+++ /dev/null
-/*
- * This Cplant(TM) source code is the property of Sandia National
- * Laboratories.
- *
- * This Cplant(TM) source code is copyrighted by Sandia National
- * Laboratories.
- *
- * The redistribution of this Cplant(TM) source code is subject to the
- * terms of the GNU Lesser General Public License
- * (see cit/LGPL or http://www.gnu.org/licenses/lgpl.html)
- *
- * Cplant(TM) Copyright 1998-2004 Sandia Corporation.
- * Under the terms of Contract DE-AC04-94AL85000, there is a non-exclusive
- * license for use of this work by or on behalf of the US Government.
- * Export of this program may require a license from the United States
- * Government.
- */
-
-/*
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * Questions or comments about this library should be sent to:
- *
- * Lee Ward
- * Sandia National Laboratories, New Mexico
- * P.O. Box 5800
- * Albuquerque, NM 87185-1110
- *
- * lee@sandia.gov
- */
-
-#include <stdlib.h>
-#include <string.h>
-#include <errno.h>
-#include <assert.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#ifdef AUTOMOUNT_FILE_NAME
-#include <fcntl.h>
-#include <sys/uio.h>
-#endif
-#include <sys/queue.h>
-
-#include "sysio.h"
-#include "xtio.h"
-#include "fs.h"
-#include "mount.h"
-#include "inode.h"
-
-/*
- * File system and volume mount support.
- */
-
-#ifdef AUTOMOUNT_FILE_NAME
-/*
- * Name of autmount specification file in a directory with
- * the sticky-bit set.
- */
-struct qstr _sysio_mount_file_name = { "", 0, 0 };
-#endif
-
-/*
- * Active mounts.
- */
-static LIST_HEAD(, mount) mounts;
-
-static int _sysio_sub_fsswop_mount(const char *source,
- unsigned flags,
- const void *data,
- struct pnode *tocover,
- struct mount **mntp);
-
-static struct fssw_ops _sysio_sub_fssw_ops = {
- _sysio_sub_fsswop_mount
-};
-
-/*
- * Initialization. Must be called before any other routine in this module.
- */
-int
-_sysio_mount_init()
-{
- int err;
-
- LIST_INIT(&mounts);
-#ifdef AUTOMOUNT_FILE_NAME
- _sysio_next_component(AUTOMOUNT_FILE_NAME, &_sysio_mount_file_name);
-#endif
-
- /*
- * Register the sub-trees "file system" driver.
- */
- err = _sysio_fssw_register("sub", &_sysio_sub_fssw_ops);
- if (err)
- return err;
-
- return 0;
-}
-
-/*
- * Mount rooted sub-tree somewhere in the existing name space.
- */
-int
-_sysio_do_mount(struct filesys *fs,
- struct pnode_base *rootpb,
- unsigned flags,
- struct pnode *tocover,
- struct mount **mntp)
-{
- struct mount *mnt;
- int err;
-
- /*
- * It's really poor form to allow the new root to be a
- * descendant of the pnode being covered.
- */
- if (tocover) {
- struct pnode_base *pb;
-
- for (pb = rootpb;
- pb && pb != tocover->p_base;
- pb = pb->pb_parent)
- ;
- if (pb == tocover->p_base)
- return -EBUSY;
- }
-
- /*
- * Alloc
- */
- mnt = malloc(sizeof(struct mount));
- if (!mnt)
- return -ENOMEM;
- err = 0;
- /*
- * Init enough to make the mount record usable to the path node
- * generation routines.
- */
- mnt->mnt_fs = fs;
- if (fs->fs_flags & FS_F_RO) {
- /*
- * Propagate the read-only flag -- Whether they set it or not.
- */
- flags |= MOUNT_F_RO;
- }
- mnt->mnt_flags = flags;
- /*
- * Get alias for the new root.
- */
- mnt->mnt_root =
- _sysio_p_new_alias(tocover ? tocover->p_parent : NULL, rootpb, mnt);
- if (!mnt->mnt_root) {
- err = -ENOMEM;
- goto error;
- }
- /*
- * It may have been a while since the root inode was validated;
- * better validate again. And it better be a directory!
- */
- err = _sysio_p_validate(mnt->mnt_root, NULL, NULL);
- if (err)
- goto error;
-
- if (!S_ISDIR(mnt->mnt_root->p_base->pb_ino->i_stbuf.st_mode)) {
- err = -ENOTDIR;
- goto error;
- }
- /*
- * Cover up the mount point.
