/*===========================================================================*
* verify_dentry *
*===========================================================================*/
int verify_dentry(
struct inode *parent, /* parent inode: the inode to verify */
char name[NAME_MAX+1], /* the given directory entry path component */
char path[PATH_MAX], /* buffer to store the resulting path in */
struct inode **res_ino /* pointer for addressed inode (or NULL) */
)
{
/* Given a directory inode and a name, construct a path identifying that
* directory entry, check whether the path to the parent is still valid, and
* check whether there is an inode pointed to by the full path. Upon success,
* res_ino will contain either the inode for the full path, with increased
* refcount, or NULL if no such inode exists.
*/
int r;
if ((r = verify_inode(parent, path, NULL)) != OK)
return r;
dprintf(("%s: verify_dentry: given path is '%s', name '%s'\n",
sffs_name, path, name));
if ((r = push_path(path, name)) != OK)
return r;
dprintf(("%s: verify_dentry: path now '%s'\n", sffs_name, path));
*res_ino = lookup_dentry(parent, name);
return OK;
}
static struct dentry *snd_info_card_followlink(struct dentry *dentry,
struct dentry *base,
unsigned int follow)
{
char *s = ((struct proc_dir_entry *) dentry->d_inode->u.generic_ip)->data;
return lookup_dentry(s, base, follow);
}
static struct dentry * autofs_follow_link(struct dentry *dentry,
struct dentry *base,
unsigned int follow)
{
struct autofs_symlink *sl;
sl = (struct autofs_symlink *)dentry->d_inode->u.generic_ip;
return lookup_dentry(sl->data, base, follow);
}
/*===========================================================================*
* go_down *
*===========================================================================*/
static int go_down(
char path[PATH_MAX], /* path to add the name to */
struct inode *parent, /* inode of the current directory */
char *name, /* name of the directory entry */
struct inode **res_ino, /* place to store resulting inode */
struct sffs_attr *attr /* place to store inode attributes */
)
{
/* Given a directory inode and a name, progress into a directory entry.
*/
struct inode *ino;
int r, stale = 0;
if ((r = push_path(path, name)) != OK)
return r;
dprintf(("%s: go_down: name '%s', path now '%s'\n", sffs_name, name, path));
ino = lookup_dentry(parent, name);
dprintf(("%s: lookup_dentry('%s') returned %p\n", sffs_name, name, ino));
if (ino != NULL)
r = verify_path(path, ino, attr, &stale);
else
r = sffs_table->t_getattr(path, attr);
dprintf(("%s: path query returned %d\n", sffs_name, r));
if (r != OK) {
if (ino != NULL) {
put_inode(ino);
ino = NULL;
}
if (!stale)
return r;
}
dprintf(("%s: name '%s'\n", sffs_name, name));
if (ino == NULL) {
if ((ino = get_free_inode()) == NULL)
return ENFILE;
dprintf(("%s: inode %p ref %d\n", sffs_name, ino, ino->i_ref));
ino->i_flags = MODE_TO_DIRFLAG(attr->a_mode);
add_dentry(parent, name, ino);
}
*res_ino = ino;
return OK;
}
static struct dentry *devtree_follow_link(struct dentry *dentry,
struct dentry *base,
unsigned int follow)
{
struct inode *inode = dentry->d_inode;
struct proc_dir_entry * de;
char *link;
de = (struct proc_dir_entry *) inode->u.generic_ip;
link = (char *) de->data;
return lookup_dentry(link, base, follow);
}
static struct dentry *efs_follow_link(struct dentry *dentry, struct dentry *base, unsigned int follow) {
char *name;
struct inode *inode = dentry->d_inode;
if (!(name = efs_linktarget(inode, NULL))) {
dput(base);
return ERR_PTR(-ELOOP);
