == NULL)
/* turn an NFS file handle into a vnode */
vfsops->vfs_fhtovp = vfs_stdfhtovp;
if (vfsops->vfs_checkexp == NULL)
/* check if file system is exported */
vfsops->vfs_checkexp = vfs_stdcheckexp;
if (vfsops->vfs_init == NULL)
/* file system specific initialisation */
vfsops->vfs_init = vfs_stdinit;
if (vfsops->vfs_uninit == NULL)
/* file system specific uninitialisation */
vfsops->vfs_uninit = vfs_stduninit;
if (vfsops->vfs_extattrctl == NULL)
/* extended attribute control */
vfsops->vfs_extattrctl = vfs_stdextattrctl;
do the vfsstd thing instead of messing up our VFS_SYSCTL macro.
2004-07-07 06:58:29 +00:00
if (vfsops->vfs_sysctl == NULL)
vfsops->vfs_sysctl = vfs_stdsysctl;
Make it easier for filesystems to count themselves as jail-enabled, by doing most of the work in a new function prison_add_vfs in kern_jail.c Now a jail-enabled filesystem need only mark itself with VFCF_JAIL, and the rest is taken care of. This includes adding a jail parameter like allow.mount.foofs, and a sysctl like security.jail.mount_foofs_allowed. Both of these used to be a static list of known filesystems, with predefined permission bits. Reviewed by: kib Differential Revision: D14681
2018-05-04 20:54:27 +00:00
Only call sigdeferstop() for NFS. Use bypass to catch any NFS VOP dispatch and route it through the wrapper which does sigdeferstop() and then dispatches original VOP. NFS does not need a bypass below it, which is not supported. The vop offset in the vop_vector is added since otherwise it is impossible to get vop_op_t from the internal table, and I did not wanted to create the layered fs only to wrap NFS VOPs. VFS_OP()s wrap is straightforward. Requested and reviewed by: mjg (previous version) Tested by: pho Sponsored by: The FreeBSD Foundation Differential revision: https://reviews.freebsd.org/D17658
2018-10-23 21:43:41 +00:00
if ((vfc->vfc_flags & VFCF_SBDRY) != 0) {
vfc->vfc_vfsops_sd = vfc->vfc_vfsops;
vfc->vfc_vfsops = &vfsops_sigdefer;
}
Make it easier for filesystems to count themselves as jail-enabled, by doing most of the work in a new function prison_add_vfs in kern_jail.c Now a jail-enabled filesystem need only mark itself with VFCF_JAIL, and the rest is taken care of. This includes adding a jail parameter like allow.mount.foofs, and a sysctl like security.jail.mount_foofs_allowed. Both of these used to be a static list of known filesystems, with predefined permission bits. Reviewed by: kib Differential Revision: D14681
2018-05-04 20:54:27 +00:00
if (vfc->vfc_flags & VFCF_JAIL)
prison_add_vfs(vfc);
*gulp*. Jordan specifically OK'ed this.. This is the bulk of the support for doing kld modules. Two linker_sets were replaced by SYSINIT()'s. VFS's and exec handlers are self registered. kld is now a superset of lkm. I have converted most of them, they will follow as a seperate commit as samples. This all still works as a static a.out kernel using LKM's.
1998-10-16 03:55:01 +00:00
/*
* Call init function for this VFS...