- */
- mnt->mnt_covers = tocover;
- if (!mnt->mnt_covers) {
- /*
- * New graph; It covers itself.
- */
- mnt->mnt_covers = tocover = mnt->mnt_root;
- }
- assert(!tocover->p_cover);
- tocover->p_cover = mnt->mnt_root;
-
- LIST_INSERT_HEAD(&mounts, mnt, mnt_link);
-
- *mntp = mnt;
- return 0;
-
-error:
- if (mnt->mnt_root) {
- P_RELE(mnt->mnt_root);
- _sysio_p_prune(mnt->mnt_root);
- }
- free(mnt);
- return err;
-}
-
-/*
- * Remove mounted sub-tree from the system.
- */
-int
-_sysio_do_unmount(struct mount *mnt)
-{
- struct pnode *root;
- struct filesys *fs;
-
- root = mnt->mnt_root;
- if (root->p_cover && root->p_cover != root) {
- /*
- * Active mount.
- */
- return -EBUSY;
- }
- assert(mnt->mnt_covers->p_cover == root);
- if (_sysio_p_prune(root) != 1) {
- /*
- * Active aliases.
- */
- return -EBUSY;
- }
- /*
- * We're committed.
- *
- * Drop ref of covered pnode and break linkage in name space.
- */
- if (root->p_cover != root)
- P_RELE(mnt->mnt_covers);
- mnt->mnt_covers->p_cover = NULL;
- LIST_REMOVE(mnt, mnt_link);
- /*
- * Kill the root.
- */
- P_RELE(root);
- root->p_cover = NULL;
- _sysio_p_gone(root);
- /*
- * Release mount record resource.
- */
- fs = mnt->mnt_fs;
- free(mnt);
- FS_RELE(fs);
-
- return 0;
-}
-
-/*
- * Establish the system name space.
- */
-int
-_sysio_mount_root(const char *source,
- const char *fstype,
- unsigned flags,
- const void *data)
-{
- struct fsswent *fssw;
- int err;
- struct mount *mnt;
-
- if (_sysio_root)
- return -EBUSY;
-
- fssw = _sysio_fssw_lookup(fstype);
- if (!fssw)
- return -ENODEV;
-
- err = (*fssw->fssw_ops.fsswop_mount)(source, flags, data, NULL, &mnt);
- if (err)
- return err;
-
- _sysio_root = mnt->mnt_root;
-#ifndef DEFER_INIT_CWD
- /*
- * It is very annoying to have to set the current working directory.
- * So... If it isn't set, make it the root now.
- */
- if (!_sysio_cwd) {
- _sysio_cwd = _sysio_root;
- P_REF(_sysio_cwd);
- }
-#endif
-
- return 0;
-}
-
-int
-_sysio_mount(struct pnode *cwd,
- const char *source,
- const char *target,
- const char *filesystemtype,
- unsigned long mountflags,
- const void *data)
-{
- int err;
- struct fsswent *fssw;
- struct intent intent;
- struct pnode *tgt;
- struct mount *mnt;
-
- /*
- * Find the file system switch entry specified.
- */
- fssw = _sysio_fssw_lookup(filesystemtype);
- if (!fssw)
- return -ENODEV;
-
- /*
- * Look up the target path node.
- */
- INTENT_INIT(&intent, INT_GETATTR, NULL, NULL);
- err = _sysio_namei(cwd, target, 0, &intent, &tgt);
- if (err)
- return err;
-
- if (tgt == _sysio_root) {
- /*
- * Attempting to mount over root.
- */
- err = -EBUSY;
- } else {
- /*
- * Do the deed.
- */
- err =
- (*fssw->fssw_ops.fsswop_mount)(source,
- mountflags,
- data,
- tgt,
- &mnt);
- }
- if (err)
- P_RELE(tgt);
- return err;
-}
-
-int
-SYSIO_INTERFACE_NAME(mount)(const char *source,
- const char *target,
- const char *filesystemtype,
- unsigned long mountflags,
- const void *data)
-{
- int err;
- SYSIO_INTERFACE_DISPLAY_BLOCK;
-
- SYSIO_INTERFACE_ENTER;
- err =
- _sysio_mount(_sysio_cwd,
- source,
- target,
- filesystemtype,
- mountflags,
- data);
- SYSIO_INTERFACE_RETURN(err ? -1 : 0, err);
-}
-
-int
-SYSIO_INTERFACE_NAME(umount)(const char *target)
-{
- int err;
- struct pnode *pno;
- SYSIO_INTERFACE_DISPLAY_BLOCK;
-
- SYSIO_INTERFACE_ENTER;
- /*
- * Look up the target path node.