}
base = lookup_dentry(name, base, follow);
kfree(name);
return base;
}
static struct dentry *ncp_follow_link(struct dentry *dentry,
struct dentry *base,
unsigned int follow)
{
struct inode *inode=dentry->d_inode;
int error, length, cnt;
char *link;
#ifdef DEBUG
printk("ncp_follow_link(dentry=%p,base=%p,follow=%u)\n",dentry,base,follow);
#endif
if(!S_ISLNK(inode->i_mode)) {
dput(base);
return ERR_PTR(-EINVAL);
}
if(ncp_make_open(inode,O_RDONLY)) {
dput(base);
return ERR_PTR(-EIO);
}
for (cnt = 0; (link=(char *)kmalloc(NCP_MAX_SYMLINK_SIZE+1, GFP_NFS))==NULL; cnt++) {
if (cnt > 10) {
dput(base);
return ERR_PTR(-EAGAIN); /* -ENOMEM? */
}
schedule();
}
error=ncp_read_kernel(NCP_SERVER(inode),NCP_FINFO(inode)->file_handle,
0,NCP_MAX_SYMLINK_SIZE,link,&length);
if (error!=0 || length<NCP_MIN_SYMLINK_SIZE ||
((__u32 *)link)[0]!=NCP_SYMLINK_MAGIC0 || ((__u32 *)link)[1]!=NCP_SYMLINK_MAGIC1) {
dput(base);
kfree(link);
return ERR_PTR(-EIO);
}
link[length]=0;
vol2io(NCP_SERVER(inode), link+8, 0);
/* UPDATE_ATIME(inode); */
base=lookup_dentry(link+8, base, follow);
kfree(link);
return base;
}
static struct dir_entry *path_to_dentry(struct vmm_blockdev *mdev,
const char *path,
struct dir_entry *pdentry)
{
char dirname[VFS_MAX_NAME] = { 0 };
struct dir_entry *dentry, *d_root;
int i = 0, rd;
int len = 0;
char rpath[VFS_MAX_NAME];
len = strlen(path);
if (!len) return NULL;
vmm_snprintf(rpath, len, "%s", path);
if (rpath[len - 1] != '/') {
rpath[len] = '/';
rpath[len+1] = 0;
}
path = rpath;
if (*path == '/') {
path++;
if (!*path) return pdentry;
}
while (*path && *path != '/') {
dirname[i] = *path;
path++;
i++;
}
dentry = lookup_dentry(dirname, pdentry);
if (dentry) {
d_root = vmm_zalloc(dentry->dlen.lsb);
rd = vmm_blockdev_read(mdev, (u8 *)d_root,
(dentry->start_lba.lsb * 2048),
dentry->dlen.lsb);
if (rd != dentry->dlen.lsb) {
vmm_free(d_root);
return NULL;
}
dentry = path_to_dentry(mdev, path, d_root);
}
return dentry;
}
static struct dentry *qnx4_follow_link(struct dentry *dentry,
struct dentry *base, unsigned int follow)
{
struct inode *inode = dentry->d_inode;
struct buffer_head *bh;
if ( !inode ) {
return ERR_PTR(-ENOENT);
}
if ( !( bh = qnx4_bread( inode, 0, 0 ) ) ) {
dput( base );
return ERR_PTR(-EIO);
}
UPDATE_ATIME( inode );
base = lookup_dentry( bh->b_data, base, follow );
brelse( bh );
return base;
}
void devfs_init(void)
{
int mode;
/* Make sure there is a dev directory */
struct dentry *dentry = lookup_dentry("/dev/", 0);
if (!dentry) {
assert(!do_mkdir("/dev/", S_IRWXU | S_IRWXG | S_IRWXO));
} else {
kref_put(&dentry->d_kref);
}
/* Notice we don't kref_put(). We're storing the refs globally */
dev_stdin = make_device("/dev/stdin", S_IRUSR | S_IRGRP | S_IROTH,
__S_IFCHR, &dev_f_op_stdin);
dev_stdout = make_device("/dev/stdout", S_IWUSR | S_IWGRP | S_IWOTH,
__S_IFCHR, &dev_f_op_stdout);
/* Note stderr uses the same f_op as stdout */
dev_stderr = make_device("/dev/stderr", S_IWUSR | S_IWGRP | S_IWOTH,
__S_IFCHR, &dev_f_op_stdout);
dev_null = make_device("/dev/null", S_IWUSR | S_IWGRP | S_IWOTH,
__S_IFCHR, &dev_f_op_null);
}
int
osi_lookupname(char *aname, uio_seg_t seg, int followlink, struct dentry **dpp)
{
struct dentry *dp = NULL;
int code;
code = ENOENT;
if (seg == AFS_UIOUSER) {
dp = followlink ? namei(aname) : lnamei(aname);
} else {
dp = lookup_dentry(aname, NULL, followlink ? 1 : 0);
}
if (dp && !IS_ERR(dp)) {
if (dp->d_inode) {
*dpp = dp;
code = 0;
} else
dput(dp);
}
return code;
}
/*
* Look up one component of a pathname.
