[PATCH 1/2] fs: export cdev_get_linux_rootarg() for reuse

[PATCH 1/2] fs: export cdev_get_linux_rootarg() for reuse

[Ahmad Fatoum]

We've the root=PARTUUID=%s generation at two places: Once to populate
fsdev->linux_rootarg and once to handle struct bootm_data::root_dev.

In preparation for dropping the duplicate out-of-sync code in the bootm
code, export the originl fs/fs.c code as cdev_get_linux_rootarg().

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 fs/fs.c      | 50 +++++++++++++++++++++++++++++++++++---------------
 include/fs.h |  1 +
 2 files changed, 36 insertions(+), 15 deletions(-)

diff --git a/fs/fs.c b/fs/fs.c
index bd6f144742ac..620cd6597a63 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -2876,12 +2876,23 @@ int popd(char *oldcwd)
 	return ret;
 }
 
-static char *get_linux_mmcblkdev(struct fs_device_d *fsdev)
+static bool cdev_partname_equal(const struct cdev *a,
+				const struct cdev *b)
 {
-	struct cdev *cdevm, *cdev;
+	return a->partname && b->partname &&
+		!strcmp(a->partname, b->partname);
+}
+
+static char *get_linux_mmcblkdev(const struct cdev *root_cdev)
+{
+	struct cdev *cdevm = root_cdev->master, *cdev;
 	int id, partnum;
 
-	cdevm = fsdev->cdev->master;
+	if (!IS_ENABLED(CONFIG_MMCBLKDEV_ROOTARG))
+		return NULL;
+	if (!cdevm || !cdev_is_mci_main_part_dev(cdevm))
+		return NULL;
+
 	id = of_alias_get_id(cdevm->device_node, "mmc");
 	if (id < 0)
 		return NULL;
@@ -2894,8 +2905,7 @@ static char *get_linux_mmcblkdev(struct fs_device_d *fsdev)
 		 * in the partitions list so we need to count it instead of
 		 * skipping it.
 		 */
-		if (cdev->partname &&
-		    !strcmp(cdev->partname, fsdev->cdev->partname))
+		if (cdev_partname_equal(root_cdev, cdev))
 			return basprintf("root=/dev/mmcblk%dp%d", id, partnum);
 		partnum++;
 	}
@@ -2903,6 +2913,23 @@ static char *get_linux_mmcblkdev(struct fs_device_d *fsdev)
 	return NULL;
 }
 
+char *cdev_get_linux_rootarg(const struct cdev *cdev)
+{
+	char *str;
+
+	if (!cdev)
+		return NULL;
+
+	str = get_linux_mmcblkdev(cdev);
+	if (str)
+		return str;
+
+	if (cdev->uuid[0] != 0)
+		return basprintf("root=PARTUUID=%s", cdev->uuid);
+
+	return NULL;
+}
+
 /*
  * Mount a device to a directory.
  * We do this by registering a new device on which the filesystem
@@ -2991,17 +3018,10 @@ int mount(const char *device, const char *fsname, const char *pathname,
 
 	fsdev->vfsmount.mnt_root = fsdev->sb.s_root;
 
-	if (!fsdev->linux_rootarg && fsdev->cdev) {
-		char *str = NULL;
-
-		if (IS_ENABLED(CONFIG_MMCBLKDEV_ROOTARG) &&
-		    fsdev->cdev->master &&
-		    cdev_is_mci_main_part_dev(fsdev->cdev->master))
-			str = get_linux_mmcblkdev(fsdev);
-
-		if (!str && fsdev->cdev->uuid[0] != 0)
-			str = basprintf("root=PARTUUID=%s", fsdev->cdev->uuid);
+	if (!fsdev->linux_rootarg) {
+		char *str;
 
+		str = cdev_get_linux_rootarg(fsdev->cdev);
 		if (str)
 			fsdev_set_linux_rootarg(fsdev, str);
 	}
diff --git a/include/fs.h b/include/fs.h
index cd5eb571e08e..894cae3e4c2f 100644
--- a/include/fs.h
+++ b/include/fs.h
@@ -168,6 +168,7 @@ void mount_all(void);
 
 void fsdev_set_linux_rootarg(struct fs_device_d *fsdev, const char *str);
 char *path_get_linux_rootarg(const char *path);
+char *cdev_get_linux_rootarg(const struct cdev *cdev);
 
 static inline const char *devpath_to_name(const char *devpath)
 {
-- 
2.30.2

[PATCH 2/2] common: bootm: reuse cdev_get_linux_rootarg()

[Ahmad Fatoum]

CONFIG_MMCBLKDEV_ROOTARG=y so far had no effect on the root= option
generated by $global.bootm.root_dev. Have the bootm code reuse
cdev_get_linux_rootarg(), so it behaves the same as with boot from
file system.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 common/bootm.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/common/bootm.c b/common/bootm.c
index c0f7bca6ce86..2f02c156e56f 100644
--- a/common/bootm.c
+++ b/common/bootm.c
@@ -710,9 +710,8 @@ int bootm_boot(struct bootm_data *bootm_data)
 			const char *root_dev_name = devpath_to_name(bootm_data->root_dev);
 			const struct cdev *root_cdev = cdev_by_name(root_dev_name);
 
