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authorAndre Noll <maan@systemlinux.org>2009-06-18 08:49:23 +1000
committerNeilBrown <neilb@suse.de>2009-06-18 08:49:23 +1000
commit0894cc3066aaa3e75a99383c0d25feebf9b688ac (patch)
tree651664e6b288e36dc9553443e334e650139851c8
parent8190e754e0723de7cecb80bdd9eb93911dfa04a1 (diff)
downloadop-kernel-dev-0894cc3066aaa3e75a99383c0d25feebf9b688ac.zip
op-kernel-dev-0894cc3066aaa3e75a99383c0d25feebf9b688ac.tar.gz
md: Move check for bitmap presence to personality code.
If the superblock of a component device indicates the presence of a bitmap but the corresponding raid personality does not support bitmaps (raid0, linear, multipath, faulty), then something is seriously wrong and we'd better refuse to run such an array. Currently, this check is performed while the superblocks are examined, i.e. before entering personality code. Therefore the generic md layer must know which raid levels support bitmaps and which do not. This patch avoids this layer violation without adding identical code to various personalities. This is accomplished by introducing a new public function to md.c, md_check_no_bitmap(), which replaces the hard-coded checks in the superblock loading functions. A call to md_check_no_bitmap() is added to the ->run method of each personality which does not support bitmaps and assembly is aborted if at least one component device contains a bitmap. Signed-off-by: Andre Noll <maan@systemlinux.org> Signed-off-by: NeilBrown <neilb@suse.de>
-rw-r--r--drivers/md/faulty.c6
-rw-r--r--drivers/md/linear.c2
-rw-r--r--drivers/md/md.c40
-rw-r--r--drivers/md/md.h1
-rw-r--r--drivers/md/multipath.c3
-rw-r--r--drivers/md/raid0.c2
6 files changed, 31 insertions, 23 deletions
diff --git a/drivers/md/faulty.c b/drivers/md/faulty.c
index 6e83b38..87d88db 100644
--- a/drivers/md/faulty.c
+++ b/drivers/md/faulty.c
@@ -299,8 +299,12 @@ static int run(mddev_t *mddev)
{
mdk_rdev_t *rdev;
int i;
+ conf_t *conf;
- conf_t *conf = kmalloc(sizeof(*conf), GFP_KERNEL);
+ if (md_check_no_bitmap(mddev))
+ return -EINVAL;
+
+ conf = kmalloc(sizeof(*conf), GFP_KERNEL);
if (!conf)
return -ENOMEM;
diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index dda2f1b..564c390 100644
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -189,6 +189,8 @@ static int linear_run (mddev_t *mddev)
{
linear_conf_t *conf;
+ if (md_check_no_bitmap(mddev))
+ return -EINVAL;
mddev->queue->queue_lock = &mddev->queue->__queue_lock;
conf = linear_conf(mddev, mddev->raid_disks);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 0f11fd1..09be637 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -736,6 +736,24 @@ struct super_type {
};
/*
+ * Check that the given mddev has no bitmap.
+ *
+ * This function is called from the run method of all personalities that do not
+ * support bitmaps. It prints an error message and returns non-zero if mddev
+ * has a bitmap. Otherwise, it returns 0.
+ *
+ */
+int md_check_no_bitmap(mddev_t *mddev)
+{
+ if (!mddev->bitmap_file && !mddev->bitmap_offset)
+ return 0;
+ printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
+ mdname(mddev), mddev->pers->name);
+ return 1;
+}
+EXPORT_SYMBOL(md_check_no_bitmap);
+
+/*
* load_super for 0.90.0
*/
static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
@@ -788,17 +806,6 @@ static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version
rdev->data_offset = 0;
rdev->sb_size = MD_SB_BYTES;
- if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
- if (sb->level != 1 && sb->level != 4
- && sb->level != 5 && sb->level != 6
- && sb->level != 10) {
- /* FIXME use a better test */
- printk(KERN_WARNING
- "md: bitmaps not supported for this level.\n");
- goto abort;
- }
- }
-
if (sb->level == LEVEL_MULTIPATH)
rdev->desc_nr = -1;
else
@@ -1176,17 +1183,6 @@ static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
bdevname(rdev->bdev,b));
return -EINVAL;
}
- if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
- if (sb->level != cpu_to_le32(1) &&
- sb->level != cpu_to_le32(4) &&
- sb->level != cpu_to_le32(5) &&
- sb->level != cpu_to_le32(6) &&
- sb->level != cpu_to_le32(10)) {
- printk(KERN_WARNING
- "md: bitmaps not supported for this level.\n");
- return -EINVAL;
- }
- }
rdev->preferred_minor = 0xffff;
rdev->data_offset = le64_to_cpu(sb->data_offset);
diff --git a/drivers/md/md.h b/drivers/md/md.h
index ea2c441..9430a11 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -430,5 +430,6 @@ extern void md_new_event(mddev_t *mddev);
extern int md_allow_write(mddev_t *mddev);
extern void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev);
extern void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors);
+extern int md_check_no_bitmap(mddev_t *mddev);
#endif /* _MD_MD_H */
diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
index c1ca63f..cbe368f 100644
--- a/drivers/md/multipath.c
+++ b/drivers/md/multipath.c
@@ -421,6 +421,9 @@ static int multipath_run (mddev_t *mddev)
struct multipath_info *disk;
mdk_rdev_t *rdev;
+ if (md_check_no_bitmap(mddev))
+ return -EINVAL;
+
if (mddev->level != LEVEL_MULTIPATH) {
printk("multipath: %s: raid level not set to multipath IO (%d)\n",
mdname(mddev), mddev->level);
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 717e64a..ab4a489 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -314,6 +314,8 @@ static int raid0_run(mddev_t *mddev)
printk(KERN_ERR "md/raid0: chunk size must be set.\n");
return -EINVAL;
}
+ if (md_check_no_bitmap(mddev))
+ return -EINVAL;
blk_queue_max_sectors(mddev->queue, mddev->chunk_sectors);
mddev->queue->queue_lock = &mddev->queue->__queue_lock;
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