- */
- err = _sysio_namei(_sysio_cwd, target, 0, NULL, &pno);
- if (err)
- goto out;
- P_RELE(pno); /* was ref'd */
-
- /*
- * Do the deed.
- */
-#if 0
- if (!pno->p_cover) {
- err = -EINVAL;
- goto error;
- }
-#endif
- assert(pno->p_mount);
- err = _sysio_do_unmount(pno->p_mount);
-
-out:
- SYSIO_INTERFACE_RETURN(err ? -1 : 0, err);
-}
-
-/*
- * Unmount all file systems -- Usually as part of shutting everything down.
- */
-int
-_sysio_unmount_all()
-{
- int err;
- struct mount *mnt, *nxt;
- struct pnode *pno;
-
- err = 0;
- nxt = mounts.lh_first;
- while ((mnt = nxt)) {
- nxt = mnt->mnt_link.le_next;
- pno = mnt->mnt_root;
- /*
- * If this is an automount generated mount, the root
- * has no reference. We can cause the dismount with a
- * simple prune.
- */
- if (!_sysio_p_prune(pno))
- continue;
-#ifdef notdef
- /*
- * Need a ref but only if this is not the root of a
- * disconnected graph. If it is, then it is covered by itself
- * and, so, already referenced.
- */
- if (pno->p_cover != pno)
- P_REF(pno);
-#endif
- err = _sysio_do_unmount(mnt);
- if (err) {
-#ifdef notdef
- if (pno->p_cover != pno)
- P_RELE(pno);
-#endif
- break;
- }
- if (pno == _sysio_root)
- _sysio_root = NULL;
- }
-
- return err;
-}
-
-static int
-_sysio_sub_fsswop_mount(const char *source,
- unsigned flags,
- const void *data __IS_UNUSED,
- struct pnode *tocover,
- struct mount **mntp)
-{
- int err;
- struct nameidata nameidata;
- struct mount *mnt;
-
- /*
- * How can we make a sub-mount from nothing?
- */
- if (!_sysio_root)
- return -EBUSY;
-
- /*
- * Lookup the source.
- */
- ND_INIT(&nameidata, 0, source, _sysio_root, NULL);
- err = _sysio_path_walk(_sysio_root, &nameidata);
- if (err)
- return err;
-
- /*
- * Mount the rooted sub-tree at the given position.
- */
- err =
- _sysio_do_mount(nameidata.nd_pno->p_mount->mnt_fs,
- nameidata.nd_pno->p_base,
- nameidata.nd_pno->p_mount->mnt_flags & flags,
- tocover,
- &mnt);
-
- /*
- * Clean up and return.
- */
- if (!err) {
- FS_REF(nameidata.nd_pno->p_mount->mnt_fs);
- *mntp = mnt;
- }
- P_RELE(nameidata.nd_pno);
- return err;
-}
-
-#ifdef AUTOMOUNT_FILE_NAME
-/*
- * Parse automount specification formatted as:
- *
- * <fstype>:<source>[[ \t]+<comma-separated-mount-options>]
- *
- * NB:
- * The buffer sent is (almost) always modified.
- */
-static int
-parse_automount_spec(char *s, char **fstyp, char **srcp, char **optsp)
-{
- int err;
- char *cp;
- char *fsty, *src, *opts;
-
- err = 0;
-
- /*
- * Eat leading white.
- */
- while (*s && *s == ' ' && *s == '\t')
- s++;
- /*
- * Get fstype.
- */
- fsty = cp = s;
- while (*cp &&
- *cp != ':' &&
- *cp != ' ' &&
- *cp != '\t' &&
- *cp != '\r' &&
- *cp != '\n')
- cp++;
- if (fsty == cp || *cp != ':')
- goto error;
- *cp++ = '\0';
-
- s = cp;
- /*
- * Eat leading white.
- */
- while (*s && *s == ' ' && *s == '\t')
- s++;
- /*
- * Get source.
- */
- src = cp = s;
- while (*cp &&
- *cp != ' ' &&
- *cp != '\t' &&
- *cp != '\r' &&
- *cp != '\n')
- cp++;
- if (src == cp)
- goto error;
- if (*cp)
- *cp++ = '\0';
-
- s = cp;
- /*
- * Eat leading white.
- */
- while (*s && *s == ' ' && *s == '\t')
- s++;
- /*
- * Get opts.
