#endif
#include <time.h>
+#include "linux_version.h"
#include "blkidP.h"
struct ext2_super_block {
#endif
+/*
+ * Check to see if a filesystem is in /proc/filesystems.
+ * Returns 1 if found, 0 if not
+ */
+static int fs_proc_check(const char *fs_name)
+{
+ FILE *f;
+ char buf[80], *cp, *t;
+
+ f = fopen("/proc/filesystems", "r");
+ if (!f)
+ return 0;
+ while (!feof(f)) {
+ if (!fgets(buf, sizeof(buf), f))
+ break;
+ cp = buf;
+ if (!isspace(*cp)) {
+ while (*cp && !isspace(*cp))
+ cp++;
+ }
+ while (*cp && isspace(*cp))
+ cp++;
+ if ((t = strchr(cp, '\n')) != NULL)
+ *t = 0;
+ if ((t = strchr(cp, '\t')) != NULL)
+ *t = 0;
+ if ((t = strchr(cp, ' ')) != NULL)
+ *t = 0;
+ if (!strcmp(fs_name, cp)) {
+ fclose(f);
+ return 1;
+ }
+ }
+ fclose(f);
+ return (0);
+}
+
+/*
+ * Check to see if a filesystem is available as a module
+ * Returns 1 if found, 0 if not
+ */
+static int check_for_modules(const char *fs_name)
+{
+#ifdef __linux__
+ struct utsname uts;
+ FILE *f;
+ char buf[1024], *cp, *t;
+ int i;
+
+ if (uname(&uts))
+ return 0;
+ snprintf(buf, sizeof(buf), "/lib/modules/%s/modules.dep", uts.release);
+
+ f = fopen(buf, "r");
+ if (!f)
+ return 0;
+ while (!feof(f)) {
+ if (!fgets(buf, sizeof(buf), f))
+ break;
+ if ((cp = strchr(buf, ':')) != NULL)
+ *cp = 0;
+ else
+ continue;
+ if ((cp = strrchr(buf, '/')) == NULL)
+ continue;
+ cp++;
+ i = strlen(cp);
+ if (i > 3) {
+ t = cp + i - 3;
+ if (!strcmp(t, ".ko"))
+ *t = 0;
+ }
+ if (!strcmp(cp, fs_name)) {
+ fclose(f);
+ return 1;
+ }
+ }
+ fclose(f);
+#endif /* __linux__ */
+ return 0;
+}
+
+/*
+ * Starting in 2.6.29, ext4 can be used to support filesystems
+ * without a journal.
+ */
+#define EXT4_SUPPORTS_EXT2 KERNEL_VERSION(2, 6, 29)
+
+static int system_supports_ext2(void)
+{
+ static time_t last_check = 0;
+ static int ret = -1;
+ time_t now = time(0);
+
+ if (ret != -1 || (now - last_check) < 5)
+ return ret;
+ last_check = now;
+ ret = (fs_proc_check("ext2") || check_for_modules("ext2"));
+ return ret;
+}
+
+static int system_supports_ext4(void)
+{
+ static time_t last_check = 0;
+ static int ret = -1;
+ time_t now = time(0);
+
+ if (ret != -1 || (now - last_check) < 5)
+ return ret;
+ last_check = now;
+ ret = (fs_proc_check("ext4") || check_for_modules("ext4"));
+ return ret;
+}
+
+static int system_supports_ext4dev(void)
+{
+ static time_t last_check = 0;
+ static int ret = -1;
+ time_t now = time(0);
+
+ if (ret != -1 || (now - last_check) < 5)
+ return ret;
+ last_check = now;
+ ret = (fs_proc_check("ext4dev") || check_for_modules("ext4dev"));
+ return ret;
+}
/*
* reads superblock and returns:
* fc = feature_compat
(fi & EXT2_FEATURE_INCOMPAT_UNSUPPORTED))
return -BLKID_ERR_PARAM;
+ /*
+ * If ext2 is not present, but ext4 or ext4dev are, then
+ * disclaim we are ext2
+ */
+ if (!system_supports_ext2() &&
+ (system_supports_ext4() || system_supports_ext4dev()) &&
+ get_linux_version() >= EXT4_SUPPORTS_EXT2)
+ return -BLKID_ERR_PARAM;
+
ext_get_info(pr, 2, es);
return 0;
}
return 0;
}
-/***
- * PLEASE, close your eyes and press PageDown quickly.
- *
- * ... the code below is ugly heuristic to detect if
- * system supports ext4 or ext4dev.
