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minix/lib/libpuffs/open.c
Thomas Veerman 490e0de548 Import librefuse and libpuffs 
Import libpuffs and our port of libpuffs. The port was done as part of
GSoC 2011 FUSE project, done by Evgeniy Ivanov. The librefuse import
did not require any porting efforts. Libpuffs has been modified to
understand our VFS-FS protocol and translate between that and PUFFS. As
an example that it works, fuse-ntfs-3g from pkgsrc can be compiled and
used to mount ntfs partitions:
mount -t ntfs-3g <device> <mountpoint>

FUSE only works with the asynchronous version of VFS. See <docs/UPDATING> on
how to run AVFS.

This patch further includes some changes to mount(1) and mount(2) so it's
possible to use file systems provided by pkgsrc (note: manual modifications
to /etc/system.conf are still needed. There has been made an exception for
fuse-ntfs-3g, so it already as an entry).
2011-11-14 11:53:05 +00:00

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/* Created (MFS based):
* June 2011 (Evgeniy Ivanov)
*/
#include "fs.h"
#include <sys/stat.h>
#include <string.h>
#include <assert.h>
#include <minix/com.h>
#include <minix/vfsif.h>
#include "puffs.h"
#include "puffs_priv.h"
/*===========================================================================*
* fs_create *
*===========================================================================*/
PUBLIC int fs_create()
{
int r;
struct puffs_node *pn_dir;
struct puffs_node *pn;
mode_t omode;
struct puffs_newinfo pni;
struct puffs_kcn pkcnp;
PUFFS_MAKECRED(pcr, &global_kcred);
struct puffs_cn pcn = {&pkcnp, (struct puffs_cred *) pcr, {0}};
struct vattr va;
time_t cur_time;
int len;
if (global_pu->pu_ops.puffs_node_create == NULL) {
lpuffs_debug("No puffs_node_create");
return(ENFILE);
}
/* Read request message */
omode = (mode_t) fs_m_in.REQ_MODE;
caller_uid = (uid_t) fs_m_in.REQ_UID;
caller_gid = (gid_t) fs_m_in.REQ_GID;
/* Copy the last component (i.e., file name) */
len = fs_m_in.REQ_PATH_LEN;
pcn.pcn_namelen = len - 1;
if (pcn.pcn_namelen > NAME_MAX)
return(ENAMETOOLONG);
err_code = sys_safecopyfrom(VFS_PROC_NR, (cp_grant_id_t) fs_m_in.REQ_GRANT,
(vir_bytes) 0, (vir_bytes) pcn.pcn_name,
(size_t) len, D);
if (err_code != OK) return(err_code);
NUL(pcn.pcn_name, len, sizeof(pcn.pcn_name));
/* Get last directory pnode (i.e., directory that will hold the new pnode) */
if ((pn_dir = puffs_pn_nodewalk(global_pu, 0, &fs_m_in.REQ_INODE_NR)) == NULL)
return(ENOENT);
memset(&pni, 0, sizeof(pni));
pni.pni_cookie = (void** )&pn;
cur_time = clock_time();
memset(&va, 0, sizeof(va));
va.va_type = VREG;
va.va_mode = omode;
va.va_uid = caller_uid;
va.va_gid = caller_gid;
va.va_atime.tv_sec = va.va_mtime.tv_sec = va.va_ctime.tv_sec = cur_time;
if (buildpath) {
r = puffs_path_pcnbuild(global_pu, &pcn, pn_dir);
if (r) {
lpuffs_debug("pathbuild error\n");
return(ENOENT);
}
}
r = global_pu->pu_ops.puffs_node_create(global_pu, pn_dir, &pni, &pcn, &va);
if (buildpath) {
if (r) {
global_pu->pu_pathfree(global_pu, &pcn.pcn_po_full);
} else {
struct puffs_node *_pn;
_pn = PU_CMAP(global_pu, pn);
_pn->pn_po = pcn.pcn_po_full;
}
}
if (r != OK) {
if (r > 0) r = -r;
return(r);
}
/* Open pnode */
pn->pn_count++;
update_times(pn_dir, MTIME | CTIME, cur_time);
/* Reply message */
fs_m_out.RES_INODE_NR = pn->pn_va.va_fileid;
fs_m_out.RES_MODE = pn->pn_va.va_mode;
fs_m_out.RES_FILE_SIZE_LO = pn->pn_va.va_size;
