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md/bitmap: reduce dependence on sysfs. 

For dm-raid45 we will want to use bitmaps in dm-targets which don't
have entries in sysfs, so cope with the mddev not living in sysfs.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2010-06-01 19:37:32 +10:00
parent ac2f40be46
commit 5ff5afffe6
1 changed files with 4 additions and 3 deletions
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7
drivers/md/bitmap.c
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@ -1358,7 +1358,7 @@ void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long secto
bitmap->events_cleared < bitmap->mddev->events) { bitmap->events_cleared < bitmap->mddev->events) {
bitmap->events_cleared = bitmap->mddev->events; bitmap->events_cleared = bitmap->mddev->events;
bitmap->need_sync = 1; bitmap->need_sync = 1;
sysfs_notify_dirent(bitmap->sysfs_can_clear); sysfs_notify_dirent_safe(bitmap->sysfs_can_clear);
} }
if (!success && ! (*bmc & NEEDED_MASK)) if (!success && ! (*bmc & NEEDED_MASK))
@ -1643,7 +1643,7 @@ int bitmap_create(mddev_t *mddev)
struct file *file = mddev->bitmap_info.file; struct file *file = mddev->bitmap_info.file;
int err; int err;
sector_t start; sector_t start;
struct sysfs_dirent *bm; struct sysfs_dirent *bm = NULL;
BUILD_BUG_ON(sizeof(bitmap_super_t) != 256); BUILD_BUG_ON(sizeof(bitmap_super_t) != 256);
@ -1664,7 +1664,8 @@ int bitmap_create(mddev_t *mddev)
bitmap->mddev = mddev; bitmap->mddev = mddev;
bm = sysfs_get_dirent(mddev->kobj.sd, NULL, "bitmap"); if (mddev->kobj.sd)
bm = sysfs_get_dirent(mddev->kobj.sd, NULL, "bitmap");
if (bm) { if (bm) {
bitmap->sysfs_can_clear = sysfs_get_dirent(bm, NULL, "can_clear"); bitmap->sysfs_can_clear = sysfs_get_dirent(bm, NULL, "can_clear");
sysfs_put(bm); sysfs_put(bm);