/* vi: set sw=4 ts=4: */ /* * irel_ma.c * * Copyright (C) 1996, 1997 Theodore Ts'o. * * %Begin-Header% * This file may be redistributed under the terms of the GNU Public * License. * %End-Header% */ #include <fcntl.h> #include <stdio.h> #include <string.h> #if HAVE_UNISTD_H #include <unistd.h> #endif #if HAVE_ERRNO_H #include <errno.h> #endif #include "ext2_fs.h" #include "ext2fs.h" #include "irel.h" static errcode_t ima_put(ext2_irel irel, ext2_ino_t old, struct ext2_inode_relocate_entry *ent); static errcode_t ima_get(ext2_irel irel, ext2_ino_t old, struct ext2_inode_relocate_entry *ent); static errcode_t ima_get_by_orig(ext2_irel irel, ext2_ino_t orig, ext2_ino_t *old, struct ext2_inode_relocate_entry *ent); static errcode_t ima_start_iter(ext2_irel irel); static errcode_t ima_next(ext2_irel irel, ext2_ino_t *old, struct ext2_inode_relocate_entry *ent); static errcode_t ima_add_ref(ext2_irel irel, ext2_ino_t ino, struct ext2_inode_reference *ref); static errcode_t ima_start_iter_ref(ext2_irel irel, ext2_ino_t ino); static errcode_t ima_next_ref(ext2_irel irel, struct ext2_inode_reference *ref); static errcode_t ima_move(ext2_irel irel, ext2_ino_t old, ext2_ino_t new); static errcode_t ima_delete(ext2_irel irel, ext2_ino_t old); static errcode_t ima_free(ext2_irel irel); /* * This data structure stores the array of inode references; there is * a structure for each inode. */ struct inode_reference_entry { __u16 num; struct ext2_inode_reference *refs; }; struct irel_ma { __u32 magic; ext2_ino_t max_inode; ext2_ino_t ref_current; int ref_iter; ext2_ino_t *orig_map; struct ext2_inode_relocate_entry *entries; struct inode_reference_entry *ref_entries; }; errcode_t ext2fs_irel_memarray_create(char *name, ext2_ino_t max_inode, ext2_irel *new_irel) { ext2_irel irel = 0; errcode_t retval; struct irel_ma *ma = 0; size_t size; *new_irel = 0; /* * Allocate memory structures */ retval = ext2fs_get_mem(sizeof(struct ext2_inode_relocation_table), &irel); if (retval) goto errout; memset(irel, 0, sizeof(struct ext2_inode_relocation_table)); retval = ext2fs_get_mem(strlen(name)+1, &irel->name); if (retval) goto errout; strcpy(irel->name, name); retval = ext2fs_get_mem(sizeof(struct irel_ma), &ma); if (retval) goto errout; memset(ma, 0, sizeof(struct irel_ma)); irel->priv_data = ma; size = (size_t) (sizeof(ext2_ino_t) * (max_inode+1)); retval = ext2fs_get_mem(size, &ma->orig_map); if (retval) goto errout; memset(ma->orig_map, 0, size); size = (size_t) (sizeof(struct ext2_inode_relocate_entry) * (max_inode+1)); retval = ext2fs_get_mem(size, &ma->entries); if (retval) goto errout; memset(ma->entries, 0, size); size = (size_t) (sizeof(struct inode_reference_entry) * (max_inode+1)); retval = ext2fs_get_mem(size, &ma->ref_entries); if (retval) goto errout; memset(ma->ref_entries, 0, size); ma->max_inode = max_inode; /* * Fill in the irel data structure */ irel->put = ima_put; irel->get = ima_get; irel->get_by_orig = ima_get_by_orig; irel->start_iter = ima_start_iter; irel->next = ima_next; irel->add_ref = ima_add_ref; irel->start_iter_ref = ima_start_iter_ref; irel->next_ref = ima_next_ref; irel->move = ima_move; irel->delete = ima_delete; irel->free = ima_free; *new_irel = irel; return 0; errout: ima_free(irel); return retval; } static errcode_t ima_put(ext2_irel irel, ext2_ino_t old, struct ext2_inode_relocate_entry *ent) { struct inode_reference_entry *ref_ent; struct irel_ma *ma; errcode_t retval; size_t size, old_size; ma = irel->priv_data; if (old > ma->max_inode) return EXT2_ET_INVALID_ARGUMENT; /* * Force the orig field to the correct value; the application * program shouldn't be messing with this field. */ if (ma->entries[(unsigned) old].new == 0) ent->orig = old; else ent->orig = ma->entries[(unsigned) old].orig; /* * If max_refs has changed, reallocate the refs array */ ref_ent = ma->ref_entries + (unsigned) old; if (ref_ent->refs && ent->max_refs != ma->entries[(unsigned) old].max_refs) { size = (sizeof(struct ext2_inode_reference) * ent->max_refs); old_size = (sizeof(struct ext2_inode_reference) * ma->entries[(unsigned) old].max_refs); retval = ext2fs_resize_mem(old_size, size, &ref_ent->refs); if (retval) return retval; } ma->entries[(unsigned) old] = *ent; ma->orig_map[(unsigned) ent->orig] = old; return 0; } static errcode_t ima_get(ext2_irel irel, ext2_ino_t old, struct ext2_inode_relocate_entry *ent) { struct irel_ma *ma; ma = irel->priv_data; if (old > ma->max_inode) return EXT2_ET_INVALID_ARGUMENT; if (ma->entries[(unsigned) old].new == 0) return ENOENT; *ent = ma->entries[(unsigned) old]; return 0; } static errcode_t ima_get_by_orig(ext2_irel irel, ext2_ino_t orig, ext2_ino_t *old, struct ext2_inode_relocate_entry *ent) { struct irel_ma *ma; ext2_ino_t ino; ma = irel->priv_data; if (orig > ma->max_inode) return EXT2_ET_INVALID_ARGUMENT; ino = ma->orig_map[(unsigned) orig]; if (ino == 0) return ENOENT; *old = ino; *ent = ma->entries[(unsigned) ino]; return 0; } static errcode_t ima_start_iter(ext2_irel irel) { irel->current = 0; return 0; } static errcode_t ima_next(ext2_irel irel, ext2_ino_t *old, struct ext2_inode_relocate_entry *ent) { struct irel_ma *ma; ma = irel->priv_data; while (++irel->current < ma->max_inode) { if (ma->entries[(unsigned) irel->current].new == 0) continue; *old = irel->current; *ent = ma->entries[(unsigned) irel->current]; return 0; } *old = 0; return 0; } static errcode_t ima_add_ref(ext2_irel irel, ext2_ino_t ino, struct ext2_inode_reference *ref) { struct irel_ma *ma; size_t size; struct inode_reference_entry *ref_ent; struct ext2_inode_relocate_entry *ent; errcode_t retval; ma = irel->priv_data; if (ino > ma->max_inode) return EXT2_ET_INVALID_ARGUMENT; ref_ent = ma->ref_entries + (unsigned) ino; ent = ma->entries + (unsigned) ino; /* * If the inode reference array doesn't exist, create it. */ if (ref_ent->refs == 0) { size = (size_t) ((sizeof(struct ext2_inode_reference) * ent->max_refs)); retval = ext2fs_get_mem(size, &ref_ent->refs); if (retval) return retval; memset(ref_ent->refs, 0, size); ref_ent->num = 0; } if (ref_ent->num >= ent->max_refs) return EXT2_ET_TOO_MANY_REFS; ref_ent->refs[(unsigned) ref_ent->num++] = *ref; return 0; } static errcode_t ima_start_iter_ref(ext2_irel irel, ext2_ino_t ino) { struct irel_ma *ma; ma = irel->priv_data; if (ino > ma->max_inode) return EXT2_ET_INVALID_ARGUMENT; if (ma->entries[(unsigned) ino].new == 0) return ENOENT; ma->ref_current = ino; ma->ref_iter = 0; return 0; } static errcode_t ima_next_ref(ext2_irel irel, struct ext2_inode_reference *ref) { struct irel_ma *ma; struct inode_reference_entry *ref_ent; ma = irel->priv_data; ref_ent = ma->ref_entries + ma->ref_current; if ((ref_ent->refs == NULL) || (ma->ref_iter >= ref_ent->num)) { ref->block = 0; ref->offset = 0; return 0; } *ref = ref_ent->refs[ma->ref_iter++]; return 0; } static errcode_t ima_move(ext2_irel irel, ext2_ino_t old, ext2_ino_t new) { struct irel_ma *ma; ma = irel->priv_data; if ((old > ma->max_inode) || (new > ma->max_inode)) return EXT2_ET_INVALID_ARGUMENT; if (ma->entries[(unsigned) old].new == 0) return ENOENT; ma->entries[(unsigned) new] = ma->entries[(unsigned) old]; ext2fs_free_mem(&ma->ref_entries[(unsigned) new].refs); ma->ref_entries[(unsigned) new] = ma->ref_entries[(unsigned) old]; ma->entries[(unsigned) old].new = 0; ma->ref_entries[(unsigned) old].num = 0; ma->ref_entries[(unsigned) old].refs = 0; ma->orig_map[ma->entries[new].orig] = new; return 0; } static errcode_t ima_delete(ext2_irel irel, ext2_ino_t old) { struct irel_ma *ma; ma = irel->priv_data; if (old > ma->max_inode) return EXT2_ET_INVALID_ARGUMENT; if (ma->entries[(unsigned) old].new == 0) return ENOENT; ma->entries[old].new = 0; ext2fs_free_mem(&ma->ref_entries[(unsigned) old].refs); ma->orig_map[ma->entries[(unsigned) old].orig] = 0; ma->ref_entries[(unsigned) old].num = 0; ma->ref_entries[(unsigned) old].refs = 0; return 0; } static errcode_t ima_free(ext2_irel irel) { struct irel_ma *ma; ext2_ino_t ino; if (!irel) return 0; ma = irel->priv_data; if (ma) { ext2fs_free_mem(&ma->orig_map); ext2fs_free_mem(&ma->entries); if (ma->ref_entries) { for (ino = 0; ino <= ma->max_inode; ino++) { ext2fs_free_mem(&ma->ref_entries[(unsigned) ino].refs); } ext2fs_free_mem(&ma->ref_entries); } ext2fs_free_mem(&ma); } ext2fs_free_mem(&irel->name); ext2fs_free_mem(&irel); return 0; }