#include "cache.h"
-int has_symlink_leading_path(const char *name, char *last_symlink)
-{
- char path[PATH_MAX];
- const char *sp, *ep;
- char *dp;
-
- sp = name;
- dp = path;
-
- if (last_symlink && *last_symlink) {
- size_t last_len = strlen(last_symlink);
- size_t len = strlen(name);
- if (last_len < len &&
- !strncmp(name, last_symlink, last_len) &&
- name[last_len] == '/')
- return 1;
- *last_symlink = '\0';
+static struct cache_def {
+ char path[PATH_MAX + 1];
+ int len;
+ int flags;
+ int track_flags;
+ int prefix_len_stat_func;
+} cache;
+
+/*
+ * Returns the length (on a path component basis) of the longest
+ * common prefix match of 'name' and the cached path string.
+ */
+static inline int longest_match_lstat_cache(int len, const char *name,
+ int *previous_slash)
+{
+ int max_len, match_len = 0, match_len_prev = 0, i = 0;
+
+ max_len = len < cache.len ? len : cache.len;
+ while (i < max_len && name[i] == cache.path[i]) {
+ if (name[i] == '/') {
+ match_len_prev = match_len;
+ match_len = i;
+ }
+ i++;
+ }
+ /* Is the cached path string a substring of 'name'? */
+ if (i == cache.len && cache.len < len && name[cache.len] == '/') {
+ match_len_prev = match_len;
+ match_len = cache.len;
+ /* Is 'name' a substring of the cached path string? */
+ } else if ((i == len && len < cache.len && cache.path[len] == '/') ||
+ (i == len && len == cache.len)) {
+ match_len_prev = match_len;
+ match_len = len;
}
+ *previous_slash = match_len_prev;
+ return match_len;
+}
+
+static inline void reset_lstat_cache(int track_flags, int prefix_len_stat_func)
+{
+ cache.path[0] = '\0';
+ cache.len = 0;
+ cache.flags = 0;
+ cache.track_flags = track_flags;
+ cache.prefix_len_stat_func = prefix_len_stat_func;
+}
- while (1) {
- size_t len;
- struct stat st;
+#define FL_DIR (1 << 0)
+#define FL_NOENT (1 << 1)
+#define FL_SYMLINK (1 << 2)
+#define FL_LSTATERR (1 << 3)
+#define FL_ERR (1 << 4)
+#define FL_FULLPATH (1 << 5)
- ep = strchr(sp, '/');
- if (!ep)
+/*
+ * Check if name 'name' of length 'len' has a symlink leading
+ * component, or if the directory exists and is real, or not.
+ *
+ * To speed up the check, some information is allowed to be cached.
+ * This can be indicated by the 'track_flags' argument, which also can
+ * be used to indicate that we should check the full path.
+ *
+ * The 'prefix_len_stat_func' parameter can be used to set the length
+ * of the prefix, where the cache should use the stat() function
+ * instead of the lstat() function to test each path component.
+ */
+static int lstat_cache(int len, const char *name,
+ int track_flags, int prefix_len_stat_func)
+{
+ int match_len, last_slash, last_slash_dir, previous_slash;
+ int match_flags, ret_flags, save_flags, max_len, ret;
+ struct stat st;
+
+ if (cache.track_flags != track_flags ||
+ cache.prefix_len_stat_func != prefix_len_stat_func) {
+ /*
+ * As a safeguard we clear the cache if the values of
+ * track_flags and/or prefix_len_stat_func does not
+ * match with the last supplied values.
+ */
+ reset_lstat_cache(track_flags, prefix_len_stat_func);
+ match_len = last_slash = 0;
+ } else {
+ /*
+ * Check to see if we have a match from the cache for
+ * the 2 "excluding" path types.
+ */
+ match_len = last_slash =
+ longest_match_lstat_cache(len, name, &previous_slash);
+ match_flags = cache.flags & track_flags & (FL_NOENT|FL_SYMLINK);
+ if (match_flags && match_len == cache.len)
+ return match_flags;
+ /*
+ * If we now have match_len > 0, we would know that
+ * the matched part will always be a directory.
+ *
+ * Also, if we are tracking directories and 'name' is
+ * a substring of the cache on a path component basis,
+ * we can return immediately.
+ */
+ match_flags = track_flags & FL_DIR;
+ if (match_flags && len == match_len)
+ return match_flags;
+ }
+
+ /*
+ * Okay, no match from the cache so far, so now we have to
+ * check the rest of the path components.