* N.B. After this call _both_ fhp and resfh need an fh_put
*/
int
nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name,
int len, struct svc_fh *resfh)
{
struct svc_export *exp;
struct dentry *dparent, *dchild;
int err;
dprintk("nfsd: nfsd_lookup(fh %p, %s)\n", SVCFH_DENTRY(fhp), name);
/* Obtain dentry and export. */
err = fh_verify(rqstp, fhp, S_IFDIR, MAY_EXEC);
if (err)
goto out;
dparent = fhp->fh_dentry;
exp = fhp->fh_export;
#if 0
err = nfsd_permission(exp, dparent, MAY_EXEC);
if (err)
goto out;
#endif
err = nfserr_noent;
if (fs_off_limits(dparent->d_sb))
goto out;
err = nfserr_acces;
if (nfsd_iscovered(dparent, exp))
goto out;
/* Lookup the name, but don't follow links */
dchild = lookup_dentry(name, dget(dparent), 0);
if (IS_ERR(dchild))
goto out_nfserr;
/*
* check if we have crossed a mount point ...
*/
if (dchild->d_sb != dparent->d_sb) {
struct dentry *tdentry;
tdentry = dchild->d_covers;
if (tdentry == dchild)
goto out_dput;
dput(dchild);
dchild = dget(tdentry);
if (dchild->d_sb != dparent->d_sb) {
printk("nfsd_lookup: %s/%s crossed mount point!\n", dparent->d_name.name, dchild->d_name.name);
goto out_dput;
}
}
/*
* Note: we compose the file handle now, but as the
* dentry may be negative, it may need to be updated.
*/
fh_compose(resfh, exp, dchild);
err = nfserr_noent;
if (dchild->d_inode)
err = 0;
out:
return err;
out_nfserr:
err = nfserrno(-PTR_ERR(dchild));
goto out;
out_dput:
dput(dchild);
err = nfserr_acces;
goto out;
}
int __init change_root(kdev_t new_root_dev,const char *put_old)
{
kdev_t old_root_dev;
struct vfsmount *vfsmnt;
struct dentry *old_root,*old_pwd,*dir_d = NULL;
int error;
old_root = current->fs->root;
old_pwd = current->fs->pwd;
old_root_dev = ROOT_DEV;
if (!fs_may_mount(new_root_dev)) {
printk(KERN_CRIT "New root is busy. Staying in initrd.\n");
return -EBUSY;
}
ROOT_DEV = new_root_dev;
mount_root();
dput(old_root);
dput(old_pwd);
#if 1
shrink_dcache();
printk("change_root: old root has d_count=%d\n", old_root->d_count);
#endif
/*
* Get the new mount directory
*/
dir_d = lookup_dentry(put_old, NULL, 1);
if (IS_ERR(dir_d)) {
error = PTR_ERR(dir_d);
} else if (!dir_d->d_inode) {
dput(dir_d);
error = -ENOENT;
} else {
error = 0;
}
if (!error && dir_d->d_covers != dir_d) {
dput(dir_d);
error = -EBUSY;
}
if (!error && !S_ISDIR(dir_d->d_inode->i_mode)) {
dput(dir_d);
error = -ENOTDIR;
}
if (error) {
int umount_error;
printk(KERN_NOTICE "Trying to unmount old root ... ");
umount_error = do_umount(old_root_dev,1, 0);
if (!umount_error) {
printk("okay\n");
/* special: the old device driver is going to be
a ramdisk and the point of this call is to free its
protected memory (even if dirty). */
destroy_buffers(old_root_dev);
return 0;
}
printk(KERN_ERR "error %d\n",umount_error);
return error;
}
remove_vfsmnt(old_root_dev);
vfsmnt = add_vfsmnt(old_root->d_sb, "/dev/root.old", put_old);
if (vfsmnt) {
d_mount(dir_d,old_root);
return 0;
}
printk(KERN_CRIT "Trouble: add_vfsmnt failed\n");
return -ENOMEM;
}
/*===========================================================================*
* do_getdents *
*===========================================================================*/
int do_getdents()
{
/* Retrieve directory entries.