/* This values are needed for the execution */
fs_m_out.RES_UID = pn->pn_va.va_uid;
fs_m_out.RES_GID = pn->pn_va.va_gid;
return(OK);
}
/*===========================================================================*
* fs_mknod *
*===========================================================================*/
PUBLIC int fs_mknod()
{
int r;
struct puffs_node *pn_dir;
struct puffs_node *pn;
struct puffs_newinfo pni;
struct puffs_kcn pkcnp;
PUFFS_MAKECRED(pcr, &global_kcred);
struct puffs_cn pcn = {&pkcnp, (struct puffs_cred *) pcr, {0}};
struct vattr va;
time_t cur_time;
int len;
if (global_pu->pu_ops.puffs_node_mknod == NULL) {
lpuffs_debug("No puffs_node_mknod");
return(ENFILE);
}
/* Copy the last component and set up caller's user and group id */
len = fs_m_in.REQ_PATH_LEN;
pcn.pcn_namelen = len - 1;
if (pcn.pcn_namelen > NAME_MAX)
return(ENAMETOOLONG);
err_code = sys_safecopyfrom(VFS_PROC_NR, (cp_grant_id_t) fs_m_in.REQ_GRANT,
(vir_bytes) 0, (vir_bytes) pcn.pcn_name,
(size_t) len, D);
if (err_code != OK) return(err_code);
NUL(pcn.pcn_name, len, sizeof(pcn.pcn_name));
caller_uid = (uid_t) fs_m_in.REQ_UID;
caller_gid = (gid_t) fs_m_in.REQ_GID;
/* Get last directory pnode */
if ((pn_dir = puffs_pn_nodewalk(global_pu, 0, &fs_m_in.REQ_INODE_NR)) == NULL)
return(ENOENT);
memset(&pni, 0, sizeof(pni));
pni.pni_cookie = (void** )&pn;
cur_time = clock_time();
memset(&va, 0, sizeof(va));
va.va_type = VDIR;
va.va_mode = (mode_t) fs_m_in.REQ_MODE;
va.va_uid = caller_uid;
va.va_gid = caller_gid;
va.va_rdev = (dev_t) fs_m_in.REQ_DEV;
va.va_atime.tv_sec = va.va_mtime.tv_sec = va.va_ctime.tv_sec = cur_time;
if (buildpath) {
if (puffs_path_pcnbuild(global_pu, &pcn, pn_dir) != 0) {
lpuffs_debug("pathbuild error\n");
return(ENOENT);
}
}
r = global_pu->pu_ops.puffs_node_mknod(global_pu, pn_dir, &pni, &pcn, &va);
if (buildpath) {
if (r) {
global_pu->pu_pathfree(global_pu, &pcn.pcn_po_full);
} else {
struct puffs_node *_pn;
_pn = PU_CMAP(global_pu, pn);
_pn->pn_po = pcn.pcn_po_full;
}
}
if (r != OK) {
if (r > 0) r = -r;
return(r);
}
update_times(pn_dir, MTIME | CTIME, cur_time);
return(OK);
}
/*===========================================================================*
* fs_mkdir *
*===========================================================================*/
PUBLIC int fs_mkdir()
{
int r;
struct puffs_node *pn_dir;
struct puffs_node *pn;
struct puffs_newinfo pni;
struct puffs_kcn pkcnp;
PUFFS_MAKECRED(pcr, &global_kcred);
struct puffs_cn pcn = {&pkcnp, (struct puffs_cred *) pcr, {0}};
struct vattr va;
time_t cur_time;
int len;
if (global_pu->pu_ops.puffs_node_mkdir == NULL) {
lpuffs_debug("No puffs_node_mkdir");
return(ENFILE);
}
/* Copy the last component and set up caller's user and group id */
len = fs_m_in.REQ_PATH_LEN;
pcn.pcn_namelen = len - 1;
if (pcn.pcn_namelen > NAME_MAX)
return(ENAMETOOLONG);
err_code = sys_safecopyfrom(VFS_PROC_NR, (cp_grant_id_t) fs_m_in.REQ_GRANT,
(vir_bytes) 0, (vir_bytes) pcn.pcn_name,
(phys_bytes) len, D);
if (err_code != OK) return(err_code);
NUL(pcn.pcn_name, len, sizeof(pcn.pcn_name));
caller_uid = (uid_t) fs_m_in.REQ_UID;
caller_gid = (gid_t) fs_m_in.REQ_GID;
/* Get last directory pnode */
if ((pn_dir = puffs_pn_nodewalk(global_pu, 0, &fs_m_in.REQ_INODE_NR)) == NULL)
return(ENOENT);
cur_time = clock_time();
memset(&pni, 0, sizeof(pni));
pni.pni_cookie = (void** )&pn;
memset(&va, 0, sizeof(va));
va.va_type = VDIR;
