/*
* Remove an entry in the tree structure
*/
static void
removeentry(struct entry *ep)
{
struct entry *np;
np = ep->e_parent;
if (np->e_entries == ep) {
np->e_entries = ep->e_sibling;
} else {
for (np = np->e_entries; np != NULL; np = np->e_sibling) {
if (np->e_sibling == ep) {
np->e_sibling = ep->e_sibling;
break;
}
}
if (np == NULL)
badentry(ep, "cannot find entry in parent list");
}
}
/*
* Find unreferenced link names.
*/
void
findunreflinks(void)
{
struct entry *ep, *np;
ino_t i;
vprintf(stdout, "Find unreferenced names.\n");
for (i = ROOTINO; i < maxino; i++) {
ep = lookupino(i);
if (ep == NULL || ep->e_type == LEAF || TSTINO(i, dumpmap) == 0)
continue;
for (np = ep->e_entries; np != NULL; np = np->e_sibling) {
if (np->e_flags == 0) {
dprintf(stdout,
"%s: remove unreferenced name\n",
myname(np));
removeleaf(np);
freeentry(np);
}
}
}
/*
* Any leaves remaining in removed directories is unreferenced.
*/
for (ep = removelist; ep != NULL; ep = ep->e_next) {
for (np = ep->e_entries; np != NULL; np = np->e_sibling) {
if (np->e_type == LEAF) {
if (np->e_flags != 0)
badentry(np, "unreferenced with flags");
dprintf(stdout,
"%s: remove unreferenced name\n",
myname(np));
removeleaf(np);
freeentry(np);
}
}
}
}
/*
* Compare with the directory structure on the tape
* A paranoid check that things are as they should be.
*/
long
verifyfile(char *name, ino_t ino, int type)
{
struct entry *np, *ep;
long descend = GOOD;
ep = lookupname(name);
if (ep == NULL) {
fprintf(stderr, "Warning: missing name %s\n", name);
return (FAIL);
}
np = lookupino(ino);
if (np != ep)
descend = FAIL;
for ( ; np != NULL; np = np->e_links)
if (np == ep)
break;
if (np == NULL)
panic("missing inumber %ju\n", (uintmax_t)ino);
if (ep->e_type == LEAF && type != LEAF)
badentry(ep, "type should be LEAF");
return (descend);
}
/*
* Relocate an entry in the tree structure
*/
void
moveentry(struct entry *ep, char *newname)
{
struct entry *np;
char *cp;
np = lookupparent(newname);
if (np == NULL)
badentry(ep, "cannot move ROOT");
if (np != ep->e_parent) {
removeentry(ep);
ep->e_parent = np;
ep->e_sibling = np->e_entries;
np->e_entries = ep;
}
cp = strrchr(newname, '/') + 1;
freename(ep->e_name);
ep->e_name = savename(cp);
ep->e_namlen = strlen(cp);
if (strcmp(gentempname(ep), ep->e_name) == 0)
ep->e_flags |= TMPNAME;
else
ep->e_flags &= ~TMPNAME;
}
/*
* Remove old nodes (directories).
* Note that this routine runs in O(N*D) where:
* N is the number of directory entries to be removed.
* D is the maximum depth of the tree.
* If N == D this can be quite slow. If the list were
* topologically sorted, the deletion could be done in
* time O(N).
*/
void
removeoldnodes(void)
{
struct entry *ep, **prev;
long change;
vprintf(stdout, "Remove old nodes (directories).\n");
do {
change = 0;
prev = &removelist;
for (ep = removelist; ep != NULL; ep = *prev) {
if (ep->e_entries != NULL) {
prev = &ep->e_next;
continue;
}
*prev = ep->e_next;
removenode(ep);
freeentry(ep);
change++;
}
} while (change);
for (ep = removelist; ep != NULL; ep = ep->e_next)
badentry(ep, "cannot remove, non-empty");
}
/*
* This is the routine used to extract files for the 'r' command.
* Extract new leaves.
*/
void
createleaves(char *symtabfile)
{
struct entry *ep;
ino_t first;
long curvol;
if (command == 'R') {
vprintf(stdout, "Continue extraction of new leaves\n");
} else {
vprintf(stdout, "Extract new leaves.\n");
dumpsymtable(symtabfile, volno);
}
first = lowerbnd(ROOTINO);
curvol = volno;
while (curfile.ino < maxino) {
first = lowerbnd(first);
/*
* If the next available file is not the one which we
* expect then we have missed one or more files. Since
* we do not request files that were not on the tape,
* the lost files must have been due to a tape read error,
* or a file that was removed while the dump was in progress.
*/
while (first < curfile.ino) {
ep = lookupino(first);
if (ep == NULL)
panic("%ju: bad first\n", (uintmax_t)first);
fprintf(stderr, "%s: not found on tape\n", myname(ep));
ep->e_flags &= ~(NEW|EXTRACT);
first = lowerbnd(first);
}
/*
* If we find files on the tape that have no corresponding
* directory entries, then we must have found a file that
* was created while the dump was in progress. Since we have
* no name for it, we discard it knowing that it will be
* on the next incremental tape.
