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authorStefan Behrens <sbehrens@giantdisaster.de>2012-03-27 14:21:26 -0400
committerChris Mason <chris.mason@oracle.com>2012-03-27 14:21:26 -0400
commit94598ba8d8ff066115508fb99e593d2de1ca67e1 (patch)
tree035dcae1b60f84b5620ab1a9d42b5d1fad4b4862
parentea466794084f55d8fcc100711cf17923bf57e962 (diff)
downloadlinux-linaro-stable-94598ba8d8ff066115508fb99e593d2de1ca67e1.tar.gz
Btrfs: introduce common define for max number of mirrors
Readahead already has a define for the max number of mirrors. Scrub needs such a define now, the rest of the code will need something like this soon. Therefore the define was added to ctree.h and removed from the readahead code. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Chris Mason <chris.mason@oracle.com>
-rw-r--r--fs/btrfs/ctree.h2
-rw-r--r--fs/btrfs/reada.c10
2 files changed, 7 insertions, 5 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index c2e17cd299b7..f7da8a8d13c1 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -48,6 +48,8 @@ struct btrfs_ordered_sum;
#define BTRFS_MAGIC "_BHRfS_M"
+#define BTRFS_MAX_MIRRORS 2
+
#define BTRFS_MAX_LEVEL 8
#define BTRFS_COMPAT_EXTENT_TREE_V0
diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c
index 22db04550f6a..dc5d33146fdb 100644
--- a/fs/btrfs/reada.c
+++ b/fs/btrfs/reada.c
@@ -54,7 +54,6 @@
* than the 2 started one after another.
*/
-#define MAX_MIRRORS 2
#define MAX_IN_FLIGHT 6
struct reada_extctl {
@@ -71,7 +70,7 @@ struct reada_extent {
struct list_head extctl;
struct kref refcnt;
spinlock_t lock;
- struct reada_zone *zones[MAX_MIRRORS];
+ struct reada_zone *zones[BTRFS_MAX_MIRRORS];
int nzones;
struct btrfs_device *scheduled_for;
};
@@ -84,7 +83,8 @@ struct reada_zone {
spinlock_t lock;
int locked;
struct btrfs_device *device;
- struct btrfs_device *devs[MAX_MIRRORS]; /* full list, incl self */
+ struct btrfs_device *devs[BTRFS_MAX_MIRRORS]; /* full list, incl
+ * self */
int ndevs;
struct kref refcnt;
};
@@ -365,9 +365,9 @@ again:
if (ret || !bbio || length < blocksize)
goto error;
- if (bbio->num_stripes > MAX_MIRRORS) {
+ if (bbio->num_stripes > BTRFS_MAX_MIRRORS) {
printk(KERN_ERR "btrfs readahead: more than %d copies not "
- "supported", MAX_MIRRORS);
+ "supported", BTRFS_MAX_MIRRORS);
goto error;
}