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| author | Christoph Hellwig <hch@lst.de> | 2023-05-31 14:55:21 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-06-05 10:55:20 -0600 |
| commit | 07d63cbb67cdb5e2a7720fdd8579b3be979c2d66 (patch) | |
| tree | a573356aeff5a9584d93c89e7f3a8afb1b814e3f | |
| parent | 73231b58b1b496d631fa0ecf9fa7f64f5a07c6e3 (diff) | |
| download | linux-07d63cbb67cdb5e2a7720fdd8579b3be979c2d66.tar.gz linux-07d63cbb67cdb5e2a7720fdd8579b3be979c2d66.tar.bz2 linux-07d63cbb67cdb5e2a7720fdd8579b3be979c2d66.zip | |
init: handle ubi/mtd root mounting like all other root types
Assign a Root_Generic magic value for UBI/MTD root and handle the root
mounting in mount_root like all other root types. Besides making the
code more clear this also means that UBI/MTD root can be used together
with an initrd (not that anyone should care).
Also factor parsing of the root name into a helper now that it can
be easily done and will get more complicated with subsequent patches.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20230531125535.676098-11-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | include/linux/root_dev.h | 1 | ||||
| -rw-r--r-- | init/do_mounts.c | 23 |
2 files changed, 15 insertions, 9 deletions
diff --git a/include/linux/root_dev.h b/include/linux/root_dev.h index ed3ea8da6429..847c9a06101b 100644 --- a/include/linux/root_dev.h +++ b/include/linux/root_dev.h @@ -9,6 +9,7 @@ enum { Root_NFS = MKDEV(UNNAMED_MAJOR, 255), Root_CIFS = MKDEV(UNNAMED_MAJOR, 254), + Root_Generic = MKDEV(UNNAMED_MAJOR, 253), Root_RAM0 = MKDEV(RAMDISK_MAJOR, 0), }; diff --git a/init/do_mounts.c b/init/do_mounts.c index 74cc96bffbdd..be6d14733ba0 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -591,6 +591,10 @@ void __init mount_root(char *root_device_name) case Root_CIFS: mount_cifs_root(); break; + case Root_Generic: + mount_root_generic(root_device_name, root_device_name, + root_mountflags); + break; case 0: if (root_device_name && root_fs_names && mount_nodev_root(root_device_name) == 0) @@ -602,6 +606,14 @@ void __init mount_root(char *root_device_name) } } +static dev_t __init parse_root_device(char *root_device_name) +{ + if (!strncmp(root_device_name, "mtd", 3) || + !strncmp(root_device_name, "ubi", 3)) + return Root_Generic; + return name_to_dev_t(root_device_name); +} + /* * Prepare the namespace - decide what/where to mount, load ramdisks, etc. */ @@ -624,15 +636,8 @@ void __init prepare_namespace(void) md_run_setup(); - if (saved_root_name[0]) { - if (!strncmp(saved_root_name, "mtd", 3) || - !strncmp(saved_root_name, "ubi", 3)) { - mount_root_generic(saved_root_name, saved_root_name, - root_mountflags); - goto out; - } - ROOT_DEV = name_to_dev_t(saved_root_name); - } + if (saved_root_name[0]) + ROOT_DEV = parse_root_device(saved_root_name); if (initrd_load(saved_root_name)) goto out; |