From 292695531ae4019bb15deedc121b218d1908b648 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Mon, 27 Mar 2006 01:18:10 -0800 Subject: [PATCH] md: Final stages of raid5 expand code This patch adds raid5_reshape and end_reshape which will start and finish the reshape processes. raid5_reshape is only enabled in CONFIG_MD_RAID5_RESHAPE is set, to discourage accidental use. Read the 'help' for the CONFIG_MD_RAID5_RESHAPE entry. and Make sure that you have backups, just in case. Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/raid/md.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'include/linux/raid/md.h') diff --git a/include/linux/raid/md.h b/include/linux/raid/md.h index b6e0bcad84e..9c77cde5a79 100644 --- a/include/linux/raid/md.h +++ b/include/linux/raid/md.h @@ -92,7 +92,8 @@ extern void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, extern void md_super_wait(mddev_t *mddev); extern int sync_page_io(struct block_device *bdev, sector_t sector, int size, struct page *page, int rw); - +extern void md_do_sync(mddev_t *mddev); +extern void md_new_event(mddev_t *mddev); #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } -- cgit From f67055780caac6a99f43834795c43acf99eba6a6 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Mon, 27 Mar 2006 01:18:11 -0800 Subject: [PATCH] md: Checkpoint and allow restart of raid5 reshape We allow the superblock to record an 'old' and a 'new' geometry, and a position where any conversion is up to. The geometry allows for changing chunksize, layout and level as well as number of devices. When using verion-0.90 superblock, we convert the version to 0.91 while the conversion is happening so that an old kernel will refuse the assemble the array. For version-1, we use a feature bit for the same effect. When starting an array we check for an incomplete reshape and restart the reshape process if needed. If the reshape stopped at an awkward time (like when updating the first stripe) we refuse to assemble the array, and let user-space worry about it. Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/raid/md.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/linux/raid/md.h') diff --git a/include/linux/raid/md.h b/include/linux/raid/md.h index 9c77cde5a79..66b44e5e0d6 100644 --- a/include/linux/raid/md.h +++ b/include/linux/raid/md.h @@ -95,6 +95,8 @@ extern int sync_page_io(struct block_device *bdev, sector_t sector, int size, extern void md_do_sync(mddev_t *mddev); extern void md_new_event(mddev_t *mddev); +extern void md_update_sb(mddev_t * mddev); + #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } #endif -- cgit