*/
Only call sigdeferstop() for NFS. Use bypass to catch any NFS VOP dispatch and route it through the wrapper which does sigdeferstop() and then dispatches original VOP. NFS does not need a bypass below it, which is not supported. The vop offset in the vop_vector is added since otherwise it is impossible to get vop_op_t from the internal table, and I did not wanted to create the layered fs only to wrap NFS VOPs. VFS_OP()s wrap is straightforward. Requested and reviewed by: mjg (previous version) Tested by: pho Sponsored by: The FreeBSD Foundation Differential revision: https://reviews.freebsd.org/D17658
2018-10-23 21:43:41 +00:00
if ((vfc->vfc_flags & VFCF_SBDRY) != 0)
vfc->vfc_vfsops_sd->vfs_init(vfc);
else
vfc->vfc_vfsops->vfs_init(vfc);
Remove Giant acquisition from the mount and unmount pathes. It could be claimed that two things were reasonable protected by Giant. One is vfsconf list links, which is converted to the new dedicated sx vfsconf_sx. Another is vfsconf.vfc_refcount, which is now updated with atomics. Note that vfc_refcount still has the same races now as it has under the Giant, the unload of filesystem modules can happen while the module is still in use. Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks
2014-08-03 03:27:54 +00:00
vfsconf_unlock();
*gulp*. Jordan specifically OK'ed this.. This is the bulk of the support for doing kld modules. Two linker_sets were replaced by SYSINIT()'s. VFS's and exec handlers are self registered. kld is now a superset of lkm. I have converted most of them, they will follow as a seperate commit as samples. This all still works as a static a.out kernel using LKM's.
1998-10-16 03:55:01 +00:00
Remove Giant acquisition from the mount and unmount pathes. It could be claimed that two things were reasonable protected by Giant. One is vfsconf list links, which is converted to the new dedicated sx vfsconf_sx. Another is vfsconf.vfc_refcount, which is now updated with atomics. Note that vfc_refcount still has the same races now as it has under the Giant, the unload of filesystem modules can happen while the module is still in use. Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks
2014-08-03 03:27:54 +00:00
/*
* If this filesystem has a sysctl node under vfs
* (i.e. vfs.xxfs), then change the oid number of that node to
* match the filesystem's type number. This allows user code
* which uses the type number to read sysctl variables defined
* by the filesystem to continue working. Since the oids are
* in a sorted list, we need to make sure the order is
* preserved by re-registering the oid after modifying its
* number.
*/
sysctl: switch sysctllock to a sleepable rmlock, take 2 This restores r285125. Previous attempt was reverted due to a bug in rmlocks, which is fixed since r287833.
2015-09-15 23:06:56 +00:00
sysctl_wlock();
Remove Giant acquisition from the mount and unmount pathes. It could be claimed that two things were reasonable protected by Giant. One is vfsconf list links, which is converted to the new dedicated sx vfsconf_sx. Another is vfsconf.vfc_refcount, which is now updated with atomics. Note that vfc_refcount still has the same races now as it has under the Giant, the unload of filesystem modules can happen while the module is still in use. Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks
2014-08-03 03:27:54 +00:00
SLIST_FOREACH(oidp, SYSCTL_CHILDREN(&sysctl___vfs), oid_link) {
if (strcmp(oidp->oid_name, vfc->vfc_name) == 0) {
sysctl_unregister_oid(oidp);
oidp->oid_number = vfc->vfc_typenum;
sysctl_register_oid(oidp);
break;
}
}
sysctl: switch sysctllock to a sleepable rmlock, take 2 This restores r285125. Previous attempt was reverted due to a bug in rmlocks, which is fixed since r287833.
2015-09-15 23:06:56 +00:00
sysctl_wunlock();
Remove Giant acquisition from the mount and unmount pathes. It could be claimed that two things were reasonable protected by Giant. One is vfsconf list links, which is converted to the new dedicated sx vfsconf_sx. Another is vfsconf.vfc_refcount, which is now updated with atomics. Note that vfc_refcount still has the same races now as it has under the Giant, the unload of filesystem modules can happen while the module is still in use. Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks
2014-08-03 03:27:54 +00:00
return (0);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
}
Implemented loadable VFS modules, and made most existing filesystems loadable. (NFS is a notable exception.)
1994-09-21 03:47:43 +00:00
*gulp*. Jordan specifically OK'ed this.. This is the bulk of the support for doing kld modules. Two linker_sets were replaced by SYSINIT()'s. VFS's and exec handlers are self registered. kld is now a superset of lkm. I have converted most of them, they will follow as a seperate commit as samples. This all still works as a static a.out kernel using LKM's.
1998-10-16 03:55:01 +00:00
More s/file system/filesystem/g
2002-05-16 21:28:32 +00:00
/* Remove registration of a filesystem type */
Make various mountpoint related functions static.
