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YuKuai-huaweigregkh
YuKuai-huawei
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gregkh
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md: reintroduce md-linear
commit 127186c upstream. THe md-linear is removed by commit 849d18e ("md: Remove deprecated CONFIG_MD_LINEAR") because it has been marked as deprecated for a long time. However, md-linear is used widely for underlying disks with different size, sadly we didn't know this until now, and it's true useful to create partitions and assemble multiple raid and then append one to the other. People have to use dm-linear in this case now, however, they will prefer to minimize the number of involved modules. Fixes: 849d18e ("md: Remove deprecated CONFIG_MD_LINEAR") Cc: stable@vger.kernel.org Signed-off-by: Yu Kuai <yukuai3@huawei.com> Acked-by: Coly Li <colyli@kernel.org> Acked-by: Mike Snitzer <snitzer@kernel.org> Link: https://lore.kernel.org/r/20250102112841.1227111-1-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Lines changed: 379 additions & 4 deletions

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‎drivers/md/Kconfig‎

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@@ -61,6 +61,19 @@ config MD_BITMAP_FILE
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various kernel APIs and can only work with files on a file system not
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actually sitting on the MD device.
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config MD_LINEAR
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tristate "Linear (append) mode"
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depends on BLK_DEV_MD
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help
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If you say Y here, then your multiple devices driver will be able to
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use the so-called linear mode, i.e. it will combine the hard disk
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partitions by simply appending one to the other.
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To compile this as a module, choose M here: the module
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will be called linear.
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If unsure, say Y.
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config MD_RAID0
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tristate "RAID-0 (striping) mode"
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depends on BLK_DEV_MD

‎drivers/md/Makefile‎

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@@ -29,12 +29,14 @@ dm-zoned-y += dm-zoned-target.o dm-zoned-metadata.o dm-zoned-reclaim.o
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md-mod-y += md.o md-bitmap.o
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raid456-y += raid5.o raid5-cache.o raid5-ppl.o
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linear-y += md-linear.o
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# Note: link order is important. All raid personalities
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# and must come before md.o, as they each initialise
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# themselves, and md.o may use the personalities when it
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# auto-initialised.
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obj-$(CONFIG_MD_LINEAR) += linear.o
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obj-$(CONFIG_MD_RAID0) += raid0.o
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obj-$(CONFIG_MD_RAID1) += raid1.o
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obj-$(CONFIG_MD_RAID10) += raid10.o

‎drivers/md/md-autodetect.c‎

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@@ -49,6 +49,7 @@ static int md_setup_ents __initdata;
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* instead of just one. -- KTK
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* 18May2000: Added support for persistent-superblock arrays:
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* md=n,0,factor,fault,device-list uses RAID0 for device n
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* md=n,-1,factor,fault,device-list uses LINEAR for device n
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* md=n,device-list reads a RAID superblock from the devices
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* elements in device-list are read by name_to_kdev_t so can be
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* a hex number or something like /dev/hda1 /dev/sdb
@@ -87,15 +88,18 @@ static int __init md_setup(char *str)
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md_setup_ents++;
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switch (get_option(&str, &level)) { /* RAID level */
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case 2: /* could be 0 or -1.. */
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if (level == 0) {
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if (level == 0 || level == LEVEL_LINEAR) {
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if (get_option(&str, &factor) != 2 || /* Chunk Size */
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get_option(&str, &fault) != 2) {
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printk(KERN_WARNING "md: Too few arguments supplied to md=.\n");
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return 0;
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}
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md_setup_args[ent].level = level;
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md_setup_args[ent].chunk = 1 << (factor+12);
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pername = "raid0";
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if (level == LEVEL_LINEAR)
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pername = "linear";
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else
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pername = "raid0";
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break;
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}
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fallthrough;

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