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minix/lib/libpuffs/open.c
Ben Gras 2bfeeed885 drop segment from safecopy invocations 
. all invocations were S or D, so can safely be dropped
	  to prepare for the segmentless world
	. still assign D to the SCP_SEG field in the message
	  to make previous kernels usable
2012-06-16 16:22:51 +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 *
*===========================================================================*/
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 *) __UNCONST(pcr), {0,0,0}};
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);
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 *
*===========================================================================*/
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 *) __UNCONST(pcr), {0,0,0}};
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);
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 *
*===========================================================================*/
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 *) __UNCONST(pcr), {0,0,0}};
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);
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 *
*===========================================================================*/
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 *) __UNCONST(pcr), {0,0,0}};
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);
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);
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 *
*===========================================================================*/
int fs_inhibread()
{
return(OK);
}
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