* [PATCH] On Linux, read partition start offsets from sysfs if possible
@ 2013-12-05 12:17 Colin Watson
2013-12-05 12:22 ` Colin Watson
2013-12-05 13:45 ` Vladimir 'φ-coder/phcoder' Serbinenko
0 siblings, 2 replies; 3+ messages in thread
From: Colin Watson @ 2013-12-05 12:17 UTC (permalink / raw)
To: grub-devel
This lets us cope with block device drivers that don't implement
HDIO_GETGEO. Fixes Ubuntu bug #1237519.
* grub-core/osdep/linux/hostdisk.c (sysfs_partition_path): New
function.
(sysfs_partition_start): Likewise.
(grub_util_find_partition_start_os): Try sysfs_partition_start
before HDIO_GETGEO.
---
ChangeLog | 12 ++++++
grub-core/osdep/linux/hostdisk.c | 89 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 101 insertions(+)
diff --git a/ChangeLog b/ChangeLog
index d60acab..d08d841 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,15 @@
+2013-12-05 Colin Watson <cjwatson@ubuntu.com>
+
+ On Linux, read partition start offsets from sysfs if possible, to
+ cope with block device drivers that don't implement HDIO_GETGEO.
+ Fixes Ubuntu bug #1237519.
+
+ * grub-core/osdep/linux/hostdisk.c (sysfs_partition_path): New
+ function.
+ (sysfs_partition_start): Likewise.
+ (grub_util_find_partition_start_os): Try sysfs_partition_start
+ before HDIO_GETGEO.
+
2013-12-05 Vladimir Serbinenko <phcoder@gmail.com>
Handle unaligned .bss on sparc64.
diff --git a/grub-core/osdep/linux/hostdisk.c b/grub-core/osdep/linux/hostdisk.c
index a2c80f3..74d87a4 100644
--- a/grub-core/osdep/linux/hostdisk.c
+++ b/grub-core/osdep/linux/hostdisk.c
@@ -27,6 +27,7 @@
#include <grub/emu/misc.h>
#include <grub/emu/hostdisk.h>
#include <grub/emu/getroot.h>
+#include <grub/emu/exec.h>
#include <grub/misc.h>
#include <grub/i18n.h>
#include <grub/list.h>
@@ -39,6 +40,7 @@
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
+#include <sys/wait.h>
#include <fcntl.h>
#include <errno.h>
#include <limits.h>
@@ -93,12 +95,99 @@ grub_util_get_fd_size_os (grub_util_fd_t fd, const char *name, unsigned *log_sec
return nr;
}
+static char *
+sysfs_partition_path (const char *dev, const char *entry)
+{
+ const char *argv[7];
+ int fd;
+ pid_t pid;
+ FILE *udevadm;
+ char *buf = NULL;
+ size_t len = 0;
+ char *path = NULL;
+
+ argv[0] = "udevadm";
+ argv[1] = "info";
+ argv[2] = "--query";
+ argv[3] = "path";
+ argv[4] = "--name";
+ argv[5] = dev;
+ argv[6] = NULL;
+
+ pid = grub_util_exec_pipe (argv, &fd);
+
+ if (!pid)
+ return NULL;
+
+ /* Parent. Read udevadm's output. */
+ udevadm = fdopen (fd, "r");
+ if (!udevadm)
+ {
+ grub_util_warn (_("Unable to open stream from %s: %s"),
+ "udevadm", strerror (errno));
+ close (fd);
+ goto out;
+ }
+
+ if (getline (&buf, &len, udevadm) > 0)
+ {
+ char *newline;
+
+ newline = strchr (buf, '\n');
+ if (newline)
+ *newline = '\0';
+ path = xasprintf ("/sys%s/%s", buf, entry);
+ }
+
+out:
+ if (udevadm)
+ fclose (udevadm);
+ waitpid (pid, NULL, 0);
+ free (buf);
+
+ return path;
+}
+
+static int
+sysfs_partition_start (const char *dev, grub_disk_addr_t *start)
+{
+ char *path;
+ FILE *fp;
+ unsigned long long val;