*/
if (first != curfile.ino) {
fprintf(stderr, "expected next file %ju, got %ju\n",
(uintmax_t)first, (uintmax_t)curfile.ino);
skipfile();
goto next;
}
ep = lookupino(curfile.ino);
if (ep == NULL)
panic("unknown file on tape\n");
if ((ep->e_flags & (NEW|EXTRACT)) == 0)
badentry(ep, "unexpected file on tape");
/*
* If the file is to be extracted, then the old file must
* be removed since its type may change from one leaf type
* to another (e.g. "file" to "character special").
*/
if ((ep->e_flags & EXTRACT) != 0) {
removeleaf(ep);
ep->e_flags &= ~REMOVED;
}
(void) extractfile(myname(ep));
ep->e_flags &= ~(NEW|EXTRACT);
/*
* We checkpoint the restore after every tape reel, so
* as to simplify the amount of work required by the
* 'R' command.
*/
next:
if (curvol != volno) {
dumpsymtable(symtabfile, volno);
skipmaps();
curvol = volno;
}
}
}
/*
* For each directory entry on the incremental tape, determine which
* category it falls into as follows:
* KEEP - entries that are to be left alone.
* NEW - new entries to be added.
* EXTRACT - files that must be updated with new contents.
* LINK - new links to be added.
* Renames are done at the same time.
*/
long
nodeupdates(char *name, ino_t ino, int type)
{
struct entry *ep, *np, *ip;
long descend = GOOD;
int lookuptype = 0;
int key = 0;
/* key values */
# define ONTAPE 0x1 /* inode is on the tape */
# define INOFND 0x2 /* inode already exists */
# define NAMEFND 0x4 /* name already exists */
# define MODECHG 0x8 /* mode of inode changed */
/*
* This routine is called once for each element in the
* directory hierarchy, with a full path name.
* The "type" value is incorrectly specified as LEAF for
* directories that are not on the dump tape.
*
* Check to see if the file is on the tape.
*/
if (TSTINO(ino, dumpmap))
key |= ONTAPE;
/*
* Check to see if the name exists, and if the name is a link.
*/
np = lookupname(name);
if (np != NULL) {
key |= NAMEFND;
ip = lookupino(np->e_ino);
if (ip == NULL)
panic("corrupted symbol table\n");
if (ip != np)
lookuptype = LINK;
}
/*
* Check to see if the inode exists, and if one of its links
* corresponds to the name (if one was found).
*/
ip = lookupino(ino);
if (ip != NULL) {
key |= INOFND;
for (ep = ip->e_links; ep != NULL; ep = ep->e_links) {
if (ep == np) {
ip = ep;
break;
}
}
}
/*
* If both a name and an inode are found, but they do not
* correspond to the same file, then both the inode that has
* been found and the inode corresponding to the name that
* has been found need to be renamed. The current pathname
* is the new name for the inode that has been found. Since
* all files to be deleted have already been removed, the
* named file is either a now unneeded link, or it must live
* under a new name in this dump level. If it is a link, it
* can be removed. If it is not a link, it is given a
* temporary name in anticipation that it will be renamed
* when it is later found by inode number.
*/
if (((key & (INOFND|NAMEFND)) == (INOFND|NAMEFND)) && ip != np) {
if (lookuptype == LINK) {
removeleaf(np);
freeentry(np);
} else {
dprintf(stdout, "name/inode conflict, mktempname %s\n",
myname(np));
mktempname(np);
}
np = NULL;
key &= ~NAMEFND;
}
if ((key & ONTAPE) &&
(((key & INOFND) && ip->e_type != type) ||
((key & NAMEFND) && np->e_type != type)))
key |= MODECHG;
/*
* Decide on the disposition of the file based on its flags.
* Note that we have already handled the case in which
* a name and inode are found that correspond to different files.
* Thus if both NAMEFND and INOFND are set then ip == np.
*/
switch (key) {
/*
* A previously existing file has been found.
* Mark it as KEEP so that other links to the inode can be
* detected, and so that it will not be reclaimed by the search
* for unreferenced names.
*/
case INOFND|NAMEFND:
ip->e_flags |= KEEP;
dprintf(stdout, "[%s] %s: %s\n", keyval(key), name,
flagvalues(ip));
break;
/*
* A file on the tape has a name which is the same as a name
* corresponding to a different file in the previous dump.
* Since all files to be deleted have already been removed,
* this file is either a now unneeded link, or it must live
* under a new name in this dump level. If it is a link, it
* can simply be removed. If it is not a link, it is given a
* temporary name in anticipation that it will be renamed
* when it is later found by inode number (see INOFND case
* below). The entry is then treated as a new file.
*/
case ONTAPE|NAMEFND:
case ONTAPE|NAMEFND|MODECHG:
if (lookuptype == LINK) {
removeleaf(np);
freeentry(np);
} else {
mktempname(np);
}
/* FALLTHROUGH */
/*
* A previously non-existent file.