2005-02-10 12:25:38 +00:00
static int
Make the vnode opv vector construction fully dynamic. Previously we leaked memory on each unload and were limited to items referenced in the kernel copy of vnode_if.c. Now a kernel module is free to create it's own VOP_FOO() routines and the rest of the system will happily deal with it, including passthrough layers like union/umap/etc. Have VFS_SET() call a common vfs_modevent() handler rather than inline duplicating the common code all over the place. Have VNODEOP_SET() have the vnodeops removed at unload time (assuming a module) so that the vop_t ** vector is reclaimed. Slightly adjust the vop_t ** vectors so that calling slot 0 is a panic rather than a page fault. This could happen if VOP_something() was called without *any* handlers being present anywhere (including in vfs_default.c). slot 1 becomes the default vector for the vnodeop table. TODO: reclaim zones on unload (eg: nfs code)
1998-11-10 09:04:09 +00:00
vfs_unregister(struct vfsconf *vfc)
*gulp*. Jordan specifically OK'ed this.. This is the bulk of the support for doing kld modules. Two linker_sets were replaced by SYSINIT()'s. VFS's and exec handlers are self registered. kld is now a superset of lkm. I have converted most of them, they will follow as a seperate commit as samples. This all still works as a static a.out kernel using LKM's.
1998-10-16 03:55:01 +00:00
{
Convert the vfsconf list to a TAILQ. Introduce vfs_byname() function to find things on it. Staticize vfs_nmount() function under the name vfs_donmount(). Various cleanups.
2004-07-27 22:32:01 +00:00
struct vfsconf *vfsp;
Remove several write-only variables, all reported by the gcc 4.9 buildkernel run. Some of them were write-only under some kernel options, e.g. variables keeping values only used by CTR() macros. It costs nothing to the code readability and correctness to eliminate the warnings in those cases too by removing the local cached values used only for single-access. Review: https://reviews.freebsd.org/D2665 Reviewed by: rodrigc Looked at by: bjk Sponsored by: The FreeBSD Foundation MFC after: 1 week
2015-05-29 13:24:17 +00:00
int error, maxtypenum;
*gulp*. Jordan specifically OK'ed this.. This is the bulk of the support for doing kld modules. Two linker_sets were replaced by SYSINIT()'s. VFS's and exec handlers are self registered. kld is now a superset of lkm. I have converted most of them, they will follow as a seperate commit as samples. This all still works as a static a.out kernel using LKM's.
1998-10-16 03:55:01 +00:00
Remove Giant acquisition from the mount and unmount pathes. It could be claimed that two things were reasonable protected by Giant. One is vfsconf list links, which is converted to the new dedicated sx vfsconf_sx. Another is vfsconf.vfc_refcount, which is now updated with atomics. Note that vfc_refcount still has the same races now as it has under the Giant, the unload of filesystem modules can happen while the module is still in use. Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks
2014-08-03 03:27:54 +00:00
vfsconf_lock();
vfsp = vfs_byname_locked(vfc->vfc_name);
if (vfsp == NULL) {
vfsconf_unlock();
return (EINVAL);
}
if (vfsp->vfc_refcount != 0) {
vfsconf_unlock();
return (EBUSY);
}
Only call sigdeferstop() for NFS. Use bypass to catch any NFS VOP dispatch and route it through the wrapper which does sigdeferstop() and then dispatches original VOP. NFS does not need a bypass below it, which is not supported. The vop offset in the vop_vector is added since otherwise it is impossible to get vop_op_t from the internal table, and I did not wanted to create the layered fs only to wrap NFS VOPs. VFS_OP()s wrap is straightforward. Requested and reviewed by: mjg (previous version) Tested by: pho Sponsored by: The FreeBSD Foundation Differential revision: https://reviews.freebsd.org/D17658
2018-10-23 21:43:41 +00:00
error = 0;
if ((vfc->vfc_flags & VFCF_SBDRY) != 0) {
if (vfc->vfc_vfsops_sd->vfs_uninit != NULL)
error = vfc->vfc_vfsops_sd->vfs_uninit(vfsp);
} else {
if (vfc->vfc_vfsops->vfs_uninit != NULL) {
error = vfc->vfc_vfsops->vfs_uninit(vfsp);
}
if (error != 0) {
vfsconf_unlock();
return (error);
}
*gulp*. Jordan specifically OK'ed this.. This is the bulk of the support for doing kld modules. Two linker_sets were replaced by SYSINIT()'s. VFS's and exec handlers are self registered. kld is now a superset of lkm. I have converted most of them, they will follow as a seperate commit as samples. This all still works as a static a.out kernel using LKM's.
