119 lines
3.8 KiB
C
119 lines
3.8 KiB
C
/* This file contains routines that verify inodes and paths against the host.
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*
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* The entry points into this file are:
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* verify_path check whether a path,inode pair is still valid
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* verify_inode construct a path for an inode and verify the inode
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* verify_dentry check a directory inode and look for a directory entry
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*
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* Created:
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* April 2009 (D.C. van Moolenbroek)
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*/
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#include "inc.h"
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/*===========================================================================*
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* verify_path *
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*===========================================================================*/
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int verify_path(char path[PATH_MAX], struct inode *ino,
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struct sffs_attr *attr, int *stale)
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{
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/* Given a path, and the inode associated with that path, verify if the inode
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* still matches the real world. Obtain the attributes of the file identified
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* by the given path, and see if they match. If not, possibly mark the inode
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* as deleted and return an error. Only upon success is the inode guaranteed
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* to be usable.
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*
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* The caller must set the a_mask field of the passed attr struct.
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* If 'stale' is not NULL, the value it points to must be initialized to 0,
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* and will be set to 1 if the path was valid but the inode wasn't.
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*/
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int r;
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attr->a_mask |= SFFS_ATTR_MODE;
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r = sffs_table->t_getattr(path, attr);
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dprintf(("%s: verify_path: getattr('%s') returned %d\n",
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sffs_name, path, r));
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if (r != OK) {
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/* If we are told that the path does not exist, delete the inode */
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if (r == ENOENT || r == ENOTDIR)
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del_dentry(ino);
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return r; /* path isn't valid */
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}
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/* If the file type (reg, dir) isn't what we thought, delete the inode */
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if ((ino->i_flags & I_DIR) != MODE_TO_DIRFLAG(attr->a_mode)) {
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del_dentry(ino);
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if (stale != NULL) *stale = 1;
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return ENOENT; /* path is valid, inode wasn't */
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}
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return OK; /* path and inode are valid */
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}
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/*===========================================================================*
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* verify_inode *
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*===========================================================================*/
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int verify_inode(
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struct inode *ino, /* inode to verify */
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char path[PATH_MAX], /* buffer in which to store the path */
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struct sffs_attr *attr /* buffer for attributes, or NULL */
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)
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{
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/* Given an inode, construct a path identifying the inode, and check whether
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* that path is still valid for that inode (as far as we can tell). As a side
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* effect, store attributes in the given attribute structure if not NULL (its
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* a_mask member must then be set).
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*/
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struct sffs_attr attr2;
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int r;
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if ((r = make_path(path, ino)) != OK) return r;
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if (attr == NULL) {
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attr2.a_mask = 0;
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attr = &attr2;
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}
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return verify_path(path, ino, attr, NULL);
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}
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/*===========================================================================*
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* verify_dentry *
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*===========================================================================*/
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int verify_dentry(
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struct inode *parent, /* parent inode: the inode to verify */
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char name[NAME_MAX+1], /* the given directory entry path component */
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char path[PATH_MAX], /* buffer to store the resulting path in */
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struct inode **res_ino /* pointer for addressed inode (or NULL) */
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)
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{
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/* Given a directory inode and a name, construct a path identifying that
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* directory entry, check whether the path to the parent is still valid, and
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* check whether there is an inode pointed to by the full path. Upon success,
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* res_ino will contain either the inode for the full path, with increased
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* refcount, or NULL if no such inode exists.
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*/
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int r;
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if ((r = verify_inode(parent, path, NULL)) != OK)
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return r;
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dprintf(("%s: verify_dentry: given path is '%s', name '%s'\n",
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sffs_name, path, name));
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if ((r = push_path(path, name)) != OK)
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return r;
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dprintf(("%s: verify_dentry: path now '%s'\n", sffs_name, path));
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*res_ino = lookup_dentry(parent, name);
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return OK;
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}
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