* Add it to the file system, and request its extraction.
* If it is a directory, create it immediately.
* (Since the name is unused there can be no conflict)
*/
case ONTAPE:
ep = addentry(name, ino, type);
if (type == NODE)
newnode(ep);
ep->e_flags |= NEW|KEEP;
dprintf(stdout, "[%s] %s: %s\n", keyval(key), name,
flagvalues(ep));
break;
/*
* A file with the same inode number, but a different
* name has been found. If the other name has not already
* been found (indicated by the KEEP flag, see above) then
* this must be a new name for the file, and it is renamed.
* If the other name has been found then this must be a
* link to the file. Hard links to directories are not
* permitted, and are either deleted or converted to
* symbolic links. Finally, if the file is on the tape,
* a request is made to extract it.
*/
case ONTAPE|INOFND:
if (type == LEAF && (ip->e_flags & KEEP) == 0)
ip->e_flags |= EXTRACT;
/* FALLTHROUGH */
case INOFND:
if ((ip->e_flags & KEEP) == 0) {
renameit(myname(ip), name);
moveentry(ip, name);
ip->e_flags |= KEEP;
dprintf(stdout, "[%s] %s: %s\n", keyval(key), name,
flagvalues(ip));
break;
}
if (ip->e_type == NODE) {
descend = FAIL;
fprintf(stderr,
"deleted hard link %s to directory %s\n",
name, myname(ip));
break;
}
ep = addentry(name, ino, type|LINK);
ep->e_flags |= NEW;
dprintf(stdout, "[%s] %s: %s|LINK\n", keyval(key), name,
flagvalues(ep));
break;
/*
* A previously known file which is to be updated. If it is a link,
* then all names referring to the previous file must be removed
* so that the subset of them that remain can be recreated.
*/
case ONTAPE|INOFND|NAMEFND:
if (lookuptype == LINK) {
removeleaf(np);
freeentry(np);
ep = addentry(name, ino, type|LINK);
if (type == NODE)
newnode(ep);
ep->e_flags |= NEW|KEEP;
dprintf(stdout, "[%s] %s: %s|LINK\n", keyval(key), name,
flagvalues(ep));
break;
}
if (type == LEAF && lookuptype != LINK)
np->e_flags |= EXTRACT;
np->e_flags |= KEEP;
dprintf(stdout, "[%s] %s: %s\n", keyval(key), name,
flagvalues(np));
break;
/*
* An inode is being reused in a completely different way.
* Normally an extract can simply do an "unlink" followed
* by a "creat". Here we must do effectively the same
* thing. The complications arise because we cannot really
* delete a directory since it may still contain files
* that we need to rename, so we delete it from the symbol
* table, and put it on the list to be deleted eventually.
* Conversely if a directory is to be created, it must be
* done immediately, rather than waiting until the
* extraction phase.
*/
case ONTAPE|INOFND|MODECHG:
case ONTAPE|INOFND|NAMEFND|MODECHG:
if (ip->e_flags & KEEP) {
badentry(ip, "cannot KEEP and change modes");
break;
}
if (ip->e_type == LEAF) {
/* changing from leaf to node */
for (ip = lookupino(ino); ip != NULL; ip = ip->e_links) {
if (ip->e_type != LEAF)
badentry(ip, "NODE and LEAF links to same inode");
removeleaf(ip);
freeentry(ip);
}
ip = addentry(name, ino, type);
newnode(ip);
} else {
/* changing from node to leaf */
if ((ip->e_flags & TMPNAME) == 0)
mktempname(ip);
deleteino(ip->e_ino);
ip->e_next = removelist;
removelist = ip;
ip = addentry(name, ino, type);
}
ip->e_flags |= NEW|KEEP;
dprintf(stdout, "[%s] %s: %s\n", keyval(key), name,
flagvalues(ip));
break;
/*
* A hard link to a directory that has been removed.
* Ignore it.
*/
case NAMEFND:
dprintf(stdout, "[%s] %s: Extraneous name\n", keyval(key),
name);
descend = FAIL;
break;
/*
* If we find a directory entry for a file that is not on
* the tape, then we must have found a file that was created
* while the dump was in progress. Since we have no contents
* for it, we discard the name knowing that it will be on the
* next incremental tape.
*/
case 0:
fprintf(stderr, "%s: (inode %ju) not found on tape\n",
name, (uintmax_t)ino);
break;
/*
* If any of these arise, something is grievously wrong with
* the current state of the symbol table.
*/
case INOFND|NAMEFND|MODECHG:
case NAMEFND|MODECHG:
case INOFND|MODECHG:
fprintf(stderr, "[%s] %s: inconsistent state\n", keyval(key),
name);
break;
/*
* These states "cannot" arise for any state of the symbol table.
*/
case ONTAPE|MODECHG:
case MODECHG:
default:
panic("[%s] %s: impossible state\n", keyval(key), name);
break;
}
return (descend);
}