va.va_mode = (mode_t) fs_m_in.REQ_MODE;
va.va_uid = caller_uid;
va.va_gid = caller_gid;
va.va_atime.tv_sec = va.va_mtime.tv_sec = va.va_ctime.tv_sec = cur_time;
if (buildpath) {
r = puffs_path_pcnbuild(global_pu, &pcn, pn_dir);
if (r) {
lpuffs_debug("pathbuild error\n");
return(ENOENT);
}
}
r = global_pu->pu_ops.puffs_node_mkdir(global_pu, pn_dir, &pni, &pcn, &va);
if (buildpath) {
if (r) {
global_pu->pu_pathfree(global_pu, &pcn.pcn_po_full);
} else {
struct puffs_node *_pn;
_pn = PU_CMAP(global_pu, pn);
_pn->pn_po = pcn.pcn_po_full;
}
}
if (r != OK) {
if (r > 0) r = -r;
return(r);
}
update_times(pn_dir, MTIME | CTIME, cur_time);
return(OK);
}
/*===========================================================================*
* fs_slink *
*===========================================================================*/
PUBLIC int fs_slink()
{
int r;
struct pnode *pn; /* pnode containing symbolic link */
struct pnode *pn_dir; /* directory containing link */
char target[PATH_MAX + 1]; /* target path */
struct puffs_newinfo pni;
struct puffs_kcn pkcnp;
PUFFS_MAKECRED(pcr, &global_kcred);
struct puffs_cn pcn = {&pkcnp, (struct puffs_cred *) pcr, {0}};
struct vattr va;
int len;
caller_uid = (uid_t) fs_m_in.REQ_UID;
caller_gid = (gid_t) fs_m_in.REQ_GID;
/* Copy the link name's last component */
len = fs_m_in.REQ_PATH_LEN;
pcn.pcn_namelen = len - 1;
if (pcn.pcn_namelen > NAME_MAX)
return(ENAMETOOLONG);
if (fs_m_in.REQ_MEM_SIZE >= PATH_MAX)
return(ENAMETOOLONG);
r = sys_safecopyfrom(VFS_PROC_NR, (cp_grant_id_t) fs_m_in.REQ_GRANT,
(vir_bytes) 0, (vir_bytes) pcn.pcn_name,
(size_t) len, D);
if (r != OK) return(r);
NUL(pcn.pcn_name, len, sizeof(pcn.pcn_name));
/* Copy the target path (note that it's not null terminated) */
r = sys_safecopyfrom(VFS_PROC_NR, (cp_grant_id_t) fs_m_in.REQ_GRANT3,
(vir_bytes) 0, (vir_bytes) target,
(size_t) fs_m_in.REQ_MEM_SIZE, D);
if (r != OK) return(r);
target[fs_m_in.REQ_MEM_SIZE] = '\0';
if (strlen(target) != fs_m_in.REQ_MEM_SIZE) {
/* This can happen if the user provides a buffer
* with a \0 in it. This can cause a lot of trouble
* when the symlink is used later. We could just use
* the strlen() value, but we want to let the user
* know he did something wrong. ENAMETOOLONG doesn't
* exactly describe the error, but there is no
* ENAMETOOWRONG.
*/
return(ENAMETOOLONG);
}
if ((pn_dir = puffs_pn_nodewalk(global_pu, 0, &fs_m_in.REQ_INODE_NR)) == NULL)
return(EINVAL);
memset(&pni, 0, sizeof(pni));
pni.pni_cookie = (void** )&pn;
memset(&va, 0, sizeof(va));
va.va_type = VLNK;
va.va_mode = (mode_t) (I_SYMBOLIC_LINK | RWX_MODES);
va.va_uid = caller_uid;
va.va_gid = caller_gid;
va.va_atime.tv_sec = va.va_mtime.tv_sec = va.va_ctime.tv_sec = clock_time();
if (buildpath) {
r = puffs_path_pcnbuild(global_pu, &pcn, pn_dir);
if (r) {
lpuffs_debug("pathbuild error\n");
return(ENOENT);
}
}
r = global_pu->pu_ops.puffs_node_symlink(global_pu, pn_dir, &pni, &pcn, &va, target);
if (buildpath) {
if (r) {
global_pu->pu_pathfree(global_pu, &pcn.pcn_po_full);
} else {
struct puffs_node *_pn;
_pn = PU_CMAP(global_pu, pn);
_pn->pn_po = pcn.pcn_po_full;
}
}
if (r > 0) r = -r;
return(r);
}
/*===========================================================================*
* fs_inhibread *
*===========================================================================*/
PUBLIC int fs_inhibread()
{
return(OK);
}
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