169 lines
4.1 KiB
C
169 lines
4.1 KiB
C
/*
|
|
* This file contains the procedures that look up path names in the directory
|
|
* system and determine the pnode number that goes with a given path name.
|
|
*
|
|
* Created (based on MFS):
|
|
* June 2011 (Evgeniy Ivanov)
|
|
*/
|
|
|
|
#include "fs.h"
|
|
|
|
#include <sys/cdefs.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/types.h>
|
|
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
#include <puffs.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "puffs.h"
|
|
#include "puffs_priv.h"
|
|
|
|
|
|
/*===========================================================================*
|
|
* fs_lookup *
|
|
*===========================================================================*/
|
|
int fs_lookup(ino_t dir_nr, char *name, struct fsdriver_node *node,
|
|
int *is_mountpt)
|
|
{
|
|
struct puffs_node *pn, *pn_dir;
|
|
|
|
/* Find the pnode of the directory node. */
|
|
if ((pn_dir = puffs_pn_nodewalk(global_pu, 0, &dir_nr)) == NULL) {
|
|
lpuffs_debug("nodewalk failed\n");
|
|
return(EINVAL);
|
|
}
|
|
|
|
if (!S_ISDIR(pn_dir->pn_va.va_mode))
|
|
return ENOTDIR;
|
|
|
|
if ((pn = advance(pn_dir, name)) == NULL)
|
|
return err_code;
|
|
|
|
pn->pn_count++; /* open pnode */
|
|
|
|
node->fn_ino_nr = pn->pn_va.va_fileid;
|
|
node->fn_mode = pn->pn_va.va_mode;
|
|
node->fn_size = pn->pn_va.va_size;
|
|
node->fn_uid = pn->pn_va.va_uid;
|
|
node->fn_gid = pn->pn_va.va_gid;
|
|
node->fn_dev = pn->pn_va.va_rdev;
|
|
|
|
*is_mountpt = pn->pn_mountpoint;
|
|
|
|
return OK;
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* advance *
|
|
*===========================================================================*/
|
|
struct puffs_node *advance(
|
|
struct puffs_node *pn_dir, /* pnode for directory to be searched */
|
|
char string[NAME_MAX + 1] /* component name to look for */
|
|
)
|
|
{
|
|
/* Given a directory and a component of a path, look up the component in
|
|
* the directory, find the pnode, open it, and return a pointer to its pnode
|
|
* slot.
|
|
* TODO: instead of string, should get pcn.
|
|
*/
|
|
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}};
|
|
|
|
enum vtype node_vtype;
|
|
voff_t size;
|
|
dev_t rdev;
|
|
int error;
|
|
|
|
assert(pn_dir != NULL);
|
|
|
|
err_code = OK;
|
|
|
|
/* If 'string' is empty, return an error. */
|
|
if (string[0] == '\0') {
|
|
err_code = ENOENT;
|
|
return(NULL);
|
|
}
|
|
|
|
/* If dir has been removed return ENOENT. */
|
|
if (pn_dir->pn_va.va_nlink == NO_LINK) {
|
|
err_code = ENOENT;
|
|
return(NULL);
|
|
}
|
|
|
|
if (strcmp(string, ".") == 0) {
|
|
/* Otherwise we will fall into trouble: path for pnode to be looked up
|
|
* will be parent path (same pnode as the one to be looked up) +
|
|
* requested path. E.g. after several lookups we might get advance
|
|
* for "." with parent path "/././././././././.".
|
|
* FIXME: how is ".." handled then?
|
|
*
|
|
* Another problem is that after lookup pnode will be added
|
|
* to the pu_pnodelst, which already contains pnode instance for this
|
|
* pnode. It will cause lot of troubles.
|
|
* FIXME: check if this is actually correct, because if it is, we are
|
|
* in lots of trouble; there are many ways to reach already-open pnodes
|
|
*/
|
|
return pn_dir;
|
|
}
|
|
|
|
pni.pni_cookie = (void** )&pn;
|
|
pni.pni_vtype = &node_vtype;
|
|
pni.pni_size = &size;
|
|
pni.pni_rdev = &rdev;
|
|
|
|
pcn.pcn_namelen = strlen(string);
|
|
assert(pcn.pcn_namelen <= MAXPATHLEN);
|
|
strcpy(pcn.pcn_name, string);
|
|
|
|
if (buildpath) {
|
|
if (puffs_path_pcnbuild(global_pu, &pcn, pn_dir) != 0) {
|
|
lpuffs_debug("pathbuild error\n");
|
|
err_code = ENOENT;
|
|
return(NULL);
|
|
}
|
|
}
|
|
|
|
/* lookup *must* be present */
|
|
error = global_pu->pu_ops.puffs_node_lookup(global_pu, pn_dir, &pni, &pcn);
|
|
|
|
if (buildpath) {
|
|
if (error) {
|
|
global_pu->pu_pathfree(global_pu, &pcn.pcn_po_full);
|
|
err_code = ENOENT;
|
|
return(NULL);
|
|
} else {
|
|
struct puffs_node *_pn;
|
|
|
|
/*
|
|
* did we get a new node or a
|
|
* recycled node?
|
|
*/
|
|
_pn = PU_CMAP(global_pu, pn);
|
|
if (_pn->pn_po.po_path == NULL)
|
|
_pn->pn_po = pcn.pcn_po_full;
|
|
else
|
|
global_pu->pu_pathfree(global_pu, &pcn.pcn_po_full);
|
|
}
|
|
}
|
|
|
|
if (error) {
|
|
err_code = error < 0 ? error : -error;
|
|
return(NULL);
|
|
}
|
|
|
|
err_code = OK;
|
|
|
|
assert(pn != NULL);
|
|
|
|
return(pn);
|
|
}
|