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https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
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bad6663f24
This is a wrap-up of three patches pending upstream approval. I'm bundling them because they are interdependent, and it'll be easier to drop it on rebase later. 1. dm: allow a dm-fs-style device to be shared via dm-ioctl Integrates feedback from Alisdair, Mike, and Kiyoshi. Two main changes occur here: - One function is added which allows for a programmatically created mapped device to be inserted into the dm-ioctl hash table. This binds the device to a name and, optional, uuid which is needed by udev and allows for userspace management of the mapped device. - dm_table_complete() was extended to handle all of the final functional changes required for the table to be operational once called. 2. init: boot to device-mapper targets without an initr* Add a dm= kernel parameter modeled after the md= parameter from do_mounts_md. It allows for device-mapper targets to be configured at boot time for use early in the boot process (as the root device or otherwise). It also replaces /dev/XXX calls with major:minor opportunistically. The format is dm="name uuid ro,table line 1,table line 2,...". The parser expects the comma to be safe to use as a newline substitute but, otherwise, uses the normal separator of space. Some attempt has been made to make it forgiving of additional spaces (using skip_spaces()). A mapped device created during boot will be assigned a minor of 0 and may be access via /dev/dm-0. An example dm-linear root with no uuid may look like: root=/dev/dm-0 dm="lroot none ro, 0 4096 linear /dev/ubdb 0, 4096 4096 linear /dv/ubdc 0" Once udev is started, /dev/dm-0 will become /dev/mapper/lroot. Older upstream threads: http://marc.info/?l=dm-devel&m=127429492521964&w=2 http://marc.info/?l=dm-devel&m=127429499422096&w=2 http://marc.info/?l=dm-devel&m=127429493922000&w=2 Latest upstream threads: https://patchwork.kernel.org/patch/104859/ https://patchwork.kernel.org/patch/104860/ https://patchwork.kernel.org/patch/104861/ BUG: 27175947 Signed-off-by: Will Drewry <wad@chromium.org> Review URL: http://codereview.chromium.org/2020011 Change-Id: I92bd53432a11241228d2e5ac89a3b20d19b05a31
86 lines
1.5 KiB
C
86 lines
1.5 KiB
C
#include <linux/kernel.h>
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#include <linux/blkdev.h>
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#include <linux/init.h>
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#include <linux/syscalls.h>
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#include <linux/unistd.h>
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#include <linux/slab.h>
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#include <linux/mount.h>
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#include <linux/major.h>
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#include <linux/root_dev.h>
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void change_floppy(char *fmt, ...);
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void mount_block_root(char *name, int flags);
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void mount_root(void);
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extern int root_mountflags;
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static inline int create_dev(char *name, dev_t dev)
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{
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sys_unlink(name);
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return sys_mknod(name, S_IFBLK|0600, new_encode_dev(dev));
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}
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#if BITS_PER_LONG == 32
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static inline u32 bstat(char *name)
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{
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struct stat64 stat;
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if (sys_stat64(name, &stat) != 0)
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return 0;
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if (!S_ISBLK(stat.st_mode))
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return 0;
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if (stat.st_rdev != (u32)stat.st_rdev)
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return 0;
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return stat.st_rdev;
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}
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#else
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static inline u32 bstat(char *name)
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{
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struct stat stat;
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if (sys_newstat(name, &stat) != 0)
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return 0;
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if (!S_ISBLK(stat.st_mode))
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return 0;
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return stat.st_rdev;
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}
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#endif
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#ifdef CONFIG_BLK_DEV_RAM
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int __init rd_load_disk(int n);
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int __init rd_load_image(char *from);
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#else
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static inline int rd_load_disk(int n) { return 0; }
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static inline int rd_load_image(char *from) { return 0; }
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#endif
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#ifdef CONFIG_BLK_DEV_INITRD
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int __init initrd_load(void);
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#else
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static inline int initrd_load(void) { return 0; }
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#endif
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#ifdef CONFIG_BLK_DEV_MD
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void md_run_setup(void);
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#else
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static inline void md_run_setup(void) {}
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#endif
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#ifdef CONFIG_BLK_DEV_DM
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void dm_run_setup(void);
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#else
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static inline void dm_run_setup(void) {}
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#endif
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