*/
char name[NAME_MAX+1];
struct inode *ino, *child;
struct dirent *dent;
struct sffs_attr attr;
size_t len, off, user_off, user_left;
off_t pos;
int r;
/* must be at least sizeof(struct dirent) + NAME_MAX */
static char buf[BLOCK_SIZE];
attr.a_mask = SFFS_ATTR_MODE;
if ((ino = find_inode(m_in.REQ_INODE_NR)) == NULL)
return EINVAL;
if (m_in.REQ_SEEK_POS_HI != 0) return EINVAL;
if (!IS_DIR(ino)) return ENOTDIR;
/* We are going to need at least one free inode to store children in. */
if (!have_free_inode()) return ENFILE;
/* If we don't have a directory handle yet, get one now. */
if ((r = get_handle(ino)) != OK)
return r;
off = 0;
user_off = 0;
user_left = m_in.REQ_MEM_SIZE;
/* We use the seek position as file index number. The first position is for
* the "." entry, the second position is for the ".." entry, and the next
* position numbers each represent a file in the directory.
*/
for (pos = m_in.REQ_SEEK_POS_LO; ; pos++) {
/* Determine which inode and name to use for this entry.
* We have no idea whether the host will give us "." and/or "..",
* so generate our own and skip those from the host.
*/
if (pos == 0) {
/* Entry for ".". */
child = ino;
strcpy(name, ".");
get_inode(child);
}
else if (pos == 1) {
/* Entry for "..", but only when there is a parent. */
if (ino->i_parent == NULL)
continue;
child = ino->i_parent;
strcpy(name, "..");
get_inode(child);
}
else {
/* Any other entry, not being "." or "..". */
r = sffs_table->t_readdir(ino->i_dir, pos - 2, name,
sizeof(name), &attr);
if (r != OK) {
/* No more entries? Then close the handle and stop. */
if (r == ENOENT) {
put_handle(ino);
break;
}
/* FIXME: what if the error is ENAMETOOLONG? */
return r;
}
if (!strcmp(name, ".") || !strcmp(name, ".."))
continue;
if ((child = lookup_dentry(ino, name)) == NULL) {
child = get_free_inode();
/* We were promised a free inode! */
assert(child != NULL);
child->i_flags = MODE_TO_DIRFLAG(attr.a_mode);
add_dentry(ino, name, child);
}
}
len = DWORD_ALIGN(sizeof(struct dirent) + strlen(name));
/* Is the user buffer too small to store another record?
* Note that we will be rerequesting the same dentry upon a subsequent
* getdents call this way, but we really need the name length for this.
