void fstree_insert_update_file(const char *path, const char *follow)
{
struct dir_record *dr;
struct vfile_record *vfr;
struct file_record *fr, *new_fr;
uint16_t key = ~0;
char *filename;
size_t length;
filename = split_basename(path, dirname);
if (!(dr = find_dr(dirname)))
goto DR;
else {
length = (size_t) strlen((char *) filename);
key = compute_crc32(key, (const unsigned char *) filename, length);
if (!(vfr = find(dr->vroot, key, 0))) {
PHOENIXFS_DBG("fstree_insert_update_file:: missing vfr: %s", filename);
goto VFR;
}
else {
if (vfr->HEAD >= 0)
fr = vfr->history[vfr->HEAD];
else
fr = NULL;
goto FR;
}
}
DR:
dr = make_dr(dirname);
insert_dr(dr);
VFR:
vfr = make_vfr(filename);
insert_vfr(dr, vfr);
FR:
if (!(new_fr = make_fr(path, follow))) {
PHOENIXFS_DBG("fstree_insert_update_file:: Can't make fr %s", path);
return;
}
/* If content is present in the old fr, don't make a new fr */
if (fr && !memcmp(fr->sha1, new_fr->sha1, 20)) {
PHOENIXFS_DBG("fstree_insert_update_file:: unmodified: %s", path);
free(new_fr);
return;
}
insert_fr(vfr, new_fr);
}
static int phoenixfs_rename(const char *path, const char *newpath)
{
char xnewpath[PATH_MAX];
struct dir_record *dr;
struct vfile_record *vfr, *new_vfr;
char *filename, *newfilename;
uint16_t key = ~0;
size_t length;
uint8_t start_rev, rev_nr;
PHOENIXFS_DBG("rename:: %s to %s", path, newpath);
build_xpath(xpath, path, 0);
build_xpath(xnewpath, newpath, 0);
if (rename(xpath, xnewpath) < 0)
return -errno;
/* Update fstree */
filename = split_basename(path, xpath);
if (!(dr = find_dr(xpath))) {
PHOENIXFS_DBG("rename:: Missing dr for %s", xpath);
return 0;
}
/* Find the old vfr to copy out data from and remove */
length = (size_t) strlen((char *) filename);
key = compute_crc32(key, (const unsigned char *) filename, length);
if (!(vfr = find(dr->vroot, key, 0))) {
PHOENIXFS_DBG("rename:: Missing vfr for %s", path);
return 0;
}
/* Make a new vfr and copy out history from old vfr */
newfilename = split_basename(path, NULL);
new_vfr = make_vfr(newfilename);
/* Compute start_rev and rev_nr */
if (vfr->HEAD < 0) {
start_rev = 0;
rev_nr = 0;
} else if (vfr->history[(vfr->HEAD + 1) % REV_TRUNCATE]) {
/* History is full, and is probably wrapping around */
start_rev = (vfr->HEAD + 1) % REV_TRUNCATE;
rev_nr = 20;
} else {
/* History is not completely filled */
start_rev = 0;
rev_nr = vfr->HEAD + 1;
}
PHOENIXFS_DBG("rename:: copying %d revisions", rev_nr);
while (start_rev < rev_nr) {
new_vfr->history[start_rev] = vfr->history[start_rev];
start_rev = (start_rev + 1) % REV_TRUNCATE;
}
new_vfr->HEAD = rev_nr - 1;
insert_vfr(dr, new_vfr);
/* Remove old vfr */
dr->vroot = remove_entry(dr->vroot, key);
return 0;
}