-			if (root_cdev && root_cdev->uuid[0] != 0) {
-				rootarg = basprintf("root=PARTUUID=%s", root_cdev->uuid);
-			} else {
+			rootarg = cdev_get_linux_rootarg(root_cdev);
+			if (!rootarg) {
 				rootarg = ERR_PTR(-EINVAL);
 
 				if (!root_cdev)
-- 
2.30.2

Re: [PATCH 1/2] fs: export cdev_get_linux_rootarg() for reuse

[Sascha Hauer]

On Mon, Aug 15, 2022 at 01:48:34PM +0200, Ahmad Fatoum wrote:
> We've the root=PARTUUID=%s generation at two places: Once to populate
> fsdev->linux_rootarg and once to handle struct bootm_data::root_dev.
> 
> In preparation for dropping the duplicate out-of-sync code in the bootm
> code, export the originl fs/fs.c code as cdev_get_linux_rootarg().
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
> ---
>  fs/fs.c      | 50 +++++++++++++++++++++++++++++++++++---------------
>  include/fs.h |  1 +
>  2 files changed, 36 insertions(+), 15 deletions(-)

Applied, thanks

Sascha

> 
> diff --git a/fs/fs.c b/fs/fs.c
> index bd6f144742ac..620cd6597a63 100644
> --- a/fs/fs.c
> +++ b/fs/fs.c
> @@ -2876,12 +2876,23 @@ int popd(char *oldcwd)
>  	return ret;
>  }
>  
> -static char *get_linux_mmcblkdev(struct fs_device_d *fsdev)
> +static bool cdev_partname_equal(const struct cdev *a,
> +				const struct cdev *b)
>  {
> -	struct cdev *cdevm, *cdev;
> +	return a->partname && b->partname &&
> +		!strcmp(a->partname, b->partname);
> +}
> +
> +static char *get_linux_mmcblkdev(const struct cdev *root_cdev)
> +{
> +	struct cdev *cdevm = root_cdev->master, *cdev;
>  	int id, partnum;
>  
> -	cdevm = fsdev->cdev->master;
> +	if (!IS_ENABLED(CONFIG_MMCBLKDEV_ROOTARG))
> +		return NULL;
> +	if (!cdevm || !cdev_is_mci_main_part_dev(cdevm))
> +		return NULL;
> +
>  	id = of_alias_get_id(cdevm->device_node, "mmc");
>  	if (id < 0)
>  		return NULL;
> @@ -2894,8 +2905,7 @@ static char *get_linux_mmcblkdev(struct fs_device_d *fsdev)
>  		 * in the partitions list so we need to count it instead of
>  		 * skipping it.
>  		 */
> -		if (cdev->partname &&
> -		    !strcmp(cdev->partname, fsdev->cdev->partname))
> +		if (cdev_partname_equal(root_cdev, cdev))
>  			return basprintf("root=/dev/mmcblk%dp%d", id, partnum);
>  		partnum++;
>  	}
> @@ -2903,6 +2913,23 @@ static char *get_linux_mmcblkdev(struct fs_device_d *fsdev)
>  	return NULL;
>  }
>  
> +char *cdev_get_linux_rootarg(const struct cdev *cdev)
> +{
> +	char *str;
> +
> +	if (!cdev)
> +		return NULL;
> +
> +	str = get_linux_mmcblkdev(cdev);
> +	if (str)
> +		return str;
> +
> +	if (cdev->uuid[0] != 0)
> +		return basprintf("root=PARTUUID=%s", cdev->uuid);
> +
> +	return NULL;
> +}
> +
>  /*
>   * Mount a device to a directory.
>   * We do this by registering a new device on which the filesystem
> @@ -2991,17 +3018,10 @@ int mount(const char *device, const char *fsname, const char *pathname,
>  
>  	fsdev->vfsmount.mnt_root = fsdev->sb.s_root;
>  
> -	if (!fsdev->linux_rootarg && fsdev->cdev) {
> -		char *str = NULL;
> -
> -		if (IS_ENABLED(CONFIG_MMCBLKDEV_ROOTARG) &&
> -		    fsdev->cdev->master &&
> -		    cdev_is_mci_main_part_dev(fsdev->cdev->master))
> -			str = get_linux_mmcblkdev(fsdev);
> -
> -		if (!str && fsdev->cdev->uuid[0] != 0)
> -			str = basprintf("root=PARTUUID=%s", fsdev->cdev->uuid);
> +	if (!fsdev->linux_rootarg) {
> +		char *str;
>  
> +		str = cdev_get_linux_rootarg(fsdev->cdev);
>  		if (str)
>  			fsdev_set_linux_rootarg(fsdev, str);
>  	}
> diff --git a/include/fs.h b/include/fs.h
> index cd5eb571e08e..894cae3e4c2f 100644
> --- a/include/fs.h
> +++ b/include/fs.h
> @@ -168,6 +168,7 @@ void mount_all(void);
>  
>  void fsdev_set_linux_rootarg(struct fs_device_d *fsdev, const char *str);
>  char *path_get_linux_rootarg(const char *path);
> +char *cdev_get_linux_rootarg(const struct cdev *cdev);
>  
>  static inline const char *devpath_to_name(const char *devpath)
>  {
> -- 
> 2.30.2
> 
> 
> 

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