*/
if (user_off + off + len > user_left) {
put_inode(child);
/* Is the user buffer too small for even a single record? */
if (user_off == 0 && off == 0)
return EINVAL;
break;
}
/* If our own buffer cannot contain the new record, copy out first. */
if (off + len > sizeof(buf)) {
r = sys_safecopyto(m_in.m_source, m_in.REQ_GRANT,
user_off, (vir_bytes) buf, off, D);
if (r != OK) {
put_inode(child);
return r;
}
user_off += off;
user_left -= off;
off = 0;
}
/* Fill in the actual directory entry. */
dent = (struct dirent *) &buf[off];
dent->d_ino = INODE_NR(child);
dent->d_off = pos;
dent->d_reclen = len;
strcpy(dent->d_name, name);
off += len;
put_inode(child);
}
/* If there is anything left in our own buffer, copy that out now. */
if (off > 0) {
r = sys_safecopyto(m_in.m_source, m_in.REQ_GRANT, user_off,
(vir_bytes) buf, off, D);
if (r != OK)
return r;
user_off += off;
}
m_out.RES_SEEK_POS_HI = 0;
m_out.RES_SEEK_POS_LO = pos;
m_out.RES_NBYTES = user_off;
return OK;
}
/*
* Create a hardlink
* N.B. After this call _both_ ffhp and tfhp need an fh_put
*/
int
nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp,
char *fname, int len, struct svc_fh *tfhp)
{
struct dentry *ddir, *dnew, *dold;
struct inode *dirp, *dest;
int err;
err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_CREATE);
if (err)
goto out;
err = fh_verify(rqstp, tfhp, S_IFREG, MAY_NOP);
if (err)
goto out;
err = nfserr_perm;
if (!len)
goto out;
ddir = ffhp->fh_dentry;
dirp = ddir->d_inode;
dnew = lookup_dentry(fname, dget(ddir), 0);
err = PTR_ERR(dnew);
if (IS_ERR(dnew))
goto out_nfserr;
/*
* Lock the parent before checking for existence
*/
err = fh_lock_parent(ffhp, dnew);
if (err)
goto out_dput;
err = nfserr_exist;
if (dnew->d_inode)
goto out_unlock;
dold = tfhp->fh_dentry;
dest = dold->d_inode;
err = nfserr_acces;
if (nfsd_iscovered(ddir, ffhp->fh_export))
goto out_unlock;
/* FIXME: nxdev for NFSv3 */
if (dirp->i_dev != dest->i_dev)
goto out_unlock;
err = nfserr_perm;
if (IS_IMMUTABLE(dest) /* || IS_APPEND(dest) */ )
goto out_unlock;
if (!dirp->i_op || !dirp->i_op->link)
goto out_unlock;
DQUOT_INIT(dirp);
err = dirp->i_op->link(dold, dirp, dnew);
DQUOT_DROP(dirp);
if (!err) {
if (EX_ISSYNC(ffhp->fh_export)) {
write_inode_now(dirp);
write_inode_now(dest);
}
} else
err = nfserrno(-err);
out_unlock:
fh_unlock(ffhp);
out_dput:
dput(dnew);
out:
return err;
out_nfserr:
err = nfserrno(-err);
goto out;
}
/*
* Create a symlink and look up its inode
* N.B. After this call _both_ fhp and resfhp need an fh_put
*/
int
nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
char *fname, int flen,
char *path, int plen,
struct svc_fh *resfhp)
{
struct dentry *dentry, *dnew;
struct inode *dirp;
int err;
err = nfserr_noent;
if (!flen || !plen)
goto out;
err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
if (err)
goto out;
dentry = fhp->fh_dentry;
err = nfserr_perm;
if (nfsd_iscovered(dentry, fhp->fh_export))
goto out;
dirp = dentry->d_inode;
if (!dirp->i_op || !dirp->i_op->symlink)
goto out;
dnew = lookup_dentry(fname, dget(dentry), 0);
err = PTR_ERR(dnew);
if (IS_ERR(dnew))
goto out_nfserr;
/*
* Lock the parent before checking for existence
*/
err = fh_lock_parent(fhp, dnew);
if (err)
goto out_compose;
err = nfserr_exist;
if (!dnew->d_inode) {
DQUOT_INIT(dirp);
err = dirp->i_op->symlink(dirp, dnew, path);
DQUOT_DROP(dirp);
if (!err) {
if (EX_ISSYNC(fhp->fh_export))
write_inode_now(dirp);
} else
err = nfserrno(-err);
}
fh_unlock(fhp);
/* Compose the fh so the dentry will be freed ... */
out_compose:
fh_compose(resfhp, fhp->fh_export, dnew);
out:
return err;
out_nfserr:
err = nfserrno(-err);
goto out;
}
/*
* Create a file (regular, directory, device, fifo); UNIX sockets
* not yet implemented.
* If the response fh has been verified, the parent directory should
* already be locked. Note that the parent directory is left locked.