1998-10-16 03:55:01 +00:00
}
Convert the vfsconf list to a TAILQ. Introduce vfs_byname() function to find things on it. Staticize vfs_nmount() function under the name vfs_donmount(). Various cleanups.
2004-07-27 22:32:01 +00:00
TAILQ_REMOVE(&vfsconf, vfsp, vfc_list);
*gulp*. Jordan specifically OK'ed this.. This is the bulk of the support for doing kld modules. Two linker_sets were replaced by SYSINIT()'s. VFS's and exec handlers are self registered. kld is now a superset of lkm. I have converted most of them, they will follow as a seperate commit as samples. This all still works as a static a.out kernel using LKM's.
1998-10-16 03:55:01 +00:00
maxtypenum = VFS_GENERIC;
Convert the vfsconf list to a TAILQ. Introduce vfs_byname() function to find things on it. Staticize vfs_nmount() function under the name vfs_donmount(). Various cleanups.
2004-07-27 22:32:01 +00:00
TAILQ_FOREACH(vfsp, &vfsconf, vfc_list)
*gulp*. Jordan specifically OK'ed this.. This is the bulk of the support for doing kld modules. Two linker_sets were replaced by SYSINIT()'s. VFS's and exec handlers are self registered. kld is now a superset of lkm. I have converted most of them, they will follow as a seperate commit as samples. This all still works as a static a.out kernel using LKM's.
1998-10-16 03:55:01 +00:00
if (maxtypenum < vfsp->vfc_typenum)
maxtypenum = vfsp->vfc_typenum;
maxvfsconf = maxtypenum + 1;
Remove Giant acquisition from the mount and unmount pathes. It could be claimed that two things were reasonable protected by Giant. One is vfsconf list links, which is converted to the new dedicated sx vfsconf_sx. Another is vfsconf.vfc_refcount, which is now updated with atomics. Note that vfc_refcount still has the same races now as it has under the Giant, the unload of filesystem modules can happen while the module is still in use. Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks
2014-08-03 03:27:54 +00:00
vfsconf_unlock();
return (0);
*gulp*. Jordan specifically OK'ed this.. This is the bulk of the support for doing kld modules. Two linker_sets were replaced by SYSINIT()'s. VFS's and exec handlers are self registered. kld is now a superset of lkm. I have converted most of them, they will follow as a seperate commit as samples. This all still works as a static a.out kernel using LKM's.
1998-10-16 03:55:01 +00:00
}
Make the vnode opv vector construction fully dynamic. Previously we leaked memory on each unload and were limited to items referenced in the kernel copy of vnode_if.c. Now a kernel module is free to create it's own VOP_FOO() routines and the rest of the system will happily deal with it, including passthrough layers like union/umap/etc. Have VFS_SET() call a common vfs_modevent() handler rather than inline duplicating the common code all over the place. Have VNODEOP_SET() have the vnodeops removed at unload time (assuming a module) so that the vop_t ** vector is reclaimed. Slightly adjust the vop_t ** vectors so that calling slot 0 is a panic rather than a page fault. This could happen if VOP_something() was called without *any* handlers being present anywhere (including in vfs_default.c). slot 1 becomes the default vector for the vnodeop table. TODO: reclaim zones on unload (eg: nfs code)
1998-11-10 09:04:09 +00:00
Document all functions, global and static variables, and sysctls. Includes some minor whitespace changes, and re-ordering to be able to document properly (e.g, grouping of variables and the SYSCTL macro calls for them, where the documentation has been added.) Reviewed by: phk (but all errors are mine)
2002-03-05 15:38:49 +00:00
/*
More s/file system/filesystem/g
2002-05-16 21:28:32 +00:00
* Standard kernel module handling code for filesystem modules.