+ int ret = 0;
+
+ path = sysfs_partition_path (dev, "start");
+ if (!path)
+ return 0;
+
+ fp = grub_util_fopen (path, "r");
+ if (!fp)
+ goto out;
+
+ if (fscanf (fp, "%llu", &val) == 1)
+ {
+ *start = (grub_disk_addr_t) val;
+ ret = 1;
+ }
+
+out:
+ free (path);
+ if (fp)
+ fclose (fp);
+
+ return ret;
+}
+
grub_disk_addr_t
grub_util_find_partition_start_os (const char *dev)
{
+ grub_disk_addr_t start;
grub_util_fd_t fd;
struct hd_geometry hdg;
+ if (sysfs_partition_start (dev, &start))
+ return start;
+
fd = open (dev, O_RDONLY);
if (fd == -1)
{
--
1.8.4.4
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH] On Linux, read partition start offsets from sysfs if possible
2013-12-05 12:17 [PATCH] On Linux, read partition start offsets from sysfs if possible Colin Watson
@ 2013-12-05 12:22 ` Colin Watson
2013-12-05 13:45 ` Vladimir 'φ-coder/phcoder' Serbinenko
1 sibling, 0 replies; 3+ messages in thread
From: Colin Watson @ 2013-12-05 12:22 UTC (permalink / raw)
To: grub-devel
On Thu, Dec 05, 2013 at 12:17:23PM +0000, Colin Watson wrote:
> This lets us cope with block device drivers that don't implement
> HDIO_GETGEO. Fixes Ubuntu bug #1237519.
Brandon Hansen also pointed out in this bug that hd_geometry.start is
unsigned long rather than unsigned long long, and thus is not
necessarily reliable on large disks, which is a good point I'd
overlooked, and should be further support for this approach.
--
Colin Watson [cjwatson@ubuntu.com]
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] On Linux, read partition start offsets from sysfs if possible
2013-12-05 12:17 [PATCH] On Linux, read partition start offsets from sysfs if possible Colin Watson
2013-12-05 12:22 ` Colin Watson
@ 2013-12-05 13:45 ` Vladimir 'φ-coder/phcoder' Serbinenko
1 sibling, 0 replies; 3+ messages in thread
From: Vladimir 'φ-coder/phcoder' Serbinenko @ 2013-12-05 13:45 UTC (permalink / raw)
To: The development of GNU GRUB
[-- Attachment #1: Type: text/plain, Size: 4064 bytes --]
Looks good. Go ahead.
On 05.12.2013 13:17, Colin Watson wrote:
> This lets us cope with block device drivers that don't implement
> HDIO_GETGEO. Fixes Ubuntu bug #1237519.
>
> * grub-core/osdep/linux/hostdisk.c (sysfs_partition_path): New
> function.
> (sysfs_partition_start): Likewise.
> (grub_util_find_partition_start_os): Try sysfs_partition_start
> before HDIO_GETGEO.
> ---
> ChangeLog | 12 ++++++
> grub-core/osdep/linux/hostdisk.c | 89 ++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 101 insertions(+)
>
> diff --git a/ChangeLog b/ChangeLog
> index d60acab..d08d841 100644
> --- a/ChangeLog
> +++ b/ChangeLog
> @@ -1,3 +1,15 @@
> +2013-12-05 Colin Watson <cjwatson@ubuntu.com>
> +
> + On Linux, read partition start offsets from sysfs if possible, to
> + cope with block device drivers that don't implement HDIO_GETGEO.
> + Fixes Ubuntu bug #1237519.
> +
> + * grub-core/osdep/linux/hostdisk.c (sysfs_partition_path): New
> + function.
> + (sysfs_partition_start): Likewise.
> + (grub_util_find_partition_start_os): Try sysfs_partition_start
> + before HDIO_GETGEO.