*
* N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp
*/
int
nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
char *fname, int flen, struct iattr *iap,
int type, dev_t rdev, struct svc_fh *resfhp)
{
struct dentry *dentry, *dchild;
struct inode *dirp;
nfsd_dirop_t opfunc = NULL;
int err;
err = nfserr_perm;
if (!flen)
goto out;
err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
if (err)
goto out;
dentry = fhp->fh_dentry;
dirp = dentry->d_inode;
err = nfserr_notdir;
if(!dirp->i_op || !dirp->i_op->lookup)
goto out;
/*
* Check whether the response file handle has been verified yet.
* If it has, the parent directory should already be locked.
*/
if (!resfhp->fh_dverified) {
dchild = lookup_dentry(fname, dget(dentry), 0);
err = PTR_ERR(dchild);
if (IS_ERR(dchild))
goto out_nfserr;
fh_compose(resfhp, fhp->fh_export, dchild);
/* Lock the parent and check for errors ... */
err = fh_lock_parent(fhp, dchild);
if (err)
goto out;
} else {
dchild = resfhp->fh_dentry;
if (!fhp->fh_locked)
printk(KERN_ERR
"nfsd_create: parent %s/%s not locked!\n",
dentry->d_parent->d_name.name,
dentry->d_name.name);
}
/*
* Make sure the child dentry is still negative ...
*/
err = nfserr_exist;
if (dchild->d_inode) {
printk(KERN_WARNING
"nfsd_create: dentry %s/%s not negative!\n",
dentry->d_name.name, dchild->d_name.name);
goto out;
}
/*
* Get the dir op function pointer.
*/
err = nfserr_perm;
switch (type) {
case S_IFREG:
opfunc = (nfsd_dirop_t) dirp->i_op->create;
break;
case S_IFDIR:
opfunc = (nfsd_dirop_t) dirp->i_op->mkdir;
break;
case S_IFCHR:
case S_IFBLK:
/* The client is _NOT_ required to do security enforcement */
if(!capable(CAP_SYS_ADMIN))
{
err = -EPERM;
goto out;
}
case S_IFIFO:
case S_IFSOCK:
opfunc = dirp->i_op->mknod;
break;
}
if (!opfunc)
goto out;
if (!(iap->ia_valid & ATTR_MODE))
iap->ia_mode = 0;
/*
* Call the dir op function to create the object.
*/
DQUOT_INIT(dirp);
err = opfunc(dirp, dchild, iap->ia_mode, rdev);
DQUOT_DROP(dirp);
if (err < 0)
goto out_nfserr;
if (EX_ISSYNC(fhp->fh_export))
write_inode_now(dirp);
/*
* Update the file handle to get the new inode info.
*/
fh_update(resfhp);
/* Set file attributes. Mode has already been set and
* setting uid/gid works only for root. Irix appears to
* send along the gid when it tries to implement setgid
* directories via NFS.
*/
err = 0;
if ((iap->ia_valid &= (ATTR_UID|ATTR_GID|ATTR_MODE)) != 0)
err = nfsd_setattr(rqstp, resfhp, iap);
out:
return err;
out_nfserr:
err = nfserrno(-err);
goto out;
}
static char *resolv_virt(const char *pathname, int must_exist, int flags)
{
struct dentry *root, *origroot;
struct dentry *dentry;
char *newpathname = NULL;
char *page = NULL;
char *path = NULL;
int pathlen = 0;
lock_kernel();
DEB((KERN_INFO "resolve_virt pathname: '%s'\n",
pathname ? pathname : "(null)"));
root = lookup_dentry(OVERLAY_DIR, NULL, 1);
if(IS_ERR(root))
goto out;
if(!root->d_inode) {
dput(root);
goto out;
}
origroot = current->fs->root;
current->fs->root = root;
dentry = lookup_dentry(pathname, NULL, flags);
if(!IS_ERR(dentry)) {
if((!must_exist || dentry->d_inode) && path_ok(dentry)) {
page = (char *) __get_free_page(GFP_USER);
if(page) {
path = d_path(dentry, page, PAGE_SIZE);
DEB((KERN_INFO "resolve_virt path = '%s'\n",
path));
pathlen = (unsigned int) page + PAGE_SIZE -
(unsigned int) path;
}
}
dput(dentry);
}
current->fs->root = origroot;