Document all functions, global and static variables, and sysctls. Includes some minor whitespace changes, and re-ordering to be able to document properly (e.g, grouping of variables and the SYSCTL macro calls for them, where the documentation has been added.) Reviewed by: phk (but all errors are mine)
2002-03-05 15:38:49 +00:00
* Referenced from VFS_SET().
*/
Make the vnode opv vector construction fully dynamic. Previously we leaked memory on each unload and were limited to items referenced in the kernel copy of vnode_if.c. Now a kernel module is free to create it's own VOP_FOO() routines and the rest of the system will happily deal with it, including passthrough layers like union/umap/etc. Have VFS_SET() call a common vfs_modevent() handler rather than inline duplicating the common code all over the place. Have VNODEOP_SET() have the vnodeops removed at unload time (assuming a module) so that the vop_t ** vector is reclaimed. Slightly adjust the vop_t ** vectors so that calling slot 0 is a panic rather than a page fault. This could happen if VOP_something() was called without *any* handlers being present anywhere (including in vfs_default.c). slot 1 becomes the default vector for the vnodeop table. TODO: reclaim zones on unload (eg: nfs code)
1998-11-10 09:04:09 +00:00
int
Fixed the type of vfs_modevent (a little late, to match the corresponding change in sys/mount.h).
1998-11-15 15:18:30 +00:00
vfs_modevent(module_t mod, int type, void *data)
Make the vnode opv vector construction fully dynamic. Previously we leaked memory on each unload and were limited to items referenced in the kernel copy of vnode_if.c. Now a kernel module is free to create it's own VOP_FOO() routines and the rest of the system will happily deal with it, including passthrough layers like union/umap/etc. Have VFS_SET() call a common vfs_modevent() handler rather than inline duplicating the common code all over the place. Have VNODEOP_SET() have the vnodeops removed at unload time (assuming a module) so that the vop_t ** vector is reclaimed. Slightly adjust the vop_t ** vectors so that calling slot 0 is a panic rather than a page fault. This could happen if VOP_something() was called without *any* handlers being present anywhere (including in vfs_default.c). slot 1 becomes the default vector for the vnodeop table. TODO: reclaim zones on unload (eg: nfs code)
1998-11-10 09:04:09 +00:00
{
struct vfsconf *vfc;
int error = 0;
vfc = (struct vfsconf *)data;
switch (type) {
case MOD_LOAD:
if (vfc)
error = vfs_register(vfc);
break;
case MOD_UNLOAD:
if (vfc)
error = vfs_unregister(vfc);
break;
Do a pass over all modules in the kernel and make them return EOPNOTSUPP for unknown events. A number of modules return EINVAL in this instance, and I have left those alone for now and instead taught MOD_QUIESCE to accept this as "didn't do anything".
2004-07-15 08:26:07 +00:00
default:
error = EOPNOTSUPP;
Make the vnode opv vector construction fully dynamic. Previously we leaked memory on each unload and were limited to items referenced in the kernel copy of vnode_if.c. Now a kernel module is free to create it's own VOP_FOO() routines and the rest of the system will happily deal with it, including passthrough layers like union/umap/etc. Have VFS_SET() call a common vfs_modevent() handler rather than inline duplicating the common code all over the place. Have VNODEOP_SET() have the vnodeops removed at unload time (assuming a module) so that the vop_t ** vector is reclaimed. Slightly adjust the vop_t ** vectors so that calling slot 0 is a panic rather than a page fault. This could happen if VOP_something() was called without *any* handlers being present anywhere (including in vfs_default.c). slot 1 becomes the default vector for the vnodeop table. TODO: reclaim zones on unload (eg: nfs code)
1998-11-10 09:04:09 +00:00
break;
}
return (error);
}
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