> +
> 2013-12-05 Vladimir Serbinenko <phcoder@gmail.com>
>
> Handle unaligned .bss on sparc64.
> diff --git a/grub-core/osdep/linux/hostdisk.c b/grub-core/osdep/linux/hostdisk.c
> index a2c80f3..74d87a4 100644
> --- a/grub-core/osdep/linux/hostdisk.c
> +++ b/grub-core/osdep/linux/hostdisk.c
> @@ -27,6 +27,7 @@
> #include <grub/emu/misc.h>
> #include <grub/emu/hostdisk.h>
> #include <grub/emu/getroot.h>
> +#include <grub/emu/exec.h>
> #include <grub/misc.h>
> #include <grub/i18n.h>
> #include <grub/list.h>
> @@ -39,6 +40,7 @@
> #include <unistd.h>
> #include <sys/types.h>
> #include <sys/stat.h>
> +#include <sys/wait.h>
> #include <fcntl.h>
> #include <errno.h>
> #include <limits.h>
> @@ -93,12 +95,99 @@ grub_util_get_fd_size_os (grub_util_fd_t fd, const char *name, unsigned *log_sec
> return nr;
> }
>
> +static char *
> +sysfs_partition_path (const char *dev, const char *entry)
> +{
> + const char *argv[7];
> + int fd;
> + pid_t pid;
> + FILE *udevadm;
> + char *buf = NULL;
> + size_t len = 0;
> + char *path = NULL;
> +
> + argv[0] = "udevadm";
> + argv[1] = "info";
> + argv[2] = "--query";
> + argv[3] = "path";
> + argv[4] = "--name";
> + argv[5] = dev;
> + argv[6] = NULL;
> +
> + pid = grub_util_exec_pipe (argv, &fd);
> +
> + if (!pid)
> + return NULL;
> +
> + /* Parent. Read udevadm's output. */
> + udevadm = fdopen (fd, "r");
> + if (!udevadm)
> + {
> + grub_util_warn (_("Unable to open stream from %s: %s"),
> + "udevadm", strerror (errno));
> + close (fd);
> + goto out;
> + }
> +
> + if (getline (&buf, &len, udevadm) > 0)
> + {
> + char *newline;
> +
> + newline = strchr (buf, '\n');
> + if (newline)
> + *newline = '\0';
> + path = xasprintf ("/sys%s/%s", buf, entry);
> + }
> +
> +out:
> + if (udevadm)
> + fclose (udevadm);
> + waitpid (pid, NULL, 0);
> + free (buf);
> +
> + return path;
> +}
> +
> +static int
> +sysfs_partition_start (const char *dev, grub_disk_addr_t *start)
> +{
> + char *path;
> + FILE *fp;
> + unsigned long long val;
> + int ret = 0;
> +
> + path = sysfs_partition_path (dev, "start");
> + if (!path)
> + return 0;
> +
> + fp = grub_util_fopen (path, "r");
> + if (!fp)
> + goto out;
> +
> + if (fscanf (fp, "%llu", &val) == 1)
> + {
> + *start = (grub_disk_addr_t) val;
> + ret = 1;
> + }
> +
> +out:
> + free (path);
> + if (fp)
> + fclose (fp);
> +
> + return ret;
> +}
> +
> grub_disk_addr_t
> grub_util_find_partition_start_os (const char *dev)
> {
> + grub_disk_addr_t start;
> grub_util_fd_t fd;
> struct hd_geometry hdg;
>
> + if (sysfs_partition_start (dev, &start))
> + return start;
> +
> fd = open (dev, O_RDONLY);
> if (fd == -1)
> {
>
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2013-12-05 12:17 [PATCH] On Linux, read partition start offsets from sysfs if possible Colin Watson
2013-12-05 12:22 ` Colin Watson
2013-12-05 13:45 ` Vladimir 'φ-coder/phcoder' Serbinenko
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