- */
- opts = cp = s;
- while (*cp &&
- *cp != ' ' &&
- *cp != '\t' &&
- *cp != '\r' &&
- *cp != '\n')
- cp++;
- if (opts == cp)
- opts = NULL;
- if (*cp)
- *cp++ = '\0';
-
- if (*cp)
- goto error;
-
- *fstyp = fsty;
- *srcp = src;
- *optsp = opts;
- return 0;
-
-error:
- return -EINVAL;
-}
-
-/*
- * Parse (and strip) system mount options.
- */
-static char *
-parse_opts(char *opts, unsigned *flagsp)
-{
- unsigned flags;
- char *src, *dst;
- char *cp;
-
- flags = 0;
- src = dst = opts;
- for (;;) {
- cp = src;
- while (*cp && *cp != ',')
- cp++;
- if (src + 2 == cp && strncmp(src, "rw", 2) == 0) {
- /*
- * Do nothing. This is the default.
- */
- src += 2;
- } else if (src + 2 == cp && strncmp(src, "ro", 2) == 0) {
- /*
- * Read-only.
- */
- flags |= MOUNT_F_RO;
- src += 2;
- }
- else if (src + 4 == cp && strncmp(src, "auto", 4) == 0) {
- /*
- * Enable automounts.
- */
- flags |= MOUNT_F_AUTO;
- src += 4;
- }
- if (src < cp) {
- /*
- * Copy what we didn't consume.
- */
- if (dst != opts)
- *dst++ = ',';
- do
- *dst++ = *src++;
- while (src != cp);
- }
- if (!*src)
- break;
- *dst = '\0';
- src++; /* skip comma */
- }
- *dst = '\0';
-
- *flagsp = flags;
- return opts;
-}
-
-/*
- * Attempt automount over the given directory.
- */
-int
-_sysio_automount(struct pnode *mntpno)
-{
- int err;
- struct inode *ino;
- struct iovec iovec;
- struct ioctx iocontext;
- struct intnl_xtvec xtvec;
- ssize_t cc;
- char *fstype, *source, *opts;
- unsigned flags;
- struct fsswent *fssw;
- struct mount *mnt;
-
- /*
- * Revalidate -- Paranoia.
- */
- err = _sysio_p_validate(mntpno, NULL, NULL);
- if (err)
- return err;
-
- /*
- * Read file content.
- */
- ino = mntpno->p_base->pb_ino;
- if (ino->i_stbuf.st_size > 64 * 1024) {
- /*
- * Let's be reasonable.
- */
- return -EINVAL;
- }
- iovec.iov_base = malloc(ino->i_stbuf.st_size + 1);
- if (!iovec.iov_base)
- return -ENOMEM;
- iovec.iov_len = ino->i_stbuf.st_size;
- err = _sysio_open(mntpno, O_RDONLY, 0);
- if (err)
- goto out;
- xtvec.xtv_off = 0;
- xtvec.xtv_len = ino->i_stbuf.st_size;
- IOCTX_INIT(&iocontext,
- 1,
- 0,
- ino,
- &iovec, 1,
- &xtvec, 1);
- _sysio_ioctx_enter(&iocontext);
- err = (*ino->i_ops.inop_read)(ino, &iocontext);
- if (err) {
- _sysio_ioctx_complete(&iocontext);
- (void )(*ino->i_ops.inop_close)(ino);
- goto out;
- }
- cc = _sysio_ioctx_wait(&iocontext);
- err = (*ino->i_ops.inop_close)(ino);
- if (err)
- goto out;
- if (cc < 0) {
- err = (int )cc;
- goto out;
- }
- ((char *)iovec.iov_base)[cc] = '\0';
-
- /*
- * Parse.
- */
- err = parse_automount_spec(iovec.iov_base, &fstype, &source, &opts);
- if (err)
- goto out;
- flags = 0;
- if (opts)
- opts = parse_opts(opts, &flags);
-
- /*
- * Find the file system switch entry specified.
- */
- fssw = _sysio_fssw_lookup(fstype);
- if (!fssw) {
- err = -ENODEV;
- goto out;
- }
-
- /*
- * Do the deed.
- */
- P_REF(mntpno->p_parent);
- err =
- (*fssw->fssw_ops.fsswop_mount)(source,
- flags,
- opts,
- mntpno->p_parent,
- &mnt);
- if (err)
- P_RELE(mntpno->p_parent);
-
-out:
- if (iovec.iov_base)
- free(iovec.iov_base);
- return err;
-}
-#endif
git://git.whamcloud.com / fs / lustre-release.git / blobdiff