systemd/detect-btrfs-ssd.patch

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commit d7228cb8529de83115af04bf653b4d204dad8fae
Author: Lennart Poettering <lennart@poettering.net>
Date: Thu Nov 22 01:51:06 2012 +0100
readahead: properly detect btrfs on SSD
diff --git a/src/readahead/readahead-common.c b/src/readahead/readahead-common.c
index 10b0ccc..41aaff0 100644
--- a/src/readahead/readahead-common.c
+++ b/src/readahead/readahead-common.c
@@ -32,6 +32,7 @@
#include "log.h"
#include "readahead-common.h"
#include "util.h"
+#include "missing.h"
int file_verify(int fd, const char *fn, off_t file_size_max, struct stat *st) {
assert(fd >= 0);
@@ -62,14 +63,63 @@ int fs_on_ssd(const char *p) {
struct udev_device *udev_device = NULL, *look_at = NULL;
bool b = false;
const char *devtype, *rotational, *model, *id;
+ int r;
assert(p);
if (stat(p, &st) < 0)
return -errno;
- if (major(st.st_dev) == 0)
+ if (major(st.st_dev) == 0) {
+ _cleanup_fclose_ FILE *f = NULL;
+ int mount_id;
+ struct file_handle *h;
+
+ /* Might be btrfs, which exposes "ssd" as mount flag if it is on ssd.
+ *
+ * We first determine the mount ID here, if we can,
+ * and then lookup the mount ID in mountinfo to find
+ * the mount options. */
+
+ h = alloca(MAX_HANDLE_SZ);
+ h->handle_bytes = MAX_HANDLE_SZ;
+ r = name_to_handle_at(AT_FDCWD, p, h, &mount_id, AT_SYMLINK_FOLLOW);
+ if (r < 0)
+ return false;
+
+ f = fopen("/proc/self/mountinfo", "re");
+ if (!f)
+ return false;
+
+ for (;;) {
+ char line[LINE_MAX], *e;
+ _cleanup_free_ char *opts = NULL;
+ int mid;
+
+ if (!fgets(line, sizeof(line), f))
+ return false;
+
+ truncate_nl(line);
+
+ if (sscanf(line, "%i", &mid) != 1)
+ continue;
+
+ if (mid != mount_id)
+ continue;
+
+ e = strstr(line, " - ");
+ if (!e)
+ continue;
+
+ if (sscanf(e+3, "%*s %*s %ms", &opts) != 1)
+ continue;
+
+ if (streq(opts, "ssd") || startswith(opts, "ssd,") || endswith(opts, ",ssd") || strstr(opts, ",ssd,"))
+ return true;
+ }
+
return false;
+ }
udev = udev_new();
if (!udev)
@@ -97,9 +147,10 @@ int fs_on_ssd(const char *p) {
/* Second, try kernel attribute */
rotational = udev_device_get_sysattr_value(look_at, "queue/rotational");
- if (rotational)
- if ((b = streq(rotational, "0")))
- goto finish;
+ if (rotational) {
+ b = streq(rotational, "0");
+ goto finish;
+ }
/* Finally, fallback to heuristics */
look_at = udev_device_get_parent(look_at);