dput(root);
if(path) {
int isvirtual;
dentry = lookup_dentry(path, NULL, flags);
if(!IS_ERR(dentry)) {
if(dentry->d_inode)
isvirtual = 0;
else if(must_exist)
isvirtual = 1;
else if(strchr(path, AVFS_MAGIC_CHAR))
isvirtual = 1;
else
isvirtual = 0;
dput(dentry);
}
else {
isvirtual = 1;
}
if(!isvirtual) {
newpathname = kmalloc(pathlen + 1,
GFP_USER);
if(newpathname)
strncpy(newpathname, path, pathlen);
}
else {
newpathname = kmalloc(OVERLAY_DIR_LEN + pathlen + 1,
GFP_USER);
if(newpathname) {
strcpy(newpathname, OVERLAY_DIR);
strncat(newpathname, path, pathlen);
}
}
}
if(page)
free_page((unsigned long) page);
DEB((KERN_INFO "resolve_virt newpathname: '%s'\n",
newpathname ? newpathname : "(null)"));
out:
unlock_kernel();
return newpathname;
}
/*
* Unlink a file or directory
* N.B. After this call fhp needs an fh_put
*/
int
nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
char *fname, int flen)
{
struct dentry *dentry, *rdentry;
struct inode *dirp;
int err;
/* N.B. We shouldn't need this test ... handled by dentry layer */
err = nfserr_acces;
if (!flen || isdotent(fname, flen))
goto out;
err = fh_verify(rqstp, fhp, S_IFDIR, MAY_REMOVE);
if (err)
goto out;
dentry = fhp->fh_dentry;
dirp = dentry->d_inode;
rdentry = lookup_dentry(fname, dget(dentry), 0);
err = PTR_ERR(rdentry);
if (IS_ERR(rdentry))
goto out_nfserr;
if (!rdentry->d_inode) {
dput(rdentry);
err = nfserr_noent;
goto out;
}
if (type != S_IFDIR) {
/* It's UNLINK */
err = fh_lock_parent(fhp, rdentry);
if (err)
goto out;
err = vfs_unlink(dirp, rdentry);
DQUOT_DROP(dirp);
fh_unlock(fhp);
dput(rdentry);
} else {
/* It's RMDIR */
/* See comments in fs/namei.c:do_rmdir */
rdentry->d_count++;
nfsd_double_down(&dirp->i_sem, &rdentry->d_inode->i_sem);
if (!fhp->fh_pre_mtime)
fhp->fh_pre_mtime = dirp->i_mtime;
fhp->fh_locked = 1;
err = -ENOENT;
if (check_parent(dirp, rdentry))
err = vfs_rmdir(dirp, rdentry);
rdentry->d_count--;
DQUOT_DROP(dirp);
if (!fhp->fh_post_version)
fhp->fh_post_version = dirp->i_version;
fhp->fh_locked = 0;
nfsd_double_up(&dirp->i_sem, &rdentry->d_inode->i_sem);
dput(rdentry);
}
if (err)
goto out_nfserr;
if (EX_ISSYNC(fhp->fh_export))
write_inode_now(dirp);
out:
return err;
out_nfserr:
err = nfserrno(-err);
goto out;
}
/*
* Rename a file
* N.B. After this call _both_ ffhp and tfhp need an fh_put
*/
int
nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
struct svc_fh *tfhp, char *tname, int tlen)
{
struct dentry *fdentry, *tdentry, *odentry, *ndentry;
struct inode *fdir, *tdir;
int err;
err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_REMOVE);
if (err)
goto out;
err = fh_verify(rqstp, tfhp, S_IFDIR, MAY_CREATE);
if (err)
goto out;
fdentry = ffhp->fh_dentry;
fdir = fdentry->d_inode;
tdentry = tfhp->fh_dentry;
tdir = tdentry->d_inode;
/* N.B. We shouldn't need this ... dentry layer handles it */
err = nfserr_perm;
if (!flen || (fname[0] == '.' &&
(flen == 1 || (flen == 2 && fname[1] == '.'))) ||
!tlen || (tname[0] == '.' &&
(tlen == 1 || (tlen == 2 && tname[1] == '.'))))
goto out;
odentry = lookup_dentry(fname, dget(fdentry), 0);
err = PTR_ERR(odentry);
if (IS_ERR(odentry))
goto out_nfserr;
err = -ENOENT;
if (!odentry->d_inode)
goto out_dput_old;
ndentry = lookup_dentry(tname, dget(tdentry), 0);
err = PTR_ERR(ndentry);
if (IS_ERR(ndentry))
goto out_dput_old;
/*
* Lock the parent directories.