- * --kzak
- ****/
-
-/*
- * Check to see if a filesystem is in /proc/filesystems.
- * Returns 1 if found, 0 if not
- */
-static int fs_proc_check(const char *fs_name)
-{
- FILE *f;
- char buf[80], *cp, *t;
-
- f = fopen("/proc/filesystems", "r");
- if (!f)
- return 0;
- while (!feof(f)) {
- if (!fgets(buf, sizeof(buf), f))
- break;
- cp = buf;
- if (!isspace(*cp)) {
- while (*cp && !isspace(*cp))
- cp++;
- }
- while (*cp && isspace(*cp))
- cp++;
- if ((t = strchr(cp, '\n')) != NULL)
- *t = 0;
- if ((t = strchr(cp, '\t')) != NULL)
- *t = 0;
- if ((t = strchr(cp, ' ')) != NULL)
- *t = 0;
- if (!strcmp(fs_name, cp)) {
- fclose(f);
- return 1;
- }
- }
- fclose(f);
- return (0);
-}
-
-/*
- * Check to see if a filesystem is available as a module
- * Returns 1 if found, 0 if not
- */
-static int check_for_modules(const char *fs_name)
-{
-#ifdef __linux__
- struct utsname uts;
- FILE *f;
- char buf[1024], *cp, *t;
- int i;
-
- if (uname(&uts))
- return 0;
- snprintf(buf, sizeof(buf), "/lib/modules/%s/modules.dep", uts.release);
-
- f = fopen(buf, "r");
- if (!f)
- return 0;
- while (!feof(f)) {
- if (!fgets(buf, sizeof(buf), f))
- break;
- if ((cp = strchr(buf, ':')) != NULL)
- *cp = 0;
- else
- continue;
- if ((cp = strrchr(buf, '/')) == NULL)
- continue;
- cp++;
- i = strlen(cp);
- if (i > 3) {
- t = cp + i - 3;
- if (!strcmp(t, ".ko"))
- *t = 0;
- }
- if (!strcmp(cp, fs_name)) {
- fclose(f);
- return 1;
- }
- }
- fclose(f);
-#endif /* __linux__ */
- return 0;
-}
-
-static int system_supports_ext4(void)
-{
- static time_t last_check = 0;
- static int ret = -1;
- time_t now = time(0);
-
- if (ret != -1 || (now - last_check) < 5)
- return ret;
- last_check = now;
- ret = (fs_proc_check("ext4") || check_for_modules("ext4"));
- return ret;
-}
-
-static int system_supports_ext4dev(void)
-{
- static time_t last_check = 0;
- static int ret = -1;
- time_t now = time(0);
-
- if (ret != -1 || (now - last_check) < 5)
- return ret;
- last_check = now;
- ret = (fs_proc_check("ext4dev") || check_for_modules("ext4dev"));
- return ret;
-}
static int probe_ext4dev(blkid_probe pr, const struct blkid_idmag *mag)
{
if (fi & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
return -BLKID_ERR_PARAM;
+ /*
+ * If the filesystem does not have a journal and ext2 and ext4
+ * is not present, then force this to be detected as an
+ * ext4dev filesystem.
+ */
+ if (!(fc & EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
+ !system_supports_ext2() && !system_supports_ext4() &&
+ system_supports_ext4dev() &&
+ get_linux_version() >= EXT4_SUPPORTS_EXT2)
+ goto force_ext4dev;
+
/*
* If the filesystem is marked as OK for use by in-development
* filesystem code, but ext4dev is not supported, and ext4 is,
} else
return -BLKID_ERR_PARAM;
+force_ext4dev:
ext_get_info(pr, 4, es);
return 0;
}
!(fi & EXT3_FEATURE_INCOMPAT_UNSUPPORTED))
return -BLKID_ERR_PARAM;
+ /*
+ * If the filesystem does not have a journal and ext2 is not
+ * present, then force this to be detected as an ext2
+ * filesystem.
+ */
+ if (!(fc & EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
+ !system_supports_ext2() && system_supports_ext4() &&
+ get_linux_version() >= EXT4_SUPPORTS_EXT2)
+ goto force_ext4;
+
/*
* If the filesystem is a OK for use by in-development
* filesystem code, and ext4dev is supported or ext4 is not
if (system_supports_ext4dev() || !system_supports_ext4())
return -BLKID_ERR_PARAM;
}
+
+force_ext4:
ext_get_info(pr, 4, es);
return 0;
}
projects / util-linux / commitdiff