+ */
+ ret_flags = FL_DIR;
+ last_slash_dir = last_slash;
+ max_len = len < PATH_MAX ? len : PATH_MAX;
+ while (match_len < max_len) {
+ do {
+ cache.path[match_len] = name[match_len];
+ match_len++;
+ } while (match_len < max_len && name[match_len] != '/');
+ if (match_len >= max_len && !(track_flags & FL_FULLPATH))
break;
- len = ep - sp;
- if (PATH_MAX <= dp + len - path + 2)
- return 0; /* new name is longer than that??? */
- memcpy(dp, sp, len);
- dp[len] = 0;
-
- if (lstat(path, &st))
- return 0;
- if (S_ISLNK(st.st_mode)) {
- if (last_symlink)
- strcpy(last_symlink, path);
- return 1;
+ last_slash = match_len;
+ cache.path[last_slash] = '\0';
+
+ if (last_slash <= prefix_len_stat_func)
+ ret = stat(cache.path, &st);
+ else
+ ret = lstat(cache.path, &st);
+
+ if (ret) {
+ ret_flags = FL_LSTATERR;
+ if (errno == ENOENT)
+ ret_flags |= FL_NOENT;
+ } else if (S_ISDIR(st.st_mode)) {
+ last_slash_dir = last_slash;
+ continue;
+ } else if (S_ISLNK(st.st_mode)) {
+ ret_flags = FL_SYMLINK;
+ } else {
+ ret_flags = FL_ERR;
}
+ break;
+ }
+
+ /*
+ * At the end update the cache. Note that max 3 different
+ * path types, FL_NOENT, FL_SYMLINK and FL_DIR, can be cached
+ * for the moment!
+ */
+ save_flags = ret_flags & track_flags & (FL_NOENT|FL_SYMLINK);
+ if (save_flags && last_slash > 0 && last_slash <= PATH_MAX) {
+ cache.path[last_slash] = '\0';
+ cache.len = last_slash;
+ cache.flags = save_flags;
+ } else if (track_flags & FL_DIR &&
+ last_slash_dir > 0 && last_slash_dir <= PATH_MAX) {
+ /*
+ * We have a separate test for the directory case,
+ * since it could be that we have found a symlink or a
+ * non-existing directory and the track_flags says
+ * that we cannot cache this fact, so the cache would
+ * then have been left empty in this case.
+ *
+ * But if we are allowed to track real directories, we
+ * can still cache the path components before the last
+ * one (the found symlink or non-existing component).
+ */
+ cache.path[last_slash_dir] = '\0';
+ cache.len = last_slash_dir;
+ cache.flags = FL_DIR;
+ } else {
+ reset_lstat_cache(track_flags, prefix_len_stat_func);
+ }
+ return ret_flags;
+}
- dp[len++] = '/';
- dp = dp + len;
- sp = ep + 1;
+/*
+ * Invalidate the given 'name' from the cache, if 'name' matches
+ * completely with the cache.
+ */
+void invalidate_lstat_cache(int len, const char *name)
+{
+ int match_len, previous_slash;
+
+ match_len = longest_match_lstat_cache(len, name, &previous_slash);
+ if (len == match_len) {
+ if ((cache.track_flags & FL_DIR) && previous_slash > 0) {
+ cache.path[previous_slash] = '\0';
+ cache.len = previous_slash;
+ cache.flags = FL_DIR;
+ } else
+ reset_lstat_cache(cache.track_flags,
+ cache.prefix_len_stat_func);
}
- return 0;
+}
+
+/*
+ * Completely clear the contents of the cache
+ */
+void clear_lstat_cache(void)
+{
+ reset_lstat_cache(0, 0);
+}
+
+#define USE_ONLY_LSTAT 0
+
+/*
+ * Return non-zero if path 'name' has a leading symlink component
+ */
+int has_symlink_leading_path(int len, const char *name)
+{
+ return lstat_cache(len, name,
+ FL_SYMLINK|FL_DIR, USE_ONLY_LSTAT) &
+ FL_SYMLINK;
+}
+
+/*
+ * Return non-zero if path 'name' has a leading symlink component or
+ * if some leading path component does not exists.
+ */
+int has_symlink_or_noent_leading_path(int len, const char *name)
+{
+ return lstat_cache(len, name,
+ FL_SYMLINK|FL_NOENT|FL_DIR, USE_ONLY_LSTAT) &
+ (FL_SYMLINK|FL_NOENT);
+}
+
+/*
+ * Return non-zero if all path components of 'name' exists as a
+ * directory. If prefix_len > 0, we will test with the stat()
+ * function instead of the lstat() function for a prefix length of
+ * 'prefix_len', thus we then allow for symlinks in the prefix part as
+ * long as those points to real existing directories.
+ */
+int has_dirs_only_path(int len, const char *name, int prefix_len)
+{
+ return lstat_cache(len, name,
+ FL_DIR|FL_FULLPATH, prefix_len) &
+ FL_DIR;
}
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