*/
nfsd_double_down(&tdir->i_sem, &fdir->i_sem);
err = -ENOENT;
/* GAM3 check for parent changes after locking. */
if (check_parent(fdir, odentry) &&
check_parent(tdir, ndentry)) {
err = vfs_rename(fdir, odentry, tdir, ndentry);
if (!err && EX_ISSYNC(tfhp->fh_export)) {
write_inode_now(fdir);
write_inode_now(tdir);
}
} else
dprintk("nfsd: Caught race in nfsd_rename");
DQUOT_DROP(fdir);
DQUOT_DROP(tdir);
nfsd_double_up(&tdir->i_sem, &fdir->i_sem);
dput(ndentry);
out_dput_old:
dput(odentry);
if (err)
goto out_nfserr;
out:
return err;
out_nfserr:
err = nfserrno(-err);
goto out;
}
/*===========================================================================*
* do_getdents *
*===========================================================================*/
ssize_t do_getdents(ino_t ino_nr, struct fsdriver_data *data, size_t bytes,
off_t *posp)
{
/* Retrieve directory entries.
*/
struct fsdriver_dentry fsdentry;
char name[NAME_MAX+1];
struct inode *ino, *child;
struct sffs_attr attr;
off_t pos;
int r;
/* must be at least sizeof(struct dirent) + NAME_MAX */
static char buf[BLOCK_SIZE];
if ((ino = find_inode(ino_nr)) == NULL)
return EINVAL;
if (!IS_DIR(ino)) return ENOTDIR;
if (*posp < 0 || *posp >= ULONG_MAX) return EINVAL;
/* We are going to need at least one free inode to store children in. */
if (!have_free_inode()) return ENFILE;
/* If we don't have a directory handle yet, get one now. */
if ((r = get_handle(ino)) != OK)
return r;
fsdriver_dentry_init(&fsdentry, data, bytes, buf, sizeof(buf));
/* We use the seek position as file index number. The first position is for
* the "." entry, the second position is for the ".." entry, and the next
* position numbers each represent a file in the directory.
*/
do {
/* Determine which inode and name to use for this entry.
* We have no idea whether the host will give us "." and/or "..",
* so generate our own and skip those from the host.
*/
pos = (*posp)++;
if (pos == 0) {
/* Entry for ".". */
child = ino;
strcpy(name, ".");
get_inode(child);
}
else if (pos == 1) {
/* Entry for "..", but only when there is a parent. */
if (ino->i_parent == NULL)
continue;
child = ino->i_parent;
strcpy(name, "..");
get_inode(child);
}
else {
/* Any other entry, not being "." or "..". */
attr.a_mask = SFFS_ATTR_MODE;
r = sffs_table->t_readdir(ino->i_dir, pos - 2, name,
sizeof(name), &attr);
if (r != OK) {
/* No more entries? Then close the handle and stop. */
if (r == ENOENT) {
put_handle(ino);
break;
}
/* FIXME: what if the error is ENAMETOOLONG? */
return r;
}
if (!strcmp(name, ".") || !strcmp(name, ".."))
continue;
if ((child = lookup_dentry(ino, name)) == NULL) {
child = get_free_inode();
/* We were promised a free inode! */
assert(child != NULL);
child->i_flags = MODE_TO_DIRFLAG(attr.a_mode);
add_dentry(ino, name, child);
}
}
r = fsdriver_dentry_add(&fsdentry, INODE_NR(child), name, strlen(name),
IS_DIR(child) ? DT_DIR : DT_REG);
put_inode(child);
if (r < 0)
return r;
} while (r > 0);
return fsdriver_dentry_finish(&fsdentry);
}